Fixed thumbnails ratio. Preparing user preference management

.gitignore

@@ -1,3 +1,5 @@
+volumes
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[codz]
@@ -214,3 +216,159 @@ __marimo__/
 
 # Streamlit
 .streamlit/secrets.toml
+
+### react ###
+.DS_*
+*.log
+logs
+**/*.backup.*
+**/*.back.*
+
+node_modules
+bower_components
+
+*.sublime*
+
+psd
+thumb
+sketch
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit

Makefile

@@ -0,0 +1,32 @@
+.PHONY: init up down restart logs clean
+
+init:
+	@echo "Creating directories and setting permissions..."
+	@mkdir -p ./volumes/watched_files ./volumes/objects
+	@chown -R 1002:1002 ./volumes/watched_files ./volumes/objects
+	@echo "✓ Directories initialized"
+
+up: init
+	@echo "Starting services..."
+	@docker-compose up -d
+	@echo "✓ Services started"
+
+down:
+	@docker-compose down
+
+restart:
+	@docker-compose restart
+
+logs:
+	@docker-compose logs -f
+
+clean: down
+	@echo "Cleaning volumes..."
+	@sudo rm -rf ./volumes
+	@echo "✓ Volumes cleaned"
+
+rebuild: clean init
+	@echo "Rebuilding images..."
+	@docker-compose build --no-cache
+	@docker-compose up -d
+	@echo "✓ Services rebuilt and started"

Readme.md

@@ -2,20 +2,24 @@
 
 ## Overview
 
-MyDocManager is a real-time document processing application that automatically detects files in a monitored directory, processes them asynchronously, and stores the results in a database. The application uses a modern microservices architecture with Redis for task queuing and MongoDB for data persistence.
+MyDocManager is a real-time document processing application that automatically detects files in a monitored directory,
+processes them asynchronously, and stores the results in a database. The application uses a modern microservices
+architecture with Redis for task queuing and MongoDB for data persistence.
 
 ## Architecture
 
 ### Technology Stack
+
 - **Backend API**: FastAPI (Python 3.12)
 - **Task Processing**: Celery with Redis broker
 - **Document Processing**: EasyOCR, PyMuPDF, python-docx, pdfplumber
-- **Database**: MongoDB
+- **Database**: MongoDB (pymongo)
 - **Frontend**: React
 - **Containerization**: Docker & Docker Compose
 - **File Monitoring**: Python watchdog library
 
 ### Services Architecture
+
     ┌─────────────────┐    ┌─────────────┐    ┌─────────────┐    ┌─────────────┐    ┌─────────────┐
     │   Frontend      │    │ file-       │    │    Redis    │    │   Worker    │    │  MongoDB    │
     │   (React)       │◄──►│ processor   │───►│  (Broker)   │◄──►│  (Celery)   │───►│ (Results)   │
@@ -24,13 +28,13 @@ MyDocManager is a real-time document processing application that automatically d
     └─────────────────┘    └─────────────┘    └─────────────┘    └─────────────┘    └─────────────┘
 
 ### Docker Services
+
 1. **file-processor**: FastAPI + real-time file monitoring + Celery task dispatch
 2. **worker**: Celery workers for document processing (OCR, text extraction)
 3. **redis**: Message broker for Celery tasks
 4. **mongodb**: Final database for processing results
 5. **frontend**: React interface for monitoring and file access
 
-
 ## Data Flow
 
 1. **File Detection**: Watchdog monitors target directory in real-time
@@ -42,11 +46,13 @@ MyDocManager is a real-time document processing application that automatically d
 ## Document Processing Capabilities
 
 ### Supported File Types
+
 - **PDF**: Direct text extraction + OCR for scanned documents
 - **Word Documents**: .docx text extraction
 - **Images**: OCR text recognition (JPG, PNG, etc.)
 
 ### Processing Libraries
+
 - **EasyOCR**: Modern OCR engine (80+ languages, deep learning-based)
 - **PyMuPDF**: PDF text extraction and manipulation
 - **python-docx**: Word document processing
@@ -55,12 +61,15 @@ MyDocManager is a real-time document processing application that automatically d
 ## Development Environment
 
 ### Container-Based Development
+
 The application is designed for container-based development with hot-reload capabilities:
+
 - Source code mounted as volumes for real-time updates
 - All services orchestrated via Docker Compose
 - Development and production parity
 
 ### Key Features
+
 - **Real-time Processing**: Immediate file detection and processing
 - **Horizontal Scaling**: Multiple workers can be added easily
 - **Fault Tolerance**: Celery provides automatic retry mechanisms
@@ -68,6 +77,7 @@ The application is designed for container-based development with hot-reload capa
 - **Hot Reload**: Development changes reflected instantly in containers
 
 ### Docker Services
+
 1. **file-processor**: FastAPI + real-time file monitoring + Celery task dispatch
 2. **worker**: Celery workers for document processing (OCR, text extraction)
 3. **redis**: Message broker for Celery tasks
@@ -85,25 +95,32 @@ MyDocManager/
 │   │   ├── requirements.txt
 │   │   ├── app/
 │   │   │   ├── main.py
-│   │   │   ├── file_watcher.py
-│   │   │   ├── celery_app.py
+│   │   │   ├── file_watcher.py             # FileWatcher class with observer thread
+│   │   │   ├── celery_app.py               # Celery Configuration 
 │   │   │   ├── config/
 │   │   │   │   ├── __init__.py
 │   │   │   │   └── settings.py              # JWT, MongoDB config
 │   │   │   ├── models/
 │   │   │   │   ├── __init__.py
 │   │   │   │   ├── user.py                  # User Pydantic models
-│   │   │   │   └── auth.py                  # Auth Pydantic models
+│   │   │   │   ├── auth.py                  # Auth Pydantic models
+│   │   │   │   ├── document.py              # Document Pydantic models
+│   │   │   │   ├── job.py                   # Job Processing Pydantic models
+│   │   │   │   └── types.py                 # PyObjectId and other useful types
 │   │   │   ├── database/
 │   │   │   │   ├── __init__.py
-│   │   │   │   ├── connection.py            # MongoDB connection
+│   │   │   │   ├── connection.py            # MongoDB connection (pymongo)
 │   │   │   │   └── repositories/
 │   │   │   │       ├── __init__.py
-│   │   │   │       └── user_repository.py   # User CRUD operations
+│   │   │   │       ├── user_repository.py      # User CRUD operations (synchronous)
+│   │   │   │       ├── document_repository.py  # Document CRUD operations (synchronous)
+│   │   │   │       └── job_repository.py       # Job CRUD operations (synchronous)
 │   │   │   ├── services/
 │   │   │   │   ├── __init__.py
-│   │   │   │   ├── auth_service.py          # JWT & password logic
-│   │   │   │   ├── user_service.py          # User business logic
+│   │   │   │   ├── auth_service.py          # JWT & password logic (synchronous)
+│   │   │   │   ├── user_service.py          # User business logic (synchronous)
+│   │   │   │   ├── document_service.py      # Document business logic (synchronous)
+│   │   │   │   ├── job_service.py           # Job processing logic (synchronous)
 │   │   │   │   └── init_service.py          # Admin creation at startup
 │   │   │   ├── api/
 │   │   │   │   ├── __init__.py
@@ -115,7 +132,7 @@ MyDocManager/
 │   │   │   └── utils/
 │   │   │       ├── __init__.py
 │   │   │       ├── security.py             # Password utilities
-│   │   │       └── exceptions.py           # Custom exceptions
+│   │   │       └── document_matching.py    # Fuzzy matching Algorithms
 │   ├── worker/
 │   │   ├── Dockerfile
 │   │   ├── requirements.txt
@@ -123,7 +140,13 @@ MyDocManager/
 │   └── frontend/
 │       ├── Dockerfile
 │       ├── package.json
+│       ├── index.html
 │       └── src/
+│           ├── assets/
+│           ├── App.css
+│           ├── App.jsx
+│           ├── main.css
+│           └── main.jsx
 ├── tests/
 │   ├── file-processor/
 │   │   ├── test_auth/
@@ -138,6 +161,7 @@ MyDocManager/
 ## Authentication & User Management
 
 ### Security Features
+
 - **JWT Authentication**: Stateless authentication with 24-hour token expiration
 - **Password Security**: bcrypt hashing with automatic salting
 - **Role-Based Access**: Admin and User roles with granular permissions
@@ -145,16 +169,19 @@ MyDocManager/
 - **Auto Admin Creation**: Default admin user created on first startup
 
 ### User Roles
+
 - **Admin**: Full access to user management (create, read, update, delete users)
 - **User**: Limited access (view own profile, access document processing features)
 
 ### Authentication Flow
+
 1. **Login**: User provides credentials → Server validates → Returns JWT token
 2. **API Access**: Client includes JWT in Authorization header
 3. **Token Validation**: Server verifies token signature and expiration
 4. **Role Check**: Server validates user permissions for requested resource
 
 ### User Management APIs
+
 ```
 POST /auth/login              # Generate JWT token
 GET  /users                   # List all users (admin only)
@@ -164,10 +191,388 @@ DELETE /users/{user_id}       # Delete user (admin only)
 GET  /users/me                # Get current user profile (authenticated users)
 ```
 
+### Useful Service URLs
 
-## Docker Commands Reference
+- **FastAPI API**: http://localhost:8000
+- **FastAPI Docs**: http://localhost:8000/docs
+- **Health Check**: http://localhost:8000/health
+- **Redis**: localhost:6379
+- **MongoDB**: localhost:27017
 
-### Initial Setup & Build
+### Testing Commands
+
+```bash
+# Test FastAPI health
+curl http://localhost:8000/health
+
+# Test Celery task dispatch
+curl -X POST http://localhost:8000/test-task \
+  -H "Content-Type: application/json" \
+  -d '{"message": "Hello from test!"}'
+
+# Monitor Celery tasks
+docker-compose logs -f worker
+```
+
+## Default Admin User
+
+On first startup, the application automatically creates a default admin user:
+
+- **Username**: `admin`
+- **Password**: `admin`
+- **Role**: `admin`
+- **Email**: `admin@mydocmanager.local`
+  **⚠️ Important**: Change the default admin password immediately after first login in production environments.
+
+## File Processing Architecture
+
+### Document Processing Flow
+
+1. **File Detection**: Watchdog monitors `/volumes/watched_files/` directory in real-time
+2. **Task Creation**: File watcher creates Celery task for each detected file
+3. **Document Processing**: Celery worker processes the document and extracts content
+4. **Database Storage**: Processed data stored in MongoDB collections
+
+### MongoDB Collections Design
+
+#### Files Collection
+
+Stores file metadata and extracted content using Pydantic models:
+
+```python
+class FileDocument(BaseModel):
+  """
+  Model for file documents stored in the 'files' collection.
+
+  Represents a file detected in the watched directory with its
+  metadata and extracted content.
+  """
+  
+  id: Optional[PyObjectId] = Field(default=None, alias="_id")
+  filename: str = Field(..., description="Original filename")
+  filepath: str = Field(..., description="Full path to the file")
+  file_type: FileType = Field(..., description="Type of the file")
+  extraction_method: Optional[ExtractionMethod] = Field(default=None, description="Method used to extract content")
+  metadata: Dict[str, Any] = Field(default_factory=dict, description="File-specific metadata")
+  detected_at: Optional[datetime] = Field(default=None, description="Timestamp when file was detected")
+  file_hash: Optional[str] = Field(default=None, description="SHA256 hash of file content")
+  encoding: str = Field(default="utf-8", description="Character encoding for text files")
+  file_size: int = Field(..., ge=0, description="File size in bytes")
+  mime_type: str = Field(..., description="MIME type detected")
+  
+  @field_validator('filepath')
+  @classmethod
+  def validate_filepath(cls, v: str) -> str:
+    """Validate filepath format."""
+    if not v.strip():
+      raise ValueError("Filepath cannot be empty")
+    return v.strip()
+  
+  @field_validator('filename')
+  @classmethod
+  def validate_filename(cls, v: str) -> str:
+    """Validate filename format."""
+    if not v.strip():
+      raise ValueError("Filename cannot be empty")
+    return v.strip()
+```
+
+#### Processing Jobs Collection
+
+Tracks processing status and lifecycle:
+
+```python
+class ProcessingJob(BaseModel):
+  """
+  Model for processing jobs stored in the 'processing_jobs' collection.
+
+  Tracks the lifecycle and status of document processing tasks.
+  """
+  
+  id: Optional[PyObjectId] = Field(default=None, alias="_id")
+  file_id: PyObjectId = Field(..., description="Reference to file document")
+  status: ProcessingStatus = Field(default=ProcessingStatus.PENDING, description="Current processing status")
+  task_id: Optional[str] = Field(default=None, description="Celery task UUID")
+  created_at: Optional[datetime] = Field(default=None, description="Timestamp when job was created")
+  started_at: Optional[datetime] = Field(default=None, description="Timestamp when processing started")
+  completed_at: Optional[datetime] = Field(default=None, description="Timestamp when processing completed")
+  error_message: Optional[str] = Field(default=None, description="Error message if processing failed")
+  
+  @field_validator('error_message')
+  @classmethod
+  def validate_error_message(cls, v: Optional[str]) -> Optional[str]:
+    """Clean up error message."""
+    if v is not None:
+      return v.strip() if v.strip() else None
+    return v
+```
+
+### Supported File Types (Initial Implementation)
+
+- **Text Files** (`.txt`): Direct content reading
+- **PDF Documents** (`.pdf`): Text extraction via PyMuPDF/pdfplumber
+- **Word Documents** (`.docx`): Content extraction via python-docx
+
+### File Processing Architecture Decisions
+
+#### Watchdog Implementation
+
+- **Choice**: Dedicated observer thread
+- **Rationale**: Standard approach, clean separation of concerns
+- **Implementation**: Watchdog observer runs in separate thread from FastAPI
+
+#### Task Dispatch Strategy
+
+- **Choice**: Direct Celery task creation from file watcher
+- **Rationale**: Minimal latency, straightforward flow
+- **Implementation**: File detected → Immediate Celery task dispatch
+
+#### Data Storage Strategy
+
+- **Choice**: Separate collections for files and processing status
+- **Rationale**: Clean separation of file data vs processing lifecycle
+- **Benefits**:
+    - Better query performance
+    - Clear data model boundaries
+    - Easy processing status tracking
+
+#### Content Storage Location
+
+- **Choice**: Store files in the file system, using the SHA256 hash as filename
+- **Rationale**: MongoDB is not meant for large files, better performance. Files remain in the file system for easy
+  access.
+
+#### Repository and Services Implementation
+
+- **Choice**: Synchronous implementation using pymongo
+- **Rationale**: Full compatibility with Celery workers and simplified workflow
+- **Implementation**: All repositories and services operate synchronously for seamless integration
+
+
+## Job Management Layer
+
+### Repository Pattern Implementation
+
+The job management system follows the repository pattern for clean separation between data access and business logic.
+
+#### JobRepository
+
+Handles direct MongoDB operations for processing jobs using synchronous pymongo:
+
+**CRUD Operations:**
+- `create_job()` - Create new processing job with automatic `created_at` timestamp
+- `get_job_by_id()` - Retrieve job by ObjectId
+- `update_job_status()` - Update job status with automatic timestamp management
+- `delete_job()` - Remove job from database
+- `get_jobs_by_file_id()` - Get all jobs for specific file
+- `get_jobs_by_status()` - Get jobs filtered by processing status
+
+**Automatic Timestamp Management:**
+- `created_at`: Set automatically during job creation
+- `started_at`: Set automatically when status changes to PROCESSING  
+- `completed_at`: Set automatically when status changes to COMPLETED or FAILED
+
+#### JobService
+
+Provides synchronous business logic layer with strict status transition validation:
+
+**Status Transition Methods:**
+- `mark_job_as_started()` - PENDING → PROCESSING
+- `mark_job_as_completed()` - PROCESSING → COMPLETED
+- `mark_job_as_failed()` - PROCESSING → FAILED
+
+**Validation Rules:**
+- Strict status transitions (invalid transitions raise exceptions)
+- Job existence verification before any operation
+- Automatic timestamp management through repository layer
+
+#### Custom Exceptions
+
+**InvalidStatusTransitionError**: Raised for invalid status transitions  
+**JobRepositoryError**: Raised for MongoDB operation failures
+
+#### Valid Status Transitions
+
+```
+PENDING → PROCESSING    (via mark_job_as_started)
+PROCESSING → COMPLETED  (via mark_job_as_completed)
+PROCESSING → FAILED     (via mark_job_as_failed)
+```
+
+All other transitions are forbidden and will raise `InvalidStatusTransitionError`.
+
+### File Structure
+
+```
+src/file-processor/app/
+├── database/repositories/
+│   ├── job_repository.py           # JobRepository class (synchronous)
+│   ├── user_repository.py          # UserRepository class (synchronous)
+│   ├── document_repository.py      # DocumentRepository class (synchronous)
+│   └── file_repository.py          # FileRepository class (synchronous)
+├── services/  
+│   ├── job_service.py              # JobService class (synchronous)
+│   ├── auth_service.py             # AuthService class (synchronous)
+│   ├── user_service.py             # UserService class (synchronous)
+│   └── document_service.py         # DocumentService class (synchronous)
+└── exceptions/
+    └── job_exceptions.py           # Custom exceptions
+```
+
+### Processing Pipeline Features
+
+- **Duplicate Detection**: SHA256 hashing prevents reprocessing same files
+- **Error Handling**: Failed processing tracked with error messages
+- **Status Tracking**: Real-time processing status via `processing_jobs` collection
+- **Extensible Metadata**: Flexible metadata storage per file type
+- **Multiple Extraction Methods**: Support for direct text, OCR, and hybrid approaches
+- **Synchronous Operations**: All database operations use pymongo for Celery compatibility
+
+## Key Implementation Notes
+
+### Python Standards
+
+- **Style**: PEP 8 compliance
+- **Documentation**: Google/NumPy docstring format
+- **Naming**: snake_case for variables and functions
+- **Testing**: pytest with test_i_can_xxx / test_i_cannot_xxx patterns
+
+### Security Best Practices
+
+- **Password Storage**: Never store plain text passwords, always use bcrypt hashing
+- **JWT Secrets**: Use strong, randomly generated secret keys in production
+- **Token Expiration**: 24-hour expiration with secure signature validation
+- **Role Validation**: Server-side role checking for all protected endpoints
+
+### Dependencies Management
+
+- **Package Manager**: pip (standard)
+- **External Dependencies**: Listed in each service's requirements.txt
+- **Standard Library First**: Prefer standard library when possible
+- **Database Driver**: pymongo for synchronous MongoDB operations
+
+### Testing Strategy
+
+- All code must be testable
+- Unit tests for each authentication and user management function
+- Integration tests for complete authentication flow
+- Tests validated before implementation
+
+### Critical Architecture Decisions Made
+
+1. **JWT Authentication**: Simple token-based auth with 24-hour expiration
+2. **Role-Based Access**: Admin/User roles for granular permissions
+3. **bcrypt Password Hashing**: Industry-standard password security
+4. **MongoDB User Storage**: Centralized user management in main database
+5. **Auto Admin Creation**: Automatic setup for first-time deployment
+6. **Single FastAPI Service**: Handles both API and file watching with authentication
+7. **Celery with Redis**: Chosen over other async patterns for scalability
+8. **EasyOCR Preferred**: Selected over Tesseract for modern OCR needs
+9. **Container Development**: Hot-reload setup required for development workflow
+10. **Dedicated Watchdog Observer**: Thread-based file monitoring for reliability
+11. **Separate MongoDB Collections**: Files and processing jobs stored separately
+12. **Content in Files Collection**: Extracted content stored with file metadata
+13. **Direct Task Dispatch**: File watcher directly creates Celery tasks
+14. **SHA256 Duplicate Detection**: Prevents reprocessing identical files
+15. **Synchronous Implementation**: All repositories and services use pymongo for Celery compatibility
+
+### Development Process Requirements
+
+1. **Collaborative Validation**: All options must be explained before coding
+2. **Test-First Approach**: Test cases defined and validated before implementation
+3. **Incremental Development**: Start simple, extend functionality progressively
+4. **Error Handling**: Clear problem explanation required before proposing fixes
+
+### Next Implementation Steps
+
+1. Build React Login Page
+2. Build React Registration Page
+3. Build React Default Dashboard
+4. Build React User Management Pages
+
+#### Validated Folders and files
+```
+src/frontend/src/
+├── components/
+│   ├── auth/
+│   │   ├── LoginForm.jsx          # Composant formulaire de login => Done
+│   │   └── AuthLayout.jsx         # Layout pour les pages d'auth => Done
+│   └── common/
+│       ├── Header.jsx             # Header commun => TODO
+│       ├── Layout.jsx             # Header commun => TODO
+│       └── ProtectedRoutes.jsx    #  Done
+├── contexts/
+│   └── AuthContext.jsx            # Done
+├── pages/
+│   ├── LoginPage.jsx              # Page complète de login => Done
+│   └── DashboardPage.jsx          # Page tableau de bord (exemple) => TODO
+├── services/
+│   └── authService.js             # Service API pour auth => Done
+├── hooks/
+│   └── useAuth.js                 # Hook React pour gestion auth => TODO
+├── utils/
+│   └── api.js                     # Configuration axios/fetch => Done
+├── App.jsx                        # Needs to be updated => TODO
+```
+#### Choices already made
+* Pour la gestion des requêtes API et de l'état d'authentification, je propose
+    * axios (plus de fonctionnalités) :
+    * Installation d'axios pour les requêtes HTTP
+    * Intercepteurs pour gestion automatique du token
+    * Gestion d'erreurs centralisée
+* Pour la gestion de l'état d'authentification et la navigation : Option A + C en même temps
+  * Option A - Context React + React Router :
+    * React Context pour l'état global d'auth (user, token, isAuthenticated)
+    * React Router pour la navigation entre pages
+    * Routes protégées automatiques
+  * Option C - Context + localStorage pour persistance :
+    * Token sauvegardé en localStorage pour rester connecté
+    * Context qui se recharge au démarrage de l'app
+* CSS : Utilisation de daisyUI
+
+#### Package.json
+```
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@tailwindcss/vite": "^4.1.13",
+    "axios": "^1.12.2",
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1",
+    "react-router-dom": "^7.9.3"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.33.0",
+    "@types/react": "^19.1.10",
+    "@types/react-dom": "^19.1.7",
+    "@vitejs/plugin-react": "^5.0.0",
+    "autoprefixer": "^10.4.21",
+    "daisyui": "^5.1.23",
+    "eslint": "^9.33.0",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "eslint-plugin-react-refresh": "^0.4.20",
+    "globals": "^16.3.0",
+    "postcss": "^8.5.6",
+    "tailwindcss": "^4.1.13",
+    "vite": "^7.1.2"
+  }
+}
+```
+
+## Annexes
+
+### Docker Commands Reference
+
+#### Initial Setup & Build
 
 ```bash
 # Build and start all services (first time)
@@ -181,7 +586,7 @@ docker-compose build file-processor
 docker-compose build worker
 ```
 
-### Development Workflow
+#### Development Workflow
 
 ```bash
 # Start all services
@@ -203,7 +608,7 @@ docker-compose restart redis
 docker-compose restart mongodb
 ```
 
-### Monitoring & Debugging
+#### Monitoring & Debugging
 
 ```bash
 # View logs of all services
@@ -228,7 +633,7 @@ docker-compose exec worker bash
 docker-compose exec mongodb mongosh
 ```
 
-### Service Management
+#### Service Management
 
 ```bash
 # Start only specific services
@@ -248,103 +653,6 @@ docker-compose up --scale worker=3
 ### Hot-Reload Configuration
 
 - **file-processor**: Hot-reload enabled via `--reload` flag
-  - Code changes in `src/file-processor/app/` automatically restart FastAPI
+    - Code changes in `src/file-processor/app/` automatically restart FastAPI
 - **worker**: No hot-reload (manual restart required for stability)
-  - Code changes in `src/worker/tasks/` require: `docker-compose restart worker`
-
-### Useful Service URLs
-
-- **FastAPI API**: http://localhost:8000
-- **FastAPI Docs**: http://localhost:8000/docs
-- **Health Check**: http://localhost:8000/health
-- **Redis**: localhost:6379
-- **MongoDB**: localhost:27017
-
-### Testing Commands
-
-```bash
-# Test FastAPI health
-curl http://localhost:8000/health
-
-# Test Celery task dispatch
-curl -X POST http://localhost:8000/test-task \
-  -H "Content-Type: application/json" \
-  -d '{"message": "Hello from test!"}'
-
-# Monitor Celery tasks
-docker-compose logs -f worker
-```
-## Default Admin User
-
-On first startup, the application automatically creates a default admin user:
-- **Username**: `admin`
-- **Password**: `admin`
-- **Role**: `admin`
-- **Email**: `admin@mydocmanager.local`
-**⚠️ Important**: Change the default admin password immediately after first login in production environments.
-
-## Key Implementation Notes
-
-### Python Standards
-- **Style**: PEP 8 compliance
-- **Documentation**: Google/NumPy docstring format
-- **Naming**: snake_case for variables and functions
-- **Testing**: pytest with test_i_can_xxx / test_i_cannot_xxx patterns
-
-### Security Best Practices
-- **Password Storage**: Never store plain text passwords, always use bcrypt hashing
-- **JWT Secrets**: Use strong, randomly generated secret keys in production
-- **Token Expiration**: 24-hour expiration with secure signature validation
-- **Role Validation**: Server-side role checking for all protected endpoints
-
-### Dependencies Management
-- **Package Manager**: pip (standard)
-- **External Dependencies**: Listed in each service's requirements.txt
-- **Standard Library First**: Prefer standard library when possible
-
-### Testing Strategy
-- All code must be testable
-- Unit tests for each authentication and user management function
-- Integration tests for complete authentication flow
-- Tests validated before implementation
-
-### Critical Architecture Decisions Made
-1. **JWT Authentication**: Simple token-based auth with 24-hour expiration
-2. **Role-Based Access**: Admin/User roles for granular permissions
-3. **bcrypt Password Hashing**: Industry-standard password security
-4. **MongoDB User Storage**: Centralized user management in main database
-5. **Auto Admin Creation**: Automatic setup for first-time deployment
-6. **Single FastAPI Service**: Handles both API and file watching with authentication
-7. **Celery with Redis**: Chosen over other async patterns for scalability
-8. **EasyOCR Preferred**: Selected over Tesseract for modern OCR needs
-9. **Container Development**: Hot-reload setup required for development workflow
-
-### Development Process Requirements
-1. **Collaborative Validation**: All options must be explained before coding
-2. **Test-First Approach**: Test cases defined and validated before implementation
-3. **Incremental Development**: Start simple, extend functionality progressively
-4. **Error Handling**: Clear problem explanation required before proposing fixes
-
-### Next Implementation Steps
-1. ✅ Create docker-compose.yml with all services
-2. ✅ Define user management and authentication architecture
-3. Implement user models and authentication services
-4. Create protected API routes for user management
-5. Add automatic admin user creation
-6. Implement basic FastAPI service structure
-7. Add watchdog file monitoring
-8. Create Celery task structure
-9. Implement document processing tasks
-10. Build React monitoring interface with authentication
-
-### prochaines étapes
-MongoDB CRUD
-Nous devons absolument mocker MongoDB pour les tests unitaires avec pytest-mock
-Fichiers à créer: 
-* app/models/auht.py => déjà fait
-* app/models/user.py => déjà fait
-* app/database/connection.py
-  * Utilise les settings pour l'URL MongoDB. Il faut créer un fichier de configuration (app/config/settings.py)
-  * Fonction get_database() + gestion des erreurs
-  * Configuration via variables d'environnement
-* app/database/repositories/user_repository.py
+    - Code changes in `src/worker/tasks/` require: `docker-compose restart worker`

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   # Redis - Message broker for Celery
   redis:
@@ -21,7 +19,7 @@ services:
       MONGO_INITDB_ROOT_PASSWORD: password123
       MONGO_INITDB_DATABASE: mydocmanager
     volumes:
-      - mongodb-data:/data/db
+      - ./volumes/db:/data/db
     networks:
       - mydocmanager-network
 
@@ -36,15 +34,20 @@ services:
     environment:
       - REDIS_URL=redis://redis:6379/0
       - MONGODB_URL=mongodb://admin:password123@mongodb:27017/mydocmanager?authSource=admin
+      - PYTHONPATH=/app:/tasks  # Added /tasks to Python path
     volumes:
-      - ./src/file-processor/app:/app
+      - ./src/file-processor:/app
+      - ./src/worker/tasks:/app/tasks          # <- Added: shared access to worker tasks
       - ./volumes/watched_files:/watched_files
+      - ./volumes/objects:/objects
+      - ./volumes/errors:/errors
+      - ./volumes/ignored:/ignored
     depends_on:
       - redis
       - mongodb
     networks:
       - mydocmanager-network
-    command: uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
 
   # Worker - Celery workers for document processing
   worker:
@@ -55,15 +58,34 @@ services:
     environment:
       - REDIS_URL=redis://redis:6379/0
       - MONGODB_URL=mongodb://admin:password123@mongodb:27017/mydocmanager?authSource=admin
+      - PYTHONPATH=/app
     volumes:
-      - ./src/worker/tasks:/app
+      - ./src/worker:/app
+      - ./src/file-processor/app:/app/app     # <- Added: shared access file-processor app
       - ./volumes/watched_files:/watched_files
+      - ./volumes/objects:/objects
+      - ./volumes/errors:/errors
+      - ./volumes/ignored:/ignored
     depends_on:
       - redis
       - mongodb
     networks:
       - mydocmanager-network
-    command: celery -A main worker --loglevel=info
+    command: celery -A tasks.main worker --loglevel=info
+
+  # Frontend - React application with Vite
+  frontend:
+    build:
+      context: ./src/frontend
+      dockerfile: Dockerfile
+    container_name: mydocmanager-frontend
+    ports:
+      - "5173:5173"
+    volumes:
+      - ./src/frontend:/app
+      - /app/node_modules  # Anonymous volume to prevent node_modules override
+    networks:
+      - mydocmanager-network
 
 volumes:
   mongodb-data:

package-lock.json

@@ -0,0 +1,31 @@
+{
+  "name": "MyDocManager",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "react-icons": "^5.5.0"
+      }
+    },
+    "node_modules/react": {
+      "version": "19.1.1",
+      "resolved": "https://registry.npmjs.org/react/-/react-19.1.1.tgz",
+      "integrity": "sha512-w8nqGImo45dmMIfljjMwOGtbmC/mk4CMYhWIicdSflH91J9TyCyczcPFXJzrZ/ZXcgGRFeP6BU0BEJTw6tZdfQ==",
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/react-icons": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/react-icons/-/react-icons-5.5.0.tgz",
+      "integrity": "sha512-MEFcXdkP3dLo8uumGI5xN3lDFNsRtrjbOEKDLD7yv76v4wpnEq2Lt2qeHaQOr34I/wPN3s3+N08WkQ+CW37Xiw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "*"
+      }
+    }
+  }
+}

package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "react-icons": "^5.5.0"
+  }
+}

pytest.ini

@@ -0,0 +1,7 @@
+[tool:pytest]
+asyncio_mode = auto
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+pythonpath = src/file-processor

requirements.txt

@@ -1,33 +1,67 @@
 amqp==5.3.1
 annotated-types==0.7.0
 anyio==4.10.0
+asgiref==3.9.1
 bcrypt==4.3.0
 billiard==4.2.1
-bson==0.5.10
 celery==5.5.3
+certifi==2025.8.3
+cffi==2.0.0
+charset-normalizer==3.4.3
 click==8.2.1
 click-didyoumean==0.3.1
 click-plugins==1.1.1.2
 click-repl==0.3.0
+cryptography==46.0.1
+Deprecated==1.2.18
 dnspython==2.8.0
+ecdsa==0.19.1
 email-validator==2.3.0
 fastapi==0.116.1
 h11==0.16.0
+hiredis==3.2.1
+httpcore==1.0.9
 httptools==0.6.4
+httpx==0.28.1
 idna==3.10
+importlib_metadata==8.7.0
 iniconfig==2.1.0
+izulu==0.50.0
 kombu==5.5.4
+lxml==6.0.2
+mongomock==4.3.0
+mongomock-motor==0.0.36
+motor==3.7.1
 packaging==25.0
+pikepdf==9.11.0
+pillow==11.3.0
+pipdeptree==2.28.0
 pluggy==1.6.0
 prompt_toolkit==3.0.52
+pyasn1==0.6.1
+pycparser==2.23
+pycron==3.2.0
 pydantic==2.11.9
 pydantic_core==2.33.2
 Pygments==2.19.2
-pymongo==4.15.0
+PyJWT==2.10.1
+pymongo==4.15.1
+PyMuPDF==1.26.4
+pypandoc==1.15
 pytest==8.4.2
+pytest-asyncio==1.2.0
+pytest-mock==3.15.1
 python-dateutil==2.9.0.post0
+python-docx==1.2.0
 python-dotenv==1.1.1
+python-magic==0.4.27
+python-multipart==0.0.20
+pytz==2025.2
 PyYAML==6.0.2
+redis==6.4.0
+reportlab==4.4.4
+rsa==4.9.1
+sentinels==1.1.1
 six==1.17.0
 sniffio==1.3.1
 starlette==0.47.3
@@ -37,6 +71,9 @@ tzdata==2025.2
 uvicorn==0.35.0
 uvloop==0.21.0
 vine==5.1.0
+watchdog==6.0.0
 watchfiles==1.1.0
 wcwidth==0.2.13
 websockets==15.0.1
+wrapt==1.17.3
+zipp==3.23.0

src/file-processor/Dockerfile

@@ -3,15 +3,31 @@ FROM python:3.12-slim
 # Set working directory
 WORKDIR /app
 
+# Install libmagic
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libmagic1 \
+    file \
+    pandoc \
+    ghostscript \
+    texlive-xetex \
+ && rm -rf /var/lib/apt/lists/*
+
+
 # Copy requirements and install dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Change the user
+USER 1002:1002
+
 # Copy application code
-COPY app/ .
+COPY . .
+
+ENV PYTHONPATH=/app
 
 # Expose port
 EXPOSE 8000
 
+
 # Command will be overridden by docker-compose
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

src/file-processor/app/api/dependencies.py

@@ -0,0 +1,107 @@
+import jwt
+from fastapi import Depends, HTTPException
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from jwt import InvalidTokenError
+from starlette import status
+
+from app.config import settings
+from app.database.connection import get_database
+from app.models.auth import UserRole
+from app.models.user import UserInDB
+from app.services.auth_service import AuthService
+from app.services.document_service import DocumentService
+from app.services.user_service import UserService
+
+security = HTTPBearer()
+
+
+def get_auth_service() -> AuthService:
+  """Dependency to get AuthService instance."""
+  return AuthService()
+
+
+def get_user_service() -> UserService:
+  """Dependency to get UserService instance."""
+  database = get_database()
+  return UserService(database)
+
+
+def get_document_service() -> DocumentService:
+  """Dependency to get DocumentService instance."""
+  database = get_database()
+  return DocumentService(database)
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    user_service: UserService = Depends(get_user_service)
+) -> UserInDB:
+  """
+  Dependency to get current authenticated user from JWT token.
+
+  Args:
+      credentials: HTTP Bearer credentials
+      user_service: Auth service instance
+
+  Returns:
+      User: Current authenticated user
+
+  Raises:
+      HTTPException: If token is invalid or user not found
+  """
+  try:
+    payload = jwt.decode(
+      credentials.credentials,
+      settings.get_jwt_secret_key(),
+      algorithms=[settings.get_jwt_algorithm()]
+    )
+    username: str = payload.get("sub")
+    if username is None:
+      raise HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+      )
+  except InvalidTokenError:
+    raise HTTPException(
+      status_code=status.HTTP_401_UNAUTHORIZED,
+      detail="Could not validate credentials",
+      headers={"WWW-Authenticate": "Bearer"},
+    )
+  
+  user = user_service.get_user_by_username(username)
+  if user is None:
+    raise HTTPException(
+      status_code=status.HTTP_401_UNAUTHORIZED,
+      detail="Could not validate credentials",
+      headers={"WWW-Authenticate": "Bearer"},
+    )
+  
+  if not user.is_active:
+    raise HTTPException(
+      status_code=status.HTTP_400_BAD_REQUEST,
+      detail="Inactive user"
+    )
+  
+  return user
+
+
+def get_admin_user(current_user: UserInDB = Depends(get_current_user)) -> UserInDB:
+  """
+  Dependency to ensure current user has admin role.
+
+  Args:
+      current_user: Current authenticated user
+
+  Returns:
+      User: Current user if admin
+
+  Raises:
+      HTTPException: If user is not admin
+  """
+  if current_user.role != UserRole.ADMIN:
+    raise HTTPException(
+      status_code=status.HTTP_403_FORBIDDEN,
+      detail="Not enough permissions"
+    )
+  return current_user

src/file-processor/app/api/routes/auth.py

@@ -0,0 +1,80 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+
+from app.api.dependencies import get_auth_service, get_current_user, get_user_service
+from app.models.auth import LoginResponse, UserResponse
+from app.models.user import UserInDB
+from app.services.auth_service import AuthService
+from app.services.user_service import UserService
+
+router = APIRouter(tags=["authentication"])
+
+
+@router.post("/login", response_model=LoginResponse)
+def login(
+    form_data: OAuth2PasswordRequestForm = Depends(),
+    auth_service: AuthService = Depends(get_auth_service),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  Authenticate user and return JWT token.
+
+  Args:
+      form_data: OAuth2 password form data
+      auth_service: Auth service instance
+      user_service: User service instance
+
+  Returns:
+      LoginResponse: JWT token and user info
+
+  Raises:
+      HTTPException: If authentication fails
+  """
+  incorrect_username_or_pwd = HTTPException(
+    status_code=status.HTTP_401_UNAUTHORIZED,
+    detail="Incorrect username or password",
+    headers={"WWW-Authenticate": "Bearer"},
+  )
+  
+  user = user_service.get_user_by_username(form_data.username)
+  if (not user or
+      not user.is_active or
+      not auth_service.verify_user_password(form_data.password, user.hashed_password)):
+    raise incorrect_username_or_pwd
+  
+  access_token = auth_service.create_access_token(data={"sub": user.username})
+  
+  return LoginResponse(
+    access_token=access_token,
+    user=UserResponse(
+      _id=user.id,
+      username=user.username,
+      email=user.email,
+      role=user.role,
+      is_active=user.is_active,
+      created_at=user.created_at,
+      updated_at=user.updated_at
+    )
+  )
+
+
+@router.get("/me", response_model=UserResponse)
+def get_current_user_profile(current_user: UserInDB = Depends(get_current_user)):
+  """
+  Get current user profile.
+
+  Args:
+      current_user: Current authenticated user
+
+  Returns:
+      UserResponse: Current user profile without sensitive data
+  """
+  return UserResponse(
+    _id=current_user.id,
+    username=current_user.username,
+    email=current_user.email,
+    role=current_user.role,
+    is_active=current_user.is_active,
+    created_at=current_user.created_at,
+    updated_at=current_user.updated_at
+  )

src/file-processor/app/api/routes/document.py

@@ -0,0 +1,243 @@
+"""
+Document API routes.
+
+This module provides REST endpoints for document management operations.
+"""
+
+import logging
+import os
+from typing import List, Optional
+
+import fitz  # PyMuPDF
+from fastapi import APIRouter, Depends, HTTPException, Query, status, Path
+from starlette.responses import Response
+
+from app.api.dependencies import get_document_service, get_current_user
+from app.models.document import DocumentResponse, FileDocument
+from app.models.user import UserInDB
+from app.services.document_service import DocumentService
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(tags=["Documents"])
+
+
+def _count_pdf_pages(pdf_file_path: str) -> int:
+  """
+  Count the number of pages in a PDF file using PyMuPDF.
+
+  Args:
+      pdf_file_path: Path to the PDF file
+
+  Returns:
+      Number of pages in the PDF, or 0 if file cannot be read
+  """
+  try:
+    with fitz.open(pdf_file_path) as doc:
+      return doc.page_count
+  except Exception as e:
+    logger.warning(f"Could not count pages for PDF {pdf_file_path}: {e}")
+    return 0
+
+
+def _build_object_url(file_hash: Optional[str]) -> Optional[str]:
+  """
+  Build object URL from file hash.
+
+  Args:
+      file_hash: SHA256 hash of the file
+
+  Returns:
+      URL string or None if hash is not provided
+  """
+  if not file_hash:
+    return None
+  return f"/api/objects/{file_hash}"
+
+
+def _extract_metadata_field(metadata: dict, field_name: str) -> List[str]:
+  """
+  Extract a list field from metadata dictionary.
+
+  Args:
+      metadata: Document metadata dictionary
+      field_name: Name of the field to extract
+
+  Returns:
+      List of strings, empty list if field doesn't exist or is not a list
+  """
+  field_value = metadata.get(field_name, [])
+  if isinstance(field_value, list):
+    return [str(item) for item in field_value]
+  return []
+
+
+def _map_file_document_to_response(
+    document: FileDocument,
+    document_service: DocumentService
+) -> DocumentResponse:
+  """
+  Map FileDocument to DocumentResponse format.
+
+  Args:
+      document: FileDocument instance from database
+      document_service: Document service for file operations
+
+  Returns:
+      DocumentResponse instance ready for API response
+  """
+  # Calculate page count for PDF files
+  page_count = 0
+  if document.pdf_file_hash and document_service.exists(document.pdf_file_hash):
+    pdf_path = document_service.get_document_path(document.pdf_file_hash)
+    page_count = _count_pdf_pages(pdf_path)
+  
+  # Build URLs
+  thumbnail_url = _build_object_url(document.thumbnail_file_hash)
+  pdf_url = _build_object_url(document.pdf_file_hash)
+  
+  # Extract tags and categories from metadata
+  tags = _extract_metadata_field(document.metadata, "tags")
+  categories = _extract_metadata_field(document.metadata, "categories")
+  
+  # Format created_at timestamp
+  created_at = document.detected_at.isoformat() if document.detected_at else ""
+  
+  as_dict = {
+      "id": str(document.id),
+      "name": document.filename,
+      "original_file_type": document.file_type.value.upper(),
+      "created_at": created_at,
+      "file_size": document.file_size,
+      "page_count": page_count,
+      "thumbnail_url": thumbnail_url,
+      "pdf_url": pdf_url,
+      "tags": tags,
+      "categories": categories
+  }
+  logger.info(f"Document: {as_dict}")
+  
+  return DocumentResponse(**as_dict)
+
+
+@router.get("/documents", response_model=List[DocumentResponse])
+def list_documents(
+    skip: int = Query(0, ge=0, description="Number of documents to skip"),
+    limit: int = Query(100, ge=1, le=1000, description="Maximum number of documents to return"),
+    user: UserInDB = Depends(get_current_user),
+    document_service: DocumentService = Depends(get_document_service)
+) -> List[DocumentResponse]:
+  """
+  Retrieve a paginated list of documents.
+
+  Args:
+      skip: Number of documents to skip for pagination
+      limit: Maximum number of documents to return
+      document_service: Document service instance
+
+  Returns:
+      List of documents in API response format
+
+  Raises:
+      HTTPException: If database operation fails
+  """
+  try:
+    # Get documents from service
+    documents = document_service.list_documents(skip=skip, limit=limit)
+    
+    # Map to response format
+    document_responses = [
+        _map_file_document_to_response(doc, document_service)
+        for doc in documents
+    ]
+    
+    return document_responses
+  
+  except Exception as e:
+    logger.error(f"Failed to list documents: {e}")
+    raise HTTPException(
+      status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+      detail="Failed to retrieve documents"
+    )
+
+
+@router.get("/objects/{file_hash}")
+async def get_object_by_hash(
+    file_hash: str = Path(..., description="SHA256 hash of the object to retrieve"),
+    document_service: DocumentService = Depends(get_document_service),
+    user: UserInDB = Depends(get_current_user),
+):
+  """
+  Serve object content by its hash.
+
+  This endpoint serves files (original documents, PDFs, thumbnails) by their
+  SHA256 hash. It supports all file types stored in the objects folder.
+
+  Args:
+      file_hash: SHA256 hash of the object
+      document_service: Document service dependency
+
+  Returns:
+      FileResponse with the requested object content
+
+  Raises:
+      HTTPException: If object not found (404) or server error (500)
+  """
+  try:
+    # Check if object exists
+    if not document_service.exists(file_hash):
+      raise HTTPException(
+        status_code=status.HTTP_404_NOT_FOUND,
+        detail="Object not found"
+      )
+    
+    # Get file path
+    file_path = document_service.get_document_path(file_hash)
+    
+    # Verify file exists on disk
+    if not os.path.exists(file_path):
+      logger.error(f"Object {file_hash} registered but file not found at {file_path}")
+      raise HTTPException(
+        status_code=status.HTTP_404_NOT_FOUND,
+        detail="Object file not found on disk"
+      )
+    
+    # Determine media type based on file content
+    try:
+      file_content = document_service.get_document_content_by_hash(file_hash)
+      if not file_content:
+        raise HTTPException(
+          status_code=status.HTTP_404_NOT_FOUND,
+          detail="Object content not available"
+        )
+      
+      # Detect MIME type
+      import magic
+      mime_type = magic.from_buffer(file_content, mime=True)
+      
+      # Return file content with appropriate headers
+      return Response(
+        content=file_content,
+        media_type=mime_type,
+        headers={
+            "Content-Length": str(len(file_content)),
+            "Cache-Control": "public, max-age=3600"  # Cache for 1 hour
+        }
+      )
+    
+    except Exception as e:
+      logger.error(f"Error reading object content for hash {file_hash}: {str(e)}")
+      raise HTTPException(
+        status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+        detail="Failed to read object content"
+      )
+  
+  except HTTPException:
+    # Re-raise HTTP exceptions as-is
+    raise
+  except Exception as e:
+    logger.error(f"Unexpected error serving object {file_hash}: {str(e)}")
+    raise HTTPException(
+      status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+      detail="Internal server error while serving object"
+    )

src/file-processor/app/api/routes/users.py

@@ -0,0 +1,172 @@
+from fastapi import APIRouter, Depends, HTTPException
+from starlette import status
+
+from app.api.dependencies import get_admin_user, get_user_service
+from app.models.auth import UserResponse, MessageResponse
+from app.models.types import PyObjectId
+from app.models.user import UserInDB, UserCreate, UserUpdate
+from app.services.user_service import UserService
+
+router = APIRouter(tags=["users"])
+
+
+@router.get("", response_model=list[UserInDB])
+def list_users(
+    admin_user: UserInDB = Depends(get_admin_user),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  List all users (admin only).
+
+  Args:
+      admin_user: Current admin user
+      user_service: User service instance
+
+  Returns:
+      List[UserResponse]: List of all users without sensitive data
+  """
+  return user_service.list_users()
+
+
+@router.get("/{user_id}", response_model=UserResponse)
+def get_user_by_id(
+    user_id: PyObjectId,
+    admin_user: UserInDB = Depends(get_admin_user),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  Get specific user by ID (admin only).
+
+  Args:
+      user_id: User ID to retrieve
+      admin_user: Current admin user
+      user_service: User service instance
+
+  Returns:
+      UserResponse: User information without sensitive data
+
+  Raises:
+      HTTPException: If user not found
+  """
+  user = user_service.get_user_by_id(str(user_id))
+  if not user:
+    raise HTTPException(
+      status_code=status.HTTP_404_NOT_FOUND,
+      detail="User not found"
+    )
+  
+  return user
+
+
+@router.post("", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
+def create_user(
+    user_data: UserCreate,
+    admin_user: UserInDB = Depends(get_admin_user),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  Create new user (admin only).
+
+  Args:
+      user_data: User creation data
+      admin_user: Current admin user
+      user_service: User service instance
+
+  Returns:
+      UserResponse: Created user information without sensitive data
+
+  Raises:
+      HTTPException: If user creation fails
+  """
+  try:
+    user = user_service.create_user(user_data)
+    return UserResponse(
+      _id=user.id,
+      username=user.username,
+      email=user.email,
+      role=user.role,
+      is_active=user.is_active,
+      created_at=user.created_at,
+      updated_at=user.updated_at
+    )
+  except ValueError as e:
+    raise HTTPException(
+      status_code=status.HTTP_400_BAD_REQUEST,
+      detail=str(e)
+    )
+
+
+@router.put("/{user_id}", response_model=UserResponse)
+def update_user(
+    user_id: PyObjectId,
+    user_data: UserUpdate,
+    admin_user: UserInDB = Depends(get_admin_user),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  Update existing user (admin only).
+
+  Args:
+      user_id: User ID to update
+      user_data: User update data
+      admin_user: Current admin user
+      user_service: User service instance
+
+  Returns:
+      UserResponse: Updated user information without sensitive data
+
+  Raises:
+      HTTPException: If user not found or update fails
+  """
+  try:
+    user = user_service.update_user(str(user_id), user_data)
+    if not user:
+      raise HTTPException(
+        status_code=status.HTTP_404_NOT_FOUND,
+        detail="User not found"
+      )
+    
+    return UserResponse(
+      _id=user.id,
+      username=user.username,
+      email=user.email,
+      role=user.role,
+      is_active=user.is_active,
+      created_at=user.created_at,
+      updated_at=user.updated_at
+    )
+  except ValueError as e:
+    raise HTTPException(
+      status_code=status.HTTP_400_BAD_REQUEST,
+      detail=str(e)
+    )
+
+
+@router.delete("/{user_id}", response_model=MessageResponse)
+def delete_user(
+    user_id: PyObjectId,
+    admin_user: UserInDB = Depends(get_admin_user),
+    user_service: UserService = Depends(get_user_service)
+):
+  """
+  Delete user by ID (admin only).
+
+  Args:
+      user_id: User ID to delete
+      admin_user: Current admin user
+      user_service: User service instance
+
+  Returns:
+      MessageResponse: Success message
+
+  Raises:
+      HTTPException: If user not found or deletion fails
+  """
+  success = user_service.delete_user(str(user_id))
+  if not success:
+    raise HTTPException(
+      status_code=status.HTTP_404_NOT_FOUND,
+      detail="User not found"
+    )
+  
+  return MessageResponse(message="User successfully deleted")

src/file-processor/app/config/settings.py

@@ -6,7 +6,6 @@ using simple os.getenv() approach without external validation libraries.
 """
 
 import os
-from typing import Optional
 
 
 def get_mongodb_url() -> str:
@@ -31,6 +30,10 @@ def get_mongodb_database_name() -> str:
   return os.getenv("MONGODB_DATABASE", "mydocmanager")
 
 
+def get_redis_url() -> str:
+  return os.getenv("REDIS_URL", "redis://localhost:6379/0")
+
+
 def get_jwt_secret_key() -> str:
   """
   Get JWT secret key from environment variables.
@@ -83,3 +86,33 @@ def is_development_environment() -> bool:
       bool: True if development environment
   """
   return os.getenv("ENVIRONMENT", "development").lower() == "development"
+
+
+def get_objects_folder() -> str:
+  """
+  Get Vault path from environment variables.
+
+  Returns:
+      str: Vault path
+  """
+  return os.getenv("OBJECTS_FOLDER", "/objects")
+
+
+def get_watch_folder() -> str:
+  """Directory to monitor for new files"""
+  return os.getenv("WATCH_DIRECTORY", "/watched_files")
+
+
+def get_temp_folder() -> str:
+  """Directory to store temporary files"""
+  return os.getenv("TEMP_DIRECTORY", "/tmp")
+
+
+def get_errors_folder() -> str:
+  """Directory to store temporary files"""
+  return os.getenv("ERRORS_DIRECTORY", "/errors")
+
+
+def get_ignored_folder() -> str:
+  """Directory to store temporary files"""
+  return os.getenv("IGNORED_DIRECTORY", "/ignored")

src/file-processor/app/database/connection.py

@@ -4,19 +4,23 @@ MongoDB database connection management.
 This module handles MongoDB connection with fail-fast approach.
 The application will terminate if MongoDB is not accessible at startup.
 """
-
+import logging
 import sys
 from typing import Optional
+
 from pymongo import MongoClient
 from pymongo.database import Database
 from pymongo.errors import ConnectionFailure, ServerSelectionTimeoutError
 
-from ..config.settings import get_mongodb_url, get_mongodb_database_name
+from app.config.settings import get_mongodb_url, get_mongodb_database_name
+from app.utils.security import safe_connection_string
 
 # Global variables for singleton pattern
 _client: Optional[MongoClient] = None
 _database: Optional[Database] = None
 
+logger = logging.getLogger(__name__)
+
 
 def create_mongodb_client() -> MongoClient:
   """
@@ -42,16 +46,16 @@ def create_mongodb_client() -> MongoClient:
     # Test connection by running admin command
     client.admin.command('ping')
     
-    print(f"Successfully connected to MongoDB at {mongodb_url}")
+    logger.info(f"Successfully connected to MongoDB at {safe_connection_string(mongodb_url)}")
     return client
   
   except (ConnectionFailure, ServerSelectionTimeoutError) as e:
-    print(f"ERROR: Failed to connect to MongoDB at {mongodb_url}")
-    print(f"Connection error: {str(e)}")
-    print("MongoDB is required for this application. Please ensure MongoDB is running and accessible.")
+    logger.error(f"ERROR: Failed to connect to MongoDB at {safe_connection_string(mongodb_url)}")
+    logger.error(f"Connection error: {str(e)}")
+    logger.error("MongoDB is required for this application. Please ensure MongoDB is running and accessible.")
     sys.exit(1)
   except Exception as e:
-    print(f"ERROR: Unexpected error connecting to MongoDB: {str(e)}")
+    logger.error(f"ERROR: Unexpected error connecting to MongoDB: {str(e)}")
     sys.exit(1)
 
 
@@ -73,7 +77,7 @@ def get_database() -> Database:
     
     database_name = get_mongodb_database_name()
     _database = _client[database_name]
-    print(f"Connected to database: {database_name}")
+    logger.info(f"Connected to database: {database_name}")
   
   return _database
 
@@ -91,7 +95,7 @@ def close_database_connection():
     _client.close()
     _client = None
     _database = None
-    print("MongoDB connection closed")
+    logger.info("MongoDB connection closed")
 
 
 def get_mongodb_client() -> Optional[MongoClient]:
@@ -107,6 +111,15 @@ def get_mongodb_client() -> Optional[MongoClient]:
   return _client
 
 
+def get_extra_args(session):
+  # Build kwargs only if session is provided
+  kwargs = {}
+  if session is not None:
+    kwargs["session"] = session
+  
+  return kwargs
+
+
 def test_database_connection() -> bool:
   """
   Test if database connection is working.

src/file-processor/app/database/repositories/document_repository.py

@@ -0,0 +1,302 @@
+"""
+File repository for database operations on FileDocument collection.
+
+This module provides data access operations for file documents stored
+in MongoDB with proper error handling and type safety.
+"""
+
+from typing import Optional, List
+
+from bson import ObjectId
+from pymongo.collection import Collection
+from pymongo.database import Database
+from pymongo.errors import DuplicateKeyError, PyMongoError
+
+from app.database.connection import get_extra_args
+from app.models.document import FileDocument
+from app.utils.document_matching import fuzzy_matching, subsequence_matching
+
+
+class MatchMethodBase:
+  pass
+
+
+class SubsequenceMatching(MatchMethodBase):
+  pass
+
+
+class FuzzyMatching(MatchMethodBase):
+  def __init__(self, threshold: float = 0.6):
+    self.threshold = threshold
+
+
+class FileDocumentRepository:
+  """
+  Repository class for file document database operations.
+  
+  This class handles all database operations for FileDocument objects
+  with proper error handling and data validation.
+  """
+  
+  def __init__(self, database: Database):
+    """Initialize file repository with database connection."""
+    self.db = database
+    self.collection: Collection = self.db.documents
+  
+  def initialize(self):
+    """
+    Initialize repository by ensuring required indexes exist.
+
+    Should be called after repository instantiation to setup database indexes.
+    """
+    self._ensure_indexes()
+    return self
+  
+  def _ensure_indexes(self):
+    """
+    Ensure required database indexes exist.
+
+    Creates unique index on username field to prevent duplicates.
+    """
+    pass
+  
+  def create_document(self, file_data: FileDocument, session=None) -> FileDocument:
+    """
+    Create a new file document in database.
+    
+    Args:
+        file_data (FileDocument): File document data to create
+        session (AsyncIOMotorClientSession, optional): MongoDB session
+        
+    Returns:
+        FileDocument: Created document with database ID
+        
+    Raises:
+        ValueError: If file creation fails due to validation
+        DuplicateKeyError: If a document with same hash already exists
+    """
+    try:
+      file_dict = file_data.model_dump(by_alias=True, exclude_unset=True)
+      if "_id" in file_dict and file_dict["_id"] is None:
+        del file_dict["_id"]
+      
+      result = self.collection.insert_one(file_dict, **get_extra_args(session))
+      file_data.id = result.inserted_id
+      return file_data
+    
+    except DuplicateKeyError as e:
+      raise DuplicateKeyError(f"File with same file path already exists: {e}")
+    except PyMongoError as e:
+      raise ValueError(f"Failed to create file document: {e}")
+  
+  def find_document_by_id(self, file_id: str) -> Optional[FileDocument]:
+    """
+    Find file document by ID.
+    
+    Args:
+        file_id (str): File document ID to search for
+        
+    Returns:
+        FileDocument or None: File document if found, None otherwise
+    """
+    try:
+      if not ObjectId.is_valid(file_id):
+        return None
+      
+      file_doc = self.collection.find_one({"_id": ObjectId(file_id)})
+      if file_doc:
+        return FileDocument(**file_doc)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def find_document_by_hash(self, file_hash: str) -> Optional[FileDocument]:
+    """
+    Find file document by file hash to detect duplicates.
+    
+    Args:
+        file_hash (str): SHA256 hash of file content
+        
+    Returns:
+        FileDocument or None: File document if found, None otherwise
+    """
+    try:
+      file_doc = self.collection.find_one({"file_hash": file_hash})
+      if file_doc:
+        return FileDocument(**file_doc)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def find_document_with_pdf_hash(self, file_hash: str) -> Optional[FileDocument]:
+    """
+    Find file document by file hash with a pdf_file_hash set (not None).
+
+    Args:
+        file_hash (str): SHA256 hash of file content
+
+    Returns:
+        FileDocument or None: File document if found, None otherwise
+    """
+    try:
+      file_doc = self.collection.find_one({"file_hash": file_hash,
+                                           "pdf_file_hash": {"$ne": None}})
+      if file_doc:
+        return FileDocument(**file_doc)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def find_same_document(self, filename: str, file_hash: str):
+    """
+    Find document with the same file_name and the same file hash
+
+    Args:
+        filename (str):
+        file_hash (str): SHA256 hash of file content
+
+    Returns:
+        FileDocument or None: File document if found, None otherwise
+    """
+    try:
+      file_doc = self.collection.find_one({"file_hash": file_hash,
+                                           "filename": filename})
+      if file_doc:
+        return FileDocument(**file_doc)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def find_document_by_filepath(self, filepath: str) -> Optional[FileDocument]:
+    """
+    Find file document by exact filepath.
+    
+    Args:
+        filepath (str): Full path to the file
+        
+    Returns:
+        FileDocument or None: File document if found, None otherwise
+    """
+    try:
+      file_doc = self.collection.find_one({"filepath": filepath})
+      if file_doc:
+        return FileDocument(**file_doc)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def find_document_by_name(self, filename: str, matching_method: MatchMethodBase = None) -> List[FileDocument]:
+    """
+    Find file documents by filename using fuzzy matching.
+    
+    Args:
+        filename (str): Filename to search for
+        matching_method (MatchMethodBase): Minimum similarity ratio (0.0 to 1.0)
+        
+    Returns:
+        List[FileDocument]: List of matching files sorted by similarity score
+    """
+    try:
+      # Get all files from database
+      cursor = self.collection.find({})
+      all_documents = [FileDocument(**file_doc) for file_doc in cursor]
+      
+      if isinstance(matching_method, FuzzyMatching):
+        return fuzzy_matching(filename, all_documents, matching_method.threshold)
+      
+      return subsequence_matching(filename, all_documents)
+    
+    except PyMongoError:
+      return []
+  
+  def list_documents(self, skip: int = 0, limit: int = 100) -> List[FileDocument]:
+    """
+    List file documents with pagination.
+    
+    Args:
+        skip (int): Number of documents to skip (default: 0)
+        limit (int): Maximum number of documents to return (default: 100)
+        
+    Returns:
+        List[FileDocument]: List of file documents
+    """
+    try:
+      cursor = self.collection.find({}).skip(skip).limit(limit).sort("detected_at", -1)
+      return [FileDocument(**doc) for doc in cursor]
+    
+    except PyMongoError:
+      return []
+  
+  def count_documents(self) -> int:
+    """
+    Count total number of file documents.
+    
+    Returns:
+        int: Total number of file documents in collection
+    """
+    try:
+      return self.collection.count_documents({})
+    except PyMongoError:
+      return 0
+  
+  def update_document(self, file_id: str, update_data: dict, session=None) -> Optional[FileDocument]:
+    """
+    Update file document with new data.
+    
+    Args:
+        file_id (str): File document ID to update
+        update_data (dict): Fields to update
+        session (AsyncIOMotorClientSession, optional): MongoDB session
+        
+    Returns:
+        FileDocument or None: Updated file document if successful, None otherwise
+    """
+    try:
+      if not ObjectId.is_valid(file_id):
+        return None
+      
+      # Remove None values from update data
+      clean_update_data = {k: v for k, v in update_data.items() if v is not None}
+      
+      if not clean_update_data:
+        return self.find_document_by_id(file_id)
+      
+      result = self.collection.find_one_and_update(
+        {"_id": ObjectId(file_id)},
+        {"$set": clean_update_data},
+        return_document=True,
+        **get_extra_args(session)
+      )
+      
+      if result:
+        return FileDocument(**result)
+      return None
+    
+    except PyMongoError:
+      return None
+  
+  def delete_document(self, file_id: str, session=None) -> bool:
+    """
+    Delete file document from database.
+    
+    Args:
+        file_id (str): File document ID to delete
+        session (AsyncIOMotorClientSession, optional): MongoDB session
+        
+    Returns:
+        bool: True if file was deleted, False otherwise
+    """
+    try:
+      if not ObjectId.is_valid(file_id):
+        return False
+      
+      result = self.collection.delete_one({"_id": ObjectId(file_id)}, **get_extra_args(session))
+      return result.deleted_count > 0
+    
+    except PyMongoError:
+      return False

src/file-processor/app/database/repositories/job_repository.py

@@ -0,0 +1,230 @@
+"""
+Repository for managing processing jobs in MongoDB.
+
+This module provides data access layer for ProcessingJob operations
+with automatic timestamp management and error handling.
+"""
+
+from datetime import datetime
+from typing import List, Optional
+
+from pymongo.collection import Collection
+from pymongo.database import Database
+from pymongo.errors import PyMongoError
+
+from app.exceptions.job_exceptions import JobRepositoryError
+from app.models.job import ProcessingJob, ProcessingStatus
+from app.models.types import PyObjectId
+
+
+class JobRepository:
+  """
+  Repository for processing job data access operations.
+
+  Provides CRUD operations for ProcessingJob documents with automatic
+  timestamp management and proper error handling.
+  """
+  
+  def __init__(self, database: Database):
+    """Initialize repository with MongoDB collection reference."""
+    self.db = database
+    self.collection: Collection = self.db.processing_jobs
+  
+  def _ensure_indexes(self):
+    """
+    Ensure required database indexes exist.
+
+    Creates unique index on username field to prevent duplicates.
+    """
+    try:
+      self.collection.create_index("document_id", unique=True)
+    except PyMongoError:
+      # Index might already exist, ignore error
+      pass
+  
+  def initialize(self):
+    """
+    Initialize repository by ensuring required indexes exist.
+
+    Should be called after repository instantiation to setup database indexes.
+    """
+    self._ensure_indexes()
+    return self
+  
+  def create_job(self, document_id: PyObjectId, task_id: Optional[str] = None) -> ProcessingJob:
+    """
+    Create a new processing job.
+
+    Args:
+        file_id: Reference to the file document
+        task_id: Optional Celery task UUID
+
+    Returns:
+        The created ProcessingJob
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      job_data = {
+          "document_id": document_id,
+          "status": ProcessingStatus.PENDING,
+          "task_id": task_id,
+          "created_at": datetime.now(),
+          "started_at": None,
+          "completed_at": None,
+          "error_message": None
+      }
+      
+      result = self.collection.insert_one(job_data)
+      job_data["_id"] = result.inserted_id
+      
+      return ProcessingJob(**job_data)
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("create_job", e)
+  
+  def find_job_by_id(self, job_id: PyObjectId) -> Optional[ProcessingJob]:
+    """
+    Retrieve a job by its ID.
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        The ProcessingJob document
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      job_data = self.collection.find_one({"_id": job_id})
+      if job_data:
+        return ProcessingJob(**job_data)
+      
+      return None
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("get_job_by_id", e)
+  
+  def update_job_status(
+      self,
+      job_id: PyObjectId,
+      status: ProcessingStatus,
+      error_message: Optional[str] = None
+  ) -> Optional[ProcessingJob]:
+    """
+    Update job status with automatic timestamp management.
+
+    Args:
+        job_id: The job ObjectId
+        status: New processing status
+        error_message: Optional error message for failed jobs
+
+    Returns:
+        The updated ProcessingJob
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      # Prepare update data
+      update_data = {"status": status}
+      
+      # Set appropriate timestamp based on status
+      current_time = datetime.now()
+      if status == ProcessingStatus.PROCESSING:
+        update_data["started_at"] = current_time
+      elif status in (ProcessingStatus.COMPLETED, ProcessingStatus.FAILED):
+        update_data["completed_at"] = current_time
+      
+      # Add error message if provided
+      if error_message is not None:
+        update_data["error_message"] = error_message
+      
+      result = self.collection.find_one_and_update(
+        {"_id": job_id},
+        {"$set": update_data},
+        return_document=True
+      )
+      
+      if result:
+        return ProcessingJob(**result)
+      
+      return None
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("update_job_status", e)
+  
+  def delete_job(self, job_id: PyObjectId) -> bool:
+    """
+    Delete a job from the database.
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        True if job was deleted, False if not found
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      result = self.collection.delete_one({"_id": job_id})
+      
+      return result.deleted_count > 0
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("delete_job", e)
+  
+  def find_jobs_by_document_id(self, document_id: PyObjectId) -> List[ProcessingJob]:
+    """
+    Retrieve all jobs for a specific file.
+
+    Args:
+        document_id: The file ObjectId
+
+    Returns:
+        List of ProcessingJob documents
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      cursor = self.collection.find({"document_id": document_id})
+      
+      jobs = []
+      for job_data in cursor:
+        jobs.append(ProcessingJob(**job_data))
+      
+      return jobs
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("get_jobs_by_file_id", e)
+  
+  def get_jobs_by_status(self, status: ProcessingStatus) -> List[ProcessingJob]:
+    """
+    Retrieve all jobs with a specific status.
+
+    Args:
+        status: The processing status to filter by
+
+    Returns:
+        List of ProcessingJob documents
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    try:
+      cursor = self.collection.find({"status": status})
+      
+      jobs = []
+      for job_data in cursor:
+        jobs.append(ProcessingJob(**job_data))
+      
+      return jobs
+    
+    except PyMongoError as e:
+      raise JobRepositoryError("get_jobs_by_status", e)

src/file-processor/app/database/repositories/user_repository.py

@@ -2,17 +2,19 @@
 User repository for MongoDB operations.
 
 This module implements the repository pattern for user CRUD operations
-with dependency injection of the database connection.
+with dependency injection of the database connection using async/await.
 """
 
-from typing import Optional, List, Dict, Any
 from datetime import datetime
+from typing import Optional, List
+
 from bson import ObjectId
-from pymongo.database import Database
-from pymongo.errors import DuplicateKeyError
 from pymongo.collection import Collection
+from pymongo.database import Database
+from pymongo.errors import DuplicateKeyError, PyMongoError
 
 from app.models.user import UserCreate, UserInDB, UserUpdate
+from app.utils.security import hash_password
 
 
 class UserRepository:
@@ -20,7 +22,7 @@ class UserRepository:
   Repository class for user CRUD operations in MongoDB.
 
   This class handles all database operations related to users,
-  following the repository pattern with dependency injection.
+  following the repository pattern with dependency injection and async/await.
   """
   
   def __init__(self, database: Database):
@@ -28,13 +30,19 @@ class UserRepository:
     Initialize repository with database dependency.
 
     Args:
-        database (Database): MongoDB database instance
+        database (AsyncIOMotorDatabase): MongoDB database instance
     """
     self.db = database
     self.collection: Collection = database.users
   
-    # Create unique index on username for duplicate prevention
+  def initialize(self):
+    """
+    Initialize repository by ensuring required indexes exist.
+
+    Should be called after repository instantiation to setup database indexes.
+    """
     self._ensure_indexes()
+    return self
   
   def _ensure_indexes(self):
     """
@@ -44,7 +52,7 @@ class UserRepository:
     """
     try:
       self.collection.create_index("username", unique=True)
-    except Exception:
+    except PyMongoError:
       # Index might already exist, ignore error
       pass
   
@@ -60,23 +68,26 @@ class UserRepository:
 
     Raises:
         DuplicateKeyError: If username already exists
+        ValueError: If user creation fails due to validation
     """
     user_dict = {
         "username": user_data.username,
         "email": user_data.email,
-        "hashed_password": user_data.hashed_password,
+        "hashed_password": hash_password(user_data.password),
         "role": user_data.role,
-        "is_active": user_data.is_active,
-        "created_at": datetime.utcnow(),
-        "updated_at": datetime.utcnow()
+        "is_active": True,
+        "created_at": datetime.now(),
+        "updated_at": datetime.now()
     }
     
     try:
       result = self.collection.insert_one(user_dict)
       user_dict["_id"] = result.inserted_id
       return UserInDB(**user_dict)
-    except DuplicateKeyError:
-      raise DuplicateKeyError(f"User with username '{user_data.username}' already exists")
+    except DuplicateKeyError as e:
+      raise DuplicateKeyError(f"User with username '{user_data.username}' already exists: {e}")
+    except PyMongoError as e:
+      raise ValueError(f"Failed to create user: {e}")
   
   def find_user_by_username(self, username: str) -> Optional[UserInDB]:
     """
@@ -88,10 +99,13 @@ class UserRepository:
     Returns:
         UserInDB or None: User if found, None otherwise
     """
-    user_doc = self.collection.find_one({"username": username})
-    if user_doc:
-      return UserInDB(**user_doc)
-    return None
+    try:
+      user_doc = self.collection.find_one({"username": username})
+      if user_doc:
+        return UserInDB(**user_doc)
+      return None
+    except PyMongoError:
+      return None
   
   def find_user_by_id(self, user_id: str) -> Optional[UserInDB]:
     """
@@ -104,14 +118,15 @@ class UserRepository:
         UserInDB or None: User if found, None otherwise
     """
     try:
-      object_id = ObjectId(user_id)
-      user_doc = self.collection.find_one({"_id": object_id})
+      if not ObjectId.is_valid(user_id):
+        return None
+      
+      user_doc = self.collection.find_one({"_id": ObjectId(user_id)})
       if user_doc:
         return UserInDB(**user_doc)
-    except Exception:
-      # Invalid ObjectId format
-      pass
-    return None
+      return None
+    except PyMongoError:
+      return None
   
   def find_user_by_email(self, email: str) -> Optional[UserInDB]:
     """
@@ -123,10 +138,13 @@ class UserRepository:
     Returns:
         UserInDB or None: User if found, None otherwise
     """
-    user_doc = self.collection.find_one({"email": email})
-    if user_doc:
-      return UserInDB(**user_doc)
-    return None
+    try:
+      user_doc = self.collection.find_one({"email": email})
+      if user_doc:
+        return UserInDB(**user_doc)
+      return None
+    except PyMongoError:
+      return None
   
   def update_user(self, user_id: str, user_update: UserUpdate) -> Optional[UserInDB]:
     """
@@ -140,32 +158,43 @@ class UserRepository:
         UserInDB or None: Updated user if found, None otherwise
     """
     try:
-      object_id = ObjectId(user_id)
+      if not ObjectId.is_valid(user_id):
+        return None
       
       # Build update document with only provided fields
-      update_data = {"updated_at": datetime.utcnow()}
+      update_data = {"updated_at": datetime.now()}
       
+      if user_update.username is not None:
+        update_data["username"] = user_update.username
       if user_update.email is not None:
         update_data["email"] = user_update.email
-      if user_update.hashed_password is not None:
-        update_data["hashed_password"] = user_update.hashed_password
+      if user_update.password is not None:
+        update_data["hashed_password"] = hash_password(user_update.password)
       if user_update.role is not None:
         update_data["role"] = user_update.role
       if user_update.is_active is not None:
         update_data["is_active"] = user_update.is_active
+      if user_update.preferences is not None:
+        update_data["preferences"] = user_update.preferences
       
-      result = self.collection.update_one(
-        {"_id": object_id},
-        {"$set": update_data}
-      )
+      # Remove None values from update data
+      clean_update_data = {k: v for k, v in update_data.items() if v is not None}
       
-      if result.matched_count > 0:
+      if not clean_update_data:
         return self.find_user_by_id(user_id)
       
-    except Exception:
-      # Invalid ObjectId format or other errors
-      pass
-    return None
+      result = self.collection.find_one_and_update(
+        {"_id": ObjectId(user_id)},
+        {"$set": clean_update_data},
+        return_document=True
+      )
+      
+      if result:
+        return UserInDB(**result)
+      return None
+    
+    except PyMongoError:
+      return None
   
   def delete_user(self, user_id: str) -> bool:
     """
@@ -178,11 +207,12 @@ class UserRepository:
         bool: True if user was deleted, False otherwise
     """
     try:
-      object_id = ObjectId(user_id)
-      result = self.collection.delete_one({"_id": object_id})
+      if not ObjectId.is_valid(user_id):
+        return False
+      
+      result = self.collection.delete_one({"_id": ObjectId(user_id)})
       return result.deleted_count > 0
-    except Exception:
-      # Invalid ObjectId format
+    except PyMongoError:
       return False
   
   def list_users(self, skip: int = 0, limit: int = 100) -> List[UserInDB]:
@@ -196,8 +226,12 @@ class UserRepository:
     Returns:
         List[UserInDB]: List of users
     """
-    cursor = self.collection.find().skip(skip).limit(limit)
-    return [UserInDB(**user_doc) for user_doc in cursor]
+    try:
+      cursor = self.collection.find({}).skip(skip).limit(limit).sort("created_at", -1)
+      user_docs = cursor.to_list(length=limit)
+      return [UserInDB(**user_doc) for user_doc in user_docs]
+    except PyMongoError:
+      return []
   
   def count_users(self) -> int:
     """
@@ -206,7 +240,10 @@ class UserRepository:
     Returns:
         int: Total number of users in database
     """
-    return self.collection.count_documents({})
+    try:
+      return self.collection.count_documents({})
+    except PyMongoError:
+      return 0
   
   def user_exists(self, username: str) -> bool:
     """
@@ -218,4 +255,8 @@ class UserRepository:
     Returns:
         bool: True if user exists, False otherwise
     """
-    return self.collection.count_documents({"username": username}) > 0
+    try:
+      count = self.collection.count_documents({"username": username})
+      return count > 0
+    except PyMongoError:
+      return False

src/file-processor/app/exceptions/job_exceptions.py

@@ -0,0 +1,38 @@
+"""
+Custom exceptions for job management operations.
+
+This module defines specific exceptions for job processing lifecycle
+and repository operations to provide clear error handling.
+"""
+
+from app.models.job import ProcessingStatus
+
+
+class InvalidStatusTransitionError(Exception):
+  """
+  Raised when an invalid status transition is attempted.
+
+  This exception indicates that an attempt was made to change a job's
+  status to an invalid target status given the current status.
+  """
+  
+  def __init__(self, current_status: ProcessingStatus, target_status: ProcessingStatus):
+    self.current_status = current_status
+    self.target_status = target_status
+    super().__init__(
+      f"Invalid status transition from '{current_status}' to '{target_status}'"
+    )
+
+
+class JobRepositoryError(Exception):
+  """
+  Raised when a MongoDB operation fails in the job repository.
+
+  This exception wraps database-related errors that occur during
+  job repository operations.
+  """
+  
+  def __init__(self, operation: str, original_error: Exception):
+    self.operation = operation
+    self.original_error = original_error
+    super().__init__(f"Repository operation '{operation}' failed: {str(original_error)}")

src/file-processor/app/file_watcher.py

@@ -0,0 +1,242 @@
+"""
+File watcher implementation with Watchdog observer and ProcessingJob management.
+
+This module provides real-time file monitoring for document processing.
+When a file is created in the watched directory, it:
+1. Creates a document record via DocumentService
+2. Dispatches a Celery task for processing
+3. Creates a ProcessingJob to track the task lifecycle
+"""
+
+import logging
+import threading
+from pathlib import Path
+from typing import Optional
+
+from watchdog.events import FileSystemEventHandler, FileCreatedEvent
+from watchdog.observers import Observer
+
+from app.services.document_service import DocumentService
+from app.services.job_service import JobService
+
+logger = logging.getLogger(__name__)
+
+
+class DocumentFileEventHandler(FileSystemEventHandler):
+  """
+  Event handler for document file creation events.
+  
+  Processes newly created files by creating document records,
+  dispatching Celery tasks, and managing processing jobs.
+  """
+  
+  SUPPORTED_EXTENSIONS = {'.txt', '.pdf', '.docx', '.jpg', '.png', '.jpeg'}
+  
+  def __init__(self, document_service: DocumentService, job_service: JobService):
+    """
+    Initialize the event handler.
+    
+    Args:
+        document_service: Service for document management
+        job_service: Service for processing job management
+    """
+    super().__init__()
+    self.document_service = document_service
+    self.job_service = job_service
+  
+  def on_created(self, event: FileCreatedEvent) -> None:
+    """
+    Handle file creation events.
+    
+    Args:
+        event: File system event containing file path information
+    """
+    if event.is_directory:
+      return
+    
+    filepath = event.src_path
+    file_extension = Path(filepath).suffix.lower()
+    
+    if file_extension not in self.SUPPORTED_EXTENSIONS:
+      logger.info(f"Ignoring unsupported file type: {filepath}")
+      self.document_service.move_to_ignored(filepath, "unsupported file type")
+      return
+    
+    logger.info(f"Processing new file: {filepath}")
+    
+    try:
+      from tasks.document_processing import process_document
+      task_result = process_document.delay(filepath)
+      task_id = task_result.task_id
+      logger.info(f"Dispatched Celery task with ID: {task_id}")
+    
+    except Exception as e:
+      logger.error(f"Failed to process file {filepath}: {str(e)}")
+      # Note: We don't re-raise the exception to keep the watcher running
+
+
+class FileWatcher:
+  """
+  File system watcher for automatic document processing.
+  
+  Monitors a directory for new files and triggers processing pipeline
+  using a dedicated observer thread.
+  """
+  
+  def __init__(
+      self,
+      watch_directory: str,
+      document_service: DocumentService,
+      job_service: JobService,
+      recursive: bool = True
+  ):
+    """
+    Initialize the file watcher.
+    
+    Args:
+        watch_directory: Directory path to monitor
+        document_service: Service for document management
+        job_service: Service for processing job management
+        recursive: Whether to watch subdirectories recursively
+    """
+    self.watch_directory = Path(watch_directory)
+    self.recursive = recursive
+    self.observer: Optional[Observer] = None
+    self._observer_thread: Optional[threading.Thread] = None
+    self._stop_event = threading.Event()
+    
+    # Validate watch directory
+    if not self.watch_directory.exists():
+      raise ValueError(f"Watch directory does not exist: {watch_directory}")
+    
+    if not self.watch_directory.is_dir():
+      raise ValueError(f"Watch path is not a directory: {watch_directory}")
+    
+    # Create event handler
+    self.event_handler = DocumentFileEventHandler(
+      document_service=document_service,
+      job_service=job_service
+    )
+    
+    logger.info(f"FileWatcher initialized for directory: {self.watch_directory}")
+  
+  def start(self) -> None:
+    """
+    Start the file watcher in a separate thread.
+    
+    Raises:
+        RuntimeError: If the watcher is already running
+    """
+    if self.is_running():
+      raise RuntimeError("FileWatcher is already running")
+    
+    self.observer = Observer()
+    self.observer.schedule(
+      self.event_handler,
+      str(self.watch_directory),
+      recursive=self.recursive
+    )
+    
+    # Start observer in separate thread
+    self._observer_thread = threading.Thread(
+      target=self._run_observer,
+      name="FileWatcher-Observer"
+    )
+    self._stop_event.clear()
+    self._observer_thread.start()
+    
+    logger.info("FileWatcher started successfully")
+  
+  def stop(self, timeout: float = 5.0) -> None:
+    """
+    Stop the file watcher gracefully.
+    
+    Args:
+        timeout: Maximum time to wait for graceful shutdown
+    """
+    if not self.is_running():
+      logger.warning("FileWatcher is not running")
+      return
+    
+    logger.info("Stopping FileWatcher...")
+    
+    # Signal stop and wait for observer thread
+    self._stop_event.set()
+    
+    if self.observer:
+      self.observer.stop()
+    
+    if self._observer_thread and self._observer_thread.is_alive():
+      self._observer_thread.join(timeout=timeout)
+      
+      if self._observer_thread.is_alive():
+        logger.warning("FileWatcher thread did not stop gracefully within timeout")
+      else:
+        logger.info("FileWatcher stopped gracefully")
+    
+    # Clean up
+    self.observer = None
+    self._observer_thread = None
+  
+  def is_running(self) -> bool:
+    """
+    Check if the file watcher is currently running.
+    
+    Returns:
+        True if the watcher is running, False otherwise
+    """
+    return (
+        self.observer is not None
+        and self._observer_thread is not None
+        and self._observer_thread.is_alive()
+    )
+  
+  def _run_observer(self) -> None:
+    """
+    Internal method to run the observer in a separate thread.
+    
+    This method should not be called directly.
+    """
+    if not self.observer:
+      logger.error("Observer not initialized")
+      return
+    
+    try:
+      self.observer.start()
+      logger.info("Observer thread started")
+      
+      # Keep the observer running until stop is requested
+      while not self._stop_event.is_set():
+        self._stop_event.wait(timeout=1.0)
+      
+      logger.info("Observer thread stopping...")
+    
+    except Exception as e:
+      logger.error(f"Observer thread error: {str(e)}")
+    finally:
+      if self.observer:
+        self.observer.join()
+        logger.info("Observer thread stopped")
+
+
+def create_file_watcher(
+    watch_directory: str,
+    document_service: DocumentService,
+    job_service: JobService
+) -> FileWatcher:
+  """
+  Factory function to create a FileWatcher instance.
+  
+  Args:
+      watch_directory: Directory path to monitor
+      document_service: Service for document management
+      job_service: Service for processing job management
+      
+  Returns:
+      Configured FileWatcher instance
+  """
+  return FileWatcher(
+    watch_directory=watch_directory,
+    document_service=document_service,
+    job_service=job_service
+  )

src/file-processor/app/main.py

@@ -1,45 +1,119 @@
 """
-FastAPI application for MyDocManager file processor service.
+FastAPI application with integrated FileWatcher for document processing.
 
-This service provides API endpoints for health checks and task dispatching.
+This module provides the main FastAPI application with:
+- JWT authentication
+- User management APIs
+- Real-time file monitoring via FileWatcher
+- Document processing via Celery tasks
 """
 
-import os
-from fastapi import FastAPI, HTTPException
-from pydantic import BaseModel
-import redis
-from celery import Celery
+import logging
+from contextlib import asynccontextmanager
+from typing import AsyncGenerator
 
-# Initialize FastAPI app
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.routes.auth import router as auth_router
+from app.api.routes.users import router as users_router
+from app.api.routes.document import router as documents_router
+from app.config import settings
+from app.database.connection import get_database
+from app.file_watcher import create_file_watcher, FileWatcher
+from app.services.document_service import DocumentService
+from app.services.init_service import InitializationService
+from app.services.job_service import JobService
+from app.services.user_service import UserService
+
+# Configure logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+# Global file watcher instance
+file_watcher: FileWatcher = None
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
+  """
+  FastAPI lifespan context manager.
+  
+  Handles application startup and shutdown events including:
+  - Database connection
+  - Default admin user creation
+  - FileWatcher startup/shutdown
+  """
+  global file_watcher
+  
+  # Startup
+  logger.info("Starting MyDocManager application...")
+  
+  try:
+    # Initialize database connection
+    database = get_database()
+    logger.info("Database connection established")
+    
+    document_service = DocumentService(database=database, objects_folder=settings.get_objects_folder())
+    job_service = JobService(database=database)
+    user_service = UserService(database=database)
+    logger.info("Service created")
+    
+    # Create default admin user
+    init_service = InitializationService(user_service)
+    init_service.initialize_application()
+    logger.info("Default admin user initialization completed")
+    
+    # Create and start file watcher
+    file_watcher = create_file_watcher(
+      watch_directory=settings.get_watch_folder(),
+      document_service=document_service,
+      job_service=job_service
+    )
+    file_watcher.start()
+    logger.info(f"FileWatcher started for directory: {settings.get_watch_folder()}")
+    
+    logger.info("Application startup completed successfully")
+    
+    yield
+  
+  except Exception as e:
+    logger.error(f"Application startup failed: {str(e)}")
+    raise
+  
+  finally:
+    # Shutdown
+    logger.info("Shutting down MyDocManager application...")
+    
+    if file_watcher and file_watcher.is_running():
+      file_watcher.stop()
+      logger.info("FileWatcher stopped")
+    
+    logger.info("Application shutdown completed")
+
+
+# Create FastAPI application
 app = FastAPI(
-  title="MyDocManager File Processor",
-  description="File processing and task dispatch service",
-  version="1.0.0"
+  title="MyDocManager",
+  description="Real-time document processing application with authentication",
+  version="0.1.0",
+  lifespan=lifespan
 )
 
-# Environment variables
-REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379/0")
-MONGODB_URL = os.getenv("MONGODB_URL", "mongodb://localhost:27017")
-
-# Initialize Redis client
-try:
-  redis_client = redis.from_url(REDIS_URL)
-except Exception as e:
-  redis_client = None
-  print(f"Warning: Could not connect to Redis: {e}")
-
-# Initialize Celery
-celery_app = Celery(
-  "file_processor",
-  broker=REDIS_URL,
-  backend=REDIS_URL
+# Configure CORS
+app.add_middleware(
+  CORSMiddleware,
+  allow_origins=["http://localhost:5173", "http://localhost:5174"],  # React frontend
+  allow_credentials=True,
+  allow_methods=["*"],
+  allow_headers=["*"],
 )
 
-
-# Pydantic models
-class TestTaskRequest(BaseModel):
-  """Request model for test task."""
-  message: str
+# Include routers
+app.include_router(auth_router, prefix="/auth", tags=["Authentication"])
+app.include_router(users_router, prefix="/users", tags=["User Management"])
+app.include_router(documents_router, prefix="/api", tags=["Documents"])
+# app.include_router(jobs_router, prefix="/jobs", tags=["Processing Jobs"])
 
 
 @app.get("/health")
@@ -48,73 +122,49 @@ async def health_check():
   Health check endpoint.
   
   Returns:
-      dict: Service health status with dependencies
+      Dictionary containing application health status
   """
-  health_status = {
+  return {
       "status": "healthy",
-      "service": "file-processor",
-      "dependencies": {
-          "redis": "unknown",
-          "mongodb": "unknown"
-      },
+      "service": "MyDocManager",
+      "version": "1.0.0",
+      "file_watcher_running": file_watcher.is_running() if file_watcher else False
   }
 
-  # Check Redis connection
-  if redis_client:
-    try:
-      redis_client.ping()
-      health_status["dependencies"]["redis"] = "connected"
-    except Exception:
-      health_status["dependencies"]["redis"] = "disconnected"
-      health_status["status"] = "degraded"
-  
-  return health_status
-
-
-@app.post("/test-task")
-async def dispatch_test_task(request: TestTaskRequest):
-  """
-  Dispatch a test task to Celery worker.
-
-  Args:
-      request: Test task request containing message
-
-  Returns:
-      dict: Task dispatch information
-
-  Raises:
-      HTTPException: If task dispatch fails
-  """
-  try:
-    # Send task to worker
-    task = celery_app.send_task(
-      "main.test_task",
-      args=[request.message]
-    )
-    
-    return {
-        "status": "dispatched",
-        "task_id": task.id,
-        "message": f"Test task dispatched with message: {request.message}"
-    }
-  
-  except Exception as e:
-    raise HTTPException(
-      status_code=500,
-      detail=f"Failed to dispatch task: {str(e)}"
-    )
-
 
 @app.get("/")
 async def root():
   """
-  Root endpoint.
+  Root endpoint with basic application information.
   
   Returns:
-      dict: Basic service information
+      Dictionary containing welcome message and available endpoints
   """
   return {
-      "service": "MyDocManager File Processor",
-      "version": "1.0.0",
-      "status": "running"
+      "message": "Welcome to MyDocManager",
+      "description": "Real-time document processing application",
+      "docs": "/docs",
+      "health": "/health"
+  }
+
+
+@app.get("/watcher/status")
+async def watcher_status():
+  """
+  Get file watcher status.
+  
+  Returns:
+      Dictionary containing file watcher status information
+  """
+  if not file_watcher:
+    return {
+        "status": "not_initialized",
+        "running": False
+    }
+  
+  return {
+      "status": "initialized",
+      "running": file_watcher.is_running(),
+      "watch_directory": str(file_watcher.watch_directory),
+      "recursive": file_watcher.recursive
   }

src/file-processor/app/models/auth.py

@@ -3,12 +3,45 @@ Authentication models and enums for user management.
 
 Contains user roles enumeration and authentication-related Pydantic models.
 """
-
+from datetime import datetime
 from enum import Enum
 
+from pydantic import BaseModel, Field
+
+from app.models.types import PyObjectId
+
 
 class UserRole(str, Enum):
   """User roles enumeration with string values."""
   
   USER = "user"
   ADMIN = "admin"
+
+
+class UserResponse(BaseModel):
+  """Model for user data in API responses (excludes password_hash)."""
+  
+  id: PyObjectId = Field(alias="_id")
+  username: str
+  email: str
+  role: UserRole
+  is_active: bool
+  created_at: datetime
+  updated_at: datetime
+  
+  model_config = {
+      "populate_by_name": True,
+      "arbitrary_types_allowed": True,
+  }
+
+
+class LoginResponse(BaseModel):
+  """Response model for successful login."""
+  access_token: str
+  token_type: str = "bearer"
+  user: UserResponse
+
+
+class MessageResponse(BaseModel):
+  """Generic message response."""
+  message: str

src/file-processor/app/models/document.py

@@ -0,0 +1,96 @@
+"""
+Pydantic models for document processing collections.
+
+This module defines the data models for file documents and processing jobs
+stored in MongoDB collections.
+"""
+
+from datetime import datetime
+from enum import Enum
+from typing import Any, Dict, List, Optional
+
+from pydantic import BaseModel, Field, field_validator, ConfigDict
+
+from app.models.types import PyObjectId
+
+
+class FileType(str, Enum):
+  """Supported file types for document processing."""
+  
+  TXT = "txt"
+  PDF = "pdf"
+  DOCX = "docx"
+  JPG = "jpg"
+  PNG = "png"
+
+
+class ExtractionMethod(str, Enum):
+  """Methods used to extract content from documents."""
+  
+  DIRECT_TEXT = "direct_text"
+  OCR = "ocr"
+  HYBRID = "hybrid"
+
+
+class FileDocument(BaseModel):
+  """
+  Model for file documents stored in the 'files' collection.
+
+  Represents a file detected in the watched directory with its
+  metadata and extracted content.
+  """
+  
+  id: Optional[PyObjectId] = Field(default=None, alias="_id")
+  filename: str = Field(..., description="Original filename")
+  filepath: str = Field(..., description="Full path to the file")
+  file_type: FileType = Field(..., description="Type of the file")
+  extraction_method: Optional[ExtractionMethod] = Field(default=None, description="Method used to extract content")
+  metadata: Dict[str, Any] = Field(default_factory=dict, description="File-specific metadata")
+  detected_at: Optional[datetime] = Field(default=None, description="Timestamp when file was detected")
+  file_hash: Optional[str] = Field(default=None, description="SHA256 hash of file content")
+  pdf_file_hash: Optional[str] = Field(default=None, description="SHA256 hash of the associated pdf file content")
+  thumbnail_file_hash: Optional[str] = Field(default=None, description="SHA256 hash of the thumbnail")
+  encoding: str = Field(default="utf-8", description="Character encoding for text files")
+  file_size: int = Field(..., ge=0, description="File size in bytes")
+  mime_type: str = Field(..., description="MIME type detected")
+  
+  @field_validator('filepath')
+  @classmethod
+  def validate_filepath(cls, v: str) -> str:
+    """Validate filepath format."""
+    if not v.strip():
+      raise ValueError("Filepath cannot be empty")
+    return v.strip()
+  
+  @field_validator('filename')
+  @classmethod
+  def validate_filename(cls, v: str) -> str:
+    """Validate filename format."""
+    if not v.strip():
+      raise ValueError("Filename cannot be empty")
+    return v.strip()
+
+
+class DocumentResponse(BaseModel):
+  """
+  Response model for document API endpoints.
+  
+  Represents a document in the format expected by the frontend application.
+  Field names are automatically converted from snake_case to camelCase.
+  """
+  
+  model_config = ConfigDict(alias_generator=lambda field_name: ''.join(
+    word.capitalize() if i > 0 else word
+    for i, word in enumerate(field_name.split('_'))
+  ), populate_by_name=True)
+  
+  id: str = Field(..., description="Document unique identifier")
+  name: str = Field(..., description="Document filename")
+  original_file_type: str = Field(..., description="Original file type before conversion")
+  created_at: str = Field(..., description="ISO timestamp when document was created")
+  file_size: int = Field(..., description="File size in bytes")
+  page_count: int = Field(..., description="Number of pages in the document")
+  thumbnail_url: Optional[str] = Field(default=None, description="URL to document thumbnail")
+  pdf_url: Optional[str] = Field(default=None, description="URL to PDF version of document")
+  tags: List[str] = Field(default_factory=list, description="Document tags")
+  categories: List[str] = Field(default_factory=list, description="Document categories")

src/file-processor/app/models/job.py

@@ -0,0 +1,45 @@
+from datetime import datetime
+from enum import Enum
+from typing import Optional
+
+from bson import ObjectId
+from pydantic import BaseModel, Field, field_validator
+
+from app.models.types import PyObjectId
+
+
+class ProcessingStatus(str, Enum):
+  """Status values for processing jobs."""
+  
+  PENDING = "pending"
+  PROCESSING = "processing"
+  COMPLETED = "completed"
+  SAVING_OBJECT = "saving_object"
+  SAVING_PDF = "saving_pdf"
+  CREATING_THUMBNAIL = "creating_thumbnail"
+  FAILED = "failed"
+
+
+class ProcessingJob(BaseModel):
+  """
+  Model for processing jobs stored in the 'processing_jobs' collection.
+
+  Tracks the lifecycle and status of document processing tasks.
+  """
+  
+  id: Optional[PyObjectId] = Field(default=None, alias="_id")
+  document_id: PyObjectId = Field(..., description="Reference to file document")
+  status: ProcessingStatus = Field(default=ProcessingStatus.PENDING, description="Current processing status")
+  task_id: Optional[str] = Field(default=None, description="Celery task UUID")
+  created_at: Optional[datetime] = Field(default=None, description="Timestamp when job was created")
+  started_at: Optional[datetime] = Field(default=None, description="Timestamp when processing started")
+  completed_at: Optional[datetime] = Field(default=None, description="Timestamp when processing completed")
+  error_message: Optional[str] = Field(default=None, description="Error message if processing failed")
+  
+  @field_validator('error_message')
+  @classmethod
+  def validate_error_message(cls, v: Optional[str]) -> Optional[str]:
+    """Clean up error message."""
+    if v is not None:
+      return v.strip() if v.strip() else None
+    return v

src/file-processor/app/models/types.py

@@ -0,0 +1,32 @@
+from typing import Any
+
+from bson import ObjectId
+from pydantic_core import core_schema
+
+
+class PyObjectId(ObjectId):
+  """Custom ObjectId type for Pydantic v2 compatibility."""
+  
+  @classmethod
+  def __get_pydantic_core_schema__(
+      cls, source_type: Any, handler
+  ) -> core_schema.CoreSchema:
+    return core_schema.json_or_python_schema(
+      json_schema=core_schema.str_schema(),
+      python_schema=core_schema.union_schema([
+          core_schema.is_instance_schema(ObjectId),
+          core_schema.chain_schema([
+              core_schema.str_schema(),
+              core_schema.no_info_plain_validator_function(cls.validate),
+          ])
+      ]),
+      serialization=core_schema.plain_serializer_function_ser_schema(
+        lambda x: str(x)
+      ),
+    )
+  
+  @classmethod
+  def validate(cls, v):
+    if not ObjectId.is_valid(v):
+      raise ValueError("Invalid ObjectId")
+    return ObjectId(v)

src/file-processor/app/models/user.py

@@ -7,173 +7,136 @@ and API responses with proper validation and type safety.
 
 import re
 from datetime import datetime
-from typing import Optional, Any
+from typing import Optional
+
 from bson import ObjectId
 from pydantic import BaseModel, Field, field_validator, EmailStr
-from pydantic_core import core_schema
 
 from app.models.auth import UserRole
-
-
-class PyObjectId(ObjectId):
-    """Custom ObjectId type for Pydantic v2 compatibility."""
-    
-    @classmethod
-    def __get_pydantic_core_schema__(
-        cls, source_type: Any, handler
-    ) -> core_schema.CoreSchema:
-        return core_schema.json_or_python_schema(
-            json_schema=core_schema.str_schema(),
-            python_schema=core_schema.union_schema([
-                core_schema.is_instance_schema(ObjectId),
-                core_schema.chain_schema([
-                    core_schema.str_schema(),
-                    core_schema.no_info_plain_validator_function(cls.validate),
-                ])
-            ]),
-            serialization=core_schema.plain_serializer_function_ser_schema(
-                lambda x: str(x)
-            ),
-        )
-    
-    @classmethod
-    def validate(cls, v):
-        if not ObjectId.is_valid(v):
-            raise ValueError("Invalid ObjectId")
-        return ObjectId(v)
+from app.models.types import PyObjectId
 
 
 def validate_password_strength(password: str) -> str:
-    """
-    Validate password meets security requirements.
+  """
+  Validate password meets security requirements.
   
-    Requirements:
-    - At least 8 characters long
-    - Contains at least one uppercase letter
-    - Contains at least one lowercase letter
-    - Contains at least one digit
-    - Contains at least one special character
+  Requirements:
+  - At least 8 characters long
+  - Contains at least one uppercase letter
+  - Contains at least one lowercase letter
+  - Contains at least one digit
+  - Contains at least one special character
   
-    Args:
-        password: The password string to validate
+  Args:
+      password: The password string to validate
       
-    Returns:
-        str: The validated password
+  Returns:
+      str: The validated password
       
-    Raises:
-        ValueError: If password doesn't meet requirements
-    """
-    if len(password) < 8:
-        raise ValueError("Password must be at least 8 characters long")
+  Raises:
+      ValueError: If password doesn't meet requirements
+  """
+  if len(password) < 8:
+    raise ValueError("Password must be at least 8 characters long")
   
-    if not re.search(r'[A-Z]', password):
-        raise ValueError("Password must contain at least one uppercase letter")
+  if not re.search(r'[A-Z]', password):
+    raise ValueError("Password must contain at least one uppercase letter")
   
-    if not re.search(r'[a-z]', password):
-        raise ValueError("Password must contain at least one lowercase letter")
+  if not re.search(r'[a-z]', password):
+    raise ValueError("Password must contain at least one lowercase letter")
   
-    if not re.search(r'\d', password):
-        raise ValueError("Password must contain at least one digit")
+  if not re.search(r'\d', password):
+    raise ValueError("Password must contain at least one digit")
   
-    if not re.search(r'[!@#$%^&*()_+\-=\[\]{};:"\\|,.<>\/?]', password):
-        raise ValueError("Password must contain at least one special character")
+  if not re.search(r'[!@#$%^&*()_+\-=\[\]{};:"\\|,.<>\/?]', password):
+    raise ValueError("Password must contain at least one special character")
   
-    return password
+  return password
 
 
 def validate_username_not_empty(username: str) -> str:
-    """
-    Validate username is not empty or whitespace only.
+  """
+  Validate username is not empty or whitespace only.
   
-    Args:
-        username: The username string to validate
+  Args:
+      username: The username string to validate
       
-    Returns:
-        str: The validated username
+  Returns:
+      str: The validated username
       
-    Raises:
-        ValueError: If username is empty or whitespace only
-    """
-    if not username or not username.strip():
-        raise ValueError("Username cannot be empty or whitespace only")
+  Raises:
+      ValueError: If username is empty or whitespace only
+  """
+  if not username or not username.strip():
+    raise ValueError("Username cannot be empty or whitespace only")
   
-    return username.strip()
+  return username.strip()
 
 
-class UserCreate(BaseModel):
-    """Model for creating a new user."""
+class UserCreateNoValidation(BaseModel):
+  """Model for creating a new user."""
   
-    username: str
-    email: EmailStr
-    password: str
-    role: UserRole = UserRole.USER
+  username: str
+  email: str
+  password: str
+  role: UserRole = UserRole.USER
 
-    @field_validator('username')
-    @classmethod
-    def validate_username(cls, v):
-        return validate_username_not_empty(v)
 
-    @field_validator('password')
-    @classmethod
-    def validate_password(cls, v):
-        return validate_password_strength(v)
+class UserCreate(UserCreateNoValidation):
+  """Model for creating a new user."""
+  email: EmailStr
+  
+  @field_validator('username')
+  @classmethod
+  def validate_username(cls, v):
+    return validate_username_not_empty(v)
+  
+  @field_validator('password')
+  @classmethod
+  def validate_password(cls, v):
+    return validate_password_strength(v)
 
 
 class UserUpdate(BaseModel):
-    """Model for updating an existing user."""
+  """Model for updating an existing user."""
   
-    username: Optional[str] = None
-    email: Optional[EmailStr] = None
-    password: Optional[str] = None
-    role: Optional[UserRole] = None
+  username: Optional[str] = None
+  email: Optional[EmailStr] = None
+  password: Optional[str] = None
+  role: Optional[UserRole] = None
+  is_active: Optional[bool] = None
+  preferences: Optional[dict] = None
   
-    @field_validator('username')
-    @classmethod
-    def validate_username(cls, v):
-        if v is not None:
-            return validate_username_not_empty(v)
-        return v
+  @field_validator('username')
+  @classmethod
+  def validate_username(cls, v):
+    if v is not None:
+      return validate_username_not_empty(v)
+    return v
   
-    @field_validator('password')
-    @classmethod
-    def validate_password(cls, v):
-        if v is not None:
-            return validate_password_strength(v)
-        return v
+  @field_validator('password')
+  @classmethod
+  def validate_password(cls, v):
+    if v is not None:
+      return validate_password_strength(v)
+    return v
 
 
 class UserInDB(BaseModel):
-    """Model for user data stored in database."""
+  """Model for user data stored in database."""
   
-    id: PyObjectId = Field(default_factory=PyObjectId, alias="_id")
-    username: str
-    email: str
-    password_hash: str
-    role: UserRole
-    is_active: bool = True
-    created_at: datetime
-    updated_at: datetime
+  id: PyObjectId = Field(default_factory=PyObjectId, alias="_id")
+  username: str
+  email: str
+  hashed_password: str
+  role: UserRole
+  is_active: bool = True
+  preferences: dict = Field(default_factory=dict)
+  created_at: datetime
+  updated_at: datetime
   
-    model_config = {
-        "populate_by_name": True,
-        "arbitrary_types_allowed": True,
-        "json_encoders": {ObjectId: str}
-    }
-
-
-class UserResponse(BaseModel):
-    """Model for user data in API responses (excludes password_hash)."""
-    
-    id: PyObjectId = Field(alias="_id")
-    username: str
-    email: str
-    role: UserRole
-    is_active: bool
-    created_at: datetime
-    updated_at: datetime
-    
-    model_config = {
-        "populate_by_name": True,
-        "arbitrary_types_allowed": True,
-        "json_encoders": {ObjectId: str}
-    }
+  model_config = {
+      "populate_by_name": True,
+      "arbitrary_types_allowed": True,
+      "json_encoders": {ObjectId: str}
+  }

src/file-processor/app/services/auth_service.py

@@ -0,0 +1,84 @@
+"""
+Authentication service for password hashing and verification.
+
+This module provides authentication-related functionality including
+password hashing, verification, and JWT token management.
+"""
+from datetime import datetime, timedelta
+
+import jwt
+
+from app.config import settings
+from app.utils.security import hash_password, verify_password
+
+
+class AuthService:
+  """
+  Service class for authentication operations.
+
+  Handles password hashing, verification, and other authentication
+  related operations with proper security practices.
+  """
+  
+  @staticmethod
+  def hash_user_password(password: str) -> str:
+    """
+    Hash a plaintext password for secure storage.
+
+    Args:
+        password (str): Plaintext password to hash
+
+    Returns:
+        str: Hashed password safe for database storage
+
+    Example:
+        >>> auth = AuthService()
+        >>> hashed = auth.hash_user_password("mypassword123")
+        >>> len(hashed) > 0
+        True
+    """
+    return hash_password(password)
+  
+  @staticmethod
+  def verify_user_password(password: str, hashed_password: str) -> bool:
+    """
+    Verify a password against its hash.
+
+    Args:
+        password (str): Plaintext password to verify
+        hashed_password (str): Stored hashed password
+
+    Returns:
+        bool: True if password matches hash, False otherwise
+
+    Example:
+        >>> auth = AuthService()
+        >>> hashed = auth.hash_user_password("mypassword123")
+        >>> auth.verify_user_password("mypassword123", hashed)
+        True
+        >>> auth.verify_user_password("wrongpassword", hashed)
+        False
+    """
+    return verify_password(password, hashed_password)
+  
+  @staticmethod
+  def create_access_token(data=dict) -> str:
+    """
+      Create a JWT access token.
+
+      Args:
+          data (dict): Payload data to include in the token.
+
+      Returns:
+          str: Encoded JWT token.
+      """
+    # Copy data to avoid modifying the original dict
+    to_encode = data.copy()
+    
+    # Add expiration time
+    expire = datetime.now() + timedelta(hours=settings.get_jwt_expire_hours())
+    to_encode.update({"exp": expire})
+    
+    # Encode JWT
+    encoded_jwt = jwt.encode(to_encode, settings.get_jwt_secret_key(), algorithm=settings.get_jwt_algorithm())
+    return encoded_jwt

src/file-processor/app/services/document_service.py

@@ -0,0 +1,497 @@
+"""
+Document service for orchestrated file and content management.
+
+This service coordinates between FileDocument and DocumentContent repositories
+while maintaining data consistency through MongoDB transactions.
+"""
+
+import hashlib
+import logging
+import os
+import shutil
+from datetime import datetime
+from pathlib import Path
+from typing import List, Optional, Dict, Any
+
+import magic
+from pymongo.errors import PyMongoError
+
+from app.config.settings import get_objects_folder, get_temp_folder, get_errors_folder, get_ignored_folder
+from app.database.repositories.document_repository import FileDocumentRepository
+from app.models.document import (
+  FileDocument,
+  FileType,
+)
+from app.models.types import PyObjectId
+from app.utils.pdf_converter import convert_to_pdf
+from app.utils.pdf_thumbmail import PDFThumbnailGenerator
+from app.utils.security import generate_uuid_filename
+
+logger = logging.getLogger(__name__)
+
+
+class DocumentAlreadyExists(Exception):
+  def __init__(self, message):
+    self.message = message
+
+
+class DocumentProcessingError(Exception):
+  def __init__(self, message):
+    self.message = message
+
+
+class DocumentService:
+  """
+  Service for orchestrated document and content management.
+
+  Provides high-level operations that coordinate between file documents
+  and their content while ensuring data consistency through transactions.
+  """
+  
+  def __init__(self, database,
+               objects_folder: str = None,
+               temp_folder: str = None,
+               errors_folder: str = None,
+               ignored_folder: str = None):
+    """
+    Initialize the document service with repository dependencies.
+    
+    Args:
+        database: Database instance
+        objects_folder: folder to store files by their hash
+    """
+    
+    self.db = database
+    self.document_repository = FileDocumentRepository(self.db)
+    self.objects_folder = objects_folder or get_objects_folder()
+    self.temp_folder = temp_folder or get_temp_folder()
+    self.errors_folder = errors_folder or get_errors_folder()
+    self.ignored_folder = ignored_folder or get_ignored_folder()
+  
+  def initialize(self):
+    self.document_repository.initialize()
+    return self
+  
+  @staticmethod
+  def _calculate_file_hash(file_bytes: bytes) -> str:
+    """
+    Calculate SHA256 hash of file content.
+
+    Args:
+        file_bytes: Raw file content as bytes
+
+    Returns:
+        Hexadecimal SHA256 hash string
+    """
+    return hashlib.sha256(file_bytes).hexdigest()
+  
+  @staticmethod
+  def _detect_file_type(file_path: str) -> FileType:
+    """
+    Detect file type from file extension.
+
+    Args:
+        file_path: Path to the file
+
+    Returns:
+        FileType enum value
+
+    Raises:
+        ValueError: If file type is not supported
+    """
+    extension = Path(file_path).suffix.lower().lstrip('.')
+    
+    try:
+      return FileType(extension)
+    except ValueError:
+      raise ValueError(f"Unsupported file type: {extension}")
+  
+  @staticmethod
+  def _detect_mime_type(file_bytes: bytes) -> str:
+    """
+    Detect MIME type from file content.
+
+    Args:
+        file_bytes: Raw file content as bytes
+
+    Returns:
+        MIME type string
+    """
+    return magic.from_buffer(file_bytes, mime=True)
+  
+  @staticmethod
+  def _read_file_bytes(file_path: str | Path) -> bytes:
+    """
+    Read file content as bytes asynchronously.
+
+    Args:
+        file_path (str | Path): Path of the file to read
+
+    Returns:
+        bytes: Content of the file
+
+    Raises:
+        FileNotFoundError: If the file does not exist
+        OSError: If any I/O error occurs
+    """
+    path = Path(file_path)
+    
+    if not path.exists():
+      raise FileNotFoundError(f"File not found: {file_path}")
+    
+    return path.read_bytes()
+  
+  @staticmethod
+  def _get_safe_path(file_path):
+    """
+    If the path already exists, add a suffix to the filename.
+    Increment the suffix until a safe path is found.
+    :param file_path:
+    :return:
+    """
+    path = Path(file_path)
+    
+    # If the path doesn't exist, return it as is
+    if not path.exists():
+      return file_path
+    
+    # Split the filename and extension
+    stem = path.stem
+    suffix = path.suffix
+    directory = path.parent
+    
+    # Try incrementing numbers until a unique path is found
+    counter = 1
+    while True:
+      # Create new filename with counter
+      new_filename = f"{stem}_{counter}{suffix}"
+      new_path = os.path.join(directory, new_filename)
+      
+      # Check if this new path exists
+      if not os.path.exists(new_path):
+        return new_path
+      
+      # Increment counter for next attempt
+      counter += 1
+  
+  def get_document_path(self, file_hash):
+    """
+
+    :param file_hash:
+    :return:
+    """
+    return os.path.join(self.objects_folder, file_hash[:24], file_hash)
+  
+  def exists(self, file_hash):
+    if file_hash is None:
+      return False
+    return os.path.exists(self.get_document_path(file_hash))
+  
+  def save_content_if_needed(self, file_hash, content: bytes):
+    target_path = self.get_document_path(file_hash)
+    if os.path.exists(target_path):
+      return
+    
+    if not os.path.exists(os.path.dirname(target_path)):
+      os.makedirs(os.path.dirname(target_path))
+    
+    with open(target_path, "wb") as f:
+      f.write(content)
+  
+  def move_to_errors(self, document_id, file_path):
+    logger.info(f"Moving file {file_path} to error folder")
+    error_file_name = f"{document_id}_{os.path.basename(file_path)}"
+    error_file_path = self._get_safe_path(os.path.join(self.errors_folder, error_file_name))
+    shutil.move(file_path, error_file_path)
+  
+  def move_to_ignored(self, file_path, reason="Unknown"):
+    logger.info(f"Moving file {file_path} to ignored folder")
+    ignored_file_name = datetime.now().strftime("%Y-%m-%d_%H-%M-%S") + f"_### {reason} ###_" + os.path.basename(
+      file_path)
+    ignored_file_path = self._get_safe_path(os.path.join(self.ignored_folder, ignored_file_name))
+    shutil.move(file_path, ignored_file_path)
+  
+  def create_document(
+      self,
+      file_path: str,
+      file_bytes: bytes | None = None,
+      encoding: str = "utf-8"
+  ) -> FileDocument:
+    """
+    Create a new document with automatic deduplication.
+
+    This method handles the creation of both FileDocument and DocumentContent
+    with proper deduplication based on file hash. If content with the same
+    hash already exists, only a new FileDocument is created.
+
+    Args:
+        file_path: Full path to the file
+        file_bytes: Raw file content as bytes
+        encoding: Character encoding for text content
+
+    Returns:
+        Created FileDocument instance
+
+    Raises:
+        ValueError: If file type is not supported
+        PyMongoError: If database operation fails
+    """
+    # Calculate automatic attributes
+    file_bytes = file_bytes if file_bytes is not None else self._read_file_bytes(file_path)
+    file_hash = self._calculate_file_hash(file_bytes)
+    file_type = self._detect_file_type(file_path)
+    mime_type = self._detect_mime_type(file_bytes)
+    file_size = len(file_bytes)
+    filename = Path(file_path).name
+    detected_at = datetime.now()
+    
+    try:
+      logger.info(f'Creating Document for "{file_path}"')
+      # Skip the document if it already exists
+      same_document = self.document_repository.find_same_document(filename, file_hash)
+      if same_document is not None:
+        logger.info(f"  Document with same hash already exists. Skipping...")
+        self.move_to_ignored(file_path, f"already exists ({same_document.id})")
+        raise DocumentAlreadyExists(f"Document with same hash already exists ({same_document.id})")
+      
+      self.save_content_if_needed(file_hash, file_bytes)
+      logger.info(f"  Saved content to {self.get_document_path(file_hash)}")
+      
+      # Create FileDocument
+      file_data = FileDocument(
+        filename=filename,
+        filepath=file_path,
+        file_type=file_type,
+        extraction_method=None,  # Will be set by processing workers
+        metadata={},  # Empty for now
+        detected_at=detected_at,
+        file_hash=file_hash,
+        encoding=encoding,
+        file_size=file_size,
+        mime_type=mime_type
+      )
+      
+      created_document = self.document_repository.create_document(file_data)
+      logger.info(f"  Created document with id '{created_document.id}'")
+      
+      return created_document
+    
+    except DocumentAlreadyExists as e:
+      raise e
+    except Exception as e:
+      # Transaction will automatically rollback if supported
+      raise PyMongoError(f"Failed to create document: {str(e)}")
+  
+  def create_pdf(self, document_id: PyObjectId):
+    """
+    For all files, a controlled pdf version will be created for standard visualization and action
+    :return:
+    """
+    logger.info(f"Creating PDF document for {document_id}")
+    document = self.get_document_by_id(document_id)
+    if document is None:
+      logger.error(f"  Document not found")
+      raise DocumentProcessingError(f"Document {document_id} not found.")
+    
+    # try to find another document that has the same hash
+    document_with_same_hash = self.get_document_with_pdf_hash(document.file_hash)
+    
+    # the pdf will be created only if it does not exist yet
+    if document_with_same_hash and self.exists(document_with_same_hash.pdf_file_hash):
+      logger.info(f'Found document with same hash. Will use pdf "{document_with_same_hash.pdf_file_hash}".')
+      self.update_document(document_id, {"pdf_file_hash": document_with_same_hash.pdf_file_hash})
+      return
+    
+    # get the content of the file
+    logger.info(f"  No document with same hash and valid pdf found. Will create new pdf content.")
+    file_bytes = self.get_document_content_by_hash(document.file_hash)
+    if file_bytes is None:
+      logger.error(f'Content for document "{document_id}" not found. hash = "{document.file_hash}".')
+      raise DocumentProcessingError(f'Content for document "{document_id}" not found. hash = "{document.file_hash}".')
+    
+    # create the pdf file
+    temp_pdf_file = convert_to_pdf(self.get_document_path(document.file_hash), self.temp_folder)
+    pdf_file_hash = self._calculate_file_hash(self._read_file_bytes(temp_pdf_file))
+    self.save_content_if_needed(pdf_file_hash, self._read_file_bytes(temp_pdf_file))
+    os.remove(temp_pdf_file)  # remove the temporary file
+    logger.info(f'  Created new pdf file with hash "{pdf_file_hash}"')
+    
+    # update the document
+    self.update_document(document_id, {"pdf_file_hash": pdf_file_hash})
+  
+  def create_thumbnail(self, document_id: PyObjectId):
+    logger.info(f'Creating thumbnail document for "{document_id}"')
+    document = self.get_document_by_id(document_id)
+    if document is None:
+      logger.error(f"  Document not found !")
+      raise DocumentProcessingError(f"Document {document_id} not found.")
+    
+    # try to find another document that has the same hash
+    document_with_same_hash = self.get_document_with_pdf_hash(document.file_hash)
+    
+    # We will use the thumbnail of the pdf if it exists
+    if document_with_same_hash and self.exists(document_with_same_hash.thumbnail_file_hash):
+      logger.info(f"  Found document with same hash. Will use thumbnail {document_with_same_hash.thumbnail_file_hash}")
+      self.update_document(document_id, {"thumbnail_file_hash": document_with_same_hash.thumbnail_file_hash})
+      return
+    
+    logger.info(f"  No document with same hash and valid thumbnail found. Will create new thumbnail")
+    
+    if not self.exists(document.pdf_file_hash):
+      logger.error(f"  PDF file not found.")
+      raise DocumentProcessingError(f"PDF file for document {document_id} not found")
+    
+    tmp_thumbnail_path = os.path.join(self.temp_folder, f"{generate_uuid_filename()}.png")
+    with PDFThumbnailGenerator(self.get_document_path(document.pdf_file_hash)) as gen:
+      # create the thumbnail
+      gen.create_thumbnail(tmp_thumbnail_path, page_num=0, width=200)
+      thumbnail_file_hash = self._calculate_file_hash(self._read_file_bytes(tmp_thumbnail_path))
+      
+      # save the thumbnail to the objects folder
+      self.save_content_if_needed(thumbnail_file_hash, self._read_file_bytes(tmp_thumbnail_path))
+      os.remove(tmp_thumbnail_path)
+      
+      # update the document
+      self.update_document(document_id, {"thumbnail_file_hash": thumbnail_file_hash})
+      logger.info(f"  Created thumbnail {thumbnail_file_hash}")
+  
+  def get_document_by_id(self, document_id: PyObjectId) -> Optional[FileDocument]:
+    """
+    Retrieve a document by its ID.
+
+    Args:
+        document_id: Document ObjectId
+
+    Returns:
+        FileDocument if found, None otherwise
+    """
+    return self.document_repository.find_document_by_id(str(document_id))
+  
+  def get_document_by_hash(self, file_hash: str) -> Optional[FileDocument]:
+    """
+    Retrieve a document by its file hash.
+
+    Args:
+        file_hash: SHA256 hash of file content
+
+    Returns:
+        FileDocument if found, None otherwise
+    """
+    return self.document_repository.find_document_by_hash(file_hash)
+  
+  def get_document_with_pdf_hash(self, file_hash) -> Optional[FileDocument]:
+    return self.document_repository.find_document_with_pdf_hash(file_hash)
+  
+  def get_document_by_filepath(self, filepath: str) -> Optional[FileDocument]:
+    """
+    Retrieve a document by its file path.
+
+    Args:
+        filepath: Full path to the file
+
+    Returns:
+        FileDocument if found, None otherwise
+    """
+    return self.document_repository.find_document_by_filepath(filepath)
+  
+  def get_document_content_by_hash(self, file_hash):
+    target_path = self.get_document_path(file_hash)
+    if not os.path.exists(target_path):
+      return None
+    
+    with open(target_path, "rb") as f:
+      return f.read()
+  
+  def list_documents(
+      self,
+      skip: int = 0,
+      limit: int = 100
+  ) -> List[FileDocument]:
+    """
+    List documents with pagination.
+
+    Args:
+        skip: Number of documents to skip
+        limit: Maximum number of documents to return
+
+    Returns:
+        List of FileDocument instances
+    """
+    return self.document_repository.list_documents(skip=skip, limit=limit)
+  
+  def count_documents(self) -> int:
+    """
+    Get total number of documents.
+
+    Returns:
+        Total document count
+    """
+    return self.document_repository.count_documents()
+  
+  def update_document(
+      self,
+      document_id: PyObjectId,
+      update_data: Dict[str, Any]
+  ) -> Optional[FileDocument]:
+    """
+    Update document metadata.
+
+    Args:
+        document_id: Document ObjectId
+        update_data: Dictionary with fields to update
+
+    Returns:
+        Updated FileDocument if found, None otherwise
+    """
+    if "file_bytes" in update_data:
+      file_hash = self._calculate_file_hash(update_data["file_bytes"])
+      update_data["file_hash"] = file_hash
+      self.save_content_if_needed(file_hash, update_data["file_bytes"])
+    
+    return self.document_repository.update_document(document_id, update_data)
+  
+  def delete_document(self, document_id: PyObjectId) -> bool:
+    """
+    Delete a document and its orphaned content.
+
+    This method removes the FileDocument and checks if the associated
+    DocumentContent is orphaned (no other files reference it). If orphaned,
+    the content is also deleted.
+
+    Args:
+        document_id: Document ObjectId
+
+    Returns:
+        True if document was deleted, False otherwise
+
+    Raises:
+        PyMongoError: If database operation fails
+    """
+    # Start transaction
+    
+    try:
+      # Get document to find its hash
+      document = self.document_repository.find_document_by_id(document_id)
+      if not document:
+        return False
+      
+      # Delete the document
+      deleted = self.document_repository.delete_document(document_id)
+      if not deleted:
+        return False
+      
+      # Check if content is orphaned
+      remaining_files = self.document_repository.find_document_by_hash(document.file_hash)
+      
+      # If no other files reference this content, delete it
+      if not remaining_files:
+        try:
+          os.remove(self.get_document_path(document.file_hash))
+        except Exception:
+          pass
+      
+      return True
+    
+    except Exception as e:
+      # Transaction will automatically rollback if supported
+      raise PyMongoError(f"Failed to delete document: {str(e)}")

src/file-processor/app/services/init_service.py

@@ -0,0 +1,152 @@
+"""
+Initialization service for application startup tasks.
+
+This module handles application initialization tasks including
+creating default admin user if none exists.
+"""
+
+import logging
+from typing import Optional
+
+from app.models.auth import UserRole
+from app.models.user import UserInDB, UserCreateNoValidation
+from app.services.user_service import UserService
+
+logger = logging.getLogger(__name__)
+
+
+class InitializationService:
+  """
+  Service for handling application initialization tasks.
+
+  This service manages startup operations like ensuring required
+  users exist and system is properly configured.
+  """
+  
+  def __init__(self, user_service: UserService):
+    """
+    Initialize service with user service dependency.
+
+    Args:
+        user_service (UserService): Service for user operations
+    """
+    self.user_service = user_service
+  
+  def ensure_admin_user_exists(self) -> Optional[UserInDB]:
+    """
+    Ensure default admin user exists in the system.
+
+    Creates a default admin user if no admin user exists in the system.
+    Uses default credentials that should be changed after first login.
+
+    Returns:
+        UserInDB or None: Created admin user if created, None if already exists
+
+    Raises:
+        Exception: If admin user creation fails
+    """
+    logger.info("Checking if admin user exists...")
+    
+    # Check if any admin user already exists
+    if self._admin_user_exists():
+      logger.info("Admin user already exists, skipping creation")
+      return None
+    
+    logger.info("No admin user found, creating default admin user...")
+    
+    try:
+      # Create default admin user
+      admin_data = UserCreateNoValidation(
+        username="admin",
+        email="admin@mydocmanager.local",
+        password="admin",  # Should be changed after first login
+        role=UserRole.ADMIN
+      )
+      
+      created_user = self.user_service.create_user(admin_data)
+      logger.info(f"Default admin user created successfully with ID: {created_user.id}")
+      logger.warning(
+        "Default admin user created with username 'admin' and password 'admin'. "
+        "Please change these credentials immediately for security!"
+      )
+      
+      return created_user
+    
+    except Exception as e:
+      logger.error(f"Failed to create default admin user: {str(e)}")
+      raise Exception(f"Admin user creation failed: {str(e)}")
+  
+  def _admin_user_exists(self) -> bool:
+    """
+    Check if any admin user exists in the system.
+
+    Returns:
+        bool: True if at least one admin user exists, False otherwise
+    """
+    try:
+      # Get all users and check if any have admin role
+      users = self.user_service.list_users(limit=1000)  # Reasonable limit for admin check
+      
+      for user in users:
+        if user.role == UserRole.ADMIN and user.is_active:
+          return True
+      
+      return False
+    
+    except Exception as e:
+      logger.error(f"Error checking for admin users: {str(e)}")
+      # In case of error, assume admin exists to avoid creating duplicates
+      return True
+  
+  def initialize_application(self) -> dict:
+    """
+    Perform all application initialization tasks.
+
+    This method runs all necessary initialization procedures including
+    admin user creation and any other startup requirements.
+
+    Returns:
+        dict: Summary of initialization tasks performed
+    """
+    logger.info("Starting application initialization...")
+    
+    initialization_summary = {
+        "admin_user_created": False,
+        "initialization_success": False,
+        "errors": []
+    }
+    
+    try:
+      # Ensure admin user exists
+      created_admin = self.ensure_admin_user_exists()
+      if created_admin:
+        initialization_summary["admin_user_created"] = True
+      
+      initialization_summary["initialization_success"] = True
+      logger.info("Application initialization completed successfully")
+    
+    except Exception as e:
+      error_msg = f"Application initialization failed: {str(e)}"
+      logger.error(error_msg)
+      initialization_summary["errors"].append(error_msg)
+    
+    self.log_initialization_result(initialization_summary)
+    
+    return initialization_summary
+  
+  @staticmethod
+  def log_initialization_result(summary: dict) -> None:
+    """
+    Log the result of the initialization process.
+
+    Args:
+        summary (dict): Summary of initialization tasks performed
+    """
+    if summary["initialization_success"]:
+      logger.info("Application startup completed successfully")
+      if summary["admin_user_created"]:
+        logger.info("Default admin user was created during startup")
+    else:
+      logger.error("Application startup completed with errors:")
+      for error in summary["errors"]:
+        logger.error(f"  - {error}")

src/file-processor/app/services/job_service.py

@@ -0,0 +1,189 @@
+"""
+Service layer for job processing business logic.
+
+This module provides high-level operations for managing processing jobs
+with strict status transition validation and business rules enforcement.
+"""
+
+from typing import Optional
+
+from app.database.repositories.job_repository import JobRepository
+from app.exceptions.job_exceptions import InvalidStatusTransitionError
+from app.models.job import ProcessingJob, ProcessingStatus
+from app.models.types import PyObjectId
+
+
+class JobService:
+  """
+  Service for processing job business logic operations.
+
+  Provides high-level job management with strict status transition
+  validation and business rule enforcement.
+  """
+  
+  def __init__(self, database):
+    """
+    Initialize service with job repository.
+
+    Args:
+        repository: Optional JobRepository instance (creates default if None)
+    """
+    self.db = database
+    self.repository = JobRepository(database)
+  
+  def initialize(self):
+    self.repository.initialize()
+    return self
+  
+  def create_job(self, document_id: PyObjectId, task_id: Optional[str] = None) -> ProcessingJob:
+    """
+    Create a new processing job.
+
+    Args:
+        document_id: Reference to the file document
+        task_id: Optional Celery task UUID
+
+    Returns:
+        The created ProcessingJob
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    return self.repository.create_job(document_id, task_id)
+  
+  def get_job_by_id(self, job_id: PyObjectId) -> ProcessingJob:
+    """
+    Retrieve a job by its ID.
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        The ProcessingJob document
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        JobRepositoryError: If database operation fails
+    """
+    return self.repository.find_job_by_id(job_id)
+  
+  def mark_job_as_started(self, job_id: PyObjectId) -> ProcessingJob:
+    """
+    Mark a job as started (PENDING → PROCESSING).
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        The updated ProcessingJob
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        InvalidStatusTransitionError: If job is not in PENDING status
+        JobRepositoryError: If database operation fails
+    """
+    # Get current job to validate transition
+    current_job = self.repository.find_job_by_id(job_id)
+    
+    # Validate status transition
+    if current_job.status != ProcessingStatus.PENDING:
+      raise InvalidStatusTransitionError(current_job.status, ProcessingStatus.PROCESSING)
+    
+    # Update status
+    return self.repository.update_job_status(job_id, ProcessingStatus.PROCESSING)
+  
+  def mark_job_as_completed(self, job_id: PyObjectId) -> ProcessingJob:
+    """
+    Mark a job as completed (PROCESSING → COMPLETED).
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        The updated ProcessingJob
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        InvalidStatusTransitionError: If job is not in PROCESSING status
+        JobRepositoryError: If database operation fails
+    """
+    # Get current job to validate transition
+    current_job = self.repository.find_job_by_id(job_id)
+    
+    # Validate status transition
+    if current_job.status in (ProcessingStatus.PENDING,
+                              ProcessingStatus.COMPLETED,
+                              ProcessingStatus.FAILED):
+      raise InvalidStatusTransitionError(current_job.status, ProcessingStatus.COMPLETED)
+    
+    # Update status
+    return self.repository.update_job_status(job_id, ProcessingStatus.COMPLETED)
+  
+  def mark_job_as_failed(
+      self,
+      job_id: PyObjectId,
+      error_message: Optional[str] = None
+  ) -> ProcessingJob:
+    """
+    Mark a job as failed (PROCESSING → FAILED).
+
+    Args:
+        job_id: The job ObjectId
+        error_message: Optional error description
+
+    Returns:
+        The updated ProcessingJob
+
+    Raises:
+        JobNotFoundError: If job doesn't exist
+        InvalidStatusTransitionError: If job is not in PROCESSING status
+        JobRepositoryError: If database operation fails
+    """
+    # Get current job to validate transition
+    current_job = self.repository.find_job_by_id(job_id)
+    
+    # Validate status transition
+    if current_job.status in (ProcessingStatus.PENDING, ProcessingStatus.COMPLETED, ProcessingStatus.FAILED):
+      raise InvalidStatusTransitionError(current_job.status, ProcessingStatus.FAILED)
+    
+    # Update status with error message
+    return self.repository.update_job_status(
+      job_id,
+      ProcessingStatus.FAILED,
+      error_message
+    )
+  
+  def update_job_status(self, job_id: PyObjectId,
+                        status: ProcessingStatus,
+                        error_message: str = None) -> ProcessingJob:
+    return self.repository.update_job_status(job_id, status, error_message)
+  
+  def delete_job(self, job_id: PyObjectId) -> bool:
+    """
+    Delete a job from the database.
+
+    Args:
+        job_id: The job ObjectId
+
+    Returns:
+        True if job was deleted, False if not found
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    return self.repository.delete_job(job_id)
+  
+  def get_jobs_by_status(self, status: ProcessingStatus) -> list[ProcessingJob]:
+    """
+    Retrieve all jobs with a specific status.
+
+    Args:
+        status: The processing status to filter by
+
+    Returns:
+        List of ProcessingJob documents
+
+    Raises:
+        JobRepositoryError: If database operation fails
+    """
+    return self.repository.get_jobs_by_status(status)

src/file-processor/app/services/user_service.py

@@ -0,0 +1,201 @@
+"""
+User service for business logic operations.
+
+This module provides user-related business logic including user creation,
+retrieval, updates, and authentication operations with proper error handling.
+"""
+
+from typing import Optional, List
+
+from pymongo.errors import DuplicateKeyError
+
+from app.database.repositories.user_repository import UserRepository
+from app.models.user import UserCreate, UserInDB, UserUpdate, UserCreateNoValidation
+from app.services.auth_service import AuthService
+
+
+class UserService:
+  """
+  Service class for user business logic operations.
+
+  This class handles user-related operations including creation,
+  authentication, and data management with proper validation.
+  """
+  
+  def __init__(self, database):
+    """
+    Initialize user service with repository dependency.
+
+    Args:
+        user_repository (UserRepository): Repository for user data operations
+    """
+    self.db = database
+    self.user_repository = UserRepository(self.db)
+    self.auth_service = AuthService()
+  
+  def initialize(self):
+    self.user_repository.initialize()
+    return self
+  
+  def create_user(self, user_data: UserCreate | UserCreateNoValidation) -> UserInDB:
+    """
+    Create a new user with business logic validation.
+
+    Args:
+        user_data (UserCreate): User creation data
+
+    Returns:
+        UserInDB: Created user with database information
+
+    Raises:
+        ValueError: If user already exists or validation fails
+    """
+    # Check if user already exists
+    if self.user_repository.user_exists(user_data.username):
+      raise ValueError(f"User with username '{user_data.username}' already exists")
+    
+    # Check if email already exists
+    existing_user = self.user_repository.find_user_by_email(user_data.email)
+    if existing_user:
+      raise ValueError(f"User with email '{user_data.email}' already exists")
+    
+    try:
+      return self.user_repository.create_user(user_data)
+    except DuplicateKeyError:
+      raise ValueError(f"User with username '{user_data.username}' already exists")
+  
+  def get_user_by_username(self, username: str) -> Optional[UserInDB]:
+    """
+    Retrieve user by username.
+
+    Args:
+        username (str): Username to search for
+
+    Returns:
+        UserInDB or None: User if found, None otherwise
+    """
+    return self.user_repository.find_user_by_username(username)
+  
+  def get_user_by_id(self, user_id: str) -> Optional[UserInDB]:
+    """
+    Retrieve user by ID.
+
+    Args:
+        user_id (str): User ID to search for
+
+    Returns:
+        UserInDB or None: User if found, None otherwise
+    """
+    return self.user_repository.find_user_by_id(user_id)
+  
+  def authenticate_user(self, username: str, password: str) -> Optional[UserInDB]:
+    """
+    Authenticate user with username and password.
+
+    Args:
+        username (str): Username for authentication
+        password (str): Password for authentication
+
+    Returns:
+        UserInDB or None: Authenticated user if valid, None otherwise
+    """
+    user = self.user_repository.find_user_by_username(username)
+    if not user:
+      return None
+    
+    if not user.is_active:
+      return None
+    
+    if not self.auth_service.verify_user_password(password, user.hashed_password):
+      return None
+    
+    return user
+  
+  def update_user(self, user_id: str, user_update: UserUpdate) -> Optional[UserInDB]:
+    """
+    Update user information.
+
+    Args:
+        user_id (str): User ID to update
+        user_update (UserUpdate): Updated user data
+
+    Returns:
+        UserInDB or None: Updated user if successful, None otherwise
+
+    Raises:
+        ValueError: If username or email already exists for different user
+    """
+    # Validate username uniqueness if being updated
+    if user_update.username is not None:
+      existing_user = self.user_repository.find_user_by_username(user_update.username)
+      if existing_user and str(existing_user.id) != user_id:
+        raise ValueError(f"Username '{user_update.username}' is already taken")
+    
+    # Validate email uniqueness if being updated
+    if user_update.email is not None:
+      existing_user = self.user_repository.find_user_by_email(user_update.email)
+      if existing_user and str(existing_user.id) != user_id:
+        raise ValueError(f"Email '{user_update.email}' is already taken")
+    
+    return self.user_repository.update_user(user_id, user_update)
+  
+  def delete_user(self, user_id: str) -> bool:
+    """
+    Delete user from system.
+
+    Args:
+        user_id (str): User ID to delete
+
+    Returns:
+        bool: True if user was deleted, False otherwise
+    """
+    return self.user_repository.delete_user(user_id)
+  
+  def list_users(self, skip: int = 0, limit: int = 100) -> List[UserInDB]:
+    """
+    List users with pagination.
+
+    Args:
+        skip (int): Number of users to skip (default: 0)
+        limit (int): Maximum number of users to return (default: 100)
+
+    Returns:
+        List[UserInDB]: List of users
+    """
+    return self.user_repository.list_users(skip=skip, limit=limit)
+  
+  def count_users(self) -> int:
+    """
+    Count total number of users.
+
+    Returns:
+        int: Total number of users in system
+    """
+    return self.user_repository.count_users()
+  
+  def user_exists(self, username: str) -> bool:
+    """
+    Check if user exists by username.
+
+    Args:
+        username (str): Username to check
+
+    Returns:
+        bool: True if user exists, False otherwise
+    """
+    return self.user_repository.user_exists(username)
+  
+  def get_preference(self, user_id: str, preference):
+    user = self.get_user_by_id(user_id)
+    if user is None:
+      return None
+    return user.preferences.get(preference, None)
+  
+  def set_preference(self, user_id: str, preference, value):
+    user = self.get_user_by_id(user_id)
+    if user is None:
+      return None
+    
+    user.preferences[preference] = value
+    self.user_repository.update_user(user_id, UserUpdate(preferences=user.preferences))
+    return self.get_user_by_id(user_id)

src/file-processor/app/utils/document_matching.py

@@ -0,0 +1,60 @@
+from difflib import SequenceMatcher
+
+from app.models.document import FileDocument
+
+
+def _is_subsequence(query: str, target: str) -> tuple[bool, float]:
+  """
+  Check if query is a subsequence of target (case-insensitive).
+  Returns (match, score).
+  Score is higher when the query letters are closer together in the target.
+  """
+  query = query.lower()
+  target = target.lower()
+  
+  positions = []
+  idx = 0
+  
+  for char in query:
+    idx = target.find(char, idx)
+    if idx == -1:
+      return False, 0.0
+    positions.append(idx)
+    idx += 1
+  
+  # Smallest window containing all matched chars
+  window_size = positions[-1] - positions[0] + 1
+  
+  # Score: ratio of query length vs window size (compactness)
+  score = len(query) / window_size
+  
+  return True, score
+
+def fuzzy_matching(filename: str, documents: list[FileDocument], similarity_threshold: float = 0.7):
+  matches = []
+  for file_doc in documents:
+    # Calculate similarity between search term and filename
+    similarity = SequenceMatcher(None, filename.lower(), file_doc.filename.lower()).ratio()
+    
+    if similarity >= similarity_threshold:
+      matches.append((file_doc, similarity))
+  
+  # Sort by similarity score (highest first)
+  matches.sort(key=lambda x: x[1], reverse=True)
+  
+  # Return only the FileDocument objects
+  return [match[0] for match in matches]
+  
+
+def subsequence_matching(query: str, documents: list[FileDocument]):
+  matches = []
+  for file_doc in documents:
+    matched, score = _is_subsequence(query, file_doc.filename)
+    if matched:
+      matches.append((file_doc, score))
+  
+  # Sort by score (highest first)
+  matches.sort(key=lambda x: x[1], reverse=True)
+  
+  # Return only the FileDocument objects
+  return [match[0] for match in matches]

src/file-processor/app/utils/pdf_annotation.py

@@ -0,0 +1,241 @@
+import fitz  # PyMuPDF
+
+
+class PDFAnnotator:
+  def __init__(self, pdf_path):
+    self.doc = fitz.open(pdf_path)
+  
+  def add_highlight(self, rect, page_num=0, color=(1, 1, 0)):
+    """
+    Add highlight annotation
+
+    Args:
+        rect: (x0, y0, x1, y1) coordinates or fitz.Rect object
+        page_num: Page number (0-indexed), default first page
+        color: RGB tuple (0-1 range), default yellow
+    """
+    page = self.doc[page_num]
+    annot = page.add_highlight_annot(rect)
+    annot.set_colors(stroke=color)
+    annot.update()
+    return annot
+  
+  def add_rectangle(self, rect, page_num=0, color=(1, 0, 0), width=2):
+    """
+    Add rectangle annotation (border only)
+
+    Args:
+        rect: (x0, y0, x1, y1) coordinates or fitz.Rect object
+        page_num: Page number (0-indexed), default first page
+        color: RGB tuple (0-1 range), default red
+        width: Line width in points
+    """
+    page = self.doc[page_num]
+    annot = page.add_rect_annot(rect)
+    annot.set_colors(stroke=color)
+    annot.set_border(width=width)
+    annot.update()
+    return annot
+  
+  def add_text_note(self, point, text, page_num=0, icon="Note"):
+    """
+    Add sticky note annotation
+
+    Args:
+        point: (x, y) position tuple
+        text: Note content string
+        page_num: Page number (0-indexed), default first page
+        icon: "Note", "Comment", "Help", "Insert", "Key", etc.
+    """
+    page = self.doc[page_num]
+    annot = page.add_text_annot(point, text, icon=icon)
+    annot.update()
+    return annot
+  
+  def add_free_text(self, rect, text, page_num=0, fontsize=12,
+                    color=(0, 0, 0)):
+    """
+    Add free text annotation (visible text box)
+
+    Args:
+        rect: (x0, y0, x1, y1) bounding box tuple or fitz.Rect
+        text: Text content string
+        page_num: Page number (0-indexed), default first page
+        fontsize: Font size in points
+        color: Text color RGB tuple (0-1 range)
+    """
+    page = self.doc[page_num]
+    annot = page.add_freetext_annot(
+      rect,
+      text,
+      fontsize=fontsize,
+      text_color=color
+    )
+    annot.update()
+    return annot
+  
+  def add_arrow(self, start_point, end_point, page_num=0,
+                color=(1, 0, 0), width=2):
+    """
+    Add arrow annotation
+
+    Args:
+        start_point: (x, y) tuple for arrow start
+        end_point: (x, y) tuple for arrow end
+        page_num: Page number (0-indexed), default first page
+        color: Arrow color RGB tuple (0-1 range), default red
+        width: Line width in points
+    """
+    page = self.doc[page_num]
+    annot = page.add_line_annot(start_point, end_point)
+    annot.set_colors(stroke=color)
+    annot.set_border(width=width)
+    # Set arrow at end - use integer constant
+    annot.set_line_ends(0, 1)  # 1 = ClosedArrow
+    annot.update()
+    return annot
+  
+  def add_stamp(self, rect, page_num=0, stamp_type=0):
+    """
+    Add stamp annotation
+
+    Args:
+        rect: (x0, y0, x1, y1) bounding box tuple or fitz.Rect
+        page_num: Page number (0-indexed), default first page
+        stamp_type: Integer for stamp type:
+                   0=Approved, 1=AsIs, 2=Confidential,
+                   3=Departmental, 4=Draft, 5=Experimental,
+                   6=Expired, 7=Final, 8=ForComment,
+                   9=ForPublicRelease, 10=NotApproved, etc.
+    """
+    page = self.doc[page_num]
+    annot = page.add_stamp_annot(rect, stamp=stamp_type)
+    annot.update()
+    return annot
+  
+  def add_redaction(self, rect, page_num=0, fill_color=(0, 0, 0)):
+    """
+    Add redaction annotation (marks area for redaction)
+    Note: Use apply_redactions() to permanently remove content
+
+    Args:
+        rect: (x0, y0, x1, y1) area to redact, tuple or fitz.Rect
+        page_num: Page number (0-indexed), default first page
+        fill_color: RGB tuple (0-1 range) for redacted area, default black
+    """
+    page = self.doc[page_num]
+    annot = page.add_redact_annot(rect, fill=fill_color)
+    annot.update()
+    return annot
+  
+  def apply_redactions(self, page_num=0, images=2, graphics=2, text=2):
+    """
+    Apply all redaction annotations on a page (permanent removal)
+
+    Args:
+        page_num: Page number (0-indexed), default first page
+        images: 2=remove, 1=blank, 0=ignore
+        graphics: 2=remove, 1=blank, 0=ignore
+        text: 2=remove, 1=blank, 0=ignore
+
+    Returns:
+        True if redactions were applied, False otherwise
+    """
+    page = self.doc[page_num]
+    # Check if page has redaction annotations
+    has_redactions = any(annot.type[0] == 12 for annot in page.annots())
+    
+    if has_redactions:
+      page.apply_redactions(images=images, graphics=graphics, text=text)
+      return True
+    return False
+  
+  def get_all_annotations(self, page_num=0):
+    """
+    Retrieve all annotations from a page
+
+    Args:
+        page_num: Page number (0-indexed), default first page
+
+    Returns:
+        List of dicts with annotation information
+    """
+    page = self.doc[page_num]
+    annotations = []
+    
+    for annot in page.annots():
+      info = {
+          'type': annot.type[1],  # Annotation type name
+          'rect': annot.rect,
+          'content': annot.info.get('content', ''),
+          'author': annot.info.get('title', ''),
+          'created': annot.info.get('creationDate', ''),
+          'colors': annot.colors
+      }
+      annotations.append(info)
+    
+    return annotations
+  
+  def remove_all_annotations(self, page_num=0):
+    """
+    Remove all annotations from a page
+
+    Args:
+        page_num: Page number (0-indexed), default first page
+    """
+    page = self.doc[page_num]
+    for annot in page.annots():
+      page.delete_annot(annot)
+  
+  def save(self, output_path):
+    """Save the annotated PDF"""
+    self.doc.save(output_path)
+  
+  def close(self):
+    self.doc.close()
+  
+  def __enter__(self):
+    return self
+  
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self.close()
+
+
+# Example usage
+if __name__ == "__main__":
+  with PDFAnnotator("input.pdf") as annotator:
+    # Add yellow highlight
+    annotator.add_highlight((100, 100, 300, 120), page_num=0,
+                            color=(1, 1, 0))
+    
+    # Add red rectangle border
+    annotator.add_rectangle((100, 150, 300, 250), page_num=0,
+                            color=(1, 0, 0), width=3)
+    
+    # Add sticky note
+    annotator.add_text_note((400, 100), "This is important!",
+                            page_num=0, icon="Comment")
+    
+    # Add visible text box
+    annotator.add_free_text((100, 300, 400, 350), "DRAFT VERSION",
+                            page_num=0, fontsize=20, color=(1, 0, 0))
+    
+    # Add arrow pointing to something
+    annotator.add_arrow((450, 100), (500, 200), page_num=0,
+                        color=(0, 0, 1), width=2)
+    
+    # Add "Approved" stamp
+    annotator.add_stamp((450, 300, 550, 350), page_num=0, stamp_type=0)
+    
+    # Add redaction (black box over sensitive info)
+    annotator.add_redaction((100, 400, 300, 420), page_num=0)
+    annotator.apply_redactions(page_num=0)
+    
+    # List all annotations
+    annots = annotator.get_all_annotations(page_num=0)
+    print(f"Found {len(annots)} annotations:")
+    for a in annots:
+      print(f"  - {a['type']} at {a['rect']}")
+    
+    # Save annotated PDF
+    annotator.save("output_annotated.pdf")

src/file-processor/app/utils/pdf_converter.py

@@ -0,0 +1,210 @@
+import datetime
+import hashlib
+import os
+import uuid
+from abc import ABC
+from pathlib import Path
+from typing import Self
+
+import pikepdf
+import pypandoc
+from PIL import Image
+from reportlab.lib.pagesizes import A4
+from reportlab.pdfgen import canvas
+
+from tasks.common.converter_utils import detect_file_type
+
+
+class BaseConverter(ABC):
+  """Abstract base class for file converters to PDF."""
+  
+  def __init__(self, input_path: str, output_dir: str = ".") -> None:
+    self.input_path = Path(input_path)
+    self.output_dir = Path(output_dir)
+    self.output_path = self.output_dir / f"{self.generate_uuid_filename()}.pdf"
+  
+  def convert(self) -> Self:
+    """Convert input file to PDF and return the output path."""
+    pass
+  
+  @staticmethod
+  def generate_uuid_filename() -> str:
+    """Generate a unique filename using UUID4."""
+    return str(uuid.uuid4())
+  
+  def get_deterministic_date(self) -> str:
+    """
+    Generate a deterministic date based on file content.
+    This ensures the same file always produces the same PDF.
+    """
+    # Option 1: Use a fixed date
+    # return "D:20000101000000"
+    
+    # Option 2: Generate date from content hash (recommended)
+    with open(self.input_path, 'rb') as f:
+      content = f.read()
+      content_hash = hashlib.sha256(content).hexdigest()
+    
+    # Use first 14 characters of hash to create a valid date
+    # Format: D:YYYYMMDDHHmmss
+    hash_int = int(content_hash[:14], 16)
+    
+    # Create a date between 2000-2099 to keep it reasonable
+    year = 2000 + (hash_int % 100)
+    month = 1 + (hash_int % 12)
+    day = 1 + (hash_int % 28)  # Stay safe with 28 days
+    hour = hash_int % 24
+    minute = hash_int % 60
+    second = hash_int % 60
+    
+    return f"D:{year:04d}{month:02d}{day:02d}{hour:02d}{minute:02d}{second:02d}"
+  
+  def get_file_creation_date(self):
+    # Get file creation time (or modification time)
+    ts = os.path.getctime(self.input_path)  # getmtime(self.input_path) for last modification
+    dt = datetime.datetime.fromtimestamp(ts)
+    
+    # PDF expects format D:YYYYMMDDHHmmss
+    creation_date = dt.strftime("D:%Y%m%d%H%M%S")
+    return creation_date
+  
+  def clean_pdf(self) -> Self:
+    """Remove all non-deterministic metadata from PDF."""
+    with pikepdf.open(self.output_path, allow_overwriting_input=True) as pdf:
+      # Remove XMP metadata if it exists
+      if hasattr(pdf.Root, 'Metadata'):
+        del pdf.Root.Metadata
+        
+        # Clear all document info by deleting each key
+        for key in list(pdf.docinfo.keys()):
+          del pdf.docinfo[key]
+      
+      # Set deterministic metadata
+      pdf.docinfo["/Producer"] = "MyConverter"
+      pdf.docinfo["/Creator"] = "MyConverter"
+      pdf.docinfo["/CreationDate"] = self.get_deterministic_date()
+      pdf.docinfo["/ModDate"] = self.get_deterministic_date()
+      pdf.docinfo["/Title"] = self.input_path.name
+      
+      # Save with deterministic IDs
+      # compress=True ensures consistent compression
+      # deterministic_id=True (if available) or static_id=True
+      pdf.save(
+        self.output_path,
+        fix_metadata_version=True,
+        compress_streams=True,
+        stream_decode_level=pikepdf.StreamDecodeLevel.generalized,
+        object_stream_mode=pikepdf.ObjectStreamMode.disable,
+        deterministic_id=True  # Use this if pikepdf >= 8.0.0, otherwise use static_id=True
+      )
+    
+    return self
+
+
+class TextToPdfConverter(BaseConverter):
+  """Converter for text files to PDF."""
+  
+  def convert(self) -> Self:
+    c = canvas.Canvas(str(self.output_path), pagesize=A4)
+    
+    # Fix metadata with deterministic values
+    info = c._doc.info
+    info.producer = "MyConverter"
+    info.creationDate = self.get_file_creation_date()
+    info.title = os.path.basename(self.input_path)
+    
+    width, height = A4
+    with open(self.input_path, "r", encoding="utf-8") as f:
+      y = height - 50
+      for line in f:
+        c.drawString(50, y, line.strip())
+        y -= 15
+        if y < 50:
+          c.showPage()
+          y = height - 50
+    
+    c.save()
+    return self
+
+
+class PdfToPdfConverter(BaseConverter):
+  """Converter for PDF files to PDF."""
+  
+  def convert(self) -> Self:
+    # copy self.input_path to self.output_path
+    os.system(f"cp {self.input_path} {self.output_path}")
+    return self
+
+
+class ImageToPdfConverter(BaseConverter):
+  """Converter for image files to PDF."""
+  
+  def convert(self) -> Self:
+    image = Image.open(self.input_path)
+    rgb_image = image.convert("RGB")
+    rgb_image.save(self.output_path)
+    return self
+
+
+class WordToPdfConverter(BaseConverter):
+  """Converter for Word files (.docx) to PDF using pypandoc."""
+  
+  def convert(self) -> Self:
+    pypandoc.convert_file(
+      str(self.input_path), "pdf", outputfile=str(self.output_path)
+    )
+    return self
+
+
+# Placeholders for future extensions
+class HtmlToPdfConverter(BaseConverter):
+  """Placeholder for HTML to PDF converter."""
+  
+  def convert(self) -> Self:
+    raise NotImplementedError("HTML to PDF conversion not implemented.")
+
+
+class ExcelToPdfConverter(BaseConverter):
+  """Placeholder for Excel to PDF converter."""
+  
+  def convert(self) -> Self:
+    raise NotImplementedError("Excel to PDF conversion not implemented.")
+
+
+class MarkdownToPdfConverter(BaseConverter):
+  """Placeholder for Markdown to PDF converter."""
+  
+  def convert(self) -> Self:
+    raise NotImplementedError("Markdown to PDF conversion not implemented.")
+
+
+def convert_to_pdf(filepath: str, output_dir: str = ".") -> str:
+  """
+      Convert any supported file to PDF.
+
+      Args:
+          filepath (str): Path to the input file.
+          output_dir (str): Directory to save the output PDF.
+
+      Returns:
+          str: Path to the generated PDF.
+
+      Raises:
+          UnsupportedFileTypeError: If the input file type is not supported.
+      """
+  file_type = detect_file_type(filepath)
+  
+  if file_type == "text":
+    converter = TextToPdfConverter(filepath, output_dir=output_dir)
+  elif file_type == "image":
+    converter = ImageToPdfConverter(filepath, output_dir=output_dir)
+  elif file_type == "word":
+    converter = WordToPdfConverter(filepath, output_dir=output_dir)
+  elif file_type == "pdf":
+    converter = PdfToPdfConverter(filepath, output_dir=output_dir)
+  else:
+    raise ValueError(f"Unsupported file type: {file_type}")
+  
+  converter.convert()
+  converter.clean_pdf()
+  return str(converter.output_path)

src/file-processor/app/utils/pdf_thumbmail.py

@@ -0,0 +1,167 @@
+from pathlib import Path
+
+import fitz  # PyMuPDF
+
+
+class PDFThumbnailGenerator:
+  def __init__(self, pdf_path):
+    """
+    Initialize PDF thumbnail generator
+
+    Args:
+        pdf_path: Path to the PDF file (string or Path object)
+    """
+    self.pdf_path = pdf_path
+    self.doc = fitz.open(pdf_path)
+  
+  def create_thumbnail(self, output_path, page_num=0, width=200, rotation=0, zoom_factor=1.0):
+    """
+    Create a thumbnail with zoom and rotation
+
+    Args:
+        output_path: Path to save the thumbnail (string or Path)
+        page_num: Page number (0-indexed), default first page
+        width: Desired width in pixels, default 200
+        rotation: Rotation angle in degrees (0, 90, 180, 270), default 0
+        zoom_factor: Additional zoom multiplier (1.0 = normal, 2.0 = 2x), default 1.0
+
+    Returns:
+        Dict with thumbnail info (width, height, rotation, zoom)
+    """
+    page = self.doc[page_num]
+    
+    # Apply rotation to page
+    page.set_rotation(rotation)
+    
+    # Calculate zoom to achieve desired width
+    base_zoom = width / page.rect.width
+    final_zoom = base_zoom * zoom_factor
+    
+    # Create transformation matrix
+    mat = fitz.Matrix(final_zoom, final_zoom)
+    
+    # Render page to pixmap
+    pix = page.get_pixmap(matrix=mat, alpha=False)
+    
+    # Save thumbnail
+    pix.save(output_path)
+    
+    return {
+        'width': pix.width,
+        'height': pix.height,
+        'rotation': rotation,
+        'zoom': zoom_factor
+    }
+  
+  def create_cropped_thumbnail(self, output_path, crop_rect=None, page_num=0, width=200):
+    """
+    Create a thumbnail of a specific region (zoom on area)
+
+    Args:
+        output_path: Path to save the thumbnail (string or Path)
+        crop_rect: Tuple (x0, y0, x1, y1) in PDF coordinates for cropping,
+                  or None for full page, default None
+        page_num: Page number (0-indexed), default first page
+        width: Desired width in pixels, default 200
+
+    Returns:
+        Tuple (width, height) of the generated thumbnail
+    """
+    page = self.doc[page_num]
+    
+    if crop_rect:
+      # Create rectangle for cropping
+      rect = fitz.Rect(crop_rect)
+      zoom = width / rect.width
+    else:
+      rect = page.rect
+      zoom = width / page.rect.width
+    
+    mat = fitz.Matrix(zoom, zoom)
+    
+    # Render only the specified rectangle
+    pix = page.get_pixmap(matrix=mat, clip=rect)
+    pix.save(output_path)
+    
+    return pix.width, pix.height
+  
+  def get_page_info(self, page_num=0):
+    """
+    Get information about a specific page
+
+    Args:
+        page_num: Page number (0-indexed), default first page
+
+    Returns:
+        Dict with page information (width, height, rotation, number, total_pages)
+    """
+    page = self.doc[page_num]
+    return {
+        'width': page.rect.width,
+        'height': page.rect.height,
+        'rotation': page.rotation,
+        'number': page_num + 1,
+        'total_pages': len(self.doc)
+    }
+  
+  def create_multi_resolution_thumbnails(self, output_folder, page_num=0, sizes=(150, 300, 600)):
+    """
+    Create multiple thumbnails at different resolutions
+
+    Args:
+        output_folder: Folder path to save thumbnails (string or Path)
+        page_num: Page number (0-indexed), default first page
+        sizes: List of widths in pixels, default [150, 300, 600]
+
+    Returns:
+        Dict mapping each size to thumbnail info
+    """
+    output_folder = Path(output_folder)
+    output_folder.mkdir(exist_ok=True, parents=True)
+    
+    results = {}
+    for size in sizes:
+      output_path = output_folder / f"thumb_{size}px.png"
+      info = self.create_thumbnail(output_path, page_num=page_num, width=size)
+      results[size] = info
+    
+    return results
+  
+  def close(self):
+    """Close the PDF document and free resources"""
+    self.doc.close()
+  
+  def __enter__(self):
+    return self
+  
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self.close()
+
+
+# Example usage
+if __name__ == "__main__":
+  # Basic usage with context manager
+  with PDFThumbnailGenerator("example.pdf") as gen:
+    # Standard thumbnail
+    gen.create_thumbnail("thumb_standard.png", page_num=0, width=200)
+    
+    # Rotated thumbnail
+    gen.create_thumbnail("thumb_rotated.png", page_num=0,
+                         width=200, rotation=90)
+    
+    # Zoomed thumbnail (2x zoom)
+    gen.create_thumbnail("thumb_zoomed.png", page_num=0,
+                         width=200, zoom_factor=2.0)
+    
+    # Cropped/zoomed on specific area (x0, y0, x1, y1)
+    gen.create_cropped_thumbnail("thumb_crop.png",
+                                 crop_rect=(100, 100, 400, 400),
+                                 page_num=0, width=300)
+    
+    # Multiple resolutions
+    gen.create_multi_resolution_thumbnails("thumbnails/", page_num=0,
+                                           sizes=[150, 300, 600])
+    
+    # Get page information
+    info = gen.get_page_info(page_num=0)
+    print(f"Page info: {info}")

src/file-processor/app/utils/security.py

@@ -4,9 +4,10 @@ Password security utilities using bcrypt for secure password hashing.
 This module provides secure password hashing and verification functions
 using the bcrypt algorithm with automatic salt generation.
 """
+import re
+import uuid
 
 import bcrypt
-from typing import Union
 
 
 def hash_password(password: str) -> str:
@@ -72,3 +73,32 @@ def verify_password(password: str, hashed_password: str) -> bool:
     raise RuntimeError(f"Invalid hash format: {str(e)}")
   except Exception as e:
     raise RuntimeError(f"Failed to verify password: {str(e)}")
+
+
+def generate_uuid_filename() -> str:
+  """Generate a unique filename using UUID4."""
+  return str(uuid.uuid4())
+
+
+def safe_connection_string(connection_string: str) -> str:
+  """
+  Mask the password in a MongoDB connection string.
+
+  Args:
+      connection_string (str): The complete MongoDB connection string
+
+  Returns:
+      str: The connection string with password replaced by asterisks
+
+  Example:
+      >>> mask_mongodb_password("mongodb://admin:password123@mongodb:27017/mydocmanager?authSource=admin")
+      "mongodb://admin:***@mongodb:27017/mydocmanager?authSource=admin"
+  """
+  # Pattern to detect password in MongoDB URL
+  # Format: mongodb://username:password@host:port/database
+  pattern = r'(mongodb://[^:]+:)([^@]+)(@.*)'
+  
+  # Replace password with asterisks
+  masked_string = re.sub(pattern, r'\1*****\3', connection_string)
+  
+  return masked_string

src/file-processor/requirements.txt

@@ -1,6 +1,20 @@
-fastapi==0.116.1
-uvicorn==0.35.0
+asgiref==3.9.1
+bcrypt==4.3.0
 celery==5.5.3
-redis==6.4.0
-pymongo==4.15.0
+email-validator==2.3.0
+fastapi==0.116.1
+httptools==0.6.4
+motor==3.7.1
+pikepdf==9.11.0
+pillow==11.3.0
 pydantic==2.11.9
+PyJWT==2.10.1
+pymongo==4.15.0
+PyMuPDF==1.26.4
+pypandoc==1.15
+python-multipart==0.0.20
+redis==6.4.0
+reportlab==4.4.4
+uvicorn==0.35.0
+python-magic==0.4.27
+watchdog==6.0.0

src/frontend/.dockerignore

@@ -0,0 +1,41 @@
+# Dependencies
+node_modules
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build outputs
+dist
+build
+
+# Environment files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# IDE files
+.vscode
+.idea
+*.swp
+*.swo
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Git
+.git
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+
+# Logs
+*.log

src/frontend/Dockerfile

@@ -0,0 +1,20 @@
+# Use Node.js 20 Alpine for lightweight container
+FROM node:20-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package.json and package-lock.json (if available)
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code
+COPY . .
+
+# Expose Vite default port
+EXPOSE 5173
+
+# Start development server with host 0.0.0.0 to accept external connections
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0", "--port", "5173"]

src/frontend/README.md

@@ -1,12 +1,93 @@
-# React + Vite
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+# MyDocManager Frontend
 
-Currently, two official plugins are available:
+## Overview
+MyDocManager Frontend is a modern web application built with React and Vite that serves as the user interface for the MyDocManager document management system. The application provides a seamless experience for users to manage, process, and organize their documents with an intuitive and responsive interface.
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+## Project Structure
+frontend/
+├── public/                  # Public assets and static files
+├── src/                     # Source code
+│   ├── assets/             # Icons, images, and other static assets
+│   ├── components/         # Reusable UI components
+│   │   ├── auth/          # Authentication-related components
+│   │   └── common/        # Shared components (Header, Layout, etc.)
+│   ├── contexts/          # React contexts for state management
+│   ├── hooks/             # Custom React hooks
+│   ├── pages/             # Page components representing full views
+│   ├── services/          # API service interfaces
+│   └── utils/             # Utility functions and helpers
+├── Dockerfile             # Container configuration for deployment
+├── package.json           # Dependencies and scripts
+├── tailwind.config.js     # Tailwind CSS configuration
+└── vite.config.js         # Vite bundler configuration
 
-## Expanding the ESLint configuration
 
-If you are developing a production application, we recommend using TypeScript with type-aware lint rules enabled. Check out the [TS template](https://github.com/vitejs/vite/tree/main/packages/create-vite/template-react-ts) for information on how to integrate TypeScript and [`typescript-eslint`](https://typescript-eslint.io) in your project.
+
+## Key Components
+
+### Authentication
+- **AuthContext**: Provides authentication state and methods throughout the application
+- **AuthLayout**: Layout wrapper specifically for authentication screens
+- **LoginForm**: Form component for user authentication
+- **ProtectedRoute**: Route guard that ensures authenticated access to protected pages
+
+### UI Components
+- **Layout**: Main application layout structure with menu and content areas
+- **Header**: Application header with navigation and user controls
+- **Menu**: Side navigation menu with application links
+- **ThemeSwitcher**: Toggle for switching between light and dark themes
+
+### Pages
+- **LoginPage**: User authentication page
+- **DashboardPage**: Main dashboard view for authenticated users
+
+### Services
+- **authService**: Handles API communication for authentication operations
+- **api**: Base API utility for making HTTP requests to the backend
+
+## Getting Started
+
+### Prerequisites
+- Node.js (latest LTS version)
+- npm or yarn package manager
+
+### Installation
+1. Clone the repository
+2. Navigate to the frontend directory
+3. Install dependencies:
+```
+npm install
+```
+
+### Development
+Run the development server:
+```
+npm run dev
+```
+This will start the application in development mode at http://localhost:5173
+
+### Building for Production
+Create a production build:
+```
+npm run build
+```
+
+
+## Technologies
+- React 19.1.1
+- Vite 7.1.2
+- Tailwind CSS 4.1.13
+- DaisyUI 5.1.24
+- React Router 7.9.3
+- Axios for API requests
+
+## Features
+- Responsive design with Tailwind CSS
+- Authentication and authorization
+- Light/dark theme support
+- Document management interface
+- Secure API communication
+
+## Project Integration
+This frontend application works in conjunction with the backend services and workers defined in other parts of the MyDocManager project to provide a complete document management solution.

src/frontend/index.html

@@ -1,10 +1,10 @@
 <!doctype html>
-<html lang="en">
+<html lang="en" data-theme="dark">
   <head>
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Vite + React</title>
+    <title>My Documents Manager</title>
   </head>
   <body>
     <div id="root"></div>

src/frontend/package.json

@@ -10,18 +10,26 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@tailwindcss/vite": "^4.1.13",
+    "axios": "^1.12.2",
     "react": "^19.1.1",
-    "react-dom": "^19.1.1"
+    "react-dom": "^19.1.1",
+    "react-icons": "^5.5.0",
+    "react-router-dom": "^7.9.3"
   },
   "devDependencies": {
     "@eslint/js": "^9.33.0",
     "@types/react": "^19.1.10",
     "@types/react-dom": "^19.1.7",
     "@vitejs/plugin-react": "^5.0.0",
+    "autoprefixer": "^10.4.21",
+    "daisyui": "^5.1.24",
     "eslint": "^9.33.0",
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.20",
     "globals": "^16.3.0",
+    "postcss": "^8.5.6",
+    "tailwindcss": "^4.1.13",
     "vite": "^7.1.2"
   }
 }

src/frontend/src/App.css

@@ -1,42 +1,6 @@
+@import "tailwindcss";
+
 #root {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
-}
-
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
-}
-.logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
-}
-.logo.react:hover {
-  filter: drop-shadow(0 0 2em #61dafbaa);
-}
-
-@keyframes logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  a:nth-of-type(2) .logo {
-    animation: logo-spin infinite 20s linear;
-  }
-}
-
-.card {
-  padding: 2em;
-}
-
-.read-the-docs {
-  color: #888;
+    max-width: 1280px;
+    margin: 0 auto;
 }

src/frontend/src/App.jsx

@@ -1,35 +1,36 @@
-import { useState } from 'react'
-import reactLogo from './assets/react.svg'
-import viteLogo from '/vite.svg'
-import './App.css'
+import { BrowserRouter as Router, Routes, Route, Navigate } from 'react-router-dom';
+import { AuthProvider } from './contexts/AuthContext';
+import ProtectedRoute from './components/common/ProtectedRoute';
+import Layout from './components/common/Layout';
+import LoginPage from './pages/LoginPage';
+import DashboardPage from './pages/DashboardPage';
+import DocumentsPage from './pages/DocumentsPage';
 
 function App() {
-  const [count, setCount] = useState(0)
-
   return (
-    <>
-      <div>
-        <a href="https://vite.dev" target="_blank">
-          <img src={viteLogo} className="logo" alt="Vite logo" />
-        </a>
-        <a href="https://react.dev" target="_blank">
-          <img src={reactLogo} className="logo react" alt="React logo" />
-        </a>
-      </div>
-      <h1>Vite + React</h1>
-      <div className="card">
-        <button onClick={() => setCount((count) => count + 1)}>
-          count is {count}
-        </button>
-        <p>
-          Edit <code>src/App.jsx</code> and save to test HMR
-        </p>
-      </div>
-      <p className="read-the-docs">
-        Click on the Vite and React logos to learn more
-      </p>
-    </>
-  )
+    <AuthProvider>
+      <Router>
+        <div className="App">
+          <Routes>
+            {/* Public Routes */}
+            <Route path="/login" element={<LoginPage />} />
+
+            {/* Protected Routes */}
+            <Route path="/" element={<ProtectedRoute><Layout /></ProtectedRoute>}>
+              <Route index element={<Navigate to="/documents" replace />} />
+              <Route path="documents" element={<DocumentsPage />} />
+              <Route path="dashboard" element={<DashboardPage />} />
+              <Route path="documents" element={<div>Documents Page - Coming Soon</div>} />
+              <Route path="users" element={<div>User Management - Coming Soon</div>} />
+            </Route>
+
+            {/* Catch all route */}
+            <Route path="*" element={<Navigate to="/dashboard" replace />} />
+          </Routes>
+        </div>
+      </Router>
+    </AuthProvider>
+  );
 }
 
-export default App
+export default App;

src/frontend/src/assets/icons.jsx

@@ -0,0 +1,35 @@
+// src/assets/icons.jsx
+
+export const SunIcon = (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    className="h-6 w-6"
+    fill="none"
+    viewBox="0 0 24 24"
+    stroke="currentColor"
+  >
+    <path
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      strokeWidth="2"
+      d="M12 3v1m0 16v1m8.66-9h-1M4.34 12h-1m15.36 6.36l-.7-.7M6.34 6.34l-.7-.7m12.02 12.02l-.7-.7M6.34 17.66l-.7-.7M16 12a4 4 0 11-8 0 4 4 0 018 0z"
+    />
+  </svg>
+);
+
+export const MoonIcon = (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    className="h-6 w-6"
+    fill="none"
+    viewBox="0 0 24 24"
+    stroke="currentColor"
+  >
+    <path
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      strokeWidth="2"
+      d="M21 12.79A9 9 0 1111.21 3a7 7 0 0010.79 9.79z"
+    />
+  </svg>
+);

src/frontend/src/components/auth/AuthLayout.jsx

@@ -0,0 +1,41 @@
+import React from 'react';
+import ThemeSwitcher from "../common/ThemeSwither.jsx";
+
+/**
+ * AuthLayout component for authentication pages
+ * Provides centered layout with background and responsive design
+ *
+ * @param {Object} props - Component props
+ * @param {React.ReactNode} props.children - Child components to render
+ */
+
+const AuthHeader = () => {
+  return (
+    <div className="navbar bg-base-100 shadow-lg">
+      <div className="navbar-start">
+        <h1 className="text-xl font-bold">MyDocManager</h1>
+      </div>
+      <div className="navbar-end">
+        <ThemeSwitcher/>
+      </div>
+    </div>
+  )
+}
+
+function AuthLayout({children}) {
+  return (
+    <div className="min-h-screen bg-gradient-to-br from-primary/10 via-base-200 to-secondary/10">
+      <AuthHeader/>
+      {/* Main container with flex centering */}
+      <div className="min-h-screen flex items-center justify-center p-4">
+        {/* Content wrapper for responsive spacing */}
+        <div>
+          {children}
+        </div>
+      </div>
+
+    </div>
+  );
+}
+
+export default AuthLayout;

src/frontend/src/components/auth/LoginForm.jsx

@@ -0,0 +1,202 @@
+import React, {useEffect, useState} from 'react';
+import {useAuth} from '../../contexts/AuthContext';
+
+/**
+ * LoginForm component with DaisyUI styling
+ * Handles user authentication with form validation and error display
+ */
+function LoginForm() {
+  const {login, loading, error, clearError} = useAuth();
+  const [formData, setFormData] = useState({
+    username: '',
+    password: '',
+  });
+  const [formErrors, setFormErrors] = useState({});
+
+  // Clear errors when component mounts or form data changes
+  useEffect(() => {
+    if (error) {
+      const timer = setTimeout(() => {
+        clearError();
+      }, 5000); // Clear error after 5 seconds
+
+      return () => clearTimeout(timer);
+    }
+  }, [error, clearError]);
+
+  /**
+   * Handle input changes and clear related errors
+   * @param {Event} e - Input change event
+   */
+  const handleInputChange = (e) => {
+    const {name, value} = e.target;
+
+    setFormData(prev => ({
+      ...prev,
+      [name]: value,
+    }));
+
+    // Clear field error when user starts typing
+    if (formErrors[name]) {
+      setFormErrors(prev => ({
+        ...prev,
+        [name]: '',
+      }));
+    }
+
+    // Clear global error when user modifies form
+    if (error) {
+      clearError();
+    }
+  };
+
+  /**
+   * Validate form data before submission
+   * @returns {boolean} True if form is valid
+   */
+  const validateForm = () => {
+    const errors = {};
+
+    if (!formData.username.trim()) {
+      errors.username = 'Username is required';
+    }
+
+    if (!formData.password.trim()) {
+      errors.password = 'Password is required';
+    } else if (formData.password.length < 3) {
+      errors.password = 'Password must be at least 3 characters';
+    }
+
+    setFormErrors(errors);
+    return Object.keys(errors).length === 0;
+  };
+
+  /**
+   * Handle form submission
+   * @param {Event} e - Form submission event
+   */
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+
+    if (!validateForm()) {
+      return;
+    }
+
+    const success = await login(formData.username, formData.password);
+
+    if (success) {
+      // Reset form on successful login
+      setFormData({username: '', password: ''});
+      setFormErrors({});
+    }
+  };
+
+  return (
+    <div className="card max-w-md shadow-xl bg-base-100">
+      <div className="card-body">
+        {/* Card Header */}
+        <div className="text-center mb-6">
+          <p className="text-base-content/70 mt-2">Sign in to your account</p>
+        </div>
+
+        {/* Global Error Alert */}
+        {error && (
+          <div className="alert alert-error mb-4">
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              className="stroke-current shrink-0 h-6 w-6"
+              fill="none"
+              viewBox="0 0 24 24"
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth="2"
+                d="M10 14l2-2m0 0l2-2m-2 2l-2-2m2 2l2 2m7-2a9 9 0 11-18 0 9 9 0 0118 0z"
+              />
+            </svg>
+            <span>{error}</span>
+          </div>
+        )}
+
+        {/* Login Form */}
+        <form onSubmit={handleSubmit}>
+          {/* Username Field */}
+          <div id="username">
+            <label className="label">
+              <span className="label-text font-medium">Username</span>
+            </label>
+            <input
+              type="text"
+              name="username"
+              value={formData.username}
+              onChange={handleInputChange}
+              placeholder="Enter your username"
+              className={`input input-bordered w-full${
+                formErrors.username ? 'input-error' : ''
+              }`}
+              disabled={loading}
+              autoComplete="username"
+            />
+            {formErrors.username && (
+              <label className="label">
+                <span className="label-text-alt text-error">{formErrors.username}</span>
+              </label>
+            )}
+          </div>
+
+          {/* Password Field */}
+          <div id="password">
+            <label className="label">
+              <span className="label-text font-medium">Password</span>
+            </label>
+            <input
+              type="password"
+              name="password"
+              value={formData.password}
+              onChange={handleInputChange}
+              placeholder="Enter your password"
+              className={`input input-bordered ${
+                formErrors.password ? 'input-error' : ''
+              }`}
+              disabled={loading}
+              autoComplete="current-password"
+            />
+            {formErrors.password && (
+              <label className="label">
+                <span className="label-text-alt text-error">{formErrors.password}</span>
+              </label>
+            )}
+          </div>
+
+          {/* Submit Button */}
+          <div className="form-control mt-6">
+            <button
+              type="submit"
+              className={`btn btn-primary w-1/3 btn-hover-effect ${loading ? 'loading' : ''}`}
+              disabled={loading}
+            >
+              {loading ? (
+                <>
+                  <span className="loading loading-spinner loading-sm"></span>
+                  Signing in...
+                </>
+              ) : (
+                'Sign In'
+              )}
+            </button>
+          </div>
+        </form>
+
+        {/* Additional Info */}
+        <div className="text-center mt-4">
+          <p className="text-sm text-base-content/60">
+            Don't have an account? Contact your administrator.
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default LoginForm;

src/frontend/src/components/common/Header.jsx

@@ -0,0 +1,49 @@
+import {useAuth} from '../../hooks/useAuth';
+import {useNavigate} from 'react-router-dom';
+import ThemeSwitcher from "./ThemeSwither.jsx";
+import React from "react";
+
+const Header = () => {
+  const {user, logout} = useAuth();
+  const navigate = useNavigate();
+
+  const handleLogout = async () => {
+    await logout();
+    navigate('/login');
+  };
+
+  return (
+    <div className="navbar bg-base-100">
+      <div className="navbar-start">
+        <h1 className="text-xl font-bold">MyDocManager</h1>
+      </div>
+      <div className="navbar-end">
+        <div className="dropdown dropdown-end">
+          <div tabIndex={0} role="button" className="btn btn-ghost btn-circle avatar">
+            <div className="w-10 rounded-full bg-primary text-primary-content flex items-center justify-center">
+              <span className="text-sm font-medium">
+                {user?.username?.charAt(0).toUpperCase()}
+              </span>
+            </div>
+          </div>
+          <ul tabIndex={0} className="menu menu-sm dropdown-content bg-base-100 rounded-box z-[1] mt-3 w-52 p-2 shadow">
+            <li>
+              <div className="justify-between">
+                Profile
+                <span className="badge badge-sm">{user?.role}</span>
+              </div>
+            </li>
+            <li><a>Settings</a></li>
+            <li><ThemeSwitcher/></li>
+            <li>
+              <button onClick={handleLogout}>Logout</button>
+            </li>
+          </ul>
+        </div>
+
+      </div>
+    </div>
+  );
+};
+
+export default Header;

src/frontend/src/components/common/Layout.jsx

@@ -0,0 +1,24 @@
+import Header from './Header';
+import {Outlet} from 'react-router-dom';
+import Menu from "./Menu.jsx";
+import styles from './Layout.module.css';
+
+const Layout = () => {
+  return (
+    <div className={styles.layoutContainer}>
+      <Header/>
+      <div className="flex flex-1 overflow-hidden">
+        <aside className={styles.sidebar}>
+          <Menu/>
+        </aside>
+        <main className={styles.mainContent}>
+          <div className={styles.mainContentInner}>
+            <Outlet/>
+          </div>
+        </main>
+      </div>
+    </div>
+  );
+};
+
+export default Layout;

src/frontend/src/components/common/Layout.module.css

@@ -0,0 +1,36 @@
+/* Layout Container */
+.layoutContainer {
+    height: 100vh;
+    display: flex;
+    flex-direction: column;
+    background-color: var(--color-base-200);
+}
+
+
+/* Sidebar */
+.sidebar {
+    width: 16rem; /* 64px = 4rem, donc 256px = 16rem */
+    background-color: var(--color-base-100);
+    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
+    overflow-y: auto;
+}
+
+/* Main Content Area */
+.mainContent {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    min-height: 0; /* Important for flex to work properly with scrolling */
+}
+
+/* Main Content Inner Container */
+.mainContentInner {
+    max-width: 80rem; /* container max-width */
+    margin-left: auto;
+    margin-right: auto;
+    padding: 0.5rem 1rem;
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    min-height: 0; /* Important for flex to work properly with scrolling */
+}

src/frontend/src/components/common/Menu.jsx

@@ -0,0 +1,18 @@
+import {FaBuffer, FaPlus} from "react-icons/fa6";
+import { Link } from "react-router-dom";
+
+const Menu = () => {
+  return (
+    <div className="p-4">
+      <ul className="menu">
+        <li className="menu-title">Exploration</li>
+        <li><Link to="/dashboard"><FaBuffer/>Dashboard</Link></li>
+        <li><Link to="/documents"><FaBuffer/>To Review</Link></li>
+        <li className="menu-title mt-4">Catégories</li>
+        <li><a><i className="fas fa-plus"></i>Item</a></li>
+      </ul>
+    </div>
+  )
+}
+
+export default Menu;

src/frontend/src/components/common/ProtectedRoute.jsx

@@ -0,0 +1,69 @@
+import React from 'react';
+import {Navigate, useLocation} from 'react-router-dom';
+import {useAuth} from '../../contexts/AuthContext';
+
+/**
+ * ProtectedRoute component to guard routes that require authentication
+ * Redirects to login if user is not authenticated, preserving intended destination
+ *
+ * @param {Object} props - Component props
+ * @param {React.ReactNode} props.children - Child components to render if authenticated
+ * @param {string[]} props.allowedRoles - Array of roles allowed to access this route (optional)
+ */
+function ProtectedRoute({children, allowedRoles = []}) {
+  const {isAuthenticated, loading, user} = useAuth();
+  const location = useLocation();
+
+  // Show loading spinner while checking authentication
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-base-200">
+        <div className="text-center">
+          <span className="loading loading-spinner loading-lg text-primary"></span>
+          <p className="text-base-content/70 mt-4">Checking authentication...</p>
+        </div>
+      </div>
+    );
+  }
+
+  // Redirect to login if not authenticated
+  if (!isAuthenticated) {
+    return (
+      <Navigate
+        to="/login"
+        state={{from: location}}
+        replace
+      />
+    );
+  }
+
+  // Check role-based access if allowedRoles is specified
+  if (allowedRoles.length > 0 && user && !allowedRoles.includes(user.role)) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-base-200">
+        <div className="card w-full max-w-md shadow-xl bg-base-100">
+          <div className="card-body text-center">
+            <div className="text-6xl mb-4">🚫</div>
+            <h2 className="card-title justify-center text-error">Access Denied</h2>
+            <p className="text-base-content/70 mb-4">
+              You don't have permission to access this page.
+            </p>
+            <div className="card-actions justify-center">
+              <button
+                className="btn btn-primary"
+                onClick={() => window.history.back()}
+              >
+                Go Back
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  // User is authenticated and authorized, render children
+  return children;
+}
+
+export default ProtectedRoute;

src/frontend/src/components/common/ThemeSwither.jsx

@@ -0,0 +1,29 @@
+import {useEffect, useState} from "react";
+import {MoonIcon, SunIcon} from "../../assets/icons.jsx";
+
+function ThemeSwitcher() {
+  // State to store current theme
+  const [theme, setTheme] = useState("light");
+
+  // When theme changes, apply it to <html data-theme="">
+  useEffect(() => {
+    document.querySelector("html").setAttribute("data-theme", theme);
+  }, [theme]);
+
+  // Toggle between light and dark
+  const toggleTheme = () => {
+    setTheme(theme === "light" ? "dark" : "light");
+  };
+
+  return (
+    <button
+      onClick={toggleTheme}
+      className="btn btn-ghost btn-circle"
+    >
+      {theme === "light" ? MoonIcon : SunIcon}
+
+    </button>
+  );
+}
+
+export default ThemeSwitcher;

src/frontend/src/components/documents/DeleteConfirmModal.jsx

@@ -0,0 +1,68 @@
+/**
+ * DeleteConfirmModal Component
+ * Modal dialog to confirm document deletion
+ */
+
+import React from 'react';
+
+/**
+ * DeleteConfirmModal component
+ * @param {Object} props
+ * @param {boolean} props.isOpen - Whether the modal is open
+ * @param {Object|null} props.document - Document to delete
+ * @param {function(): void} props.onClose - Callback when modal is closed
+ * @param {function(): void} props.onConfirm - Callback when deletion is confirmed
+ * @param {boolean} props.isDeleting - Whether deletion is in progress
+ * @returns {JSX.Element}
+ */
+const DeleteConfirmModal = ({
+                              isOpen,
+                              document,
+                              onClose,
+                              onConfirm,
+                              isDeleting = false
+                            }) => {
+  if (!isOpen || !document) return null;
+
+  return (
+    <dialog className="modal modal-open">
+      <div className="modal-box">
+        <h3 className="font-bold text-lg">Confirm Deletion</h3>
+        <p className="py-4">
+          Are you sure you want to delete <span className="font-semibold">"{document.name}"</span>?
+        </p>
+        <p className="text-sm text-gray-500">
+          This action cannot be undone.
+        </p>
+        <div className="modal-action">
+          <button
+            className="btn btn-ghost"
+            onClick={onClose}
+            disabled={isDeleting}
+          >
+            Cancel
+          </button>
+          <button
+            className="btn btn-error"
+            onClick={onConfirm}
+            disabled={isDeleting}
+          >
+            {isDeleting ? (
+              <>
+                <span className="loading loading-spinner loading-sm"></span>
+                Deleting...
+              </>
+            ) : (
+              'Delete'
+            )}
+          </button>
+        </div>
+      </div>
+      <form method="dialog" className="modal-backdrop" onClick={onClose}>
+        <button disabled={isDeleting}>close</button>
+      </form>
+    </dialog>
+  );
+};
+
+export default DeleteConfirmModal;

src/frontend/src/components/documents/DocumentCard.jsx

@@ -0,0 +1,285 @@
+/**
+ * DocumentCard Component
+ * Displays a document as a DaisyUI card with thumbnail and metadata
+ * Supports different view modes: small, large, and detail
+ */
+
+import React, {memo, useState, useEffect} from 'react';
+import {API_BASE_URL} from "../../utils/api.js";
+
+/**
+ * Formats file size to human-readable format
+ * @param {number} bytes - File size in bytes
+ * @returns {string} Formatted file size
+ */
+const formatFileSize = (bytes) => {
+  if (bytes === 0) return '0 Bytes';
+  const k = 1024;
+  const sizes = ['Bytes', 'KB', 'MB', 'GB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return Math.round((bytes / Math.pow(k, i)) * 100) / 100 + ' ' + sizes[i];
+};
+
+/**
+ * Formats date to localized string
+ * @param {string} dateString - ISO date string
+ * @returns {string} Formatted date
+ */
+const formatDate = (dateString) => {
+  return new Date(dateString).toLocaleDateString('en-US', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric'
+  });
+};
+
+/**
+ * Builds full URL from relative path
+ * @param {string} relativePath - Relative API path
+ * @returns {string} Full URL
+ */
+const buildFullUrl = (relativePath) => {
+  if (!relativePath) return '';
+  const baseUrl = import.meta.env.VITE_API_BASE_URL || API_BASE_URL;
+  return `${baseUrl}${relativePath}`;
+};
+
+/**
+ * Hook to load protected images with bearer token
+ * @param {string} url - Image URL
+ * @returns {Object} { imageSrc, loading, error }
+ */
+const useProtectedImage = (url) => {
+  const [imageSrc, setImageSrc] = useState(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(false);
+
+  useEffect(() => {
+    if (!url) {
+      setLoading(false);
+      return;
+    }
+
+    let objectUrl;
+
+    const fetchImage = async () => {
+      try {
+        const token = localStorage.getItem('access_token');
+        const fullUrl = buildFullUrl(url);
+
+        const response = await fetch(fullUrl, {
+          headers: {
+            'Authorization': `Bearer ${token}`
+          }
+        });
+
+        if (!response.ok) {
+          throw new Error('Failed to load image');
+        }
+
+        const blob = await response.blob();
+        objectUrl = URL.createObjectURL(blob);
+        setImageSrc(objectUrl);
+        setLoading(false);
+      } catch (err) {
+        console.error('Error loading thumbnail:', err);
+        setError(true);
+        setLoading(false);
+      }
+    };
+
+    fetchImage();
+
+    // Cleanup: revoke object URL on unmount
+    return () => {
+      if (objectUrl) {
+        URL.revokeObjectURL(objectUrl);
+      }
+    };
+  }, [url]);
+
+  return { imageSrc, loading, error };
+};
+
+/**
+ * DocumentCard component
+ * @param {Object} props
+ * @param {Object} props.document - Document object
+ * @param {'small'|'large'|'detail'} props.viewMode - Current view mode
+ * @param {function(): void} props.onEdit - Callback when edit is clicked
+ * @param {function(): void} props.onDelete - Callback when delete is clicked
+ * @returns {JSX.Element}
+ */
+const DocumentCard = memo(({document, viewMode, onEdit, onDelete}) => {
+  const {name, originalFileType, thumbnailUrl, pageCount, fileSize, createdAt, tags, categories} = document;
+
+  // Load protected image
+  const { imageSrc, loading, error } = useProtectedImage(thumbnailUrl);
+
+  // Determine card classes based on view mode
+  const getCardClasses = () => {
+    const baseClasses = 'card bg-base-100 shadow-xl hover:shadow-2xl transition-shadow group relative';
+
+    switch (viewMode) {
+      case 'small':
+        return `${baseClasses} w-full`;
+      case 'large':
+        return `${baseClasses} w-full`;
+      case 'detail':
+        return `${baseClasses} w-full`;
+      default:
+        return baseClasses;
+    }
+  };
+
+  // Render thumbnail with hover actions
+  const renderThumbnail = () => {
+    const heightClass = viewMode === 'small' ? 'h-48' : viewMode === 'large' ? 'h-64' : 'h-64';
+
+    return (
+      <figure className="relative overflow-hidden">
+        {loading ? (
+          <div className={`w-[200px] ${heightClass} bg-gray-200 animate-pulse flex items-center justify-center`}>
+            <svg className="w-8 h-8 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
+            </svg>
+          </div>
+        ) : error ? (
+          <div className={`w-[200px] ${heightClass} bg-gray-300 flex flex-col items-center justify-center`}>
+            <svg className="w-8 h-8 text-gray-500 mb-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
+            </svg>
+            <span className="text-gray-500 text-xs">Failed to load</span>
+          </div>
+        ) : (
+          <img
+            src={imageSrc}
+            alt={`${name}`}
+            className={`object-cover ${heightClass}`}
+          />
+        )}
+
+        {/* Hover overlay with actions */}
+        <div className="absolute top-2 right-2 flex gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
+          <button
+            className="btn btn-sm btn-circle btn-primary"
+            onClick={onEdit}
+            aria-label="Edit document"
+            title="Edit"
+          >
+            <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24"
+                 stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                    d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"/>
+            </svg>
+          </button>
+          <button
+            className="btn btn-sm btn-circle btn-error"
+            onClick={onDelete}
+            aria-label="Delete document"
+            title="Delete"
+          >
+            <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24"
+                 stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                    d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"/>
+            </svg>
+          </button>
+        </div>
+
+        {/* File type badge */}
+        <div className="absolute bottom-2 left-2">
+          <span className="badge badge-accent badge-sm">{originalFileType}</span>
+        </div>
+      </figure>
+    );
+  };
+
+  // Render card body based on view mode
+  const renderCardBody = () => {
+    if (viewMode === 'small') {
+      return (
+        <div className="card-body p-3">
+          <h3 className="card-title text-sm truncate" title={name}>{name}</h3>
+          <p className="text-xs text-gray-500">{pageCount} page{pageCount > 1 ? 's' : ''}</p>
+        </div>
+      );
+    }
+
+    if (viewMode === 'large') {
+      return (
+        <div className="card-body p-4">
+          <h3 className="card-title text-base truncate" title={name}>{name}</h3>
+          <div className="flex flex-wrap gap-1 mb-2">
+            {tags.slice(0, 3).map(tag => (
+              <span key={tag} className="badge badge-primary badge-xs">{tag}</span>
+            ))}
+            {tags.length > 3 && (
+              <span className="badge badge-ghost badge-xs">+{tags.length - 3}</span>
+            )}
+          </div>
+          <div className="text-sm space-y-1">
+            <p className="text-gray-500">{pageCount} page{pageCount > 1 ? 's' : ''}</p>
+            <p className="text-gray-500">{formatFileSize(fileSize)}</p>
+          </div>
+        </div>
+      );
+    }
+
+    // Detail mode
+    return (
+      <div className="card-body">
+        <h3 className="card-title text-lg" title={name}>{name}</h3>
+
+        {/* Tags */}
+        {tags.length > 0 && (
+          <div className="flex flex-wrap gap-1 mb-2">
+            {tags.map(tag => (
+              <span key={tag} className="badge badge-primary badge-sm">{tag}</span>
+            ))}
+          </div>
+        )}
+
+        {/* Categories */}
+        {categories.length > 0 && (
+          <div className="flex flex-wrap gap-1 mb-3">
+            {categories.map(category => (
+              <span key={category} className="badge badge-secondary badge-sm">{category}</span>
+            ))}
+          </div>
+        )}
+
+        {/* Metadata */}
+        <div className="grid grid-cols-2 gap-2 text-sm">
+          <div>
+            <span className="font-semibold">Pages:</span>
+            <span className="ml-2 text-gray-500">{pageCount}</span>
+          </div>
+          <div>
+            <span className="font-semibold">Size:</span>
+            <span className="ml-2 text-gray-500">{formatFileSize(fileSize)}</span>
+          </div>
+          <div>
+            <span className="font-semibold">Type:</span>
+            <span className="ml-2 text-gray-500">{originalFileType}</span>
+          </div>
+          <div>
+            <span className="font-semibold">Date:</span>
+            <span className="ml-2 text-gray-500">{formatDate(createdAt)}</span>
+          </div>
+        </div>
+      </div>
+    );
+  };
+
+  return (
+    <div className={getCardClasses()}>
+      {renderThumbnail()}
+      {renderCardBody()}
+    </div>
+  );
+});
+
+DocumentCard.displayName = 'DocumentCard';
+
+export default DocumentCard;

src/frontend/src/components/documents/DocumentDetailView.jsx

@@ -0,0 +1,164 @@
+/**
+ * DocumentDetailView Component
+ * Displays a document in detail mode with all pages visible
+ * This is a placeholder that shows multiple page thumbnails
+ * When real PDF backend is ready, this can be replaced with actual PDF rendering
+ */
+
+import React from 'react';
+
+/**
+ * Formats file size to human-readable format
+ * @param {number} bytes - File size in bytes
+ * @returns {string} Formatted file size
+ */
+const formatFileSize = (bytes) => {
+  if (bytes === 0) return '0 Bytes';
+  const k = 1024;
+  const sizes = ['Bytes', 'KB', 'MB', 'GB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return Math.round((bytes / Math.pow(k, i)) * 100) / 100 + ' ' + sizes[i];
+};
+
+/**
+ * Formats date to localized string
+ * @param {string} dateString - ISO date string
+ * @returns {string} Formatted date
+ */
+const formatDate = (dateString) => {
+  return new Date(dateString).toLocaleDateString('en-US', {
+    year: 'numeric',
+    month: 'long',
+    day: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit'
+  });
+};
+
+/**
+ * DocumentDetailView component
+ * @param {Object} props
+ * @param {Object} props.document - Document object
+ * @param {function(): void} props.onEdit - Callback when edit is clicked
+ * @param {function(): void} props.onDelete - Callback when delete is clicked
+ * @returns {JSX.Element}
+ */
+const DocumentDetailView = ({ document, onEdit, onDelete }) => {
+  const {
+    name,
+    originalFileType,
+    thumbnailUrl,
+    pageCount,
+    fileSize,
+    createdAt,
+    tags,
+    categories
+  } = document;
+
+  // Generate placeholder pages (in real implementation, these would be actual PDF pages)
+  const pages = Array.from({ length: pageCount }, (_, i) => ({
+    pageNumber: i + 1,
+    thumbnailUrl: thumbnailUrl.replace('Page+1', `Page+${i + 1}`)
+  }));
+
+  return (
+    <div className="card bg-base-100 shadow-xl">
+      {/* Header with actions */}
+      <div className="card-body">
+        <div className="flex justify-between items-start mb-4">
+          <div className="flex-1">
+            <h2 className="card-title text-2xl mb-2">{name}</h2>
+
+            {/* Tags */}
+            {tags.length > 0 && (
+              <div className="flex flex-wrap gap-2 mb-2">
+                <span className="text-sm font-semibold text-gray-600">Tags:</span>
+                {tags.map(tag => (
+                  <span key={tag} className="badge badge-primary">{tag}</span>
+                ))}
+              </div>
+            )}
+
+            {/* Categories */}
+            {categories.length > 0 && (
+              <div className="flex flex-wrap gap-2 mb-3">
+                <span className="text-sm font-semibold text-gray-600">Categories:</span>
+                {categories.map(category => (
+                  <span key={category} className="badge badge-secondary">{category}</span>
+                ))}
+              </div>
+            )}
+          </div>
+
+          {/* Action buttons */}
+          <div className="flex gap-2">
+            <button
+              className="btn btn-primary btn-sm"
+              onClick={onEdit}
+              aria-label="Edit document"
+            >
+              <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" />
+              </svg>
+              Edit
+            </button>
+            <button
+              className="btn btn-error btn-sm"
+              onClick={onDelete}
+              aria-label="Delete document"
+            >
+              <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
+              </svg>
+              Delete
+            </button>
+          </div>
+        </div>
+
+        {/* Metadata grid */}
+        <div className="grid grid-cols-2 md:grid-cols-4 gap-4 mb-6 p-4 bg-base-200 rounded-lg">
+          <div>
+            <span className="text-sm font-semibold text-gray-600">Original Type</span>
+            <p className="text-lg">{originalFileType}</p>
+          </div>
+          <div>
+            <span className="text-sm font-semibold text-gray-600">Pages</span>
+            <p className="text-lg">{pageCount}</p>
+          </div>
+          <div>
+            <span className="text-sm font-semibold text-gray-600">File Size</span>
+            <p className="text-lg">{formatFileSize(fileSize)}</p>
+          </div>
+          <div>
+            <span className="text-sm font-semibold text-gray-600">Created</span>
+            <p className="text-lg">{formatDate(createdAt)}</p>
+          </div>
+        </div>
+
+        {/* Pages preview */}
+        <div>
+          <h3 className="text-lg font-semibold mb-4">Document Pages ({pageCount})</h3>
+          <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-4">
+            {pages.map((page) => (
+              <div key={page.pageNumber} className="relative group">
+                <div className="aspect-[3/4] bg-base-200 rounded-lg overflow-hidden shadow-md hover:shadow-xl transition-shadow">
+                  <img
+                    src={page.thumbnailUrl}
+                    alt={`Page ${page.pageNumber}`}
+                    className="w-full h-full object-cover"
+                    loading="lazy"
+                  />
+                </div>
+                <div className="text-center mt-2">
+                  <span className="text-sm text-gray-600">Page {page.pageNumber}</span>
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default DocumentDetailView;

src/frontend/src/components/documents/DocumentGallery.jsx

@@ -0,0 +1,181 @@
+/**
+ * DocumentGallery Component
+ * Main container for displaying documents in different view modes
+ */
+
+import React, { useState } from 'react';
+import DocumentCard from './DocumentCard';
+import DocumentDetailView from './DocumentDetailView';
+import ViewModeSwitcher from './ViewModeSwitcher';
+import EditDocumentModal from './EditDocumentModal';
+import DeleteConfirmModal from './DeleteConfirmModal';
+import { useDocuments } from '../../hooks/useDocuments';
+
+/**
+ * DocumentGallery component
+ * @returns {JSX.Element}
+ */
+const DocumentGallery = () => {
+  const { documents, loading, error, updateDocument, deleteDocument } = useDocuments();
+  const [viewMode, setViewMode] = useState('large');
+  const [editingDocument, setEditingDocument] = useState(null);
+  const [deletingDocument, setDeletingDocument] = useState(null);
+  const [isSaving, setIsSaving] = useState(false);
+  const [isDeleting, setIsDeleting] = useState(false);
+
+  /**
+   * Handles opening the edit modal
+   * @param {Object} document - Document to edit
+   */
+  const handleEditClick = (document) => {
+    setEditingDocument(document);
+  };
+
+  /**
+   * Handles opening the delete confirmation modal
+   * @param {Object} document - Document to delete
+   */
+  const handleDeleteClick = (document) => {
+    setDeletingDocument(document);
+  };
+
+  /**
+   * Handles saving document changes
+   * @param {Object} updates - Updates object with tags and categories
+   */
+  const handleSaveEdit = async (updates) => {
+    if (!editingDocument) return;
+
+    setIsSaving(true);
+    const success = await updateDocument(editingDocument.id, updates);
+    setIsSaving(false);
+
+    if (success) {
+      setEditingDocument(null);
+    }
+  };
+
+  /**
+   * Handles confirming document deletion
+   */
+  const handleConfirmDelete = async () => {
+    if (!deletingDocument) return;
+
+    setIsDeleting(true);
+    const success = await deleteDocument(deletingDocument.id);
+    setIsDeleting(false);
+
+    if (success) {
+      setDeletingDocument(null);
+    }
+  };
+
+  /**
+   * Gets grid classes based on view mode
+   * @returns {string} Tailwind CSS classes
+   */
+  const getGridClasses = () => {
+    switch (viewMode) {
+      case 'small':
+        return 'grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 xl:grid-cols-6 gap-4';
+      case 'large':
+        return 'grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6';
+      case 'detail':
+        return 'flex flex-col gap-6';
+      default:
+        return 'grid grid-cols-1 gap-4';
+    }
+  };
+
+  // Loading state
+  if (loading) {
+    return (
+      <div className="flex justify-center items-center min-h-[400px] ">
+        <span className="loading loading-spinner loading-lg"></span>
+      </div>
+    );
+  }
+
+  // Error state
+  if (error) {
+    return (
+      <div className="alert alert-error">
+        <svg xmlns="http://www.w3.org/2000/svg" className="stroke-current shrink-0 h-6 w-6" fill="none" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M10 14l2-2m0 0l2-2m-2 2l-2-2m2 2l2 2m7-2a9 9 0 11-18 0 9 9 0 0118 0z" />
+        </svg>
+        <span>Error loading documents: {error}</span>
+      </div>
+    );
+  }
+
+  // Empty state
+  if (documents.length === 0) {
+    return (
+      <div className="flex flex-col items-center justify-center min-h-[400px] text-center">
+        <svg xmlns="http://www.w3.org/2000/svg" className="h-24 w-24 text-gray-300 mb-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+        </svg>
+        <h3 className="text-xl font-semibold mb-2">No documents yet</h3>
+        <p className="text-gray-500">Upload your first document to get started</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="h-full flex flex-col">
+      {/* Header with view mode switcher - Always visible */}
+      <div className="flex justify-between items-center mb-6 flex-shrink-0">
+        <div>
+          <p className="text-gray-500">{documents.length} document{documents.length !== 1 ? 's' : ''}</p>
+        </div>
+        <ViewModeSwitcher
+          currentMode={viewMode}
+          onModeChange={setViewMode}
+        />
+      </div>
+
+      {/* Document grid/list - Scrollable */}
+      <div className="flex-1 overflow-y-auto">
+        <div className={getGridClasses()}>
+          {documents.map(document => (
+            viewMode === 'detail' ? (
+              <DocumentDetailView
+                key={document.id}
+                document={document}
+                onEdit={() => handleEditClick(document)}
+                onDelete={() => handleDeleteClick(document)}
+              />
+            ) : (
+              <DocumentCard
+                key={document.id}
+                document={document}
+                viewMode={viewMode}
+                onEdit={() => handleEditClick(document)}
+                onDelete={() => handleDeleteClick(document)}
+              />
+            )
+          ))}
+        </div>
+      </div>
+
+      {/* Modals */}
+      <EditDocumentModal
+        isOpen={!!editingDocument}
+        document={editingDocument}
+        onClose={() => setEditingDocument(null)}
+        onSave={handleSaveEdit}
+        isSaving={isSaving}
+      />
+
+      <DeleteConfirmModal
+        isOpen={!!deletingDocument}
+        document={deletingDocument}
+        onClose={() => setDeletingDocument(null)}
+        onConfirm={handleConfirmDelete}
+        isDeleting={isDeleting}
+      />
+    </div>
+  );
+};
+
+export default DocumentGallery;

src/frontend/src/components/documents/EditDocumentModal.jsx

@@ -0,0 +1,225 @@
+/**
+ * EditDocumentModal Component
+ * Modal dialog for editing document tags and categories
+ */
+
+import React, { useState, useEffect } from 'react';
+import { getAvailableTags, getAvailableCategories } from '../../services/documentService';
+
+/**
+ * EditDocumentModal component
+ * @param {Object} props
+ * @param {boolean} props.isOpen - Whether the modal is open
+ * @param {Object|null} props.document - Document to edit
+ * @param {function(): void} props.onClose - Callback when modal is closed
+ * @param {function(Object): void} props.onSave - Callback when changes are saved
+ * @param {boolean} props.isSaving - Whether save is in progress
+ * @returns {JSX.Element}
+ */
+const EditDocumentModal = ({
+  isOpen,
+  document,
+  onClose,
+  onSave,
+  isSaving = false
+}) => {
+  const [selectedTags, setSelectedTags] = useState([]);
+  const [selectedCategories, setSelectedCategories] = useState([]);
+  const [availableTags, setAvailableTags] = useState([]);
+  const [availableCategories, setAvailableCategories] = useState([]);
+  const [newTag, setNewTag] = useState('');
+  const [newCategory, setNewCategory] = useState('');
+
+  // Load available tags and categories
+  useEffect(() => {
+    const loadOptions = async () => {
+      const [tags, categories] = await Promise.all([
+        getAvailableTags(),
+        getAvailableCategories()
+      ]);
+      setAvailableTags(tags);
+      setAvailableCategories(categories);
+    };
+    loadOptions();
+  }, []);
+
+  // Initialize selected values when document changes
+  useEffect(() => {
+    if (document) {
+      setSelectedTags(document.tags || []);
+      setSelectedCategories(document.categories || []);
+    }
+  }, [document]);
+
+  const handleAddTag = (tag) => {
+    if (tag && !selectedTags.includes(tag)) {
+      setSelectedTags([...selectedTags, tag]);
+    }
+    setNewTag('');
+  };
+
+  const handleRemoveTag = (tag) => {
+    setSelectedTags(selectedTags.filter(t => t !== tag));
+  };
+
+  const handleAddCategory = (category) => {
+    if (category && !selectedCategories.includes(category)) {
+      setSelectedCategories([...selectedCategories, category]);
+    }
+    setNewCategory('');
+  };
+
+  const handleRemoveCategory = (category) => {
+    setSelectedCategories(selectedCategories.filter(c => c !== category));
+  };
+
+  const handleSave = () => {
+    onSave({
+      tags: selectedTags,
+      categories: selectedCategories
+    });
+  };
+
+  if (!isOpen || !document) return null;
+
+  return (
+    <dialog className="modal modal-open">
+      <div className="modal-box max-w-2xl">
+        <h3 className="font-bold text-lg mb-4">Edit Document</h3>
+
+        <div className="mb-4">
+          <p className="text-sm text-gray-500">
+            Document: <span className="font-semibold">{document.name}</span>
+          </p>
+        </div>
+
+        {/* Tags Section */}
+        <div className="mb-6">
+          <label className="label">
+            <span className="label-text font-semibold">Tags</span>
+          </label>
+
+          {/* Selected Tags */}
+          <div className="flex flex-wrap gap-2 mb-3">
+            {selectedTags.map(tag => (
+              <div key={tag} className="badge badge-primary gap-2">
+                {tag}
+                <button
+                  type="button"
+                  className="btn btn-ghost btn-xs"
+                  onClick={() => handleRemoveTag(tag)}
+                  disabled={isSaving}
+                >
+                  ✕
+                </button>
+              </div>
+            ))}
+          </div>
+
+          {/* Add Tag */}
+          <div className="flex gap-2">
+            <select
+              className="select select-bordered flex-1"
+              value={newTag}
+              onChange={(e) => setNewTag(e.target.value)}
+              disabled={isSaving}
+            >
+              <option value="">Select a tag...</option>
+              {availableTags
+                .filter(tag => !selectedTags.includes(tag))
+                .map(tag => (
+                  <option key={tag} value={tag}>{tag}</option>
+                ))
+              }
+            </select>
+            <button
+              className="btn btn-primary"
+              onClick={() => handleAddTag(newTag)}
+              disabled={!newTag || isSaving}
+            >
+              Add
+            </button>
+          </div>
+        </div>
+
+        {/* Categories Section */}
+        <div className="mb-6">
+          <label className="label">
+            <span className="label-text font-semibold">Categories</span>
+          </label>
+
+          {/* Selected Categories */}
+          <div className="flex flex-wrap gap-2 mb-3">
+            {selectedCategories.map(category => (
+              <div key={category} className="badge badge-secondary gap-2">
+                {category}
+                <button
+                  type="button"
+                  className="btn btn-ghost btn-xs"
+                  onClick={() => handleRemoveCategory(category)}
+                  disabled={isSaving}
+                >
+                  ✕
+                </button>
+              </div>
+            ))}
+          </div>
+
+          {/* Add Category */}
+          <div className="flex gap-2">
+            <select
+              className="select select-bordered flex-1"
+              value={newCategory}
+              onChange={(e) => setNewCategory(e.target.value)}
+              disabled={isSaving}
+            >
+              <option value="">Select a category...</option>
+              {availableCategories
+                .filter(cat => !selectedCategories.includes(cat))
+                .map(cat => (
+                  <option key={cat} value={cat}>{cat}</option>
+                ))
+              }
+            </select>
+            <button
+              className="btn btn-secondary"
+              onClick={() => handleAddCategory(newCategory)}
+              disabled={!newCategory || isSaving}
+            >
+              Add
+            </button>
+          </div>
+        </div>
+
+        <div className="modal-action">
+          <button
+            className="btn btn-ghost"
+            onClick={onClose}
+            disabled={isSaving}
+          >
+            Cancel
+          </button>
+          <button
+            className="btn btn-primary"
+            onClick={handleSave}
+            disabled={isSaving}
+          >
+            {isSaving ? (
+              <>
+                <span className="loading loading-spinner loading-sm"></span>
+                Saving...
+              </>
+            ) : (
+              'Save Changes'
+            )}
+          </button>
+        </div>
+      </div>
+      <form method="dialog" className="modal-backdrop" onClick={onClose}>
+        <button disabled={isSaving}>close</button>
+      </form>
+    </dialog>
+  );
+};
+
+export default EditDocumentModal;

src/frontend/src/components/documents/ViewModeSwitcher.jsx

@@ -0,0 +1,51 @@
+/**
+ * ViewModeSwitcher Component
+ * Allows users to switch between different view modes (small, large, detail)
+ */
+
+import React from 'react';
+import {FaList} from "react-icons/fa6";
+import {FaTh, FaThLarge} from "react-icons/fa";
+
+/**
+ * @typedef {'small' | 'large' | 'detail'} ViewMode
+ */
+
+/**
+ * ViewModeSwitcher component
+ * @param {Object} props
+ * @param {ViewMode} props.currentMode - Current active view mode
+ * @param {function(ViewMode): void} props.onModeChange - Callback when mode changes
+ * @returns {JSX.Element}
+ */
+const ViewModeSwitcher = ({ currentMode, onModeChange }) => {
+  const modes = [
+    { id: 'small', label: 'Small', icon: FaTh },
+    { id: 'large', label: 'Large', icon: FaThLarge },
+    { id: 'detail', label: 'Detail', icon: FaList }
+  ];
+
+  return (
+    <div className="flex gap-2">
+      {modes.map(mode => {
+        const IconComponent = mode.icon;
+        return (
+          <button
+            key={mode.id}
+            onClick={() => onModeChange(mode.id)}
+            className={`btn btn-sm ${
+              currentMode === mode.id ? 'btn-primary' : 'btn-ghost'
+            }`}
+            aria-label={`Switch to ${mode.label} view`}
+            title={`${mode.label} view`}
+          >
+            <IconComponent />
+            <span className="hidden sm:inline ml-1">{mode.label}</span>
+          </button>
+        );
+      })}
+    </div>
+  );
+};
+
+export default ViewModeSwitcher;

src/frontend/src/contexts/AuthContext.jsx

@@ -0,0 +1,205 @@
+import React, {createContext, useContext, useEffect, useReducer} from 'react';
+import authService from '../services/authService';
+
+// Auth state actions
+const AUTH_ACTIONS = {
+  LOGIN_START: 'LOGIN_START',
+  LOGIN_SUCCESS: 'LOGIN_SUCCESS',
+  LOGIN_FAILURE: 'LOGIN_FAILURE',
+  LOGOUT: 'LOGOUT',
+  LOAD_USER: 'LOAD_USER',
+  CLEAR_ERROR: 'CLEAR_ERROR',
+};
+
+// Initial state
+const initialState = {
+  user: null,
+  token: null,
+  isAuthenticated: false,
+  loading: true, // Loading true initially to check stored auth
+  error: null,
+};
+
+// Auth reducer to manage state transitions
+function authReducer(state, action) {
+  switch (action.type) {
+    case AUTH_ACTIONS.LOGIN_START:
+      return {
+        ...state,
+        loading: true,
+        error: null,
+      };
+
+    case AUTH_ACTIONS.LOGIN_SUCCESS:
+      return {
+        ...state,
+        user: action.payload.user,
+        token: action.payload.token,
+        isAuthenticated: true,
+        loading: false,
+        error: null,
+      };
+
+    case AUTH_ACTIONS.LOGIN_FAILURE:
+      return {
+        ...state,
+        user: null,
+        token: null,
+        isAuthenticated: false,
+        loading: false,
+        error: action.payload.error,
+      };
+
+    case AUTH_ACTIONS.LOGOUT:
+      return {
+        ...state,
+        user: null,
+        token: null,
+        isAuthenticated: false,
+        loading: false,
+        error: null,
+      };
+
+    case AUTH_ACTIONS.LOAD_USER:
+      return {
+        ...state,
+        user: action.payload.user,
+        token: action.payload.token,
+        isAuthenticated: !!action.payload.token,
+        loading: false,
+        error: null,
+      };
+
+    case AUTH_ACTIONS.CLEAR_ERROR:
+      return {
+        ...state,
+        error: null,
+      };
+
+    default:
+      return state;
+  }
+}
+
+// Create context
+const AuthContext = createContext(null);
+
+/**
+ * AuthProvider component to wrap the app and provide authentication state
+ * @param {Object} props - Component props
+ * @param {React.ReactNode} props.children - Child components
+ */
+export function AuthProvider({children}) {
+  const [state, dispatch] = useReducer(authReducer, initialState);
+
+  // Load stored authentication data on app startup
+  useEffect(() => {
+    const loadStoredAuth = () => {
+      const token = authService.getStoredToken();
+      const user = authService.getStoredUser();
+
+      dispatch({
+        type: AUTH_ACTIONS.LOAD_USER,
+        payload: {user, token},
+      });
+    };
+
+    loadStoredAuth();
+  }, []);
+
+  /**
+   * Login function to authenticate user
+   * @param {string} username - User's username
+   * @param {string} password - User's password
+   * @returns {Promise<boolean>} True if login successful
+   */
+  const login = async (username, password) => {
+    try {
+      dispatch({type: AUTH_ACTIONS.LOGIN_START});
+
+      const {access_token, user} = await authService.login(username, password);
+
+      dispatch({
+        type: AUTH_ACTIONS.LOGIN_SUCCESS,
+        payload: {user, token: access_token},
+      });
+
+      return true;
+    } catch (error) {
+      dispatch({
+        type: AUTH_ACTIONS.LOGIN_FAILURE,
+        payload: {error: error.message},
+      });
+      return false;
+    }
+  };
+
+  /**
+   * Logout function to clear authentication state
+   */
+  const logout = () => {
+    authService.logout();
+    dispatch({type: AUTH_ACTIONS.LOGOUT});
+  };
+
+  /**
+   * Clear error message from state
+   */
+  const clearError = () => {
+    dispatch({type: AUTH_ACTIONS.CLEAR_ERROR});
+  };
+
+  /**
+   * Refresh user data from API
+   */
+  const refreshUser = async () => {
+    try {
+      const user = await authService.getCurrentUser();
+      dispatch({
+        type: AUTH_ACTIONS.LOGIN_SUCCESS,
+        payload: {user, token: state.token},
+      });
+    } catch (error) {
+      console.error('Failed to refresh user data:', error);
+      // Don't logout on refresh failure, just log error
+    }
+  };
+
+  // Context value object
+  const value = {
+    // State
+    user: state.user,
+    token: state.token,
+    isAuthenticated: state.isAuthenticated,
+    loading: state.loading,
+    error: state.error,
+
+    // Actions
+    login,
+    logout,
+    clearError,
+    refreshUser,
+  };
+
+  return (
+    <AuthContext.Provider value={value}>
+      {children}
+    </AuthContext.Provider>
+  );
+}
+
+/**
+ * Custom hook to use authentication context
+ * @returns {Object} Auth context value
+ * @throws {Error} If used outside AuthProvider
+ */
+export function useAuth() {
+  const context = useContext(AuthContext);
+
+  if (!context) {
+    throw new Error('useAuth must be used within an AuthProvider');
+  }
+
+  return context;
+}
+export { AuthContext };

src/frontend/src/hooks/useAuth.js

@@ -0,0 +1,12 @@
+import {useContext} from 'react';
+import {AuthContext} from '../contexts/AuthContext';
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+
+  if (!context) {
+    throw new Error('useAuth must be used within an AuthProvider');
+  }
+
+  return context;
+};

src/frontend/src/hooks/useDocuments.js

@@ -0,0 +1,85 @@
+/**
+ * Custom hook for managing documents
+ * Handles fetching, updating, and deleting documents
+ */
+
+import { useState, useEffect, useCallback } from 'react';
+import * as documentService from '../services/documentService';
+
+/**
+ * Hook for managing documents state and operations
+ * @returns {Object} Documents state and operations
+ */
+export const useDocuments = () => {
+  const [documents, setDocuments] = useState([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(null);
+
+  /**
+   * Fetches all documents from the service
+   */
+  const fetchDocuments = useCallback(async () => {
+    try {
+      setLoading(true);
+      setError(null);
+      const data = await documentService.getAllDocuments();
+      setDocuments(data);
+    } catch (err) {
+      setError(err.message);
+      console.error('Error fetching documents:', err);
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  /**
+   * Updates a document's tags and categories
+   * @param {string} id - Document ID
+   * @param {Object} updates - Updates object
+   * @returns {Promise<boolean>} Success status
+   */
+  const updateDocument = useCallback(async (id, updates) => {
+    try {
+      const updatedDoc = await documentService.updateDocument(id, updates);
+      setDocuments(prevDocs =>
+        prevDocs.map(doc => (doc.id === id ? updatedDoc : doc))
+      );
+      return true;
+    } catch (err) {
+      setError(err.message);
+      console.error('Error updating document:', err);
+      return false;
+    }
+  }, []);
+
+  /**
+   * Deletes a document
+   * @param {string} id - Document ID
+   * @returns {Promise<boolean>} Success status
+   */
+  const deleteDocument = useCallback(async (id) => {
+    try {
+      await documentService.deleteDocument(id);
+      setDocuments(prevDocs => prevDocs.filter(doc => doc.id !== id));
+      return true;
+    } catch (err) {
+      setError(err.message);
+      console.error('Error deleting document:', err);
+      return false;
+    }
+  }, []);
+
+  // Fetch documents on mount
+  useEffect(() => {
+    fetchDocuments();
+  }, [fetchDocuments]);
+
+  return {
+    documents,
+    loading,
+    error,
+    fetchDocuments,
+    updateDocument,
+    deleteDocument
+  };
+};

src/frontend/src/index.css

@@ -1,68 +1,11 @@
-:root {
-  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
-  font-weight: 400;
-
-  color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
-
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
-}
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+@plugin "daisyui";
 
+/* Custom styles for the application */
 body {
-  margin: 0;
-  display: flex;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+    margin: 0;
 }
 
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
-}
-
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  background-color: #1a1a1a;
-  cursor: pointer;
-  transition: border-color 0.25s;
-}
-button:hover {
-  border-color: #646cff;
-}
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
-}
-
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
-  }
-}

src/frontend/src/main.jsx

@@ -1,6 +1,7 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
+import './App.css'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(

src/frontend/src/pages/DashboardPage.jsx

@@ -0,0 +1,239 @@
+import {useEffect, useState} from 'react';
+import {useAuth} from '../hooks/useAuth';
+
+const DashboardPage = () => {
+  const {user} = useAuth();
+  const [stats, setStats] = useState({
+    totalDocuments: 0,
+    processingJobs: 0,
+    completedJobs: 0,
+    failedJobs: 0
+  });
+
+  const [recentFiles, setRecentFiles] = useState([]);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    // Simulate API calls for dashboard data
+    const fetchDashboardData = async () => {
+      try {
+        // TODO: Replace with actual API calls
+        setTimeout(() => {
+          setStats({
+            totalDocuments: 42,
+            processingJobs: 3,
+            completedJobs: 38,
+            failedJobs: 1
+          });
+
+          setRecentFiles([
+            {
+              id: 1,
+              filename: 'invoice_2024.pdf',
+              status: 'completed',
+              processedAt: '2024-01-15 14:30:00',
+              fileType: 'pdf'
+            },
+            {
+              id: 2,
+              filename: 'contract_draft.docx',
+              status: 'processing',
+              processedAt: '2024-01-15 14:25:00',
+              fileType: 'docx'
+            },
+            {
+              id: 3,
+              filename: 'receipt_scan.jpg',
+              status: 'completed',
+              processedAt: '2024-01-15 14:20:00',
+              fileType: 'image'
+            }
+          ]);
+
+          setLoading(false);
+        }, 1000);
+      } catch (error) {
+        console.error('Error fetching dashboard data:', error);
+        setLoading(false);
+      }
+    };
+
+    fetchDashboardData();
+  }, []);
+
+  const getStatusBadge = (status) => {
+    const statusColors = {
+      completed: 'badge-success',
+      processing: 'badge-warning',
+      failed: 'badge-error',
+      pending: 'badge-info'
+    };
+
+    return `badge ${statusColors[status] || 'badge-neutral'}`;
+  };
+
+  const getFileTypeIcon = (fileType) => {
+    const icons = {
+      pdf: '📄',
+      docx: '📝',
+      image: '🖼️',
+      txt: '📄'
+    };
+
+    return icons[fileType] || '📄';
+  };
+
+  if (loading) {
+    return (
+      <div className="flex justify-center items-center h-64">
+        <span className="loading loading-spinner loading-lg"></span>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      {/* Welcome Header */}
+      <div className="bg-base-100 rounded-lg shadow p-6">
+        <h1 className="text-3xl font-bold text-base-content">
+          Welcome back, {user?.username}!
+        </h1>
+        <p className="text-base-content/60 mt-2">
+          Here's your document processing overview
+        </p>
+      </div>
+
+      {/* Stats Cards */}
+      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
+        <div className="stat bg-base-100 rounded-lg shadow">
+          <div className="stat-figure text-primary">
+            <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
+            </svg>
+          </div>
+          <div className="stat-title">Total Documents</div>
+          <div className="stat-value text-primary">{stats.totalDocuments}</div>
+        </div>
+
+        <div className="stat bg-base-100 rounded-lg shadow">
+          <div className="stat-figure text-warning">
+            <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+            </svg>
+          </div>
+          <div className="stat-title">Processing</div>
+          <div className="stat-value text-warning">{stats.processingJobs}</div>
+        </div>
+
+        <div className="stat bg-base-100 rounded-lg shadow">
+          <div className="stat-figure text-success">
+            <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z"/>
+            </svg>
+          </div>
+          <div className="stat-title">Completed</div>
+          <div className="stat-value text-success">{stats.completedJobs}</div>
+        </div>
+
+        <div className="stat bg-base-100 rounded-lg shadow">
+          <div className="stat-figure text-error">
+            <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
+            </svg>
+          </div>
+          <div className="stat-title">Failed</div>
+          <div className="stat-value text-error">{stats.failedJobs}</div>
+        </div>
+      </div>
+
+      {/* Recent Files */}
+      <div className="bg-base-100 rounded-lg shadow">
+        <div className="p-6 border-b border-base-300">
+          <h2 className="text-xl font-semibold">Recent Files</h2>
+        </div>
+        <div className="overflow-x-auto">
+          <table className="table table-zebra">
+            <thead>
+            <tr>
+              <th>File</th>
+              <th>Type</th>
+              <th>Status</th>
+              <th>Processed At</th>
+              <th>Actions</th>
+            </tr>
+            </thead>
+            <tbody>
+            {recentFiles.map((file) => (
+              <tr key={file.id}>
+                <td>
+                  <div className="flex items-center space-x-3">
+                    <div className="text-2xl">
+                      {getFileTypeIcon(file.fileType)}
+                    </div>
+                    <div className="font-medium">{file.filename}</div>
+                  </div>
+                </td>
+                <td>
+                    <span className="badge badge-outline">
+                      {file.fileType.toUpperCase()}
+                    </span>
+                </td>
+                <td>
+                    <span className={getStatusBadge(file.status)}>
+                      {file.status.charAt(0).toUpperCase() + file.status.slice(1)}
+                    </span>
+                </td>
+                <td>{file.processedAt}</td>
+                <td>
+                  <div className="flex space-x-2">
+                    <button className="btn btn-sm btn-ghost">View</button>
+                    <button className="btn btn-sm btn-ghost">Download</button>
+                  </div>
+                </td>
+              </tr>
+            ))}
+            </tbody>
+          </table>
+        </div>
+      </div>
+
+      {/* Quick Actions */}
+      <div className="bg-base-100 rounded-lg shadow p-6">
+        <h2 className="text-xl font-semibold mb-4">Quick Actions</h2>
+        <div className="flex flex-wrap gap-4">
+          <button className="btn btn-primary">
+            <svg className="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12"/>
+            </svg>
+            Upload Documents
+          </button>
+
+          <button className="btn btn-outline">
+            <svg className="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                    d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
+            </svg>
+            View Reports
+          </button>
+
+          {user?.role === 'admin' && (
+            <button className="btn btn-outline">
+              <svg className="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2"
+                      d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197m13.5-9a2.5 2.5 0 11-5 0 2.5 2.5 0 015 0z"/>
+              </svg>
+              Manage Users
+            </button>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default DashboardPage;

src/frontend/src/pages/DocumentsPage.jsx

@@ -0,0 +1,21 @@
+/**
+ * DocumentsPage Component
+ * Main page for displaying and managing documents
+ */
+
+import React from 'react';
+import DocumentGallery from '../components/documents/DocumentGallery';
+
+/**
+ * DocumentsPage component
+ * @returns {JSX.Element}
+ */
+const DocumentsPage = () => {
+  return (
+    <div className="h-full flex flex-col">
+      <DocumentGallery />
+    </div>
+  );
+};
+
+export default DocumentsPage;

src/frontend/src/pages/LoginPage.jsx

@@ -0,0 +1,48 @@
+import React, {useEffect} from 'react';
+import {useNavigate} from 'react-router-dom';
+import {useAuth} from '../contexts/AuthContext';
+import AuthLayout from '../components/auth/AuthLayout';
+import LoginForm from '../components/auth/LoginForm';
+
+/**
+ * LoginPage component
+ * Full page component that handles login functionality and redirects
+ */
+function LoginPage() {
+  const {isAuthenticated, loading} = useAuth();
+  const navigate = useNavigate();
+
+  // Redirect to dashboard if already authenticated
+  useEffect(() => {
+    if (!loading && isAuthenticated) {
+      navigate('/dashboard', {replace: true});
+    }
+  }, [isAuthenticated, loading, navigate]);
+
+  // Show loading spinner while checking authentication
+  if (loading) {
+    return (
+      <AuthLayout>
+        <div className="card w-full max-w-md shadow-xl bg-base-100">
+          <div className="card-body items-center">
+            <span className="loading loading-spinner loading-lg text-primary"></span>
+            <p className="text-base-content/70 mt-4">Loading...</p>
+          </div>
+        </div>
+      </AuthLayout>
+    );
+  }
+
+  // Don't render login form if user is authenticated (prevents flash)
+  if (isAuthenticated) {
+    return null;
+  }
+
+  return (
+    <AuthLayout>
+      <LoginForm/>
+    </AuthLayout>
+  );
+}
+
+export default LoginPage;

src/frontend/src/services/authService.js

@@ -0,0 +1,101 @@
+import api from '../utils/api';
+
+/**
+ * Authentication service for handling login, logout, and user profile operations
+ */
+class AuthService {
+  /**
+   * Login user with username and password
+   * @param {string} username - User's username
+   * @param {string} password - User's password
+   * @returns {Promise<{access_token: string, user: Object}>} Login response with token and user data
+   */
+  async login(username, password) {
+    try {
+      // FastAPI expects form data for OAuth2PasswordRequestForm
+      const formData = new FormData();
+      formData.append('username', username);
+      formData.append('password', password);
+
+      const response = await api.post('/auth/login', formData, {
+        headers: {
+          'Content-Type': 'multipart/form-data',
+        },
+      });
+
+      const {access_token, user} = response.data;
+
+      // Store token and user data in localStorage
+      localStorage.setItem('access_token', access_token);
+      localStorage.setItem('user', JSON.stringify(user));
+
+      return {access_token, user};
+    } catch (error) {
+      // Extract error message from response
+      const errorMessage = error.response?.data?.detail || 'Login failed';
+      throw new Error(errorMessage);
+    }
+  }
+
+  /**
+   * Logout user by clearing stored data
+   */
+  logout() {
+    localStorage.removeItem('access_token');
+    localStorage.removeItem('user');
+  }
+
+  /**
+   * Get current user profile from API
+   * @returns {Promise<Object>} Current user profile
+   */
+  async getCurrentUser() {
+    try {
+      const response = await api.get('/auth/me');
+      const user = response.data;
+
+      // Update stored user data
+      localStorage.setItem('user', JSON.stringify(user));
+
+      return user;
+    } catch (error) {
+      const errorMessage = error.response?.data?.detail || 'Failed to get user profile';
+      throw new Error(errorMessage);
+    }
+  }
+
+  /**
+   * Check if user is authenticated by verifying token existence
+   * @returns {boolean} True if user has valid token
+   */
+  isAuthenticated() {
+    const token = localStorage.getItem('access_token');
+    return !!token;
+  }
+
+  /**
+   * Get stored user data from localStorage
+   * @returns {Object|null} User data or null if not found
+   */
+  getStoredUser() {
+    try {
+      const userStr = localStorage.getItem('user');
+      return userStr ? JSON.parse(userStr) : null;
+    } catch (error) {
+      console.error('Error parsing stored user data:', error);
+      return null;
+    }
+  }
+
+  /**
+   * Get stored access token from localStorage
+   * @returns {string|null} Access token or null if not found
+   */
+  getStoredToken() {
+    return localStorage.getItem('access_token');
+  }
+}
+
+// Export singleton instance
+const authService = new AuthService();
+export default authService;

src/frontend/src/services/documentService.js

@@ -0,0 +1,97 @@
+/**
+ * Document Service
+ * Handles all API calls related to documents
+ * Currently using mock data for development
+ */
+
+import { mockDocuments, availableTags, availableCategories } from '../utils/mockData';
+import api from '../utils/api';
+
+// Simulate network delay
+const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));
+
+/**
+ * Fetches all documents from the API
+ * @returns {Promise<Array>} Array of document objects
+ */
+export const getAllDocuments = async () => {
+  try {
+    const response = await api.get('/api/documents');
+    return response.data;
+  } catch (error) {
+    console.error('Failed to fetch documents:', error);
+    // Fallback to mock data in case of API error during development
+    console.warn('Falling back to mock data');
+  }
+};
+
+/**
+ * Fetches a single document by ID
+ * @param {string} id - Document ID
+ * @returns {Promise<Object|null>} Document object or null if not found
+ */
+export const getDocumentById = async (id) => {
+  await delay(300);
+  const document = mockDocuments.find(doc => doc.id === id);
+  return document || null;
+};
+
+/**
+ * Updates a document's tags and categories
+ * @param {string} id - Document ID
+ * @param {Object} updates - Object containing tags and/or categories
+ * @param {Array<string>} updates.tags - New tags array
+ * @param {Array<string>} updates.categories - New categories array
+ * @returns {Promise<Object>} Updated document object
+ */
+export const updateDocument = async (id, updates) => {
+  await delay(400);
+
+  const index = mockDocuments.findIndex(doc => doc.id === id);
+  if (index === -1) {
+    throw new Error('Document not found');
+  }
+
+  // Update the document
+  mockDocuments[index] = {
+    ...mockDocuments[index],
+    ...updates
+  };
+
+  return mockDocuments[index];
+};
+
+/**
+ * Deletes a document
+ * @param {string} id - Document ID
+ * @returns {Promise<boolean>} True if deletion was successful
+ */
+export const deleteDocument = async (id) => {
+  await delay(300);
+
+  const index = mockDocuments.findIndex(doc => doc.id === id);
+  if (index === -1) {
+    throw new Error('Document not found');
+  }
+
+  mockDocuments.splice(index, 1);
+  return true;
+};
+
+/**
+ * Gets all available tags
+ * @returns {Promise<Array<string>>} Array of tag strings
+ */
+export const getAvailableTags = async () => {
+  await delay(200);
+  return [...availableTags];
+};
+
+/**
+ * Gets all available categories
+ * @returns {Promise<Array<string>>} Array of category strings
+ */
+export const getAvailableCategories = async () => {
+  await delay(200);
+  return [...availableCategories];
+};

src/frontend/src/utils/api.js

@@ -0,0 +1,57 @@
+import axios from 'axios';
+
+// Base API configuration
+const API_BASE_URL = 'http://localhost:8000';
+
+// Create axios instance with default configuration
+const api = axios.create({
+  baseURL: API_BASE_URL,
+  timeout: 10000, // 10 seconds timeout
+  headers: {
+    'Content-Type': 'application/json',
+  },
+});
+
+export { API_BASE_URL };
+
+// Request interceptor to add authentication token
+api.interceptors.request.use(
+  (config) => {
+    // Get token from localStorage
+    const token = localStorage.getItem('access_token');
+    if (token) {
+      config.headers.Authorization = `Bearer ${token}`;
+    }
+    return config;
+  },
+  (error) => {
+    return Promise.reject(error);
+  }
+);
+
+// Response interceptor to handle common errors
+api.interceptors.response.use(
+  (response) => {
+    return response;
+  },
+  (error) => {
+    // Handle 401 errors (unauthorized)
+    if (error.response?.status === 401) {
+      // Clear token from localStorage on 401
+      localStorage.removeItem('access_token');
+      localStorage.removeItem('user');
+
+      // Redirect to login page
+      window.location.href = '/login';
+    }
+
+    // Handle other common errors
+    if (error.response?.status >= 500) {
+      console.error('Server error:', error.response.data);
+    }
+
+    return Promise.reject(error);
+  }
+);
+
+export default api;

src/frontend/src/utils/mockData.js

@@ -0,0 +1,155 @@
+/**
+ * Mock data for PDF documents
+ * This file provides sample data for development and testing purposes
+ */
+
+/**
+ * Generates a placeholder thumbnail URL
+ * @param {number} index - Document index for unique colors
+ * @returns {string} Placeholder image URL
+ */
+const generateThumbnailUrl = (index) => {
+  const colors = ['3B82F6', '10B981', 'F59E0B', 'EF4444', '8B5CF6', 'EC4899'];
+  const color = colors[index % colors.length];
+  return `https://via.placeholder.com/300x400/${color}/FFFFFF?text=Page+1`;
+};
+
+/**
+ * Mock documents data
+ * @type {Array<Object>}
+ */
+export const mockDocuments = [
+  {
+    id: 'doc-001',
+    name: 'Contrat-2025.pdf',
+    originalFileType: 'DOCX',
+    createdAt: '2025-10-01T10:30:00Z',
+    fileSize: 2048576, // 2 MB
+    pageCount: 12,
+    thumbnailUrl: generateThumbnailUrl(0),
+    pdfUrl: '/mock/contrat-2025.pdf',
+    tags: ['contrat', '2025'],
+    categories: ['legal']
+  },
+  {
+    id: 'doc-002',
+    name: 'Facture-Janvier.pdf',
+    originalFileType: 'XLSX',
+    createdAt: '2025-09-15T14:20:00Z',
+    fileSize: 512000, // 512 KB
+    pageCount: 3,
+    thumbnailUrl: generateThumbnailUrl(1),
+    pdfUrl: '/mock/facture-janvier.pdf',
+    tags: ['facture', 'comptabilité'],
+    categories: ['finance']
+  },
+  {
+    id: 'doc-003',
+    name: 'Présentation-Projet.pdf',
+    originalFileType: 'PPTX',
+    createdAt: '2025-09-28T09:15:00Z',
+    fileSize: 5242880, // 5 MB
+    pageCount: 24,
+    thumbnailUrl: generateThumbnailUrl(2),
+    pdfUrl: '/mock/presentation-projet.pdf',
+    tags: ['présentation', 'projet'],
+    categories: ['marketing']
+  },
+  {
+    id: 'doc-004',
+    name: 'Photo-Identité.pdf',
+    originalFileType: 'JPG',
+    createdAt: '2025-10-05T16:45:00Z',
+    fileSize: 204800, // 200 KB
+    pageCount: 1,
+    thumbnailUrl: generateThumbnailUrl(3),
+    pdfUrl: '/mock/photo-identite.pdf',
+    tags: ['photo', 'identité'],
+    categories: ['personnel']
+  },
+  {
+    id: 'doc-005',
+    name: 'Manuel-Utilisateur.pdf',
+    originalFileType: 'PDF',
+    createdAt: '2025-09-20T11:00:00Z',
+    fileSize: 3145728, // 3 MB
+    pageCount: 45,
+    thumbnailUrl: generateThumbnailUrl(4),
+    pdfUrl: '/mock/manuel-utilisateur.pdf',
+    tags: ['manuel', 'documentation'],
+    categories: ['technique']
+  },
+  {
+    id: 'doc-006',
+    name: 'Rapport-Annuel.pdf',
+    originalFileType: 'DOCX',
+    createdAt: '2025-08-30T13:30:00Z',
+    fileSize: 4194304, // 4 MB
+    pageCount: 67,
+    thumbnailUrl: generateThumbnailUrl(5),
+    pdfUrl: '/mock/rapport-annuel.pdf',
+    tags: ['rapport', 'annuel'],
+    categories: ['finance', 'management']
+  },
+  {
+    id: 'doc-007',
+    name: 'CV-Candidat.pdf',
+    originalFileType: 'DOCX',
+    createdAt: '2025-10-02T08:00:00Z',
+    fileSize: 153600, // 150 KB
+    pageCount: 2,
+    thumbnailUrl: generateThumbnailUrl(0),
+    pdfUrl: '/mock/cv-candidat.pdf',
+    tags: ['cv', 'recrutement'],
+    categories: ['rh']
+  },
+  {
+    id: 'doc-008',
+    name: 'Devis-Travaux.pdf',
+    originalFileType: 'XLSX',
+    createdAt: '2025-09-25T15:20:00Z',
+    fileSize: 409600, // 400 KB
+    pageCount: 5,
+    thumbnailUrl: generateThumbnailUrl(1),
+    pdfUrl: '/mock/devis-travaux.pdf',
+    tags: ['devis', 'travaux'],
+    categories: ['finance']
+  }
+];
+
+/**
+ * Available tags for documents
+ * @type {Array<string>}
+ */
+export const availableTags = [
+  'contrat',
+  'facture',
+  'présentation',
+  'photo',
+  'manuel',
+  'rapport',
+  'cv',
+  'devis',
+  'comptabilité',
+  'projet',
+  'identité',
+  'documentation',
+  'annuel',
+  'recrutement',
+  'travaux',
+  '2025'
+];
+
+/**
+ * Available categories for documents
+ * @type {Array<string>}
+ */
+export const availableCategories = [
+  'legal',
+  'finance',
+  'marketing',
+  'personnel',
+  'technique',
+  'management',
+  'rh'
+];

src/frontend/tailwind.config.js

@@ -0,0 +1,15 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    "./index.html",
+    "./src/**/*.{js,ts,jsx,tsx}",
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [require("daisyui")],
+  daisyui: {
+    themes: ["light", "dark", "cupcake"],
+    darkTheme: "dark",
+  },
+}

src/frontend/vite.config.js

@@ -1,7 +1,8 @@
-import { defineConfig } from 'vite'
+import {defineConfig} from 'vite'
+import tailwindcss from '@tailwindcss/vite'
 import react from '@vitejs/plugin-react'
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [tailwindcss(), react()],
 })

src/worker/Dockerfile

@@ -3,12 +3,26 @@ FROM python:3.12-slim
 # Set working directory
 WORKDIR /app
 
+# Install libmagic
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libmagic1 \
+    file \
+    pandoc \
+    ghostscript \
+    texlive-xetex \
+ && rm -rf /var/lib/apt/lists/*
+
+
 # Copy requirements and install dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Change the user
+USER 1002:1002
+
 # Copy application code
-COPY tasks/ .
+COPY . .
+
 
 # Command will be overridden by docker-compose
 CMD ["celery", "-A", "main", "worker", "--loglevel=info"]

src/worker/requirements.txt

@@ -1,4 +1,20 @@
-
+asgiref==3.9.1
+bcrypt==4.3.0
 celery==5.5.3
-redis==6.4.0
+email-validator==2.3.0
+fastapi==0.116.1
+httptools==0.6.4
+motor==3.7.1
+pikepdf==9.11.0
+pillow==11.3.0
+pydantic==2.11.9
+PyJWT==2.10.1
 pymongo==4.15.0
+PyMuPDF==1.26.4
+pypandoc==1.15
+python-multipart==0.0.20
+redis==6.4.0
+reportlab==4.4.4
+uvicorn==0.35.0
+python-magic==0.4.27
+watchdog==6.0.0

src/worker/tasks/common/converter_utils.py

@@ -0,0 +1,73 @@
+import subprocess
+from pathlib import Path
+
+import magic  # python-magic
+
+
+class UnsupportedFileTypeError(Exception):
+  """Exception raised when a file type is not supported."""
+  pass
+
+
+def detect_file_type(file_path: str) -> str:
+  """
+  Detect the type of file using python-magic.
+
+  Returns:
+      'text', 'image', 'word'
+
+  Raises:
+      UnsupportedFileTypeError: If file type is not supported.
+  """
+  mime = magic.from_file(file_path, mime=True)
+  extension = Path(file_path).suffix
+  if mime.startswith("text/"):
+    return "text"
+  elif mime.startswith("image/"):
+    return "image"
+  elif mime in ("application/vnd.openxmlformats-officedocument.wordprocessingml.document",):
+    return "word"
+  elif mime == "application/pdf":
+    return "pdf"
+  elif mime == "application/vnd.ms-powerpoint":
+    return "powerpoint"
+  elif mime == "application/octet-stream" and extension in (".jpg", ".jpeg", ".png", ".gif"):
+    return "image"
+  else:
+    raise UnsupportedFileTypeError(f"Unsupported file type: {mime}")
+
+
+def compress_pdf(input_pdf: str, output_pdf: str, quality: str = "ebook") -> None:
+  """
+  Compress a PDF using Ghostscript.
+
+  Args:
+      input_pdf (str): Path to the input PDF.
+      output_pdf (str): Path to save the compressed PDF.
+      quality (str): Ghostscript PDFSETTINGS option: screen, ebook, printer, prepress.
+
+  Raises:
+      FileNotFoundError: If input PDF does not exist.
+      RuntimeError: If Ghostscript returns an error.
+  """
+  input_path = Path(input_pdf)
+  output_path = Path(output_pdf)
+  
+  if not input_path.exists():
+    raise FileNotFoundError(f"Input PDF not found: {input_pdf}")
+  
+  cmd = [
+      "gs",
+      "-sDEVICE=pdfwrite",
+      "-dCompatibilityLevel=1.4",
+      f"-dPDFSETTINGS=/{quality}",
+      "-dNOPAUSE",
+      "-dQUIET",
+      "-dBATCH",
+      f"-sOutputFile={str(output_path)}",
+      str(input_path),
+  ]
+  
+  result = subprocess.run(cmd)
+  if result.returncode != 0:
+    raise RuntimeError(f"Ghostscript failed with return code {result.returncode}")

src/worker/tasks/common/document_utils.py

@@ -0,0 +1,64 @@
+import hashlib
+import logging
+import os
+from pathlib import Path
+
+from app.config import settings
+
+logger = logging.getLogger(__name__)
+
+
+def get_file_hash(file_bytes: bytes) -> str:
+  """
+  Calculate SHA256 hash of file content.
+
+  Args:
+      file_bytes: Raw file content as bytes
+
+  Returns:
+      Hexadecimal SHA256 hash string
+  """
+  return hashlib.sha256(file_bytes).hexdigest()
+
+
+def get_object_path(file_hash):
+  """
+
+  :param file_hash:
+  :return:
+  """
+  root = settings.get_objects_folder()
+  return os.path.join(root, file_hash[:24], file_hash)
+
+
+def save_as_object(file_path, remove_on_success=True) -> str:
+  """
+  Read the file, get the hash and save using the hash as the filename.
+  :param file_path:
+  :param remove_on_success:
+  :return: hash of the file
+  """
+  logger.info(f"Saving file {file_path} as object")
+  path = Path(file_path)
+  as_bytes = path.read_bytes()
+  
+  file_hash = get_file_hash(as_bytes)
+  logger.info(f"File hash: {file_hash}")
+  
+  object_path = get_object_path(file_hash)
+  if os.path.exists(object_path):
+    logger.info(f"Object already exists: {object_path}")
+    return file_hash
+  
+  if not os.path.exists(os.path.dirname(object_path)):
+    os.makedirs(os.path.dirname(object_path))
+  
+  logger.info(f"Saving object to: {object_path}")
+  with open(object_path, "wb") as f:
+    f.write(as_bytes)
+  
+  if remove_on_success:
+    logger.info(f"Removing file: {file_path}")
+    path.unlink()
+  
+  return file_hash

src/worker/tasks/document_processing.py

@@ -0,0 +1,119 @@
+"""
+Celery tasks for document processing with ProcessingJob status management.
+
+This module contains Celery tasks that handle document content extraction
+and update processing job statuses throughout the task lifecycle.
+"""
+
+import logging
+import os
+from typing import Any, Dict
+
+from app.config import settings
+from app.database.connection import get_database
+from app.models.job import ProcessingStatus
+from app.services.document_service import DocumentService, DocumentAlreadyExists
+from app.services.job_service import JobService
+from tasks.main import celery_app
+
+logger = logging.getLogger(__name__)
+
+
+def get_services():
+  database = get_database()
+  document_service = DocumentService(database=database, objects_folder=settings.get_objects_folder())
+  job_service = JobService(database=database)
+  return document_service, job_service
+
+
+# @celery_app.task(bind=True, autoretry_for=(Exception,), retry_kwargs={'max_retries': 3, 'countdown': 60})
+@celery_app.task(bind=True)
+def process_document(self, filepath: str) -> Dict[str, Any]:
+  """
+  Process a document file and extract its content.
+
+  This task:
+  1. Updates the processing job status to PROCESSING
+  2. Performs document content extraction
+  3. Updates job status to COMPLETED or FAILED based on result
+
+  Args:
+      self : Celery task instance
+      filepath: Full path to the document file to process
+
+  Returns:
+      Dictionary containing processing results
+
+  Raises:
+      Exception: Any processing error (will trigger retry)
+  """
+  task_id = self.request.id
+  logger.info(f'Task {task_id} : Starting document processing for file: "{filepath}"')
+  
+  # get services
+  document_service, job_service = get_services()
+  
+  job = None
+  document = None
+  try:
+    # Step 1: Create the document and a new job record for the document
+    document = document_service.create_document(filepath)
+    job = job_service.create_job(task_id=task_id, document_id=document.id)
+    job_service.mark_job_as_started(job_id=job.id)
+    logger.info(f'Task {task_id} : Created document "{document.id}". Started job "{job.id}"')
+    
+    logger.info(f"Task {task_id} : Creating associated PDF")
+    job_service.update_job_status(job_id=job.id, status=ProcessingStatus.SAVING_PDF)
+    document_service.create_pdf(document.id)
+    
+    logger.info(f"Task {task_id} : Creating thumbnail")
+    job_service.update_job_status(job_id=job.id, status=ProcessingStatus.CREATING_THUMBNAIL)
+    document_service.create_thumbnail(document.id)
+    
+    # remove the file from the watch folder
+    os.remove(filepath)
+    
+    # Step x: Mark job as completed
+    job_service.mark_job_as_completed(job_id=job.id)
+    logger.info(f"Task {task_id} marked as COMPLETED")
+    
+    return {
+        "task_id": task_id,
+        "filepath": filepath,
+        "status": "completed",
+    }
+  
+  except DocumentAlreadyExists as e:
+    logger.info(f"Task {task_id} completed: {str(e)}")
+    if job is not None:
+      job_service.mark_job_as_completed(job_id=job.id)
+      logger.info(f"Job {task_id} marked as COMPLETED")
+    
+    return {
+        "task_id": task_id,
+        "filepath": filepath,
+        "status": "completed",
+        "message": str(e),
+    }
+  
+  except Exception as e:
+    error_message = f"Document processing failed: {str(e)}"
+    logger.error(f"Task {task_id} failed: {error_message}")
+    
+    try:
+      # Mark job as failed
+      if job is not None:
+        job_service.mark_job_as_failed(job_id=job.id, error_message=error_message)
+        logger.info(f"Job {task_id} marked as FAILED")
+      else:
+        logger.error(f"Failed to process {filepath}. error = {str(e)}")
+      
+      if document is not None:
+        document_service.move_to_errors(document.id, filepath)
+        logger.info(f"Moved file {filepath} to errors/{document.id}")
+    
+    except Exception as job_error:
+      logger.error(f"Failed to update job status for task {task_id}: {str(job_error)}")
+    
+    # Re-raise the exception to trigger Celery retry mechanism
+    raise

src/worker/tasks/main.py

@@ -3,24 +3,31 @@ Celery worker for MyDocManager document processing tasks.
 
 This module contains all Celery tasks for processing documents.
 """
-
+import logging
 import os
-import time
+
 from celery import Celery
+from celery.signals import worker_process_init
+
+from app.config import settings
 
 # Environment variables
-REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379/0")
-MONGODB_URL = os.getenv("MONGODB_URL", "mongodb://localhost:27017")
+REDIS_URL = settings.get_redis_url()
+MONGODB_URL = settings.get_mongodb_url()
+
+logger = logging.getLogger(__name__)
 
 # Initialize Celery app
-app = Celery(
+celery_app = Celery(
   "mydocmanager_worker",
   broker=REDIS_URL,
-  backend=REDIS_URL
+  backend=REDIS_URL,
 )
 
+celery_app.autodiscover_tasks(["tasks.document_processing"])
+
 # Celery configuration
-app.conf.update(
+celery_app.conf.update(
   task_serializer="json",
   accept_content=["json"],
   result_serializer="json",
@@ -32,82 +39,15 @@ app.conf.update(
 )
 
 
-@app.task(bind=True)
-def test_task(self, message: str):
-  """
-  Test task for validating worker functionality.
-
-  Args:
-      message: Test message to process
-
-  Returns:
-      dict: Task result with processing information
-  """
-  try:
-    print(f"[WORKER] Starting test task with message: {message}")
-    
-    # Simulate some work
-    for i in range(5):
-      print(f"[WORKER] Processing step {i + 1}/5...")
-      time.sleep(1)
-      
-      # Update task progress
-      self.update_state(
-        state="PROGRESS",
-        meta={
-            "current": i + 1,
-            "total": 5,
-            "message": f"Processing step {i + 1}"
-        }
-      )
-    
-    result = {
-        "status": "completed",
-        "message": f"Successfully processed: {message}",
-        "processed_at": time.time(),
-        "worker_id": self.request.id
-    }
-    
-    print(f"[WORKER] Test task completed successfully: {result}")
-    return result
-  
-  except Exception as exc:
-    print(f"[WORKER] Test task failed: {str(exc)}")
-    raise self.retry(exc=exc, countdown=60, max_retries=3)
+def global_init(**kwargs):
+  """Initialize global variables."""
+  logger.info(f"{'*' * 45}")
+  logger.info(f"{'--' * 5}" + " Starting MyDocManager worker " + f"{'--' * 5}")
+  logger.info(f"{'*' * 45}")
 
 
-@app.task(bind=True)
-def process_document_task(self, file_path: str):
-  """
-  Placeholder task for document processing.
-
-  Args:
-      file_path: Path to the document to process
-
-  Returns:
-      dict: Processing result
-  """
-  try:
-    print(f"[WORKER] Starting document processing for: {file_path}")
-    
-    # Placeholder for document processing logic
-    time.sleep(2)  # Simulate processing time
-    
-    result = {
-        "status": "completed",
-        "file_path": file_path,
-        "processed_at": time.time(),
-        "content": f"Placeholder content for {file_path}",
-        "worker_id": self.request.id
-    }
-    
-    print(f"[WORKER] Document processing completed: {file_path}")
-    return result
-  
-  except Exception as exc:
-    print(f"[WORKER] Document processing failed for {file_path}: {str(exc)}")
-    raise self.retry(exc=exc, countdown=60, max_retries=3)
-
+global_init()
 
 if __name__ == "__main__":
-  app.start()
+  global_init()
+  celery_app.start()

tests/api/test_auth_routes.py

@@ -0,0 +1,149 @@
+from datetime import datetime
+from unittest.mock import MagicMock
+
+import pytest
+from fastapi import status, HTTPException
+from fastapi.testclient import TestClient
+from mongomock.mongo_client import MongoClient
+
+from app.api.dependencies import get_auth_service, get_user_service, get_current_user
+from app.main import app  # Assuming you have FastAPI app defined in app/main.py
+from app.models.auth import UserRole
+from app.models.types import PyObjectId
+from app.models.user import UserInDB
+from app.services.auth_service import AuthService
+from app.services.user_service import UserService
+
+
+@pytest.fixture
+def client():
+  return TestClient(app)
+
+
+@pytest.fixture
+def fake_user():
+  return UserInDB(
+    _id=PyObjectId(),
+    username="testuser",
+    email="test@example.com",
+    role=UserRole.USER,
+    is_active=True,
+    hashed_password="hashed-secret",
+    created_at=datetime(2025, 1, 1),
+    updated_at=datetime(2025, 1, 2),
+  )
+
+
+def override_auth_service():
+  mock = MagicMock(spec=AuthService)
+  mock.verify_user_password.return_value = True
+  mock.create_access_token.return_value = "fake-jwt-token"
+  return mock
+
+
+def override_user_service(fake_user):
+  mock = MagicMock(spec=UserService)
+  mock.get_user_by_username.return_value = fake_user
+  return mock
+
+
+def override_get_current_user(fake_user):
+  def _override():
+    return fake_user
+  
+  return _override
+
+
+def override_get_database():
+  def _override():
+    client = MongoClient()
+    db = client.test_database
+    return db
+  
+  return _override
+
+
+# ---------------------- TESTS FOR /auth/login ----------------------
+class TestLogin:
+  def test_i_can_login_with_valid_credentials(self, client, fake_user):
+    auth_service = override_auth_service()
+    user_service = override_user_service(fake_user)
+    
+    client.app.dependency_overrides[get_auth_service] = lambda: auth_service
+    client.app.dependency_overrides[get_user_service] = lambda: user_service
+    
+    response = client.post(
+      "/auth/login",
+      data={"username": "testuser", "password": "secret"},
+    )
+    
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert "access_token" in data
+    assert data["user"]["username"] == "testuser"
+  
+  def test_i_cannot_login_with_invalid_username(self, client):
+    auth_service = override_auth_service()
+    user_service = MagicMock(spec=UserService)
+    user_service.get_user_by_username.return_value = None
+    
+    client.app.dependency_overrides[get_auth_service] = lambda: auth_service
+    client.app.dependency_overrides[get_user_service] = lambda: user_service
+    
+    response = client.post(
+      "/auth/login",
+      data={"username": "unknown", "password": "secret"},
+    )
+    
+    assert response.status_code == status.HTTP_401_UNAUTHORIZED
+  
+  def test_i_cannot_login_with_inactive_user(self, client, fake_user):
+    fake_user.is_active = False
+    auth_service = override_auth_service()
+    user_service = override_user_service(fake_user)
+    client.app.dependency_overrides[get_auth_service] = lambda: auth_service
+    client.app.dependency_overrides[get_user_service] = lambda: user_service
+    
+    response = client.post(
+      "/auth/login",
+      data={"username": "testuser", "password": "secret"},
+    )
+    
+    assert response.status_code == status.HTTP_401_UNAUTHORIZED
+  
+  def test_i_cannot_login_with_wrong_password(self, client, fake_user):
+    auth_service = override_auth_service()
+    auth_service.verify_user_password.return_value = False
+    user_service = override_user_service(fake_user)
+    client.app.dependency_overrides[get_auth_service] = lambda: auth_service
+    client.app.dependency_overrides[get_user_service] = lambda: user_service
+    
+    response = client.post(
+      "/auth/login",
+      data={"username": "testuser", "password": "wrong"},
+    )
+    
+    assert response.status_code == status.HTTP_401_UNAUTHORIZED
+
+
+# ---------------------- TESTS FOR /auth/me ----------------------
+class TesteMe:
+  def test_i_can_get_current_user_profile(self, client, fake_user):
+    client.app.dependency_overrides[get_current_user] = override_get_current_user(fake_user)
+    
+    response = client.get("/auth/me")
+    
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["username"] == fake_user.username
+    assert data["email"] == fake_user.email
+  
+  def test_i_cannot_get_profile_without_authentication(self, client, monkeypatch):
+    def raise_http_exception():
+      raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED)
+    
+    client.app.dependency_overrides[get_current_user] = raise_http_exception
+    
+    response = client.get("/auth/me")
+    
+    assert response.status_code == status.HTTP_401_UNAUTHORIZED

tests/api/test_users.py

@@ -0,0 +1,167 @@
+# File: tests/api/test_users.py
+from datetime import datetime
+from unittest.mock import MagicMock
+
+import pytest
+from fastapi import status
+from fastapi.testclient import TestClient
+
+from app.api.dependencies import get_admin_user, get_user_service
+from app.main import app
+from app.models.auth import UserRole
+from app.models.types import PyObjectId
+from app.models.user import UserInDB, UserCreate
+from app.services.user_service import UserService
+
+
+# -----------------------
+# Fixtures
+# -----------------------
+
+@pytest.fixture
+def fake_user_admin():
+  return UserInDB(
+    _id=PyObjectId(),
+    username="admin",
+    email="admin@example.com",
+    role=UserRole.ADMIN,
+    is_active=True,
+    hashed_password="hashed-secret",
+    created_at=datetime(2025, 1, 1),
+    updated_at=datetime(2025, 1, 2),
+  )
+
+
+@pytest.fixture
+def fake_user_response():
+  return UserInDB(
+    _id=PyObjectId(),
+    username="other",
+    email="other@example.com",
+    role=UserRole.USER,
+    is_active=True,
+    hashed_password="hashed-secret-2",
+    created_at=datetime(2025, 1, 1),
+    updated_at=datetime(2025, 1, 2),
+  )
+
+
+@pytest.fixture
+def client(fake_user_admin):
+  # Fake admin dependency
+  def get_admin_user_override():
+    return fake_user_admin
+  
+  # Fake user service
+  user_service_mock = MagicMock(spec=UserService)
+  
+  def get_user_service_override():
+    return user_service_mock
+  
+  client = TestClient(app)
+  client.app.dependency_overrides = {
+      get_admin_user: get_admin_user_override,
+      get_user_service: get_user_service_override
+  }
+  
+  client.user_service_mock = user_service_mock
+  return client
+
+
+# -----------------------
+# Tests
+# -----------------------
+
+class TestListUsers:
+  
+  def test_i_can_list_users(self, client, fake_user_admin, fake_user_response):
+    client.user_service_mock.list_users.return_value = [fake_user_admin, fake_user_response]
+    response = client.get("/users")
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert len(data) == 2
+    assert data[0]["username"] == "admin"
+  
+  def test_i_can_list_users_when_empty(self, client):
+    client.user_service_mock.list_users.return_value = []
+    response = client.get("/users")
+    assert response.status_code == status.HTTP_200_OK
+    assert response.json() == []
+
+
+class TestGetUserById:
+  
+  def test_i_can_get_user_by_id(self, client, fake_user_response):
+    client.user_service_mock.get_user_by_id.return_value = fake_user_response
+    response = client.get(f"/users/{fake_user_response.id}")
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["username"] == fake_user_response.username
+  
+  def test_i_cannot_get_user_by_id_not_found(self, client):
+    client.user_service_mock.get_user_by_id.return_value = None
+    response = client.get("/users/64f0c9f4b0d1c8b7b8e1f0a2")
+    assert response.status_code == status.HTTP_404_NOT_FOUND
+    assert response.json()["detail"] == "User not found"
+
+
+class TestCreateUser:
+  
+  def test_i_can_create_user(self, client, fake_user_response):
+    user_data = UserCreate(username="newuser",
+                           email="new@example.com",
+                           password="#Passw0rd!",
+                           role=UserRole.USER)
+    
+    client.user_service_mock.create_user.return_value = fake_user_response
+    response = client.post("/users", json=user_data.model_dump(mode="json"))
+    assert response.status_code == status.HTTP_201_CREATED
+    data = response.json()
+    assert data["username"] == fake_user_response.username
+  
+  def test_i_cannot_create_user_when_service_raises_value_error(self, client):
+    user_data = {"username": "baduser", "email": "bad@example.com", "role": "user", "password": "password"}
+    client.user_service_mock.create_user.side_effect = ValueError("Invalid data")
+    response = client.post("/users", json=user_data)
+    assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY
+
+
+class TestUpdateUser:
+  
+  def test_i_can_update_user(self, client, fake_user_response):
+    user_data = {"username": "updateduser", "email": "updated@example.com"}
+    client.user_service_mock.update_user.return_value = fake_user_response
+    response = client.put(f"/users/{fake_user_response.id}", json=user_data)
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["username"] == fake_user_response.username
+  
+  def test_i_cannot_update_user_not_found(self, client):
+    client.user_service_mock.update_user.return_value = None
+    user_data = {"username": "updateduser"}
+    response = client.put("/users/64f0c9f4b0d1c8b7b8e1f0a2", json=user_data)
+    assert response.status_code == status.HTTP_404_NOT_FOUND
+    assert response.json()["detail"] == "User not found"
+  
+  def test_i_cannot_update_user_when_service_raises_value_error(self, client):
+    client.user_service_mock.update_user.side_effect = ValueError("Invalid update")
+    user_data = {"username": "badupdate"}
+    response = client.put("/users/64f0c9f4b0d1c8b7b8e1f0a2", json=user_data)
+    assert response.status_code == status.HTTP_400_BAD_REQUEST
+    assert response.json()["detail"] == "Invalid update"
+
+
+class TestDeleteUser:
+  
+  def test_i_can_delete_user(self, client):
+    client.user_service_mock.delete_user.return_value = True
+    response = client.delete("/users/64f0c9f4b0d1c8b7b8e1f0a1")
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["message"] == "User successfully deleted"
+  
+  def test_i_cannot_delete_user_not_found(self, client):
+    client.user_service_mock.delete_user.return_value = False
+    response = client.delete("/users/64f0c9f4b0d1c8b7b8e1f0a2")
+    assert response.status_code == status.HTTP_404_NOT_FOUND
+    assert response.json()["detail"] == "User not found"

tests/common/test_utils.py

@@ -0,0 +1,52 @@
+import shutil
+import tempfile
+from pathlib import Path
+
+import pytest
+
+from tasks.common.converter_utils import detect_file_type, UnsupportedFileTypeError
+
+
+@pytest.fixture
+def temp_dir():
+  """Create a temporary directory for output PDFs."""
+  dir_path = tempfile.mkdtemp()
+  yield dir_path
+  shutil.rmtree(dir_path)
+
+
+def test_i_can_detect_text_file(temp_dir):
+  txt_file = Path(temp_dir) / "sample.txt"
+  txt_file.write_text("Sample text content")
+  detected_type = detect_file_type(str(txt_file))
+  assert detected_type == "text"
+
+
+def test_i_can_detect_image_file(temp_dir):
+  from PIL import Image
+  
+  img_file = Path(temp_dir) / "sample.jpg"
+  image = Image.new("RGB", (50, 50), color="blue")
+  image.save(img_file)
+  
+  detected_type = detect_file_type(str(img_file))
+  assert detected_type == "image"
+
+
+def test_i_can_detect_word_file(temp_dir):
+  import docx
+  
+  docx_file = Path(temp_dir) / "sample.docx"
+  doc = docx.Document()
+  doc.add_paragraph("Sample content")
+  doc.save(docx_file)
+  
+  detected_type = detect_file_type(str(docx_file))
+  assert detected_type == "word"
+
+
+def test_i_cannot_detect_unsupported_file(temp_dir):
+  exe_file = Path(temp_dir) / "sample.exe"
+  exe_file.write_bytes(b'\x4D\x5A\x90\x00\x03\x00\x00\x00')
+  with pytest.raises(UnsupportedFileTypeError):
+    detect_file_type(str(exe_file))

tests/models/test_user_models.py

@@ -10,8 +10,8 @@ from pydantic import ValidationError
 from datetime import datetime
 from bson import ObjectId
 
-from app.models.user import UserCreate, UserUpdate, UserInDB, UserResponse
-from app.models.auth import UserRole
+from app.models.user import UserCreate, UserUpdate, UserInDB
+from app.models.auth import UserRole, UserResponse
 
 
 class TestUserCreateModel:
@@ -262,14 +262,14 @@ class TestUserInDBModel:
   def test_i_can_create_user_in_db_model(self):
     """Test creation of valid UserInDB model with all fields."""
     user_id = ObjectId()
-    created_at = datetime.utcnow()
-    updated_at = datetime.utcnow()
+    created_at = datetime.now()
+    updated_at = datetime.now()
     
     user_data = {
         "id": user_id,
         "username": "testuser",
         "email": "test@example.com",
-        "password_hash": "$2b$12$hashedpassword",
+        "hashed_password": "$2b$12$hashedpassword",
         "role": UserRole.USER,
         "is_active": True,
         "created_at": created_at,
@@ -281,29 +281,12 @@ class TestUserInDBModel:
     assert user.id == user_id
     assert user.username == "testuser"
     assert user.email == "test@example.com"
-    assert user.password_hash == "$2b$12$hashedpassword"
+    assert user.hashed_password == "$2b$12$hashedpassword"
     assert user.role == UserRole.USER
     assert user.is_active is True
     assert user.created_at == created_at
     assert user.updated_at == updated_at
 
-  def test_i_can_create_inactive_user(self):
-    """Test creation of inactive user."""
-    user_data = {
-        "id": ObjectId(),
-        "username": "testuser",
-        "email": "test@example.com",
-        "password_hash": "$2b$12$hashedpassword",
-        "role": UserRole.USER,
-        "is_active": False,
-        "created_at": datetime.utcnow(),
-        "updated_at": datetime.utcnow()
-    }
-    
-    user = UserInDB(**user_data)
-    
-    assert user.is_active is False
-
 
 class TestUserResponseModel:
   """Tests for UserResponse Pydantic model (API response)."""
@@ -311,8 +294,8 @@ class TestUserResponseModel:
   def test_i_can_create_user_response_model(self):
     """Test creation of valid UserResponse model without password."""
     user_id = ObjectId()
-    created_at = datetime.utcnow()
-    updated_at = datetime.utcnow()
+    created_at = datetime.now()
+    updated_at = datetime.now()
     
     user_data = {
         "id": user_id,
@@ -350,14 +333,14 @@ class TestUserResponseModel:
   def test_i_can_convert_user_in_db_to_response(self):
     """Test conversion from UserInDB to UserResponse model."""
     user_id = ObjectId()
-    created_at = datetime.utcnow()
-    updated_at = datetime.utcnow()
+    created_at = datetime.now()
+    updated_at = datetime.now()
     
     user_in_db = UserInDB(
       id=user_id,
       username="testuser",
       email="test@example.com",
-      password_hash="$2b$12$hashedpassword",
+      hashed_password="$2b$12$hashedpassword",
       role=UserRole.USER,
       is_active=True,
       created_at=created_at,
@@ -366,7 +349,7 @@ class TestUserResponseModel:
     
     # Convert to response model (excluding password_hash)
     user_response = UserResponse(
-      id=user_in_db.id,
+      _id=user_in_db.id,
       username=user_in_db.username,
       email=user_in_db.email,
       role=user_in_db.role,

tests/repositories/test_document_repository.py

@@ -0,0 +1,611 @@
+"""
+Test suite for FileDocumentRepository with async/support.
+
+This module contains comprehensive tests for all FileDocumentRepository methods
+using mongomock-motor for in-memory MongoDB testing.
+"""
+
+from datetime import datetime
+
+import pytest
+from bson import ObjectId
+from mongomock.mongo_client import MongoClient
+from pymongo.errors import PyMongoError
+
+from app.database.repositories.document_repository import (
+  FileDocumentRepository,
+  MatchMethodBase,
+  SubsequenceMatching,
+  FuzzyMatching
+)
+from app.models.document import FileDocument, FileType, ExtractionMethod
+
+
+@pytest.fixture
+def in_memory_repository():
+  """Create an in-memory FileDocumentRepository for testing."""
+  client = MongoClient()
+  db = client.test_database
+  repo = FileDocumentRepository(db)
+  repo.initialize()
+  return repo
+
+
+@pytest.fixture
+def sample_file_document():
+  """Sample FileDocument data for testing."""
+  return FileDocument(
+    filename="sample_document.pdf",
+    filepath="/home/user/documents/sample_document.pdf",
+    file_type=FileType.PDF,
+    extraction_method=ExtractionMethod.OCR,
+    metadata={"pages": 5, "language": "en", "author": "John Doe"},
+    detected_at=datetime.now(),
+    file_hash="a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456",
+    encoding="utf-8",
+    file_size=1024000,
+    mime_type="application/pdf"
+  )
+
+
+@pytest.fixture
+def sample_update_data():
+  """Sample update data for testing."""
+  return {
+      "extraction_method": ExtractionMethod.HYBRID,
+      "metadata": {"pages": 10, "language": "fr", "updated": True},
+      "file_size": 2048000
+  }
+
+
+@pytest.fixture
+def multiple_sample_files():
+  """Multiple FileDocument objects for list/search testing."""
+  base_time = datetime.now()
+  return [
+      FileDocument(
+        filename="first_doc.txt",
+        filepath="/docs/first_doc.txt",
+        file_type=FileType.TXT,
+        extraction_method=ExtractionMethod.DIRECT_TEXT,
+        metadata={"words": 500},
+        detected_at=base_time,
+        file_hash="hash1" + "0" * 58,
+        encoding="utf-8",
+        file_size=5000,
+        mime_type="text/plain"
+      ),
+      FileDocument(
+        filename="second_document.pdf",
+        filepath="/docs/second_document.pdf",
+        file_type=FileType.PDF,
+        extraction_method=ExtractionMethod.OCR,
+        metadata={"pages": 8},
+        detected_at=base_time,
+        file_hash="hash2" + "0" * 58,
+        encoding="utf-8",
+        file_size=10000,
+        mime_type="application/pdf"
+      ),
+      FileDocument(
+        filename="third_file.docx",
+        filepath="/docs/third_file.docx",
+        file_type=FileType.DOCX,
+        extraction_method=ExtractionMethod.HYBRID,
+        metadata={"paragraphs": 15},
+        detected_at=base_time,
+        file_hash="hash3" + "0" * 58,
+        encoding="utf-8",
+        file_size=15000,
+        mime_type="application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+      )
+  ]
+
+
+class TestFileDocumentRepositoryInitialization:
+  """Tests for repository initialization."""
+  
+  def test_i_can_initialize_repository(self):
+    """Test repository initialization."""
+    # Arrange
+    client = MongoClient()
+    db = client.test_database
+    repo = FileDocumentRepository(db)
+    repo.initialize()
+    
+    # Act & Assert (should not raise any exception)
+    assert repo.db is not None
+    assert repo.collection is not None
+    # TODO : check that the indexes are created
+
+
+class TestFileDocumentRepositoryCreation:
+  """Tests for file document creation functionality."""
+  
+  def test_i_can_create_file_document(self, in_memory_repository, sample_file_document):
+    """Test successful file document creation."""
+    # Act
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Assert
+    assert created_file is not None
+    assert created_file.filename == sample_file_document.filename
+    assert created_file.filepath == sample_file_document.filepath
+    assert created_file.file_type == sample_file_document.file_type
+    assert created_file.extraction_method == sample_file_document.extraction_method
+    assert created_file.metadata == sample_file_document.metadata
+    assert created_file.file_hash == sample_file_document.file_hash
+    assert created_file.file_size == sample_file_document.file_size
+    assert created_file.mime_type == sample_file_document.mime_type
+    assert created_file.id is not None
+    assert isinstance(created_file.id, ObjectId)
+  
+  def test_i_can_create_file_document_without_id(self, in_memory_repository, sample_file_document):
+    """Test creating file document with _id set to None (should be removed)."""
+    # Arrange
+    sample_file_document.id = None
+    
+    # Act
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Assert
+    assert created_file is not None
+    assert created_file.id is not None
+    assert isinstance(created_file.id, ObjectId)
+  
+  def test_i_cannot_create_file_document_with_pymongo_error(self, in_memory_repository,
+                                                            sample_file_document, mocker):
+    """Test handling of PyMongo errors during file document creation."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'insert_one', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(ValueError) as exc_info:
+      in_memory_repository.create_document(sample_file_document)
+    
+    assert "Failed to create file document" in str(exc_info.value)
+
+
+class TestFileDocumentRepositoryFinding:
+  """Tests for file document finding functionality."""
+  
+  def test_i_can_find_document_by_valid_id(self, in_memory_repository, sample_file_document):
+    """Test finding file document by valid ObjectId."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    found_file = in_memory_repository.find_document_by_id(str(created_file.id))
+    
+    # Assert
+    assert found_file is not None
+    assert found_file.id == created_file.id
+    assert found_file.filename == created_file.filename
+    assert found_file.filepath == created_file.filepath
+  
+  def test_i_cannot_find_document_with_invalid_id(self, in_memory_repository):
+    """Test that invalid ObjectId returns None."""
+    # Act
+    found_file = in_memory_repository.find_document_by_id("invalid_id")
+    
+    # Assert
+    assert found_file is None
+  
+  def test_i_cannot_find_document_by_nonexistent_id(self, in_memory_repository):
+    """Test that nonexistent but valid ObjectId returns None."""
+    # Arrange
+    nonexistent_id = str(ObjectId())
+    
+    # Act
+    found_file = in_memory_repository.find_document_by_id(nonexistent_id)
+    
+    # Assert
+    assert found_file is None
+  
+  def test_i_can_find_document_by_file_hash(self, in_memory_repository, sample_file_document):
+    """Test finding file document by file hash."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    found_file = in_memory_repository.find_document_by_hash(sample_file_document.file_hash)
+    
+    # Assert
+    assert found_file is not None
+    assert found_file.file_hash == created_file.file_hash
+    assert found_file.id == created_file.id
+  
+  def test_i_cannot_find_document_with_nonexistent_file_hash(self, in_memory_repository):
+    """Test that nonexistent file hash returns None."""
+    # Act
+    found_file = in_memory_repository.find_document_by_hash("nonexistent_hash")
+    
+    # Assert
+    assert found_file is None
+  
+  def test_i_can_find_document_by_filepath(self, in_memory_repository, sample_file_document):
+    """Test finding file document by filepath."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    found_file = in_memory_repository.find_document_by_filepath(sample_file_document.filepath)
+    
+    # Assert
+    assert found_file is not None
+    assert found_file.filepath == created_file.filepath
+    assert found_file.id == created_file.id
+  
+  def test_i_cannot_find_document_with_nonexistent_filepath(self, in_memory_repository):
+    """Test that nonexistent filepath returns None."""
+    # Act
+    found_file = in_memory_repository.find_document_by_filepath("/nonexistent/path/file.pdf")
+    
+    # Assert
+    assert found_file is None
+  
+  def test_i_cannot_find_document_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during file document finding."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find_one', side_effect=PyMongoError("Database error"))
+    
+    # Act
+    found_file = in_memory_repository.find_document_by_hash("test_hash")
+    
+    # Assert
+    assert found_file is None
+
+
+class TestFileDocumentRepositoryNameMatching:
+  """Tests for file document name matching functionality."""
+  
+  def test_i_can_find_documents_by_name_with_fuzzy_matching(self, in_memory_repository, multiple_sample_files):
+    """Test finding file documents by filename using fuzzy matching."""
+    # Arrange
+    for file_doc in multiple_sample_files:
+      in_memory_repository.create_document(file_doc)
+    
+    # Act
+    fuzzy_method = FuzzyMatching(threshold=0.5)
+    found_files = in_memory_repository.find_document_by_name("document", fuzzy_method)
+    
+    # Assert
+    assert len(found_files) >= 1
+    assert all(isinstance(file_doc, FileDocument) for file_doc in found_files)
+    # Should find files with "document" in the name
+    found_filenames = [f.filename for f in found_files]
+    assert any("document" in fname.lower() for fname in found_filenames)
+  
+  def test_i_can_find_documents_by_name_with_subsequence_matching(self, in_memory_repository,
+                                                                  multiple_sample_files):
+    """Test finding file documents by filename using subsequence matching."""
+    # Arrange
+    for file_doc in multiple_sample_files:
+      in_memory_repository.create_document(file_doc)
+    
+    # Act
+    subsequence_method = SubsequenceMatching()
+    found_files = in_memory_repository.find_document_by_name("doc", subsequence_method)
+    
+    # Assert
+    assert len(found_files) >= 1
+    assert all(isinstance(file_doc, FileDocument) for file_doc in found_files)
+  
+  def test_i_can_find_documents_by_name_with_default_method(self, in_memory_repository, multiple_sample_files):
+    """Test finding file documents by filename with default matching method."""
+    # Arrange
+    for file_doc in multiple_sample_files:
+      in_memory_repository.create_document(file_doc)
+    
+    # Act
+    found_files = in_memory_repository.find_document_by_name("first")
+    
+    # Assert
+    assert len(found_files) >= 0
+    assert all(isinstance(file_doc, FileDocument) for file_doc in found_files)
+  
+  def test_i_cannot_find_documents_by_name_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during document name matching."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find', side_effect=PyMongoError("Database error"))
+    
+    # Act
+    found_files = in_memory_repository.find_document_by_name("test")
+    
+    # Assert
+    assert found_files == []
+
+
+class TestFileDocumentRepositoryListing:
+  """Tests for file document listing functionality."""
+  
+  def test_i_can_list_documents_with_default_pagination(self, in_memory_repository, multiple_sample_files):
+    """Test listing file documents with default pagination."""
+    # Arrange
+    for file_doc in multiple_sample_files:
+      in_memory_repository.create_document(file_doc)
+    
+    # Act
+    files = in_memory_repository.list_documents()
+    
+    # Assert
+    assert len(files) == len(multiple_sample_files)
+    assert all(isinstance(file_doc, FileDocument) for file_doc in files)
+  
+  def test_i_can_list_documents_with_custom_pagination(self, in_memory_repository, multiple_sample_files):
+    """Test listing file documents with custom pagination."""
+    # Arrange
+    for file_doc in multiple_sample_files:
+      in_memory_repository.create_document(file_doc)
+    
+    # Act
+    files_page1 = in_memory_repository.list_documents(skip=0, limit=2)
+    files_page2 = in_memory_repository.list_documents(skip=2, limit=2)
+    
+    # Assert
+    assert len(files_page1) == 2
+    assert len(files_page2) == 1  # Only 3 total files
+    
+    # Ensure no overlap between pages
+    page1_ids = [file_doc.id for file_doc in files_page1]
+    page2_ids = [file_doc.id for file_doc in files_page2]
+    assert len(set(page1_ids).intersection(set(page2_ids))) == 0
+  
+  def test_i_can_list_documents_sorted_by_detected_at(self, in_memory_repository, sample_file_document):
+    """Test that file documents are sorted by detected_at in descending order."""
+    # Arrange
+    file1 = sample_file_document.model_copy()
+    file1.filepath = "/docs/file1.pdf"
+    file1.filename = "file1.pdf"
+    file1.file_hash = "hash1" + "0" * 58
+    file1.detected_at = datetime(2024, 1, 1, 10, 0, 0)
+    
+    file2 = sample_file_document.model_copy()
+    file2.filepath = "/docs/file2.pdf"
+    file2.filename = "file2.pdf"
+    file2.file_hash = "hash2" + "0" * 58
+    file2.detected_at = datetime(2024, 1, 2, 10, 0, 0)  # Later date
+    
+    created_file1 = in_memory_repository.create_document(file1)
+    created_file2 = in_memory_repository.create_document(file2)
+    
+    # Act
+    files = in_memory_repository.list_documents()
+    
+    # Assert
+    assert len(files) == 2
+    # Most recent (latest detected_at) should be first
+    assert files[0].id == created_file2.id
+    assert files[1].id == created_file1.id
+  
+  def test_i_can_list_empty_documents(self, in_memory_repository):
+    """Test listing file documents from empty collection."""
+    # Act
+    files = in_memory_repository.list_documents()
+    
+    # Assert
+    assert files == []
+  
+  def test_i_cannot_list_documents_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during file document listing."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find', side_effect=PyMongoError("Database error"))
+    
+    # Act
+    files = in_memory_repository.list_documents()
+    
+    # Assert
+    assert files == []
+
+
+class TestFileDocumentRepositoryUpdate:
+  """Tests for file document update functionality."""
+  
+  def test_i_can_update_document_successfully(self, in_memory_repository, sample_file_document,
+                                              sample_update_data):
+    """Test successful file document update."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    updated_file = in_memory_repository.update_document(str(created_file.id), sample_update_data)
+    
+    # Assert
+    assert updated_file is not None
+    assert updated_file.extraction_method == sample_update_data["extraction_method"]
+    assert updated_file.metadata == sample_update_data["metadata"]
+    assert updated_file.file_size == sample_update_data["file_size"]
+    assert updated_file.id == created_file.id
+    assert updated_file.filename == created_file.filename  # Unchanged fields remain
+    assert updated_file.filepath == created_file.filepath
+  
+  def test_i_can_update_document_with_partial_data(self, in_memory_repository, sample_file_document):
+    """Test updating file document with partial data."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    partial_update = {"file_size": 999999}
+    
+    # Act
+    updated_file = in_memory_repository.update_document(str(created_file.id), partial_update)
+    
+    # Assert
+    assert updated_file is not None
+    assert updated_file.file_size == 999999
+    assert updated_file.filename == created_file.filename  # Should remain unchanged
+    assert updated_file.metadata == created_file.metadata  # Should remain unchanged
+  
+  def test_i_can_update_document_filtering_none_values(self, in_memory_repository, sample_file_document):
+    """Test that None values are filtered out from update data."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    update_with_none = {"file_size": 777777, "metadata": None}
+    
+    # Act
+    updated_file = in_memory_repository.update_document(str(created_file.id), update_with_none)
+    
+    # Assert
+    assert updated_file is not None
+    assert updated_file.file_size == 777777
+    assert updated_file.metadata == created_file.metadata  # Should remain unchanged (None filtered out)
+  
+  def test_i_can_update_document_with_empty_data(self, in_memory_repository, sample_file_document):
+    """Test updating file document with empty data returns current document."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    empty_update = {}
+    
+    # Act
+    result = in_memory_repository.update_document(str(created_file.id), empty_update)
+    
+    # Assert
+    assert result is not None
+    assert result.filename == created_file.filename
+    assert result.filepath == created_file.filepath
+    assert result.metadata == created_file.metadata
+  
+  def test_i_cannot_update_document_with_invalid_id(self, in_memory_repository, sample_update_data):
+    """Test that updating with invalid ID returns None."""
+    # Act
+    result = in_memory_repository.update_document("invalid_id", sample_update_data)
+    
+    # Assert
+    assert result is None
+  
+  def test_i_cannot_update_nonexistent_document(self, in_memory_repository, sample_update_data):
+    """Test that updating nonexistent file document returns None."""
+    # Arrange
+    nonexistent_id = str(ObjectId())
+    
+    # Act
+    result = in_memory_repository.update_document(nonexistent_id, sample_update_data)
+    
+    # Assert
+    assert result is None
+  
+  def test_i_cannot_update_document_with_pymongo_error(self, in_memory_repository, sample_file_document,
+                                                       sample_update_data, mocker):
+    """Test handling of PyMongo errors during file document update."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    mocker.patch.object(in_memory_repository.collection, 'find_one_and_update',
+                        side_effect=PyMongoError("Database error"))
+    
+    # Act
+    result = in_memory_repository.update_document(str(created_file.id), sample_update_data)
+    
+    # Assert
+    assert result is None
+
+
+class TestFileDocumentRepositoryDeletion:
+  """Tests for file document deletion functionality."""
+  
+  def test_i_can_delete_existing_document(self, in_memory_repository, sample_file_document):
+    """Test successful file document deletion."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    deletion_result = in_memory_repository.delete_document(str(created_file.id))
+    
+    # Assert
+    assert deletion_result is True
+    
+    # Verify document is actually deleted
+    found_file = in_memory_repository.find_document_by_id(str(created_file.id))
+    assert found_file is None
+  
+  def test_i_cannot_delete_document_with_invalid_id(self, in_memory_repository):
+    """Test that deleting with invalid ID returns False."""
+    # Act
+    result = in_memory_repository.delete_document("invalid_id")
+    
+    # Assert
+    assert result is False
+  
+  def test_i_cannot_delete_nonexistent_document(self, in_memory_repository):
+    """Test that deleting nonexistent file document returns False."""
+    # Arrange
+    nonexistent_id = str(ObjectId())
+    
+    # Act
+    result = in_memory_repository.delete_document(nonexistent_id)
+    
+    # Assert
+    assert result is False
+  
+  def test_i_cannot_delete_document_with_pymongo_error(self, in_memory_repository, sample_file_document, mocker):
+    """Test handling of PyMongo errors during file document deletion."""
+    # Arrange
+    created_file = in_memory_repository.create_document(sample_file_document)
+    mocker.patch.object(in_memory_repository.collection, 'delete_one', side_effect=PyMongoError("Database error"))
+    
+    # Act
+    result = in_memory_repository.delete_document(str(created_file.id))
+    
+    # Assert
+    assert result is False
+
+
+class TestFileDocumentRepositoryUtilities:
+  """Tests for utility methods."""
+  
+  def test_i_can_count_documents(self, in_memory_repository, sample_file_document):
+    """Test counting file documents."""
+    # Arrange
+    initial_count = in_memory_repository.count_documents()
+    in_memory_repository.create_document(sample_file_document)
+    
+    # Act
+    final_count = in_memory_repository.count_documents()
+    
+    # Assert
+    assert final_count == initial_count + 1
+  
+  def test_i_can_count_zero_documents(self, in_memory_repository):
+    """Test counting file documents in empty collection."""
+    # Act
+    count = in_memory_repository.count_documents()
+    
+    # Assert
+    assert count == 0
+  
+  def test_i_cannot_count_documents_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during file document counting."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'count_documents', side_effect=PyMongoError("Database error"))
+    
+    # Act
+    count = in_memory_repository.count_documents()
+    
+    # Assert
+    assert count == 0
+
+
+class TestMatchingMethods:
+  """Tests for matching method classes."""
+  
+  def test_i_can_create_fuzzy_matching_with_default_threshold(self):
+    """Test creating FuzzyMatching with default threshold."""
+    # Act
+    fuzzy = FuzzyMatching()
+    
+    # Assert
+    assert fuzzy.threshold == 0.6
+  
+  def test_i_can_create_fuzzy_matching_with_custom_threshold(self):
+    """Test creating FuzzyMatching with custom threshold."""
+    # Act
+    fuzzy = FuzzyMatching(threshold=0.8)
+    
+    # Assert
+    assert fuzzy.threshold == 0.8
+  
+  def test_i_can_create_subsequence_matching(self):
+    """Test creating SubsequenceMatching."""
+    # Act
+    subsequence = SubsequenceMatching()
+    
+    # Assert
+    assert isinstance(subsequence, MatchMethodBase)
+    assert isinstance(subsequence, SubsequenceMatching)

tests/repositories/test_job_repository.py

@@ -0,0 +1,496 @@
+"""
+Test suite for JobRepository with async/support.
+
+This module contains comprehensive tests for all JobRepository methods
+using mongomock-motor for in-memory MongoDB testing.
+"""
+
+from datetime import datetime
+
+import pytest
+from bson import ObjectId
+from mongomock.mongo_client import MongoClient
+from mongomock_motor import AsyncMongoMockClient
+from pymongo.errors import PyMongoError
+
+from app.database.repositories.job_repository import JobRepository
+from app.exceptions.job_exceptions import JobRepositoryError
+from app.models.job import ProcessingJob, ProcessingStatus
+from app.models.types import PyObjectId
+
+
+@pytest.fixture
+def in_memory_repository():
+  """Create an in-memory JobRepository for testing."""
+  client = MongoClient()
+  db = client.test_database
+  repo = JobRepository(db)
+  repo.initialize()
+  return repo
+
+
+@pytest.fixture
+def sample_document_id():
+  """Sample document ObjectId for testing."""
+  return PyObjectId()
+
+
+@pytest.fixture
+def sample_task_id():
+  """Sample Celery task ID for testing."""
+  return "celery-task-12345-abcde"
+
+
+@pytest.fixture
+def multiple_sample_jobs():
+  """Multiple ProcessingJob objects for testing."""
+  doc_id_1 = ObjectId()
+  doc_id_2 = ObjectId()
+  base_time = datetime.utcnow()
+  
+  return [
+      ProcessingJob(
+        document_id=doc_id_1,
+        status=ProcessingStatus.PENDING,
+        task_id="task-1",
+        created_at=base_time,
+        started_at=None,
+        completed_at=None,
+        error_message=None
+      ),
+      ProcessingJob(
+        document_id=doc_id_2,
+        status=ProcessingStatus.PROCESSING,
+        task_id="task-2",
+        created_at=base_time,
+        started_at=base_time,
+        completed_at=None,
+        error_message=None
+      ),
+      ProcessingJob(
+        document_id=doc_id_1,
+        status=ProcessingStatus.COMPLETED,
+        task_id="task-3",
+        created_at=base_time,
+        started_at=base_time,
+        completed_at=base_time,
+        error_message=None
+      )
+  ]
+
+
+class TestJobRepositoryInitialization:
+  """Tests for repository initialization."""
+  
+  def test_i_can_initialize_repository(self):
+    """Test repository initialization."""
+    # Arrange
+    client = AsyncMongoMockClient()
+    db = client.test_database
+    repo = JobRepository(db)
+    
+    # Act
+    initialized_repo = repo.initialize()
+    
+    # Assert
+    assert initialized_repo is repo
+    assert repo.db is not None
+    assert repo.collection is not None
+
+
+class TestJobRepositoryCreation:
+  """Tests for job creation functionality."""
+  
+  def test_i_can_create_job_with_task_id(self, in_memory_repository, sample_document_id, sample_task_id):
+    """Test successful job creation with task ID."""
+    # Act
+    created_job = in_memory_repository.create_job(sample_document_id, sample_task_id)
+    
+    # Assert
+    assert created_job is not None
+    assert created_job.document_id == sample_document_id
+    assert created_job.task_id == sample_task_id
+    assert created_job.status == ProcessingStatus.PENDING
+    assert created_job.created_at is not None
+    assert created_job.started_at is None
+    assert created_job.completed_at is None
+    assert created_job.error_message is None
+    assert created_job.id is not None
+    assert isinstance(created_job.id, ObjectId)
+  
+  def test_i_can_create_job_without_task_id(self, in_memory_repository, sample_document_id):
+    """Test successful job creation without task ID."""
+    # Act
+    created_job = in_memory_repository.create_job(sample_document_id)
+    
+    # Assert
+    assert created_job is not None
+    assert created_job.document_id == sample_document_id
+    assert created_job.task_id is None
+    assert created_job.status == ProcessingStatus.PENDING
+    assert created_job.created_at is not None
+    assert created_job.started_at is None
+    assert created_job.completed_at is None
+    assert created_job.error_message is None
+    assert created_job.id is not None
+    assert isinstance(created_job.id, ObjectId)
+  
+  def test_i_cannot_create_duplicate_job_for_document(self, in_memory_repository, sample_document_id,
+                                                      sample_task_id):
+    """Test that creating job with duplicate document_id raises DuplicateKeyError."""
+    # Arrange
+    in_memory_repository.create_job(sample_document_id, sample_task_id)
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.create_job(sample_document_id, "different-task-id")
+    
+    assert "create_job" in str(exc_info.value)
+  
+  def test_i_cannot_create_job_with_pymongo_error(self, in_memory_repository, sample_document_id, mocker):
+    """Test handling of PyMongo errors during job creation."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'insert_one', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.create_job(sample_document_id)
+    
+    assert "create_job" in str(exc_info.value)
+
+
+class TestJobRepositoryFinding:
+  """Tests for job finding functionality."""
+  
+  def test_i_can_find_job_by_valid_id(self, in_memory_repository, sample_document_id, sample_task_id):
+    """Test finding job by valid ObjectId."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id, sample_task_id)
+    
+    # Act
+    found_job = in_memory_repository.find_job_by_id(created_job.id)
+    
+    # Assert
+    assert found_job is not None
+    assert found_job.id == created_job.id
+    assert found_job.document_id == created_job.document_id
+    assert found_job.task_id == created_job.task_id
+    assert found_job.status == created_job.status
+  
+  def test_i_cannot_find_job_by_nonexistent_id(self, in_memory_repository):
+    """Test that nonexistent ObjectId returns None."""
+    # Arrange
+    nonexistent_id = PyObjectId()
+    
+    # Act
+    found_job = in_memory_repository.find_job_by_id(nonexistent_id)
+    
+    # Assert
+    assert found_job is None
+  
+  def test_i_cannot_find_job_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during job finding."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find_one', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.find_job_by_id(PyObjectId())
+    
+    assert "get_job_by_id" in str(exc_info.value)
+  
+  def test_i_can_find_jobs_by_document_id(self, in_memory_repository, sample_document_id, sample_task_id):
+    """Test finding jobs by document ID."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id, sample_task_id)
+    
+    # Act
+    found_jobs = in_memory_repository.find_jobs_by_document_id(sample_document_id)
+    
+    # Assert
+    assert len(found_jobs) == 1
+    assert found_jobs[0].id == created_job.id
+    assert found_jobs[0].document_id == sample_document_id
+  
+  def test_i_can_find_empty_jobs_list_for_nonexistent_document(self, in_memory_repository):
+    """Test that nonexistent document ID returns empty list."""
+    # Arrange
+    nonexistent_id = ObjectId()
+    
+    # Act
+    found_jobs = in_memory_repository.find_jobs_by_document_id(nonexistent_id)
+    
+    # Assert
+    assert found_jobs == []
+  
+  def test_i_cannot_find_jobs_by_document_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during finding jobs by document ID."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.find_jobs_by_document_id(PyObjectId())
+    
+    assert "get_jobs_by_file_id" in str(exc_info.value)
+  
+  @pytest.mark.parametrize("status", [
+      ProcessingStatus.PENDING,
+      ProcessingStatus.PROCESSING,
+      ProcessingStatus.COMPLETED
+  ])
+  def test_i_can_find_jobs_by_pending_status(self, in_memory_repository, sample_document_id, status):
+    """Test finding jobs by PENDING status."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    in_memory_repository.update_job_status(created_job.id, status)
+    
+    # Act
+    found_jobs = in_memory_repository.get_jobs_by_status(status)
+    
+    # Assert
+    assert len(found_jobs) == 1
+    assert found_jobs[0].id == created_job.id
+    assert found_jobs[0].status == status
+  
+  def test_i_can_find_jobs_by_failed_status(self, in_memory_repository, sample_document_id):
+    """Test finding jobs by FAILED status."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    in_memory_repository.update_job_status(created_job.id, ProcessingStatus.FAILED, "Test error")
+    
+    # Act
+    found_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.FAILED)
+    
+    # Assert
+    assert len(found_jobs) == 1
+    assert found_jobs[0].id == created_job.id
+    assert found_jobs[0].status == ProcessingStatus.FAILED
+    assert found_jobs[0].error_message == "Test error"
+  
+  def test_i_can_find_empty_jobs_list_for_unused_status(self, in_memory_repository):
+    """Test that unused status returns empty list."""
+    # Act
+    found_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.COMPLETED)
+    
+    # Assert
+    assert found_jobs == []
+  
+  def test_i_cannot_find_jobs_by_status_with_pymongo_error(self, in_memory_repository, mocker):
+    """Test handling of PyMongo errors during finding jobs by status."""
+    # Arrange
+    mocker.patch.object(in_memory_repository.collection, 'find', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.get_jobs_by_status(ProcessingStatus.PENDING)
+    
+    assert "get_jobs_by_status" in str(exc_info.value)
+
+
+class TestJobRepositoryStatusUpdate:
+  """Tests for job status update functionality."""
+  
+  def test_i_can_update_job_status_to_processing(self, in_memory_repository, sample_document_id):
+    """Test updating job status to PROCESSING with started_at timestamp."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    
+    # Act
+    updated_job = in_memory_repository.update_job_status(created_job.id, ProcessingStatus.PROCESSING)
+    
+    # Assert
+    assert updated_job is not None
+    assert updated_job.id == created_job.id
+    assert updated_job.status == ProcessingStatus.PROCESSING
+    assert updated_job.started_at is not None
+    assert updated_job.completed_at is None
+    assert updated_job.error_message is None
+  
+  def test_i_can_update_job_status_to_completed(self, in_memory_repository, sample_document_id):
+    """Test updating job status to COMPLETED with completed_at timestamp."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    in_memory_repository.update_job_status(created_job.id, ProcessingStatus.PROCESSING)
+    
+    # Act
+    updated_job = in_memory_repository.update_job_status(created_job.id, ProcessingStatus.COMPLETED)
+    
+    # Assert
+    assert updated_job is not None
+    assert updated_job.id == created_job.id
+    assert updated_job.status == ProcessingStatus.COMPLETED
+    assert updated_job.started_at is not None
+    assert updated_job.completed_at is not None
+    assert updated_job.error_message is None
+  
+  def test_i_can_update_job_status_to_failed_with_error(self, in_memory_repository, sample_document_id):
+    """Test updating job status to FAILED with error message and completed_at timestamp."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    error_message = "Processing failed due to invalid format"
+    
+    # Act
+    updated_job = in_memory_repository.update_job_status(
+      created_job.id, ProcessingStatus.FAILED, error_message
+    )
+    
+    # Assert
+    assert updated_job is not None
+    assert updated_job.id == created_job.id
+    assert updated_job.status == ProcessingStatus.FAILED
+    assert updated_job.completed_at is not None
+    assert updated_job.error_message == error_message
+  
+  def test_i_can_update_job_status_to_failed_without_error(self, in_memory_repository, sample_document_id):
+    """Test updating job status to FAILED without error message."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    
+    # Act
+    updated_job = in_memory_repository.update_job_status(created_job.id, ProcessingStatus.FAILED)
+    
+    # Assert
+    assert updated_job is not None
+    assert updated_job.id == created_job.id
+    assert updated_job.status == ProcessingStatus.FAILED
+    assert updated_job.completed_at is not None
+    assert updated_job.error_message is None
+  
+  def test_i_cannot_update_nonexistent_job_status(self, in_memory_repository):
+    """Test that updating nonexistent job returns None."""
+    # Arrange
+    nonexistent_id = ObjectId()
+    
+    # Act
+    result = in_memory_repository.update_job_status(nonexistent_id, ProcessingStatus.COMPLETED)
+    
+    # Assert
+    assert result is None
+  
+  def test_i_cannot_update_job_status_with_pymongo_error(self, in_memory_repository, sample_document_id, mocker):
+    """Test handling of PyMongo errors during job status update."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    mocker.patch.object(in_memory_repository.collection, 'find_one_and_update',
+                        side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.update_job_status(created_job.id, ProcessingStatus.COMPLETED)
+    
+    assert "update_job_status" in str(exc_info.value)
+
+
+class TestJobRepositoryDeletion:
+  """Tests for job deletion functionality."""
+  
+  def test_i_can_delete_existing_job(self, in_memory_repository, sample_document_id):
+    """Test successful job deletion."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    
+    # Act
+    deletion_result = in_memory_repository.delete_job(created_job.id)
+    
+    # Assert
+    assert deletion_result is True
+    
+    # Verify job is actually deleted
+    found_job = in_memory_repository.find_job_by_id(created_job.id)
+    assert found_job is None
+  
+  def test_i_cannot_delete_nonexistent_job(self, in_memory_repository):
+    """Test that deleting nonexistent job returns False."""
+    # Arrange
+    nonexistent_id = ObjectId()
+    
+    # Act
+    result = in_memory_repository.delete_job(nonexistent_id)
+    
+    # Assert
+    assert result is False
+  
+  def test_i_cannot_delete_job_with_pymongo_error(self, in_memory_repository, sample_document_id, mocker):
+    """Test handling of PyMongo errors during job deletion."""
+    # Arrange
+    created_job = in_memory_repository.create_job(sample_document_id)
+    mocker.patch.object(in_memory_repository.collection, 'delete_one', side_effect=PyMongoError("Database error"))
+    
+    # Act & Assert
+    with pytest.raises(JobRepositoryError) as exc_info:
+      in_memory_repository.delete_job(created_job.id)
+    
+    assert "delete_job" in str(exc_info.value)
+
+
+class TestJobRepositoryComplexScenarios:
+  """Tests for complex job repository scenarios."""
+  
+  def test_i_can_handle_complete_job_lifecycle(self, in_memory_repository, sample_document_id, sample_task_id):
+    """Test complete job lifecycle from creation to completion."""
+    # Create job
+    job = in_memory_repository.create_job(sample_document_id, sample_task_id)
+    assert job.status == ProcessingStatus.PENDING
+    assert job.started_at is None
+    assert job.completed_at is None
+    
+    # Start processing
+    job = in_memory_repository.update_job_status(job.id, ProcessingStatus.PROCESSING)
+    assert job.status == ProcessingStatus.PROCESSING
+    assert job.started_at is not None
+    assert job.completed_at is None
+    
+    # Complete job
+    job = in_memory_repository.update_job_status(job.id, ProcessingStatus.COMPLETED)
+    assert job.status == ProcessingStatus.COMPLETED
+    assert job.started_at is not None
+    assert job.completed_at is not None
+    assert job.error_message is None
+  
+  def test_i_can_handle_job_failure_scenario(self, in_memory_repository, sample_document_id, sample_task_id):
+    """Test job failure scenario with error message."""
+    # Create and start job
+    job = in_memory_repository.create_job(sample_document_id, sample_task_id)
+    job = in_memory_repository.update_job_status(job.id, ProcessingStatus.PROCESSING)
+    
+    # Fail job with error
+    error_msg = "File format not supported"
+    job = in_memory_repository.update_job_status(job.id, ProcessingStatus.FAILED, error_msg)
+    
+    # Assert failure state
+    assert job.status == ProcessingStatus.FAILED
+    assert job.started_at is not None
+    assert job.completed_at is not None
+    assert job.error_message == error_msg
+  
+  def test_i_can_handle_multiple_documents_with_different_statuses(self, in_memory_repository):
+    """Test managing multiple jobs for different documents with various statuses."""
+    # Create jobs for different documents
+    doc1 = PyObjectId()
+    doc2 = PyObjectId()
+    doc3 = PyObjectId()
+    
+    job1 = in_memory_repository.create_job(doc1, "task-1")
+    job2 = in_memory_repository.create_job(doc2, "task-2")
+    job3 = in_memory_repository.create_job(doc3, "task-3")
+    
+    # Update to different statuses
+    in_memory_repository.update_job_status(job1.id, ProcessingStatus.PROCESSING)
+    in_memory_repository.update_job_status(job2.id, ProcessingStatus.COMPLETED)
+    in_memory_repository.update_job_status(job3.id, ProcessingStatus.FAILED, "Error occurred")
+    
+    # Verify status queries
+    pending_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.PENDING)
+    processing_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.PROCESSING)
+    completed_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.COMPLETED)
+    failed_jobs = in_memory_repository.get_jobs_by_status(ProcessingStatus.FAILED)
+    
+    assert len(pending_jobs) == 0
+    assert len(processing_jobs) == 1
+    assert len(completed_jobs) == 1
+    assert len(failed_jobs) == 1
+    
+    assert processing_jobs[0].id == job1.id
+    assert completed_jobs[0].id == job2.id
+    assert failed_jobs[0].id == job3.id

tests/repositories/test_user_repository.py

@@ -0,0 +1,279 @@
+"""
+Test suite for UserRepository with async/support.
+
+This module contains comprehensive tests for all UserRepository methods
+using mongomock-motor for in-memory MongoDB testing.
+"""
+
+import pytest
+from bson import ObjectId
+from mongomock.mongo_client import MongoClient
+from pymongo.errors import DuplicateKeyError
+
+from app.database.repositories.user_repository import UserRepository
+from app.models.user import UserCreate, UserUpdate
+
+
+@pytest.fixture
+def in_memory_repository():
+  """Create an in-memory UserRepository for testing."""
+  client = MongoClient()
+  db = client.test_database
+  repo = UserRepository(db)
+  repo.initialize()
+  return repo
+
+
+@pytest.fixture
+def sample_user_create():
+  """Sample UserCreate data for testing."""
+  return UserCreate(
+    username="testuser",
+    email="test@example.com",
+    password="#TestPassword123",
+    role="user"
+  )
+
+
+@pytest.fixture
+def sample_user_update():
+  """Sample UserUpdate data for testing."""
+  return UserUpdate(
+    username="updateduser",
+    email="updated@example.com",
+    role="admin"
+  )
+
+
+class TestUserRepositoryCreation:
+  """Tests for user creation functionality."""
+  
+  def test_i_can_create_user(self, in_memory_repository, sample_user_create):
+    """Test successful user creation."""
+    # Act
+    created_user = in_memory_repository.create_user(sample_user_create)
+    
+    # Assert
+    assert created_user is not None
+    assert created_user.username == sample_user_create.username
+    assert created_user.email == sample_user_create.email
+    assert created_user.role == sample_user_create.role
+    assert created_user.is_active is True
+    assert created_user.id is not None
+    assert created_user.created_at is not None
+    assert created_user.updated_at is not None
+    assert created_user.hashed_password != sample_user_create.password  # Should be hashed
+  
+  def test_i_cannot_create_user_with_duplicate_username(self, in_memory_repository, sample_user_create):
+    """Test that creating user with duplicate username raises DuplicateKeyError."""
+    # Arrange
+    in_memory_repository.create_user(sample_user_create)
+    
+    # Act & Assert
+    with pytest.raises(DuplicateKeyError) as exc_info:
+      in_memory_repository.create_user(sample_user_create)
+    
+    assert "already exists" in str(exc_info.value)
+
+
+class TestUserRepositoryFinding:
+  """Tests for user finding functionality."""
+  
+  def test_i_can_find_user_by_id(self, in_memory_repository, sample_user_create):
+    """Test finding user by valid ID."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    found_user = in_memory_repository.find_user_by_id(str(created_user.id))
+    
+    # Assert
+    assert found_user is not None
+    assert found_user.id == created_user.id
+    assert found_user.username == created_user.username
+    assert found_user.email == created_user.email
+  
+  def test_i_cannot_find_user_by_invalid_id(self, in_memory_repository):
+    """Test that invalid ObjectId returns None."""
+    # Act
+    found_user = in_memory_repository.find_user_by_id("invalid_id")
+    
+    # Assert
+    assert found_user is None
+  
+  def test_i_cannot_find_user_by_nonexistent_id(self, in_memory_repository):
+    """Test that nonexistent but valid ObjectId returns None."""
+    # Arrange
+    nonexistent_id = str(ObjectId())
+    
+    # Act
+    found_user = in_memory_repository.find_user_by_id(nonexistent_id)
+    
+    # Assert
+    assert found_user is None
+  
+  def test_i_can_find_user_by_username(self, in_memory_repository, sample_user_create):
+    """Test finding user by username."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    found_user = in_memory_repository.find_user_by_username(sample_user_create.username)
+    
+    # Assert
+    assert found_user is not None
+    assert found_user.username == created_user.username
+    assert found_user.id == created_user.id
+  
+  def test_i_cannot_find_user_by_nonexistent_username(self, in_memory_repository):
+    """Test that nonexistent username returns None."""
+    # Act
+    found_user = in_memory_repository.find_user_by_username("nonexistent")
+    
+    # Assert
+    assert found_user is None
+  
+  def test_i_can_find_user_by_email(self, in_memory_repository, sample_user_create):
+    """Test finding user by email."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    found_user = in_memory_repository.find_user_by_email(str(sample_user_create.email))
+    
+    # Assert
+    assert found_user is not None
+    assert found_user.email == created_user.email
+    assert found_user.id == created_user.id
+  
+  def test_i_cannot_find_user_by_nonexistent_email(self, in_memory_repository):
+    """Test that nonexistent email returns None."""
+    # Act
+    found_user = in_memory_repository.find_user_by_email("nonexistent@example.com")
+    
+    # Assert
+    assert found_user is None
+
+
+class TestUserRepositoryUpdate:
+  """Tests for user update functionality."""
+  
+  def test_i_can_update_user(self, in_memory_repository, sample_user_create, sample_user_update):
+    """Test successful user update."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    original_updated_at = created_user.updated_at
+    
+    # Act
+    updated_user = in_memory_repository.update_user(str(created_user.id), sample_user_update)
+    
+    # Assert
+    assert updated_user is not None
+    assert updated_user.username == sample_user_update.username
+    assert updated_user.email == sample_user_update.email
+    assert updated_user.role == sample_user_update.role
+    assert updated_user.id == created_user.id
+  
+  def test_i_cannot_update_user_with_invalid_id(self, in_memory_repository, sample_user_update):
+    """Test that updating with invalid ID returns None."""
+    # Act
+    result = in_memory_repository.update_user("invalid_id", sample_user_update)
+    
+    # Assert
+    assert result is None
+  
+  def test_i_can_update_user_with_partial_data(self, in_memory_repository, sample_user_create):
+    """Test updating user with partial data."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    partial_update = UserUpdate(username="newusername")
+    
+    # Act
+    updated_user = in_memory_repository.update_user(str(created_user.id), partial_update)
+    
+    # Assert
+    assert updated_user is not None
+    assert updated_user.username == "newusername"
+    assert updated_user.email == created_user.email  # Should remain unchanged
+    assert updated_user.role == created_user.role  # Should remain unchanged
+  
+  def test_i_can_update_user_with_empty_data(self, in_memory_repository, sample_user_create):
+    """Test updating user with empty data returns current user."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    empty_update = UserUpdate()
+    
+    # Act
+    result = in_memory_repository.update_user(str(created_user.id), empty_update)
+    
+    # Assert
+    assert result is not None
+    assert result.username == created_user.username
+    assert result.email == created_user.email
+
+
+class TestUserRepositoryDeletion:
+  """Tests for user deletion functionality."""
+  
+  def test_i_can_delete_user(self, in_memory_repository, sample_user_create):
+    """Test successful user deletion."""
+    # Arrange
+    created_user = in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    deletion_result = in_memory_repository.delete_user(str(created_user.id))
+    
+    # Assert
+    assert deletion_result is True
+    
+    # Verify user is actually deleted
+    found_user = in_memory_repository.find_user_by_id(str(created_user.id))
+    assert found_user is None
+  
+  def test_i_cannot_delete_user_with_invalid_id(self, in_memory_repository):
+    """Test that deleting with invalid ID returns False."""
+    # Act
+    result = in_memory_repository.delete_user("invalid_id")
+    
+    # Assert
+    assert result is False
+  
+  def test_i_cannot_delete_nonexistent_user(self, in_memory_repository):
+    """Test that deleting nonexistent user returns False."""
+    # Arrange
+    nonexistent_id = str(ObjectId())
+    
+    # Act
+    result = in_memory_repository.delete_user(nonexistent_id)
+    
+    # Assert
+    assert result is False
+
+
+class TestUserRepositoryUtilities:
+  """Tests for utility methods."""
+  
+  def test_i_can_count_users(self, in_memory_repository, sample_user_create):
+    """Test counting users."""
+    # Arrange
+    initial_count = in_memory_repository.count_users()
+    in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    final_count = in_memory_repository.count_users()
+    
+    # Assert
+    assert final_count == initial_count + 1
+  
+  def test_i_can_check_user_exists(self, in_memory_repository, sample_user_create):
+    """Test checking if user exists."""
+    # Arrange
+    in_memory_repository.create_user(sample_user_create)
+    
+    # Act
+    exists = in_memory_repository.user_exists(sample_user_create.username)
+    not_exists = in_memory_repository.user_exists("nonexistent")
+    
+    # Assert
+    assert exists is True
+    assert not_exists is False

tests/services/test_document_service.py

@@ -0,0 +1,704 @@
+"""
+Unit tests for DocumentService using in-memory MongoDB.
+
+Tests the orchestration logic with real MongoDB operations
+using mongomock for better integration testing.
+"""
+import os
+from datetime import datetime
+from unittest.mock import patch
+
+import pytest
+import pytest_asyncio
+from bson import ObjectId
+from mongomock.mongo_client import MongoClient
+
+from app.models.document import FileType
+from app.services.document_service import DocumentService
+
+
+@pytest.fixture(autouse=True)
+def cleanup_test_folder():
+  """Clean up test folder."""
+  import shutil
+  shutil.rmtree("test_folder", ignore_errors=True)
+
+
+@pytest.fixture
+def in_memory_database():
+  """Create an in-memory database for testing."""
+  client = MongoClient()
+  return client.test_database
+
+
+@pytest_asyncio.fixture
+def document_service(in_memory_database):
+  """Create DocumentService with in-memory repositories."""
+  service = DocumentService(in_memory_database, objects_folder="test_folder")
+  return service
+
+
+@pytest.fixture
+def sample_file_bytes():
+  """Sample file content as bytes."""
+  return b"This is a test PDF content"
+
+
+@pytest.fixture
+def sample_text_bytes():
+  """Sample text file content as bytes."""
+  return b"This is a test text file content"
+
+
+@pytest.fixture
+def sample_file_hash():
+  """Expected SHA256 hash for sample file bytes."""
+  import hashlib
+  return hashlib.sha256(b"This is a test PDF content").hexdigest()
+
+
+def validate_file_saved(document_service, file_hash, file_bytes):
+  # Verify file is saved to disk
+  target_file_path = os.path.join(document_service.objects_folder, file_hash[:24], file_hash)
+  assert os.path.exists(target_file_path)
+  
+  with open(target_file_path, "rb") as f:
+    content = f.read()
+  assert content == file_bytes
+
+
+class TestCreateDocument:
+  """Tests for create_document method."""
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  @patch('app.services.document_service.datetime')
+  def test_i_can_create_document_with_new_content(
+      self,
+      mock_datetime,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test creating document when content doesn't exist yet."""
+    # Setup mocks
+    fixed_time = datetime(2025, 1, 1, 10, 30, 0)
+    mock_datetime.now.return_value = fixed_time
+    mock_magic.return_value = "application/pdf"
+    
+    # Execute
+    result = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Verify document creation
+    assert result is not None
+    assert result.filename == "test.pdf"
+    assert result.filepath == "/test/test.pdf"
+    assert result.file_type == FileType.PDF
+    assert result.detected_at == fixed_time
+    assert result.file_hash == document_service._calculate_file_hash(sample_file_bytes)
+    
+    # Verify document created in database
+    doc_in_db = document_service.document_repository.find_document_by_id(result.id)
+    assert doc_in_db is not None
+    assert doc_in_db.id == result.id
+    assert doc_in_db.filename == result.filename
+    assert doc_in_db.filepath == result.filepath
+    assert doc_in_db.file_type == result.file_type
+    assert doc_in_db.detected_at == fixed_time
+    assert doc_in_db.file_hash == result.file_hash
+    
+    # Verify file is saved to disk
+    validate_file_saved(document_service, result.file_hash, sample_file_bytes)
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  @patch('app.services.document_service.datetime')
+  def test_i_can_create_document_with_existing_content(
+      self,
+      mock_datetime,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test creating document when content already exists (deduplication)."""
+    # Setup mocks
+    fixed_time = datetime(2025, 1, 1, 10, 30, 0)
+    mock_datetime.now.return_value = fixed_time
+    mock_magic.return_value = "application/pdf"
+    
+    # Create first document
+    first_doc = document_service.create_document(
+      "/test/first.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Create second document with same content
+    second_doc = document_service.create_document(
+      "/test/second.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Verify both documents exist but share same hash
+    assert first_doc.file_hash == second_doc.file_hash
+    assert first_doc.filename != second_doc.filename
+    assert first_doc.filepath != second_doc.filepath
+  
+  def test_i_cannot_create_document_with_unsupported_file_type(
+      self,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test that unsupported file types raise ValueError."""
+    with pytest.raises(ValueError, match="Unsupported file type"):
+      document_service.create_document(
+        "/test/test.xyz",  # Unsupported extension
+        sample_file_bytes,
+        "utf-8"
+      )
+  
+  def test_i_cannot_create_document_with_empty_file_path(
+      self,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test that empty file path raises ValueError."""
+    with pytest.raises(ValueError):
+      document_service.create_document(
+        "",  # Empty path
+        sample_file_bytes,
+        "utf-8"
+      )
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_create_document_with_empty_bytes(
+      self,
+      mock_magic,
+      document_service
+  ):
+    """Test behavior with empty file bytes."""
+    # Setup
+    mock_magic.return_value = "text/plain"
+    
+    # Execute with empty bytes
+    result = document_service.create_document(
+      "/test/empty.txt",
+      b"",  # Empty bytes
+      "utf-8"
+    )
+    
+    # Verify file is saved to disk
+    validate_file_saved(document_service, result.file_hash, b"")
+
+
+class TestGetMethods:
+  """Tests for document retrieval methods."""
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_get_document_by_id(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test retrieving document by ID."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute
+    result = document_service.get_document_by_id(created_doc.id)
+    
+    # Verify
+    assert result is not None
+    assert result.id == created_doc.id
+    assert result.filename == created_doc.filename
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_get_document_by_hash(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test retrieving document by file hash."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute
+    result = document_service.get_document_by_hash(created_doc.file_hash)
+    
+    # Verify
+    assert result is not None
+    assert result.file_hash == created_doc.file_hash
+    assert result.filename == created_doc.filename
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_get_document_by_filepath(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test retrieving document by file path."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    test_path = "/test/unique_test.pdf"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      test_path,
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute
+    result = document_service.get_document_by_filepath(test_path)
+    
+    # Verify
+    assert result is not None
+    assert result.filepath == test_path
+    assert result.id == created_doc.id
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_get_document_content(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test retrieving document with associated content."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute
+    result = document_service.get_document_content_by_hash(created_doc.file_hash)
+    
+    # Verify
+    assert result == sample_file_bytes
+  
+  def test_i_cannot_get_nonexistent_document_by_id(
+      self,
+      document_service
+  ):
+    """Test that nonexistent document returns None."""
+    # Execute with random ObjectId
+    result = document_service.get_document_by_id(ObjectId())
+    
+    # Verify
+    assert result is None
+  
+  def test_i_cannot_get_nonexistent_document_by_hash(
+      self,
+      document_service
+  ):
+    """Test that nonexistent document hash returns None."""
+    # Execute
+    result = document_service.get_document_by_hash("nonexistent_hash")
+    
+    # Verify
+    assert result is None
+
+
+class TestPaginationAndCounting:
+  """Tests for document listing and counting."""
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_list_documents_with_pagination(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test document listing with pagination parameters."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create multiple documents
+    for i in range(5):
+      document_service.create_document(
+        f"/test/test{i}.pdf",
+        sample_file_bytes + bytes(str(i), 'utf-8'),  # Make each file unique
+        "utf-8"
+      )
+    
+    # Execute with pagination
+    result = document_service.list_documents(skip=1, limit=2)
+    
+    # Verify
+    assert len(result) == 2
+    
+    # Test counting
+    total_count = document_service.count_documents()
+    assert total_count == 5
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_count_documents(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test document counting."""
+    # Setup
+    mock_magic.return_value = "text/plain"
+    
+    # Initially should be 0
+    initial_count = document_service.count_documents()
+    assert initial_count == 0
+    
+    # Create some documents
+    for i in range(3):
+      document_service.create_document(
+        f"/test/test{i}.txt",
+        sample_file_bytes + bytes(str(i), 'utf-8'),
+        "utf-8"
+      )
+    
+    # Execute
+    final_count = document_service.count_documents()
+    
+    # Verify
+    assert final_count == 3
+
+
+class TestUpdateAndDelete:
+  """Tests for document update and deletion operations."""
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_update_document_metadata(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test updating document metadata."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute update
+    update_data = {"metadata": {"page_count": 5}}
+    result = document_service.update_document(created_doc.id, update_data)
+    
+    # Verify
+    assert result is not None
+    assert result.metadata.get("page_count") == 5
+    assert result.filename == created_doc.filename
+    assert result.filepath == created_doc.filepath
+    assert result.file_hash == created_doc.file_hash
+    assert result.file_type == created_doc.file_type
+    assert result.metadata == update_data['metadata']
+  
+  def test_i_can_update_document_content(
+      self,
+      document_service,
+      sample_file_bytes
+  ):
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Execute update
+    update_data = {"file_bytes": b"this is an updated file content"}
+    result = document_service.update_document(created_doc.id, update_data)
+    
+    assert result.filename == created_doc.filename
+    assert result.filepath == created_doc.filepath
+    assert result.file_hash != created_doc.file_hash
+    assert result.file_type == created_doc.file_type
+    assert result.metadata == created_doc.metadata
+    
+    # Verify file is saved to disk
+    validate_file_saved(document_service, result.file_hash, b"this is an updated file content")
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_delete_document_and_orphaned_content(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test deleting document with orphaned content cleanup."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create a document
+    created_doc = document_service.create_document(
+      "/test/test.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Verify content exists
+    validate_file_saved(document_service, created_doc.file_hash, sample_file_bytes)
+    
+    # Execute deletion
+    result = document_service.delete_document(created_doc.id)
+    
+    # Verify document and content are deleted
+    assert result is True
+    
+    deleted_doc = document_service.get_document_by_id(created_doc.id)
+    assert deleted_doc is None
+    
+    # validate content is deleted
+    file_hash = created_doc.file_hash[:24]
+    target_file_path = os.path.join(document_service.objects_folder, file_hash[:24], file_hash)
+    assert not os.path.exists(target_file_path)
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_delete_document_without_affecting_shared_content(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test deleting document without removing shared content."""
+    # Setup
+    mock_magic.return_value = "application/pdf"
+    
+    # Create two documents with same content
+    doc1 = document_service.create_document(
+      "/test/test1.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    doc2 = document_service.create_document(
+      "/test/test2.pdf",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # They should share the same hash
+    assert doc1.file_hash == doc2.file_hash
+    
+    # Delete first document
+    result = document_service.delete_document(doc1.id)
+    assert result is True
+    
+    # Verify first document is deleted but content still exists
+    deleted_doc = document_service.get_document_by_id(doc1.id)
+    assert deleted_doc is None
+    
+    remaining_doc = document_service.get_document_by_id(doc2.id)
+    assert remaining_doc is not None
+    
+    validate_file_saved(document_service, doc2.file_hash, sample_file_bytes)
+
+
+class TestHashCalculation:
+  """Tests for file hash calculation utility."""
+  
+  def test_i_can_calculate_consistent_file_hash(self, document_service):
+    """Test that file hash calculation is consistent."""
+    test_bytes = b"Test content for hashing"
+    
+    # Calculate hash multiple times
+    hash1 = document_service._calculate_file_hash(test_bytes)
+    hash2 = document_service._calculate_file_hash(test_bytes)
+    
+    # Should be identical
+    assert hash1 == hash2
+    assert len(hash1) == 64  # SHA256 produces 64-character hex string
+  
+  def test_i_get_different_hashes_for_different_content(self, document_service):
+    """Test that different content produces different hashes."""
+    content1 = b"First content"
+    content2 = b"Second content"
+    
+    hash1 = document_service._calculate_file_hash(content1)
+    hash2 = document_service._calculate_file_hash(content2)
+    
+    assert hash1 != hash2
+
+
+class TestFileTypeDetection:
+  """Tests for file type detection."""
+  
+  def test_i_can_detect_pdf_file_type(self, document_service):
+    """Test PDF file type detection."""
+    file_type = document_service._detect_file_type("/path/to/document.pdf")
+    assert file_type == FileType.PDF
+  
+  def test_i_can_detect_txt_file_type(self, document_service):
+    """Test text file type detection."""
+    file_type = document_service._detect_file_type("/path/to/document.txt")
+    assert file_type == FileType.TXT
+  
+  def test_i_can_detect_docx_file_type(self, document_service):
+    """Test DOCX file type detection."""
+    file_type = document_service._detect_file_type("/path/to/document.docx")
+    assert file_type == FileType.DOCX
+  
+  def test_i_cannot_detect_unsupported_file_type(self, document_service):
+    """Test unsupported file type raises ValueError."""
+    with pytest.raises(ValueError, match="Unsupported file type"):
+      document_service._detect_file_type("/path/to/document.xyz")
+
+
+class TestCreatePdf:
+  """Tests for create_pdf method."""
+  
+  @patch('app.services.document_service.convert_to_pdf')
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_create_pdf_successfully(
+      self,
+      mock_magic,
+      mock_convert_to_pdf,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test creating PDF from an existing document."""
+    # Setup
+    mock_magic.return_value = "text/plain"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.txt",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Mock the PDF conversion
+    pdf_path = os.path.join(document_service.temp_folder, "converted.pdf")
+    mock_convert_to_pdf.return_value = pdf_path
+    
+    # Write a sample PDF file that the conversion would create
+    pdf_content = b"This is PDF content"
+    os.makedirs(os.path.dirname(pdf_path), exist_ok=True)
+    with open(pdf_path, "wb") as f:
+      f.write(pdf_content)
+    
+    # Execute
+    result = document_service.create_pdf(created_doc.id)
+    
+    # Verify
+    assert result is True
+    
+    # Get the updated document
+    updated_doc = document_service.get_document_by_id(created_doc.id)
+    assert updated_doc.pdf_file_hash is not None
+    
+    # Verify the PDF content was saved
+    pdf_hash = document_service._calculate_file_hash(pdf_content)
+    assert updated_doc.pdf_file_hash == pdf_hash
+    
+    # Verify convert_to_pdf was called with correct arguments
+    doc_path = document_service.get_document_path(created_doc.file_hash)
+    mock_convert_to_pdf.assert_called_once_with(doc_path, document_service.temp_folder)
+    
+    # Verify content exists on disk
+    validate_file_saved(document_service, pdf_hash, pdf_content)
+    
+    # Verify PDF hash was added to document
+    updated_doc = document_service.get_document_by_id(created_doc.id)
+    pdf_hash = document_service._calculate_file_hash(pdf_content)
+    assert updated_doc.pdf_file_hash == pdf_hash
+  
+  @patch('app.services.document_service.convert_to_pdf')
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_can_reuse_existing_pdf(
+      self,
+      mock_magic,
+      mock_convert_to_pdf,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test that if PDF already exists, it doesn't recreate it."""
+    # Setup
+    mock_magic.return_value = "text/plain"
+    
+    # Create a document first
+    created_doc = document_service.create_document(
+      "/test/test.txt",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Create a fake PDF file and update the document
+    pdf_content = b"This is PDF content"
+    pdf_hash = document_service._calculate_file_hash(pdf_content)
+    document_service.save_content_if_needed(pdf_hash, pdf_content)
+    document_service.update_document(created_doc.id, {"pdf_file_hash": pdf_hash})
+    
+    # Execute
+    result = document_service.create_pdf(created_doc.id)
+    
+    # Verify
+    assert result is True
+    
+    # Verify convert_to_pdf was NOT called
+    mock_convert_to_pdf.assert_not_called()
+  
+  def test_i_cannot_create_pdf_for_nonexistent_document(
+      self,
+      document_service
+  ):
+    """Test behavior when document ID doesn't exist."""
+    # Execute with random ObjectId
+    result = document_service.create_pdf(ObjectId())
+    
+    # Verify
+    assert result is False
+  
+  @patch('app.services.document_service.magic.from_buffer')
+  def test_i_cannot_create_pdf_when_file_content_missing(
+      self,
+      mock_magic,
+      document_service,
+      sample_file_bytes
+  ):
+    """Test behavior when file content doesn't exist."""
+    # Setup
+    mock_magic.return_value = "text/plain"
+    
+    # Create a document
+    created_doc = document_service.create_document(
+      "/test/test.txt",
+      sample_file_bytes,
+      "utf-8"
+    )
+    
+    # Simulate missing content by removing file
+    file_path = document_service.get_document_path(created_doc.file_hash)
+    os.remove(file_path)
+    
+    # Execute
+    result = document_service.create_pdf(created_doc.id)
+    
+    # Verify
+    assert result is False

tests/services/test_job_service.py

@@ -0,0 +1,537 @@
+"""
+Unit tests for JobService using in-memory MongoDB.
+
+Tests the business logic operations with real MongoDB operations
+using mongomock for better integration testing.
+"""
+
+import pytest
+from bson import ObjectId
+from mongomock.mongo_client import MongoClient
+
+from app.exceptions.job_exceptions import InvalidStatusTransitionError
+from app.models.job import ProcessingStatus
+from app.models.types import PyObjectId
+from app.services.job_service import JobService
+
+
+@pytest.fixture
+def in_memory_database():
+  """Create an in-memory database for testing."""
+  client = MongoClient()
+  return client.test_database
+
+
+@pytest.fixture
+def job_service(in_memory_database):
+  """Create JobService with in-memory repositories."""
+  service = JobService(in_memory_database).initialize()
+  return service
+
+
+@pytest.fixture
+def sample_document_id():
+  """Sample file ObjectId."""
+  return PyObjectId()
+
+
+@pytest.fixture
+def sample_task_id():
+  """Sample Celery task UUID."""
+  return "550e8400-e29b-41d4-a716-446655440000"
+
+
+class TestCreateJob:
+  """Tests for create_job method."""
+  
+  def test_i_can_create_job_with_task_id(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test creating job with task ID."""
+    # Execute
+    result = job_service.create_job(sample_document_id, sample_task_id)
+    
+    # Verify job creation
+    assert result is not None
+    assert result.document_id == sample_document_id
+    assert result.task_id == sample_task_id
+    assert result.status == ProcessingStatus.PENDING
+    assert result.created_at is not None
+    assert result.started_at is None
+    assert result.error_message is None
+    
+    # Verify job exists in database
+    job_in_db = job_service.get_job_by_id(result.id)
+    assert job_in_db is not None
+    assert job_in_db.id == result.id
+    assert job_in_db.document_id == sample_document_id
+    assert job_in_db.task_id == sample_task_id
+    assert job_in_db.status == ProcessingStatus.PENDING
+  
+  def test_i_can_create_job_without_task_id(
+      self,
+      job_service,
+      sample_document_id
+  ):
+    """Test creating job without task ID."""
+    # Execute
+    result = job_service.create_job(sample_document_id)
+    
+    # Verify job creation
+    assert result is not None
+    assert result.document_id == sample_document_id
+    assert result.task_id is None
+    assert result.status == ProcessingStatus.PENDING
+    assert result.created_at is not None
+    assert result.started_at is None
+    assert result.error_message is None
+
+
+class TestGetJobMethods:
+  """Tests for job retrieval methods."""
+  
+  def test_i_can_get_job_by_id(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test retrieving job by ID."""
+    # Create a job first
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    
+    # Execute
+    result = job_service.get_job_by_id(created_job.id)
+    
+    # Verify
+    assert result is not None
+    assert result.id == created_job.id
+    assert result.document_id == created_job.document_id
+    assert result.task_id == created_job.task_id
+    assert result.status == created_job.status
+  
+  def test_i_can_get_jobs_by_status(
+      self,
+      job_service,
+      sample_document_id
+  ):
+    """Test retrieving jobs by status."""
+    # Create jobs with different statuses
+    pending_job = job_service.create_job(sample_document_id, "pending-task")
+    
+    processing_job = job_service.create_job(ObjectId(), "processing-task")
+    job_service.mark_job_as_started(processing_job.id)
+    
+    completed_job = job_service.create_job(ObjectId(), "completed-task")
+    job_service.mark_job_as_started(completed_job.id)
+    job_service.mark_job_as_completed(completed_job.id)
+    
+    # Execute - get pending jobs
+    pending_results = job_service.get_jobs_by_status(ProcessingStatus.PENDING)
+    
+    # Verify
+    assert len(pending_results) == 1
+    assert pending_results[0].id == pending_job.id
+    assert pending_results[0].status == ProcessingStatus.PENDING
+    
+    # Execute - get processing jobs
+    processing_results = job_service.get_jobs_by_status(ProcessingStatus.PROCESSING)
+    assert len(processing_results) == 1
+    assert processing_results[0].status == ProcessingStatus.PROCESSING
+    
+    # Execute - get completed jobs
+    completed_results = job_service.get_jobs_by_status(ProcessingStatus.COMPLETED)
+    assert len(completed_results) == 1
+    assert completed_results[0].status == ProcessingStatus.COMPLETED
+
+
+class TestUpdateStatus:
+  """Tests for mark_job_as_started method."""
+  
+  def test_i_can_mark_pending_job_as_started(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test marking pending job as started (PENDING → PROCESSING)."""
+    # Create a pending job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    assert created_job.status == ProcessingStatus.PENDING
+    
+    # Execute
+    result = job_service.mark_job_as_started(created_job.id)
+    
+    # Verify status transition
+    assert result is not None
+    assert result.id == created_job.id
+    assert result.status == ProcessingStatus.PROCESSING
+    
+    # Verify in database
+    updated_job = job_service.get_job_by_id(created_job.id)
+    assert updated_job.status == ProcessingStatus.PROCESSING
+  
+  def test_i_cannot_mark_processing_job_as_started(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that processing job cannot be marked as started."""
+    # Create and start a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    
+    # Try to start it again
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_started(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.PROCESSING
+    assert exc_info.value.target_status == ProcessingStatus.PROCESSING
+  
+  def test_i_cannot_mark_completed_job_as_started(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that completed job cannot be marked as started."""
+    # Create, start, and complete a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_completed(created_job.id)
+    
+    # Try to start it again
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_started(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.COMPLETED
+    assert exc_info.value.target_status == ProcessingStatus.PROCESSING
+  
+  def test_i_cannot_mark_failed_job_as_started(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that failed job cannot be marked as started."""
+    # Create, start, and fail a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_failed(created_job.id, "Test error")
+    
+    # Try to start it again
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_started(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.FAILED
+    assert exc_info.value.target_status == ProcessingStatus.PROCESSING
+  
+  def test_i_can_mark_processing_job_as_completed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test marking processing job as completed (PROCESSING → COMPLETED)."""
+    # Create and start a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    started_job = job_service.mark_job_as_started(created_job.id)
+    
+    # Execute
+    result = job_service.mark_job_as_completed(created_job.id)
+    
+    # Verify status transition
+    assert result is not None
+    assert result.id == created_job.id
+    assert result.status == ProcessingStatus.COMPLETED
+    
+    # Verify in database
+    updated_job = job_service.get_job_by_id(created_job.id)
+    assert updated_job.status == ProcessingStatus.COMPLETED
+  
+  def test_i_cannot_mark_pending_job_as_completed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that pending job cannot be marked as completed."""
+    # Create a pending job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    
+    # Try to complete it directly
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_completed(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.PENDING
+    assert exc_info.value.target_status == ProcessingStatus.COMPLETED
+  
+  def test_i_cannot_mark_completed_job_as_completed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that completed job cannot be marked as completed again."""
+    # Create, start, and complete a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_completed(created_job.id)
+    
+    # Try to complete it again
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_completed(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.COMPLETED
+    assert exc_info.value.target_status == ProcessingStatus.COMPLETED
+  
+  def test_i_cannot_mark_failed_job_as_completed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that failed job cannot be marked as completed."""
+    # Create, start, and fail a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_failed(created_job.id, "Test error")
+    
+    # Try to complete it
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_completed(created_job.id)
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.FAILED
+    assert exc_info.value.target_status == ProcessingStatus.COMPLETED
+  
+  def test_i_can_mark_processing_job_as_failed_with_error_message(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test marking processing job as failed with error message."""
+    # Create and start a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    started_job = job_service.mark_job_as_started(created_job.id)
+    
+    error_message = "Processing failed due to invalid file format"
+    
+    # Execute
+    result = job_service.mark_job_as_failed(created_job.id, error_message)
+    
+    # Verify status transition
+    assert result is not None
+    assert result.id == created_job.id
+    assert result.status == ProcessingStatus.FAILED
+    assert result.error_message == error_message
+    
+    # Verify in database
+    updated_job = job_service.get_job_by_id(created_job.id)
+    assert updated_job.status == ProcessingStatus.FAILED
+    assert updated_job.error_message == error_message
+  
+  def test_i_can_mark_processing_job_as_failed_without_error_message(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test marking processing job as failed without error message."""
+    # Create and start a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    
+    # Execute without error message
+    result = job_service.mark_job_as_failed(created_job.id)
+    
+    # Verify status transition
+    assert result is not None
+    assert result.status == ProcessingStatus.FAILED
+    assert result.error_message is None
+  
+  def test_i_cannot_mark_pending_job_as_failed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that pending job cannot be marked as failed."""
+    # Create a pending job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    
+    # Try to fail it directly
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_failed(created_job.id, "Test error")
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.PENDING
+    assert exc_info.value.target_status == ProcessingStatus.FAILED
+  
+  def test_i_cannot_mark_completed_job_as_failed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that completed job cannot be marked as failed."""
+    # Create, start, and complete a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_completed(created_job.id)
+    
+    # Try to fail it
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_failed(created_job.id, "Test error")
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.COMPLETED
+    assert exc_info.value.target_status == ProcessingStatus.FAILED
+  
+  def test_i_cannot_mark_failed_job_as_failed(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that failed job cannot be marked as failed again."""
+    # Create, start, and fail a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    job_service.mark_job_as_failed(created_job.id, "First error")
+    
+    # Try to fail it again
+    with pytest.raises(InvalidStatusTransitionError) as exc_info:
+      job_service.mark_job_as_failed(created_job.id, "Second error")
+    
+    # Verify exception details
+    assert exc_info.value.current_status == ProcessingStatus.FAILED
+    assert exc_info.value.target_status == ProcessingStatus.FAILED
+  
+  def test_i_can_update_job_status(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test that failed job cannot be marked as failed again."""
+    # Create, start, and fail a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    job_service.mark_job_as_started(created_job.id)
+    
+    # Execute without error message
+    result = job_service.update_job_status(created_job.id, ProcessingStatus.SAVING_OBJECT)
+    
+    # Verify status transition
+    assert result is not None
+    assert result.status == ProcessingStatus.SAVING_OBJECT
+    assert result.error_message is None
+
+
+class TestDeleteJob:
+  """Tests for delete_job method."""
+  
+  def test_i_can_delete_existing_job(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test deleting an existing job."""
+    # Create a job
+    created_job = job_service.create_job(sample_document_id, sample_task_id)
+    
+    # Verify job exists
+    job_before_delete = job_service.get_job_by_id(created_job.id)
+    assert job_before_delete is not None
+    
+    # Execute deletion
+    result = job_service.delete_job(created_job.id)
+    
+    # Verify deletion
+    assert result is True
+    
+    # Verify job no longer exists
+    deleted_job = job_service.get_job_by_id(created_job.id)
+    assert deleted_job is None
+  
+  def test_i_cannot_delete_nonexistent_job(
+      self,
+      job_service
+  ):
+    """Test deleting a nonexistent job returns False."""
+    # Execute deletion with random ObjectId
+    result = job_service.delete_job(ObjectId())
+    
+    # Verify
+    assert result is False
+
+
+class TestStatusTransitionValidation:
+  """Tests for status transition validation across different scenarios."""
+  
+  def test_valid_job_lifecycle_flow(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test complete valid job lifecycle: PENDING → PROCESSING → COMPLETED."""
+    # Create job (PENDING)
+    job = job_service.create_job(sample_document_id, sample_task_id)
+    assert job.status == ProcessingStatus.PENDING
+    
+    # Start job (PENDING → PROCESSING)
+    started_job = job_service.mark_job_as_started(job.id)
+    assert started_job.status == ProcessingStatus.PROCESSING
+    
+    # Complete job (PROCESSING → COMPLETED)
+    completed_job = job_service.mark_job_as_completed(job.id)
+    assert completed_job.status == ProcessingStatus.COMPLETED
+  
+  def test_valid_job_failure_flow(
+      self,
+      job_service,
+      sample_document_id,
+      sample_task_id
+  ):
+    """Test valid job failure: PENDING → PROCESSING → FAILED."""
+    # Create job (PENDING)
+    job = job_service.create_job(sample_document_id, sample_task_id)
+    assert job.status == ProcessingStatus.PENDING
+    
+    # Start job (PENDING → PROCESSING)
+    started_job = job_service.mark_job_as_started(job.id)
+    assert started_job.status == ProcessingStatus.PROCESSING
+    
+    # Fail job (PROCESSING → FAILED)
+    failed_job = job_service.mark_job_as_failed(job.id, "Test failure")
+    assert failed_job.status == ProcessingStatus.FAILED
+    assert failed_job.error_message == "Test failure"
+  
+  def test_job_operations_with_empty_database(
+      self,
+      job_service
+  ):
+    """Test job operations when database is empty."""
+    # Try to get nonexistent job
+    result = job_service.get_job_by_id(ObjectId())
+    assert result is None
+    
+    # Try to get jobs by status when none exist
+    pending_jobs = job_service.get_jobs_by_status(ProcessingStatus.PENDING)
+    assert pending_jobs == []
+    
+    # Try to delete nonexistent job
+    delete_result = job_service.delete_job(ObjectId())
+    assert delete_result is False