"""Configuration management for myclaude."""

import json
from pathlib import Path

CONFIG_DIR = Path.home() / ".myclaude"
CONFIG_FILE = CONFIG_DIR / "config.json"


def save_config(repo_url: str) -> None:
  """Save or update the myclaude configuration file.

  Args:
      repo_url: The SSH URL of the central git repository.
  """
  CONFIG_DIR.mkdir(parents=True, exist_ok=True)
  existing = _read_file() if CONFIG_FILE.exists() else {}
  existing["repo_url"] = repo_url
  with CONFIG_FILE.open("w", encoding="utf-8") as f:
    json.dump(existing, f, indent=2)


def load_config() -> dict:
  """Load the myclaude configuration file.

  Returns:
      The configuration as a dictionary.

  Raises:
      FileNotFoundError: If the configuration file does not exist.
  """
  if not CONFIG_FILE.exists():
    raise FileNotFoundError(
      f"Configuration file not found at {CONFIG_FILE}. "
      "Run 'myclaude init . --repo <url>' first."
    )
  return _read_file()


def get_repo_url() -> str:
  """Get the configured central repository URL.

  Returns:
      The SSH URL of the central git repository.

  Raises:
      FileNotFoundError: If the configuration file does not exist.
      KeyError: If repo_url is not found in the configuration.
  """
  config = load_config()
  if "repo_url" not in config:
    raise KeyError(
      "No 'repo_url' found in configuration. "
      "Run 'myclaude init . --repo <url>' first."
    )
  return config["repo_url"]


def _read_file() -> dict:
  with CONFIG_FILE.open("r", encoding="utf-8") as f:
    return json.load(f)