from enum import Enum

from core.concept import Concept


class BuiltinConcepts(Enum):
    """
    List of builtin concepts that do no need any specific implementation
    Please note that the value of the enum is informal. It is not used in the system
    For example, the concept 'NODE' DOES NOT have the key, the id or whatever 200
    The key if the name of the concept
    The id is a sequential number given just before the concept is saved in sdp

    The values of the enum is not used the code
    """
    SHEERKA = "sheerka"

    BEFORE_PARSING = "before parsing"  # activated before evaluation by the parsers
    PARSING = "parsing"  # activated during the parsing. It contains the text to parse
    AFTER_PARSING = "after parsing"  # after parsing
    BEFORE_EVALUATION = "before evaluation"  # before evaluation
    EVALUATION = "evaluation"  # activated when the parsing process seems to be finished
    AFTER_EVALUATION = "after evaluation"  # activated when the parsing process seems to be finished
    BEFORE_RENDERING = "before rendering"  # activate before the output is rendered
    RENDERING = "rendering"  # rendering the response from sheerka
    AFTER_RENDERING = "after rendering"  # rendering the response from sheerka

    USER_INPUT = "user input"  # represent an input from an user
    SUCCESS = "success"
    ERROR = "error"
    UNKNOWN_CONCEPT = "unknown concept"  # the request concept is not recognized
    RETURN_VALUE = "return value"  # a value is returned
    CONCEPT_TOO_LONG = "concept too long"  # concept cannot be processed by exactConcept parser
    NEW_CONCEPT = "new concept"  # when a new concept is added
    UNKNOWN_PROPERTY = "unknown property"  # when requesting for a unknown property
    PARSER_RESULT = "parser result"
    TOO_MANY_SUCCESS = "too many success"  # when expecting a limited number of successful return value
    TOO_MANY_ERRORS = "too many errors"  # when expecting a limited number of successful return value
    NOT_FOR_ME = "not for me"  # a parser recognize that the entry is not meant for it
    IS_EMPTY = "is empty"  # when a set is empty
    INVALID_RETURN_VALUE = "invalid return value"  # the return value of an evaluator is not correct
    CONCEPT_ALREADY_DEFINED = "concept already defined"  # when you try to add the same concept twice
    NOP = "no operation"  # no operation concept. Does nothing
    CONCEPT_EVAL_ERROR = "concept evaluation error"  # cannot evaluate a property or metadata of a concept
    ENUMERATION = "enum"  # represents a list or a set
    LIST = "list"  # represents a list
    CONCEPT_ALREADY_IN_SET = "concept already in set"
    EVALUATOR_PRE_PROCESS = "evaluator pre process"  # used modify / tweak behaviour of evaluators
    CONCEPT_EVAL_REQUESTED = "concept eval requested"
    REDUCE_REQUESTED = "reduce requested"  # remove meaningless error when possible

    NODE = "node"
    GENERIC_NODE = "generic node"
    IDENTIFIER_NODE = "identifier node"

    def __repr__(self):
        return "__" + self.name

    def __str__(self):
        return "__" + self.name


BuiltinUnique = [
    BuiltinConcepts.BEFORE_PARSING,
    BuiltinConcepts.PARSING,
    BuiltinConcepts.AFTER_PARSING,
    BuiltinConcepts.BEFORE_EVALUATION,
    BuiltinConcepts.EVALUATION,
    BuiltinConcepts.AFTER_EVALUATION,
    BuiltinConcepts.BEFORE_RENDERING,
    BuiltinConcepts.RENDERING,
    BuiltinConcepts.AFTER_RENDERING,
    BuiltinConcepts.SUCCESS,
    BuiltinConcepts.NOP,
    BuiltinConcepts.CONCEPT_EVAL_REQUESTED,
    BuiltinConcepts.REDUCE_REQUESTED,
]

BuiltinErrors = [str(e) for e in {
    BuiltinConcepts.ERROR,
    BuiltinConcepts.UNKNOWN_CONCEPT,
    BuiltinConcepts.CONCEPT_TOO_LONG,
    BuiltinConcepts.UNKNOWN_PROPERTY,
    BuiltinConcepts.TOO_MANY_SUCCESS,
    BuiltinConcepts.TOO_MANY_ERRORS,
    BuiltinConcepts.INVALID_RETURN_VALUE,
    BuiltinConcepts.CONCEPT_ALREADY_DEFINED,
    BuiltinConcepts.CONCEPT_EVAL_ERROR,
    BuiltinConcepts.CONCEPT_ALREADY_IN_SET,
}]

"""
Some concepts have a specific implementation
It's mainly to ease the usage
"""


class UserInputConcept(Concept):
    def __init__(self, text=None, user_name=None):
        super().__init__(BuiltinConcepts.USER_INPUT, True, False, BuiltinConcepts.USER_INPUT, text)
        self.set_prop("user_name", user_name)

    @property
    def text(self):
        return self.body

    @property
    def user_name(self):
        return self.props["user_name"].value

    def __repr__(self):
        return f"({self.id}){self.name}: '{self.body}'"


class ErrorConcept(Concept):
    def __init__(self, error=None):
        super().__init__(BuiltinConcepts.ERROR, True, False, BuiltinConcepts.ERROR, error)

    def __repr__(self):
        return f"({self.id}){self.name}: {self.body}"


class ReturnValueConcept(Concept):
    """
    This class represents the result of a data flow processing
    It's the main input for the evaluators
    """

    def __init__(self, who=None, status=None, value=None, message=None, parents=None):
        super().__init__(BuiltinConcepts.RETURN_VALUE, True, False, BuiltinConcepts.RETURN_VALUE, value)
        self.set_prop("who", who)
        self.set_prop("status", status)
        self.set_prop("message", message)
        self.set_prop("parents", parents)

    @property
    def who(self):
        return self.props["who"].value

    @who.setter
    def who(self, value):
        self.set_prop("who", value)

    @property
    def status(self):
        return self.props["status"].value

    @status.setter
    def status(self, value):
        self.set_prop("status", value)

    @property
    def value(self):
        return self.body

    @value.setter
    def value(self, value):
        self.metadata.body = value

    @property
    def message(self):
        return self.props["message"].value

    @message.setter
    def message(self, value):
        self.set_prop("message", value)

    @property
    def parents(self):
        return self.props["parents"].value

    @parents.setter
    def parents(self, value):
        self.set_prop("parents", value)

    def __repr__(self):
        return f"ReturnValue(who={self.who}, status={self.status}, value={self.value}, message={self.message})"

    def __eq__(self, other):
        if not isinstance(other, ReturnValueConcept):
            return False

        return self.who == other.who and \
               self.status == other.status and \
               self.value == other.value and \
               self.message == other.message

    def __hash__(self):
        if hasattr(self.value, "__iter__") and not isinstance(self.value, str):
            value_hash = hash(tuple(self.value))
        else:
            value_hash = hash(self.value)

        return hash((self.who, self.status, value_hash))


class UnknownPropertyConcept(Concept):
    """
    This error is raised when, during sheerka.new(), an unknown property is asked
    """

    def __init__(self, property_name=None, concept=None):
        super().__init__(BuiltinConcepts.UNKNOWN_PROPERTY, True, False, BuiltinConcepts.UNKNOWN_PROPERTY, property_name)
        self.set_prop("concept", concept)

    def __repr__(self):
        return f"UnknownProperty(property={self.property_name}, concept={self.concept})"

    @property
    def concept(self):
        return self.props["concept"].value

    @property
    def property_name(self):
        return self.body


class ParserResultConcept(Concept):
    """
    Result of a parsing
    """

    def __init__(self, parser=None, source=None, value=None, try_parsed=None):
        super().__init__(BuiltinConcepts.PARSER_RESULT, True, False, BuiltinConcepts.PARSER_RESULT, value)
        self.set_prop("parser", parser)
        self.set_prop("source", source)
        self.set_prop("try_parsed", try_parsed)  # in case of error, what was found before the error

    def __repr__(self):
        text = f"ParserResult(parser={self.props['parser'].value}"
        source = self.props['source'].value
        text += f", source='{source}')" if source else f", body='{self.body}')"
        return text

    def __eq__(self, other):
        if not isinstance(other, ParserResultConcept):
            return False

        return self.source == other.source and \
               self.parser == other.parser and \
               self.body == other.body and \
               self.try_parsed == other.try_parsed

    def __hash__(self):
        return hash(self.metadata.name)

    @property
    def value(self):
        return self.body

    @property
    def try_parsed(self):
        return self.props["try_parsed"].value

    @property
    def source(self):
        return self.props["source"].value

    @property
    def parser(self):
        return self.props["parser"].value


class InvalidReturnValueConcept(Concept):
    """
    Error returned when an evaluator is not correctly coded
    The accepted return value are
        ReturnValueConcept, list of ReturnValueConcept or None
    """

    def __init__(self, return_value=None, evaluator=None):
        super().__init__(
            BuiltinConcepts.INVALID_RETURN_VALUE,
            True,
            False,
            BuiltinConcepts.INVALID_RETURN_VALUE,
            return_value)
        self.set_prop("evaluator", evaluator)


class ConceptEvalError(Concept):
    def __init__(self, error=None, concept=None, property_name=None):
        super().__init__(BuiltinConcepts.CONCEPT_EVAL_ERROR,
                         True,
                         False,
                         BuiltinConcepts.CONCEPT_EVAL_ERROR,
                         error)
        self.set_prop("concept", concept)
        self.set_prop("property_name", property_name)

    def __repr__(self):
        return f"ConceptEvalError(error={self.error}, concept={self.concept}, property={self.property_name})"

    @property
    def error(self):
        return self.body

    @property
    def concept(self):
        return self.props["concept"].value

    @property
    def property_name(self):
        return self.props["property_name"].value


class EnumerationConcept(Concept):
    def __init__(self, iteration=None):
        super().__init__(BuiltinConcepts.ENUMERATION, True, False, BuiltinConcepts.ENUMERATION, iteration)

    def __iter__(self):
        return iter(self.body)


class ListConcept(Concept):
    def __init__(self, items=None):
        super().__init__(BuiltinConcepts.LIST, True, False, BuiltinConcepts.LIST, items or [])

    def append(self, obj):
        self.body.append(obj)

    def __len__(self):
        return len(self.body)

    def __getitem__(self, key):
        return self.body[key]

    def __setitem__(self, key, value):
        self.body[key] = value

    def __iter__(self):
        return iter(self.body)

    def __contains__(self, item):
        return item in self.body


class ConceptAlreadyInSet(Concept):
    def __init__(self, concept=None, concept_set=None):
        super().__init__(BuiltinConcepts.CONCEPT_ALREADY_IN_SET,
                         True,
                         False,
                         BuiltinConcepts.CONCEPT_ALREADY_IN_SET,
                         concept)
        self.set_prop("concept_set", concept_set)

    def __repr__(self):
        return f"ConceptAlreadyInSet(concept={self.concept}, concept_set={self.concept_set})"

    @property
    def concept(self):
        return self.body

    @property
    def concept_set(self):
        return self.props["concept_set"].value