from enum import IntEnum
from http import HTTPStatus


class OasstErrorCode(IntEnum):
    """
    Error codes of the Open-Assistant backend API.

    Ranges:
         0-1000: general errors
      1000-2000: tasks endpoint
      2000-3000: prompt_repository
    """

    # 0-1000: general errors
    GENERIC_ERROR = 0
    DATABASE_URI_NOT_SET = 1
    API_CLIENT_NOT_AUTHORIZED = 2
    SERVER_ERROR = 3
    TOO_MANY_REQUESTS = 429

    # 1000-2000: tasks endpoint
    TASK_INVALID_REQUEST_TYPE = 1000
    TASK_ACK_FAILED = 1001
    TASK_NACK_FAILED = 1002
    TASK_INVALID_RESPONSE_TYPE = 1003
    TASK_INTERACTION_REQUEST_FAILED = 1004
    TASK_GENERATION_FAILED = 1005

    # 2000-3000: prompt_repository
    INVALID_FRONTEND_MESSAGE_ID = 2000
    MESSAGE_NOT_FOUND = 2001
    RATING_OUT_OF_RANGE = 2002
    INVALID_RANKING_VALUE = 2003
    INVALID_TASK_TYPE = 2004
    USER_NOT_SPECIFIED = 2005
    NO_MESSAGE_TREE_FOUND = 2006
    NO_REPLIES_FOUND = 2007
    INVALID_MESSAGE = 2008
    TASK_NOT_FOUND = 2100
    TASK_EXPIRED = 2101
    TASK_PAYLOAD_TYPE_MISMATCH = 2102
    TASK_ALREADY_UPDATED = 2103
    TASK_NOT_ACK = 2104
    TASK_ALREADY_DONE = 2105
    TASK_NOT_COLLECTIVE = 2106


class OasstError(Exception):
    """Base class for Open-Assistant exceptions."""

    message: str
    error_code: int
    http_status_code: HTTPStatus

    def __init__(self, message: str, error_code: OasstErrorCode, http_status_code: HTTPStatus = HTTPStatus.BAD_REQUEST):
        super().__init__(message, error_code, http_status_code)  # make excetpion picklable (fill args member)
        self.message = message
        self.error_code = error_code
        self.http_status_code = http_status_code

    def __repr__(self) -> str:
        class_name = self.__class__.__name__
        return f'{class_name}(message="{self.message}", error_code={self.error_code}, http_status_code={self.http_status_code})'
