"""Defines the :class:`ErrorCode` class and instantiates concrete objects from JSON.

See the file error_codes.json for actual error code descriptions.
"""

from json import loads
from typing import Dict

from galaxy.util.resources import resource_string

# Error codes are provided as a convience to Galaxy API clients, but at this
# time they do represent part of the more stable interface. They can change
# without warning between releases.
UNKNOWN_ERROR_MESSAGE = "Unknown error occurred while processing request."


class ErrorCode:
    """Small class allowing object representation for error descriptions loaded from JSON."""

    def __init__(self, code: int, default_error_message: str):
        """Construct a :class:`ErrorCode` from supplied integer and error message."""
        self.code = code
        self.default_error_message = default_error_message or UNKNOWN_ERROR_MESSAGE

    def __str__(self):
        """Return the error code message."""
        return str(self.default_error_message)

    def __repr__(self):
        """Return object representation of this error code."""
        return f"ErrorCode[code={self.code},message={str(self.default_error_message)}]"

    def __int__(self):
        """Return the error code integer."""
        return self.code


def _from_dict(entry):
    """Build a :class:`ErrorCode` object from a JSON entry."""
    name = entry.get("name")
    code = entry.get("code")
    message = entry.get("message")
    return (name, ErrorCode(code, message))


error_codes_json = resource_string(__name__, "error_codes.json")
error_codes_by_name: Dict[str, ErrorCode] = {}
error_codes_by_int_code: Dict[int, ErrorCode] = {}

for entry in loads(error_codes_json):
    name, error_code_obj = _from_dict(entry)
    globals()[name] = error_code_obj
    error_codes_by_name[name] = error_code_obj
    error_codes_by_int_code[error_code_obj.code] = error_code_obj
