#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from typing import Any

from fastapi import Request, Response
from fastapi.security.utils import get_authorization_scheme_param
from starlette.authentication import AuthCredentials, AuthenticationBackend, AuthenticationError
from starlette.requests import HTTPConnection

from app.admin.schema.org import CurrentIntentOrgIns
from common.exception.errors import TokenError
from common.log import log
from common.security.jwt_call_center import jwt_call_center_authentication
from core.conf import settings
from utils.serializers import MsgSpecJSONResponse


class _AuthenticationError(AuthenticationError):
    """重写内部认证错误类"""

    def __init__(self, *, code: int = None, msg: str = None, headers: dict[str, Any] | None = None):
        self.code = code
        self.msg = msg
        self.headers = headers


class JwtCallCenterAuthMiddleware(AuthenticationBackend):
    """JWT 认证中间件"""

    @staticmethod
    def auth_exception_handler(conn: HTTPConnection, exc: _AuthenticationError) -> Response:
        """覆盖内部认证错误处理"""
        return MsgSpecJSONResponse(content={'code': exc.code, 'msg': exc.msg, 'data': None}, status_code=exc.code)

    async def authenticate(self, request: Request) -> tuple[AuthCredentials, CurrentIntentOrgIns] | None:
        token = request.headers.get('Authorization')
        if not token:
            return

        if request.url.path in settings.TOKEN_EXCLUDE:
            return
        scheme, token = get_authorization_scheme_param(token)
        if scheme.lower() != "bearer":
            return
        try:
            org = await jwt_call_center_authentication(token)
        except TokenError as exc:
            raise _AuthenticationError(code=exc.code, msg=exc.detail, headers=exc.headers)
        except Exception as e:
            log.error(f'JWT 授权异常：{e}')
            raise _AuthenticationError(code=getattr(e, 'code', 500), msg=getattr(e, 'msg', 'Internal Server Error'))

        # 请注意，此返回使用非标准模式，所以在认证通过时，将丢失某些标准特性
        # 标准返回模式请查看：https://www.starlette.io/authentication/
        return AuthCredentials(['authenticated']), org