import datetime
import logging
from typing import Optional

from fastapi import Request
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from starlette import status
from starlette.exceptions import HTTPException

import schemas
from chalicelib.core import authorizers, users

logger = logging.getLogger(__name__)


def _get_current_auth_context(request: Request, jwt_payload: dict) -> schemas.CurrentContext:
    user = users.get(user_id=jwt_payload.get("userId", -1), tenant_id=jwt_payload.get("tenantId", -1))
    if user is None:
        logger.warning("User not found.")
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User not found.")
    request.state.authorizer_identity = "jwt"
    request.state.currentContext = schemas.CurrentContext(tenantId=jwt_payload.get("tenantId", -1),
                                                          userId=jwt_payload.get("userId", -1),
                                                          email=user["email"],
                                                          role=user["role"])
    return request.state.currentContext


class JWTAuth(HTTPBearer):
    def __init__(self, auto_error: bool = True):
        super(JWTAuth, self).__init__(auto_error=auto_error)

    async def __call__(self, request: Request) -> Optional[schemas.CurrentContext]:
        if request.url.path in ["/refresh", "/api/refresh"]:
            refresh_token = request.cookies.get("refreshToken")
            jwt_payload = authorizers.jwt_refresh_authorizer(scheme="Bearer", token=refresh_token)
            if jwt_payload is None or jwt_payload.get("jti") is None:
                raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid token or expired token.")
            auth_exists = users.refresh_auth_exists(user_id=jwt_payload.get("userId", -1),
                                                    jwt_jti=jwt_payload["jti"])
            if not auth_exists:
                raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid token or expired token.")

            credentials: HTTPAuthorizationCredentials = await super(JWTAuth, self).__call__(request)
            if credentials:
                if not credentials.scheme == "Bearer":
                    raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST,
                                        detail="Invalid authentication scheme.")
                old_jwt_payload = authorizers.jwt_authorizer(scheme=credentials.scheme, token=credentials.credentials,
                                                             leeway=datetime.timedelta(days=3))
                if old_jwt_payload is None \
                        or old_jwt_payload.get("userId") is None \
                        or old_jwt_payload.get("userId") != jwt_payload.get("userId"):
                    raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid token or expired token.")

                return _get_current_auth_context(request=request, jwt_payload=jwt_payload)

        else:
            credentials: HTTPAuthorizationCredentials = await super(JWTAuth, self).__call__(request)
            if credentials:
                if not credentials.scheme == "Bearer":
                    raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST,
                                        detail="Invalid authentication scheme.")
                jwt_payload = authorizers.jwt_authorizer(scheme=credentials.scheme, token=credentials.credentials)
                auth_exists = jwt_payload is not None \
                              and users.auth_exists(user_id=jwt_payload.get("userId", -1),
                                                    jwt_iat=jwt_payload.get("iat", 100))
                if jwt_payload is None \
                        or jwt_payload.get("iat") is None or jwt_payload.get("aud") is None \
                        or not auth_exists:
                    if jwt_payload is not None:
                        logger.debug(jwt_payload)
                        if jwt_payload.get("iat") is None:
                            logger.debug("iat is None")
                        if jwt_payload.get("aud") is None:
                            logger.debug("aud is None")
                    if not auth_exists:
                        logger.warning("not users.auth_exists")

                    raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid token or expired token.")

                return _get_current_auth_context(request=request, jwt_payload=jwt_payload)

        logger.warning("Invalid authorization code.")
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid authorization code.")