import logging

from django.http import JsonResponse

from rest_framework.decorators import api_view
from py_jwt_validator import PyJwtValidator, PyJwtException

logger = logging.getLogger(__name__)


def authorize(request):
    logger.debug('Validating request: {}'.format(request))

    if 'Authorization' not in request.headers:
        print(f"Authorization header missing")
        logger.error(f"Authorization header missing")
        return None

    bearer = request.headers['Authorization']

    if len(bearer.split()) < 2:
        return None

    jwt = bearer.split()[1]

    try:
        validator = PyJwtValidator(jwt, auto_verify=False)
        token = validator.verify(True)
        if 'payload' in token:
            payload = token['payload']
            if 'sub' in payload:
                return payload['sub']
    except PyJwtException as e:
        print(f"Exception caught. Error: {e}")
        logger.error(f"Exception caught. Error: {e}")
        return None
    except UnicodeDecodeError as e2:
        print(f"Exception caught. Error: {e2}")
        logger.error(f"Exception caught. Error: {e2}")
        return None
    return None


class LoginClass:
    @staticmethod
    @api_view(['GET'])
    def login(request):
        user_sub = authorize(request)
        if not user_sub:
            return JsonResponse({}, status=401)

        return JsonResponse({'user': user_sub}, safe=False, status=200)