from rest_framework.authentication import SessionAuthentication, BasicAuthentication
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.decorators import api_view, authentication_classes, permission_classes

# ----------Autentificacion por token ---------------
from rest_framework.authtoken.models import Token
from rest_framework.authtoken.views import ObtainAuthToken
from rest_framework.response import Response

# ----------Custom Authentication--------------
from django.contrib.auth.models import User, Group
from rest_framework import authentication
from rest_framework import exceptions


# Create your views here.

'''
HTTP 401 No autorizado
HTTP 403 Permiso denegado
'''


class TestAuthView0(APIView):

    authentication_classes = [SessionAuthentication, BasicAuthentication]
    permission_classes = [IsAuthenticated]

    def get(self, request, format=None):
        content = {
            'user': str(request.user),  # `django.contrib.auth.User` instance.
            'auth': str(request.auth),  # None
        }
        return Response(content)


@api_view(['GET'])
@authentication_classes([SessionAuthentication, BasicAuthentication])
@permission_classes([IsAuthenticated])
def TestAuthView(request, format=None):

    content = {
        'user': str(request.user),  # `django.contrib.auth.User` instance.
        'auth': str(request.auth),  # None
    }
    return Response(content)


class CustomAuthToken(ObtainAuthToken):

    def post(self, request, *args, **kwargs):
        serializer = self.serializer_class(data=request.data,
                                           context={'request': request})
        serializer.is_valid(raise_exception=True)
        user = serializer.validated_data['user']
        token, created = Token.objects.get_or_create(user=user)
        return Response({
            'token': token.key,
            'user_id': user.pk,
            'email': user.email
        })


class ExampleAuthentication(authentication.BaseAuthentication):
    def authenticate(self, request):
        username = request.META.get('HTTP_X_USERNAME')
        if not username:
            return None

        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            raise exceptions.AuthenticationFailed('No such user')

        return (user, None)