from django.core.exceptions import ObjectDoesNotExist
from django.db.models import Model
from django.shortcuts import render
from rest_framework import viewsets, status
from rest_framework.exceptions import ValidationError
from rest_framework.generics import RetrieveUpdateDestroyAPIView, get_object_or_404
from rest_framework.response import Response
from rest_framework.views import APIView
from django.contrib.auth.models import User

from apps.patient.models import Patient
from apps.patient.serializers import PatientSerializer


class PatientViewSet(viewsets.ModelViewSet):

    def get_queryset(self):
        user = self.request.user
        return Patient.objects.filter(owners=user)
    # queryset = Patient.objects.all().order_by('-created_date')

    # def get_object(self):
    #     queryset = self.get_queryset()
    #     filter = {}
    #     for field in self.multiple_lookup_fields:
    #         filter[field] = self.kwargs[field]
    #
    #     obj = get_object_or_404(queryset, **filter)
    #     self.check_object_permissions(self.request, obj)
    #     return obj

    serializer_class = PatientSerializer


# class PatientVS(RetrieveUpdateDestroyAPIView):
#
#     def get_queryset(self):
#         user = self.request.user
#
#     def get(self, request, *args, **kwargs):
#         user = request.user
#         patients = Patient.objects.filter(owners=user)
#         return patients


class AddUserForPatient(APIView):

    def post(self, request):
        patient_id = request.data["patient_id"]
        username = request.data["username"]
        try:
            patient = Patient.objects.get(pk=patient_id)
        except ObjectDoesNotExist:
            raise ValidationError(detail="incorrect patient_id",
                                  code=status.HTTP_404_NOT_FOUND)
        try:
            user = User.objects.get(username=username)
        except ObjectDoesNotExist:
            raise ValidationError(detail="user not found",
                                  code=status.HTTP_404_NOT_FOUND)
        if request.user in patient.owners.all():
            result = patient.owners.all()
            list_result = [entry for entry in result]
            list_result.append(user)
            patient.owners.set(set(list_result))
            patient.save()
            serializer_context = {
                'request': request,
            }
            serializer = PatientSerializer(patient, context=serializer_context)
            return Response(serializer.data)
        else:
            raise ValidationError(detail="FORBIDDEN",
                                  code=status.HTTP_403_FORBIDDEN)