from rest_framework import permissions, status
from rest_framework.response import Response
from rest_framework.views import APIView

from apps.notifications.models import EmailConfig
from apps.notifications.serializers import EmailConfigSerializer


class AdminEmailConfigListCreateView(APIView):
    permission_classes = [permissions.IsAdminUser]

    def get(self, request):
        queryset = EmailConfig.objects.filter(is_active=True).order_by('-is_primary', '-updated_at')
        serializer = EmailConfigSerializer(queryset, many=True)
        return Response({'results': serializer.data, 'count': queryset.count()}, status=status.HTTP_200_OK)

    def post(self, request):
        serializer = EmailConfigSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        config = serializer.save()
        return Response({'success': True, 'data': EmailConfigSerializer(config).data}, status=status.HTTP_201_CREATED)


class AdminEmailConfigDetailView(APIView):
    permission_classes = [permissions.IsAdminUser]

    def get_object(self, config_id):
        return EmailConfig.objects.filter(id=config_id, is_active=True).first()

    def get(self, request, config_id):
        instance = self.get_object(config_id)
        if not instance:
            return Response({'detail': 'Not found'}, status=status.HTTP_404_NOT_FOUND)
        return Response({'data': EmailConfigSerializer(instance).data}, status=status.HTTP_200_OK)

    def patch(self, request, config_id):
        instance = self.get_object(config_id)
        if not instance:
            return Response({'detail': 'Not found'}, status=status.HTTP_404_NOT_FOUND)

        serializer = EmailConfigSerializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        updated = serializer.save()
        return Response({'success': True, 'data': EmailConfigSerializer(updated).data}, status=status.HTTP_200_OK)

    def delete(self, request, config_id):
        instance = self.get_object(config_id)
        if not instance:
            return Response({'detail': 'Not found'}, status=status.HTTP_404_NOT_FOUND)

        if instance.is_primary:
            return Response({'detail': 'Primary email config cannot be deleted. Activate another config first.'}, status=status.HTTP_400_BAD_REQUEST)

        instance.is_active = False
        instance.save(update_fields=['is_active', 'updated_at'])
        return Response(status=status.HTTP_204_NO_CONTENT)


class AdminEmailConfigActivateView(APIView):
    permission_classes = [permissions.IsAdminUser]

    def post(self, request, config_id):
        instance = EmailConfig.objects.filter(id=config_id, is_active=True).first()
        if not instance:
            return Response({'detail': 'Not found'}, status=status.HTTP_404_NOT_FOUND)

        EmailConfig.objects.filter(is_active=True).exclude(id=instance.id).update(is_primary=False)
        instance.is_primary = True
        instance.save(update_fields=['is_primary', 'updated_at'])
        return Response({'success': True, 'data': EmailConfigSerializer(instance).data}, status=status.HTTP_200_OK)