from djangorestframework import status
from djangorestframework.response import Response


class CreateModelMixin(object):
    """
    Create a model instance.
    Should be mixed in with any `APIView`
    """
    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.DATA)
        if serializer.is_valid():
            self.object = serializer.object
            self.object.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.error_data, status=status.HTTP_400_BAD_REQUEST)


class ListModelMixin(object):
    """
    List a queryset.
    Should be mixed in with `MultipleObjectBaseView`.
    """
    def list(self, request, *args, **kwargs):
        self.object_list = self.get_queryset()
        serializer = self.get_serializer(instance=self.object_list)
        return Response(serializer.data)


class RetrieveModelMixin(object):
    """
    Retrieve a model instance.
    Should be mixed in with `SingleObjectBaseView`.
    """
    def retrieve(self, request, *args, **kwargs):
        self.object = self.get_object()
        serializer = self.get_serializer(instance=self.object)
        return Response(serializer.data)


class UpdateModelMixin(object):
    """
    Update a model instance.
    Should be mixed in with `SingleObjectBaseView`.
    """
    def update(self, request, *args, **kwargs):
        self.object = self.get_object()
        serializer = self.get_serializer(data=request.DATA, instance=self.object)
        if serializer.is_valid():
            self.object = serializer.deserialized
            self.object.save()
            return Response(serializer.data)
        return Response(serializer.error_data, status=status.HTTP_400_BAD_REQUEST)


class DestroyModelMixin(object):
    """
    Destroy a model instance.
    Should be mixed in with `SingleObjectBaseView`.
    """
    def destroy(self, request, *args, **kwargs):
        self.object = self.get_object()
        self.object.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)