"""Tag views."""
from django.conf import settings
from rest_framework import permissions
from rest_framework import viewsets, mixins, status, generics
from rest_framework.decorators import action
from rest_framework.response import Response

from tag import filters, models, serializers


class ChosenTagsView(generics.ListAPIView, viewsets.GenericViewSet):
    pagination_class = None
    permission_classes = (permissions.AllowAny,)
    serializer_class = serializers.TagBaseSerializer
    filterset_class = filters.TagsFilterSet
    queryset = models.Tag.objects.all()

    def get_queryset(self):
        result_tags_ids = models.ChosenTagSettings.objects \
            .by_country_code(self.request.country_code) \
            .values('tag_id')
        return models.Tag.objects \
            .filter(id__in=result_tags_ids) \
            .order_by_priority()


# User`s views & viewsets
class TagCategoryViewSet(mixins.ListModelMixin, viewsets.GenericViewSet):
    """ViewSet for TagCategory model."""

    filterset_class = filters.TagCategoryFilterSet
    pagination_class = None
    permission_classes = (permissions.AllowAny,)
    queryset = models.TagCategory.objects.with_tags().with_base_related(). \
        distinct()
    serializer_class = serializers.TagCategoryBaseSerializer


# BackOffice user`s views & viewsets
class BindObjectMixin:
    """Bind object mixin."""

    def get_serializer_class(self):
        if self.action == 'bind_object':
            return self.bind_object_serializer_class
        return self.serializer_class

    def perform_binding(self, serializer):
        raise NotImplemented

    def perform_unbinding(self, serializer):
        raise NotImplemented

    @action(methods=['post', 'delete'], detail=True, url_path='bind-object')
    def bind_object(self, request, pk=None):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        if request.method == 'POST':
            self.perform_binding(serializer)
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        elif request.method == 'DELETE':
            self.perform_unbinding(serializer)
            return Response(status=status.HTTP_204_NO_CONTENT)


class TagBackOfficeViewSet(mixins.ListModelMixin, mixins.CreateModelMixin,
                           mixins.UpdateModelMixin, mixins.DestroyModelMixin,
                           BindObjectMixin, viewsets.GenericViewSet):
    """List/create tag view."""

    pagination_class = None
    permission_classes = (permissions.IsAuthenticated,)
    queryset = models.Tag.objects.all()
    serializer_class = serializers.TagBackOfficeSerializer
    bind_object_serializer_class = serializers.TagBindObjectSerializer

    def perform_binding(self, serializer):
        data = serializer.validated_data
        tag = data.pop('tag')
        obj_type = data.get('type')
        related_object = data.get('related_object')
        if obj_type == self.bind_object_serializer_class.ESTABLISHMENT:
            tag.establishments.add(related_object)
        elif obj_type == self.bind_object_serializer_class.NEWS:
            tag.news.add(related_object)

    def perform_unbinding(self, serializer):
        data = serializer.validated_data
        tag = data.pop('tag')
        obj_type = data.get('type')
        related_object = data.get('related_object')
        if obj_type == self.bind_object_serializer_class.ESTABLISHMENT:
            tag.establishments.remove(related_object)
        elif obj_type == self.bind_object_serializer_class.NEWS:
            tag.news.remove(related_object)


class TagCategoryBackOfficeViewSet(mixins.CreateModelMixin,
                                   mixins.UpdateModelMixin,
                                   mixins.DestroyModelMixin,
                                   mixins.RetrieveModelMixin,
                                   BindObjectMixin,
                                   TagCategoryViewSet):
    """ViewSet for TagCategory model for BackOffice users."""

    permission_classes = (permissions.IsAuthenticated,)
    queryset = TagCategoryViewSet.queryset.with_extended_related()
    serializer_class = serializers.TagCategoryBackOfficeDetailSerializer
    bind_object_serializer_class = serializers.TagCategoryBindObjectSerializer

    def perform_binding(self, serializer):
        data = serializer.validated_data
        tag_category = data.pop('tag_category')
        obj_type = data.get('type')
        related_object = data.get('related_object')
        if obj_type == self.bind_object_serializer_class.ESTABLISHMENT_TYPE:
            tag_category.establishment_types.add(related_object)
        elif obj_type == self.bind_object_serializer_class.NEWS_TYPE:
            tag_category.news_types.add(related_object)

    def perform_unbinding(self, serializer):
        data = serializer.validated_data
        tag_category = data.pop('tag_category')
        obj_type = data.get('type')
        related_object = data.get('related_object')
        if obj_type == self.bind_object_serializer_class.ESTABLISHMENT_TYPE:
            tag_category.establishment_types.remove(related_object)
        elif obj_type == self.bind_object_serializer_class.NEWS_TYPE:
            tag_category.news_types.remove(related_object)