"""Location app views."""
from django.conf import settings
from django.db.transaction import on_commit
from django.shortcuts import get_object_or_404
from rest_framework import generics, permissions, status
from rest_framework.response import Response
from gallery.tasks import delete_image
from rest_framework import generics
from rest_framework import permissions
from django.db.models.expressions import RawSQL
from location import models, serializers
from utils.models import get_current_locale


# Mixins
class CountryViewMixin(generics.GenericAPIView):
    """View Mixin for model Country"""

    serializer_class = serializers.CountrySerializer
    permission_classes = (permissions.AllowAny,)
    queryset = models.Country.objects.active()


class RegionViewMixin(generics.GenericAPIView):
    """View Mixin for model Region"""
    model = models.Region
    queryset = models.Region.objects.all()


class CityViewMixin(generics.GenericAPIView):
    """View Mixin for model City"""
    model = models.City
    queryset = models.City.objects.all()


class AddressViewMixin(generics.GenericAPIView):
    """View Mixin for model Address"""
    model = models.Address
    queryset = models.Address.objects.all()


# Country
class CountryListView(CountryViewMixin, generics.ListAPIView):
    """List view for model Country."""

    pagination_class = None
    def get_queryset(self):
        qs = super().get_queryset().order_by(RawSQL("name->>%s", (get_current_locale(),)))
        return qs

class CountryRetrieveView(CountryViewMixin, generics.RetrieveAPIView):
    """Retrieve view for model Country."""


# Region
class RegionCreateView(RegionViewMixin, generics.CreateAPIView):
    """Create view for model Region"""
    serializer_class = serializers.RegionSerializer


class RegionRetrieveView(RegionViewMixin, generics.RetrieveAPIView):
    """Retrieve view for model Region"""
    serializer_class = serializers.RegionSerializer


class RegionListView(RegionViewMixin, generics.ListAPIView):
    """List view for model Country"""
    permission_classes = (permissions.AllowAny,)
    serializer_class = serializers.CountrySerializer


class WineRegionListView(generics.ListAPIView):
    """List view for model WineRegion"""
    pagination_class = None
    model = models.WineRegion
    permission_classes = (permissions.AllowAny,)
    queryset = models.WineRegion.objects.with_sub_region_related().having_wines()
    serializer_class = serializers.WineRegionSerializer


class RegionDestroyView(RegionViewMixin, generics.DestroyAPIView):
    """Destroy view for model Country"""
    serializer_class = serializers.CountrySerializer


class RegionUpdateView(RegionViewMixin, generics.UpdateAPIView):
    """Update view for model Country"""
    serializer_class = serializers.CountrySerializer


# City
class CityRUDView(generics.RetrieveUpdateDestroyAPIView):
    serializer_class = serializers.CitySerializer
    permission_classes = (permissions.AllowAny,) # TODO: remove after tests


class CityRetrieveView(CityViewMixin, generics.RetrieveAPIView):
    """Retrieve view for model City"""
    serializer_class = serializers.CitySerializer


class CityListView(CityViewMixin, generics.ListAPIView):
    """List view for model City"""
    permission_classes = (permissions.AllowAny,)
    serializer_class = serializers.CitySerializer

    def get_queryset(self):
        qs = super().get_queryset()
        if self.request.country_code:
            qs = qs.by_country_code(self.request.country_code)
        return qs


class CityDestroyView(CityViewMixin, generics.DestroyAPIView):
    """Destroy view for model City"""
    serializer_class = serializers.CitySerializer


class CityUpdateView(CityViewMixin, generics.UpdateAPIView):
    """Update view for model City"""
    serializer_class = serializers.CitySerializer


class CityGalleryListView(generics.ListAPIView):
    """Resource for returning gallery for news for back-office users."""
    serializer_class = serializers.CityImageSerializer

    permission_classes = (permissions.IsAuthenticated,)
    queryset = models.City.objects

    def get_object(self):
        """Override get_object method."""
        qs = super(CityGalleryListView, self).get_queryset()
        city = get_object_or_404(qs, pk=self.kwargs['pk'])

        # May raise a permission denied
        self.check_object_permissions(self.request, city)

        return city

    def get_queryset(self):
        """Override get_queryset method."""
        return self.get_object().gallery.all()


class CityGalleryCreateDestroyView(generics.CreateAPIView,
                                             generics.DestroyAPIView):

    permission_classes = (permissions.IsAuthenticated,)
    queryset = models.City.objects

    """Resource for a create gallery for news for back-office users."""
    serializer_class = serializers.CityGallerySerializer

    def get_object(self):
        """
        Returns the object the view is displaying.
        """
        city_qs = self.filter_queryset(self.get_queryset())

        city = get_object_or_404(city_qs, pk=self.kwargs['pk'])
        gallery = get_object_or_404(city.news_gallery, image_id=self.kwargs['image_id'])

        # May raise a permission denied
        self.check_object_permissions(self.request, gallery)

        return gallery

    def create(self, request, *args, **kwargs):
        """Overridden create method"""
        super().create(request, *args, **kwargs)
        return Response(status=status.HTTP_201_CREATED)

    def destroy(self, request, *args, **kwargs):
        """Override destroy method."""
        gallery_obj = self.get_object()
        if settings.USE_CELERY:
            on_commit(lambda: delete_image.delay(image_id=gallery_obj.image.id,
                                                 completely=False))
        else:
            on_commit(lambda: delete_image(image_id=gallery_obj.image.id,
                                           completely=False))
        # Delete an instances of NewsGallery model
        gallery_obj.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)


# Address
class AddressCreateView(AddressViewMixin, generics.CreateAPIView):
    """Create view for model Address"""
    serializer_class = serializers.AddressDetailSerializer


class AddressRetrieveView(AddressViewMixin, generics.RetrieveAPIView):
    """Retrieve view for model Address"""
    serializer_class = serializers.AddressDetailSerializer


class AddressListView(AddressViewMixin, generics.ListAPIView):
    """List view for model Address"""
    permission_classes = (permissions.AllowAny,)
    serializer_class = serializers.AddressDetailSerializer