"""News app views."""
from django.shortcuts import get_object_or_404
from rest_framework import generics, permissions
from news import filters, models, serializers
from rating.tasks import add_rating
from utils.permissions import IsCountryAdmin, IsContentPageManager


class NewsMixinView:
    """News mixin."""

    permission_classes = (permissions.AllowAny, )
    serializer_class = serializers.NewsBaseSerializer

    def get_queryset(self, *args, **kwargs):
        """Override get_queryset method."""
        qs = models.News.objects.published().with_base_related()\
            .order_by('-is_highlighted', '-created')
        if self.request.country_code:
            qs = qs.by_country_code(self.request.country_code)
        return qs


class NewsListView(NewsMixinView, generics.ListAPIView):
    """News list view."""

    filter_class = filters.NewsListFilterSet


class NewsDetailView(NewsMixinView, generics.RetrieveAPIView):
    """News detail view."""

    lookup_field = 'slug'
    serializer_class = serializers.NewsDetailWebSerializer

    def get_queryset(self):
        """Override get_queryset method."""
        return super().get_queryset().with_extended_related()


class NewsTypeListView(generics.ListAPIView):
    """NewsType list view."""

    pagination_class = None
    permission_classes = (permissions.AllowAny, )
    queryset = models.NewsType.objects.all()
    serializer_class = serializers.NewsTypeSerializer


class NewsBackOfficeMixinView:
    """News back office mixin view."""

    permission_classes = (permissions.IsAuthenticated,)
    queryset = models.News.objects.with_base_related() \
        .order_by('-is_highlighted', '-created')


class NewsBackOfficeLCView(NewsBackOfficeMixinView,
                           generics.ListCreateAPIView):
    """Resource for a list of news for back-office users."""

    serializer_class = serializers.NewsBackOfficeBaseSerializer
    create_serializers_class = serializers.NewsBackOfficeDetailSerializer
    permission_classes = [IsCountryAdmin|IsContentPageManager]

    def get_serializer_class(self):
        """Override serializer class."""
        if self.request.method == 'POST':
            return self.create_serializers_class
        return super().get_serializer_class()

    def get_queryset(self):
        """Override get_queryset method."""
        return super().get_queryset().with_extended_related()


class NewsBackOfficeRUDView(NewsBackOfficeMixinView,
                            generics.RetrieveUpdateDestroyAPIView):
    """Resource for detailed information about news for back-office users."""

    serializer_class = serializers.NewsBackOfficeDetailSerializer
    permission_classes = [IsCountryAdmin|IsContentPageManager]

    def get(self, request, pk, *args, **kwargs):
        add_rating(remote_addr=request.META.get('REMOTE_ADDR'),
                   pk=pk, model='news', app_label='news')
        return self.retrieve(request, *args, **kwargs)