"""Establishment app views."""
from django.conf import settings
from django.contrib.gis.geos import Point
from django.shortcuts import get_object_or_404
from rest_framework import generics, permissions

from comment import models as comment_models
from establishment import filters
from establishment import models, serializers
from main import methods
from main.models import MetaDataContent
from utils.pagination import EstablishmentPortionPagination


class EstablishmentMixinView:
    """Establishment mixin."""

    permission_classes = (permissions.AllowAny,)

    def get_queryset(self):
        """Overridden method 'get_queryset'."""
        return models.Establishment.objects.published() \
                                           .with_base_related() \
                                           .annotate_in_favorites(self.request.user)


class EstablishmentListView(EstablishmentMixinView, generics.ListAPIView):
    """Resource for getting a list of establishments."""

    filter_class = filters.EstablishmentFilter
    serializer_class = serializers.EstablishmentBaseSerializer

    def get_queryset(self):
        """Overridden method 'get_queryset'."""
        qs = super(EstablishmentListView, self).get_queryset()
        if self.request.country_code:
            qs = qs.by_country_code(self.request.country_code)
        return qs


class EstablishmentRetrieveView(EstablishmentMixinView, generics.RetrieveAPIView):
    """Resource for getting a establishment."""

    lookup_field = 'slug'
    serializer_class = serializers.EstablishmentDetailSerializer

    def get_queryset(self):
        return super().get_queryset().with_extended_related()


class EstablishmentRecentReviewListView(EstablishmentListView):
    """List view for last reviewed establishments."""

    pagination_class = EstablishmentPortionPagination

    def get_queryset(self):
        """Overridden method 'get_queryset'."""
        qs = super().get_queryset()
        user_ip = methods.get_user_ip(self.request)
        query_params = self.request.query_params
        if 'longitude' in query_params and 'latitude' in query_params:
            longitude, latitude = query_params.get('longitude'), query_params.get('latitude')
        else:
            longitude, latitude = methods.determine_coordinates(user_ip)
        if not longitude or not latitude:
            return qs.none()
        point = Point(x=float(longitude), y=float(latitude), srid=settings.GEO_DEFAULT_SRID)
        return qs.last_reviewed(point=point)


class EstablishmentSimilarListView(EstablishmentListView):
    """Resource for getting a list of establishments."""

    serializer_class = serializers.EstablishmentBaseSerializer
    pagination_class = EstablishmentPortionPagination

    def get_queryset(self):
        """Override get_queryset method"""
        qs = super().get_queryset()
        return qs.similar(establishment_slug=self.kwargs.get('slug'))


class EstablishmentTypeListView(generics.ListAPIView):
    """Resource for getting a list of establishment types."""

    permission_classes = (permissions.AllowAny,)
    serializer_class = serializers.EstablishmentTypeSerializer
    queryset = models.EstablishmentType.objects.all()


class EstablishmentCommentCreateView(generics.CreateAPIView):
    """View for create new comment."""
    lookup_field = 'slug'
    serializer_class = serializers.EstablishmentCommentCreateSerializer
    queryset = comment_models.Comment.objects.all()


class EstablishmentCommentListView(generics.ListAPIView):
    """View for return list of establishment comments."""

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

    def get_queryset(self):
        """Override get_queryset method"""

        establishment = get_object_or_404(models.Establishment, slug=self.kwargs['slug'])
        return comment_models.Comment.objects.by_content_type(app_label='establishment',
                                                              model='establishment')\
                                             .by_object_id(object_id=establishment.pk)\
                                             .order_by('-created')


class EstablishmentCommentRUDView(generics.RetrieveUpdateDestroyAPIView):
    """View for retrieve/update/destroy establishment comment."""
    serializer_class = serializers.EstablishmentCommentRUDSerializer
    queryset = models.Establishment.objects.all()

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

        establishment_obj = get_object_or_404(queryset,
                                              slug=self.kwargs['slug'])
        comment_obj = get_object_or_404(establishment_obj.comments.by_user(self.request.user),
                                        pk=self.kwargs['comment_id'])

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

        return comment_obj


class EstablishmentFavoritesCreateDestroyView(generics.CreateAPIView, generics.DestroyAPIView):
    """View for create/destroy establishment from favorites."""
    serializer_class = serializers.EstablishmentFavoritesCreateSerializer
    lookup_field = 'slug'

    def get_object(self):
        """
        Returns the object the view is displaying.
        """
        establishment_obj = get_object_or_404(models.Establishment,
                                              slug=self.kwargs['slug'])
        obj = get_object_or_404(
            self.request.user.favorites.by_content_type(app_label='establishment',
                                                        model='establishment')
                                       .by_object_id(object_id=establishment_obj.pk))
        # May raise a permission denied
        self.check_object_permissions(self.request, obj)
        return obj


class EstablishmentNearestRetrieveView(EstablishmentListView, generics.ListAPIView):
    """Resource for getting list of nearest establishments."""

    serializer_class = serializers.EstablishmentBaseSerializer
    filter_class = filters.EstablishmentFilter

    def get_queryset(self):
        """Overridden method 'get_queryset'."""
        # todo: latitude and longitude
        lat = self.request.query_params.get('lat')
        lon = self.request.query_params.get('lon')
        radius = self.request.query_params.get('radius')
        unit = self.request.query_params.get('unit')

        qs = super(EstablishmentNearestRetrieveView, self).get_queryset()
        if lat and lon and radius and unit:
            center = Point(float(lat), float(lon))
            filter_kwargs = {'center': center, 'radius': float(radius), 'unit': unit}
            return qs.by_distance_from_point(**{k: v for k, v in filter_kwargs.items()
                                                if v is not None})
        return qs


class EstablishmentTagListView(generics.ListAPIView):
    """List view for establishment tags."""
    serializer_class = serializers.EstablishmentTagListSerializer
    permission_classes = (permissions.AllowAny,)
    pagination_class = None

    def get_queryset(self):
        """Override get_queryset method"""
        return MetaDataContent.objects.by_content_type(app_label='establishment',
                                                       model='establishment')\
                                      .distinct('metadata__label')