from django.contrib.gis.db.models.functions import Distance
from django.contrib.gis.geos import Point
from django.contrib.gis.measure import D
from django.shortcuts import get_object_or_404
from drf_spectacular.utils import OpenApiParameter, extend_schema, extend_schema_view
from rest_framework import mixins, status, viewsets
from rest_framework.permissions import AllowAny, IsAuthenticated
from rest_framework.response import Response
from rest_framework.views import APIView

from apps.gooyal_oauth2.rest_framework import IsAuthenticatedOrTokenMatchesOASRequirements

from apps.core.permissions import IsStoreOwner

from .filters import StoreFilter
from .models import Store, StoreCategory, StoreWorkingHours
from .serializers import (
    SellerStoreSerializer,
    StoreCategorySerializer,
    StoreDetailSerializer,
    StoreListSerializer,
    StoreWorkingHoursSerializer,
)


class StoreCategoryViewSet(mixins.ListModelMixin, viewsets.GenericViewSet):
    schema_tags = ['Stores']
    permission_classes = [AllowAny]
    serializer_class = StoreCategorySerializer
    queryset = StoreCategory.objects.all()


@extend_schema_view(
    list=extend_schema(
        parameters=[
            OpenApiParameter('lat', float, description='Latitude; used with `lng` to sort by distance (15km radius).'),
            OpenApiParameter('lng', float, description='Longitude; used with `lat` to sort by distance (15km radius).'),
        ],
    ),
)
class StoreViewSet(mixins.ListModelMixin, mixins.RetrieveModelMixin, viewsets.GenericViewSet):
    """Customer-facing store browsing (home feed, store page)."""

    schema_tags = ['Stores']
    permission_classes = [AllowAny]
    queryset = Store.objects.filter(status=Store.Status.APPROVED).select_related('category', 'city').distinct()
    filterset_class = StoreFilter

    def get_serializer_class(self):
        if self.action == 'retrieve':
            return StoreDetailSerializer
        return StoreListSerializer

    def get_queryset(self):
        queryset = super().get_queryset()

        lat = self.request.query_params.get('lat')
        lng = self.request.query_params.get('lng')
        if lat and lng:
            point = Point(float(lng), float(lat), srid=4326)
            queryset = queryset.filter(location__distance_lte=(point, D(km=15))).annotate(
                distance=Distance('location', point)
            ).order_by('distance')

        return queryset


class SellerStoreView(APIView):
    """The authenticated seller's own store — GET/PATCH to manage it, POST to create it."""

    schema_tags = ['Seller · Store']
    serializer_class = SellerStoreSerializer
    permission_classes = [IsAuthenticatedOrTokenMatchesOASRequirements]
    required_alternate_scopes = {
        "GET": [[]],
        "POST": [[]],
        "PATCH": [[]],
    }

    def get(self, request):
        store = get_object_or_404(Store, owner=request.user)
        return Response(SellerStoreSerializer(store, context={'request': request}).data)

    def post(self, request):
        if hasattr(request.user, 'store'):
            return Response(
                {'detail': 'شما قبلاً یک فروشگاه ثبت کرده‌اید.'}, status=status.HTTP_409_CONFLICT,
            )
        serializer = SellerStoreSerializer(data=request.data, context={'request': request})
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data, status=status.HTTP_201_CREATED)

    @extend_schema(request=SellerStoreSerializer)
    def patch(self, request):
        store = get_object_or_404(Store, owner=request.user)
        serializer = SellerStoreSerializer(
            store, data=request.data, partial=True, context={'request': request},
        )
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data)


class SellerStoreWorkingHoursView(APIView):
    """Bulk get/set the authenticated seller's weekly working hours (S14)."""

    schema_tags = ['Seller · Store']
    serializer_class = StoreWorkingHoursSerializer
    # permission_classes = [IsAuthenticated, IsStoreOwner]
    # TODO:
    permission_classes = [IsAuthenticatedOrTokenMatchesOASRequirements]
    required_alternate_scopes = {
        "GET": [[]],
        "PUT": [[]],
    }

    def get(self, request):
        hours = StoreWorkingHours.objects.filter(store=request.user.store)
        return Response(StoreWorkingHoursSerializer(hours, many=True).data)

    @extend_schema(request=StoreWorkingHoursSerializer(many=True))
    def put(self, request):
        store = request.user.store
        entries = request.data if isinstance(request.data, list) else request.data.get('working_hours', [])
        serializer = StoreWorkingHoursSerializer(data=entries, many=True)
        serializer.is_valid(raise_exception=True)

        StoreWorkingHours.objects.filter(store=store).delete()
        StoreWorkingHours.objects.bulk_create(
            [StoreWorkingHours(store=store, **entry) for entry in serializer.validated_data]
        )
        return Response(StoreWorkingHoursSerializer(store.working_hours.all(), many=True).data)