from django.contrib.gis.geos import Point
from drf_spectacular.utils import extend_schema_field
from rest_framework import serializers

from apps.core.media import presigned_media_url
from apps.locations.models import City, Neighborhood
from apps.locations.serializers import CitySerializer, NeighborhoodSerializer

from .models import Store, StoreBankAccount, StoreCategory, StoreWorkingHours


class StoreCategorySerializer(serializers.ModelSerializer):
    icon_url = serializers.SerializerMethodField()

    class Meta:
        model = StoreCategory
        fields = ('uuid', 'name', 'icon', 'icon_url', 'order')

    @extend_schema_field(serializers.URLField(allow_null=True))
    def get_icon_url(self, obj):
        return presigned_media_url(obj.icon)


class StoreWorkingHoursSerializer(serializers.ModelSerializer):
    class Meta:
        model = StoreWorkingHours
        fields = ('weekday', 'opens_at', 'closes_at', 'is_closed')


class StoreListSerializer(serializers.ModelSerializer):
    category = StoreCategorySerializer(read_only=True)
    logo_url = serializers.SerializerMethodField()
    cover_image_url = serializers.SerializerMethodField()

    class Meta:
        model = Store
        fields = (
            'uuid', 'name', 'category', 'logo', 'logo_url', 'cover_image', 'cover_image_url',
            'rating_avg', 'rating_count', 'min_order_amount', 'delivery_fee',
            'free_delivery_threshold', 'is_open',
        )

    @extend_schema_field(serializers.URLField(allow_null=True))
    def get_logo_url(self, obj):
        return presigned_media_url(obj.logo)

    @extend_schema_field(serializers.URLField(allow_null=True))
    def get_cover_image_url(self, obj):
        return presigned_media_url(obj.cover_image)


class StoreDetailSerializer(StoreListSerializer):
    working_hours = StoreWorkingHoursSerializer(many=True, read_only=True)

    class Meta(StoreListSerializer.Meta):
        fields = StoreListSerializer.Meta.fields + (
            'description', 'address', 'phone_number',
            'accepts_wallet', 'accepts_online', 'accepts_cash_on_delivery', 'working_hours',
        )


class TopProductSerializer(serializers.Serializer):
    name = serializers.CharField()
    units_sold = serializers.IntegerField()
    revenue = serializers.IntegerField()


class SalesChartPointSerializer(serializers.Serializer):
    bucket = serializers.DateTimeField()
    sales = serializers.IntegerField()


class SellerAnalyticsSerializer(serializers.Serializer):
    period = serializers.CharField()
    order_count = serializers.IntegerField()
    total_sales = serializers.IntegerField()
    cancellation_rate = serializers.FloatField()
    average_order_value = serializers.IntegerField()
    chart = SalesChartPointSerializer(many=True)
    top_products = TopProductSerializer(many=True)


class StoreBankAccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = StoreBankAccount
        fields = ('iban', 'account_holder_name')


class SellerStoreSerializer(serializers.ModelSerializer):
    """Read/write serializer for the authenticated seller's own store."""

    category = StoreCategorySerializer(read_only=True)
    category_uuid = serializers.PrimaryKeyRelatedField(
        source='category', queryset=StoreCategory.objects.all(), write_only=True,
    )
    city = CitySerializer(read_only=True)
    city_uuid = serializers.PrimaryKeyRelatedField(
        source='city', queryset=City.objects.filter(is_active=True), write_only=True,
    )
    service_neighborhoods = NeighborhoodSerializer(many=True, read_only=True)
    service_neighborhood_uuids = serializers.PrimaryKeyRelatedField(
        source='service_neighborhoods', queryset=Neighborhood.objects.filter(is_active=True),
        write_only=True, many=True, required=False,
    )
    latitude = serializers.FloatField(write_only=True, required=False)
    longitude = serializers.FloatField(write_only=True, required=False)
    bank_account = StoreBankAccountSerializer(read_only=True)
    logo_url = serializers.SerializerMethodField()
    cover_image_url = serializers.SerializerMethodField()

    class Meta:
        model = Store
        fields = (
            'uuid', 'name', 'category', 'category_uuid', 'description', 'logo', 'logo_url',
            'cover_image', 'cover_image_url',
            'phone_number', 'city', 'city_uuid', 'address', 'latitude', 'longitude',
            'service_neighborhoods', 'service_neighborhood_uuids', 'delivery_radius_km',
            'min_order_amount', 'delivery_fee', 'free_delivery_threshold',
            'accepts_wallet', 'accepts_online', 'accepts_cash_on_delivery',
            'rating_avg', 'rating_count', 'status', 'is_open', 'bank_account', 'created_at',
        )
        read_only_fields = ('rating_avg', 'rating_count', 'status')

    @extend_schema_field(serializers.URLField(allow_null=True))
    def get_logo_url(self, obj):
        return presigned_media_url(obj.logo)

    @extend_schema_field(serializers.URLField(allow_null=True))
    def get_cover_image_url(self, obj):
        return presigned_media_url(obj.cover_image)

    def _pop_location(self, validated_data):
        lat = validated_data.pop('latitude', None)
        lng = validated_data.pop('longitude', None)
        if lat is not None and lng is not None:
            validated_data['location'] = Point(lng, lat, srid=4326)

    def create(self, validated_data):
        self._pop_location(validated_data)
        validated_data['owner'] = self.context['request'].user
        return super().create(validated_data)

    def update(self, instance, validated_data):
        self._pop_location(validated_data)
        return super().update(instance, validated_data)