from drf_spectacular.utils import extend_schema_field
from rest_framework import serializers

from apps.core.media import presigned_media_url
from apps.stores.serializers import StoreListSerializer

from .models import Product, ProductCategory


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

    class Meta:
        model = ProductCategory
        fields = ('uuid', 'name', 'parent', '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 ProductListSerializer(serializers.ModelSerializer):
    is_out_of_stock = serializers.BooleanField(read_only=True)
    image_url = serializers.SerializerMethodField()

    class Meta:
        model = Product
        fields = (
            'uuid', 'name', 'image', 'image_url', 'price', 'unit_type', 'unit_value',
            'is_active', 'is_out_of_stock',
        )

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


class ProductDetailSerializer(ProductListSerializer):
    category = ProductCategorySerializer(read_only=True)
    store = StoreListSerializer(read_only=True)

    class Meta(ProductListSerializer.Meta):
        fields = ProductListSerializer.Meta.fields + ('description', 'category', 'store')


class SellerProductSerializer(serializers.ModelSerializer):
    """Read/write serializer for the seller's own products (S06/S07/S08)."""

    category = ProductCategorySerializer(read_only=True)
    category_uuid = serializers.PrimaryKeyRelatedField(
        source='category', queryset=ProductCategory.objects.all(), write_only=True,
    )
    is_out_of_stock = serializers.BooleanField(read_only=True)
    is_low_stock = serializers.BooleanField(read_only=True)
    image_url = serializers.SerializerMethodField()

    class Meta:
        model = Product
        fields = (
            'uuid', 'name', 'description', 'image', 'image_url', 'category', 'category_uuid',
            'price', 'unit_type', 'unit_value', 'stock_quantity', 'low_stock_threshold',
            'is_active', 'sold_count', 'is_out_of_stock', 'is_low_stock', 'created_at',
        )
        read_only_fields = ('sold_count',)

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

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


class StockAdjustSerializer(serializers.Serializer):
    stock_quantity = serializers.IntegerField(min_value=0)