from rest_framework import serializers
from .models import ApiCategory, ApiItem, ApiFavorite


class ApiCategorySerializer(serializers.ModelSerializer):
    item_count = serializers.SerializerMethodField()

    class Meta:
        model = ApiCategory
        fields = ['id', 'name', 'icon', 'sort_order', 'item_count', 'created_at']
        read_only_fields = ['id', 'created_at']

    def get_item_count(self, obj):
        return obj.items.filter(is_enabled=True).count()


class ApiItemSerializer(serializers.ModelSerializer):
    category_name = serializers.CharField(source='category.name', read_only=True, default='')
    favorites_count = serializers.SerializerMethodField()
    is_favorited = serializers.SerializerMethodField()

    class Meta:
        model = ApiItem
        fields = [
            'id', 'name', 'description', 'icon', 'url_path', 'method',
            'category', 'category_name', 'is_enabled', 'is_new', 'is_coming_soon',
            'views_count', 'color', 'image_url', 'sort_order', 'created_at', 'updated_at',
            'favorites_count', 'is_favorited'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def get_favorites_count(self, obj):
        return obj.favorites.count()

    def get_is_favorited(self, obj):
        request = self.context.get('request')
        if request and request.user.is_authenticated:
            return obj.favorites.filter(user=request.user).exists()
        return False


class ApiFavoriteSerializer(serializers.ModelSerializer):
    api_item_name = serializers.CharField(source='api_item.name', read_only=True)
    api_item_url = serializers.CharField(source='api_item.url_path', read_only=True)

    class Meta:
        model = ApiFavorite
        fields = ['id', 'user', 'api_item', 'api_item_name', 'api_item_url', 'created_at']
        read_only_fields = ['id', 'created_at']