from rest_framework import serializers
from .models import Bookmark


class BookmarkSerializer(serializers.ModelSerializer):
    """
    Serializer for the Bookmark model.
    """
    
    class Meta:
        model = Bookmark
        fields = ['id', 'user', 'service', 'content_id', 'status', 'created_at', 'updated_at']
        read_only_fields = ['id', 'created_at', 'updated_at', 'status']
    
    def validate(self, data):
        """
        Validate that the content_id exists in the specified service.
        """
        service = data.get('service')
        content_id = data.get('content_id')
        
        if not Bookmark.validate_content_exists(service, content_id):
            raise serializers.ValidationError(
                f"Content does not exist in service."
            )
        
        return data


class BookmarkStatusSerializer(serializers.Serializer):
    """
    Serializer for bookmark status information.
    This can be used as a SerializerMethodField in other serializers.
    """
    is_bookmarked = serializers.BooleanField(default=False)
    content_id = serializers.IntegerField()
    
    
    bookmark_info = BookmarkSerializer(read_only=True)
    
    @staticmethod
    def get_bookmark_info(obj, user, service):
        """
        Get bookmark information for a specific object.
        
        Args:
            obj: The object being serialized
            user: The user to check bookmark status for
            service: The service name (library, podcast, hadith, video)
            
        Returns:
            Dictionary with is_bookmarked and content_id
        """
        if not user or user.is_anonymous:
            return {
                'is_bookmarked': False,
                'content_id': getattr(obj, 'id', None)
            }
        
        content_id = getattr(obj, 'id', None)
        if content_id is None:
            return {
                'is_bookmarked': False,
                'content_id': None
            }
        
        is_bookmarked = Bookmark.is_bookmarked(
            user=user,
            service=service,
            content_id=content_id
        )
        
        return {
            'is_bookmarked': is_bookmarked,
            'content_id': content_id
        }