"""Shared compact serializers for document relations."""

from rest_framework import serializers


class DepartmentBriefSerializer(serializers.Serializer):
    """Краткий сериализатор отдела."""

    id = serializers.IntegerField(read_only=True)
    name = serializers.CharField(read_only=True)


class FolderSerializer(serializers.Serializer):
    """Сериализатор для папки filer.Folder."""

    id = serializers.IntegerField(read_only=True)
    name = serializers.CharField()
    parent_id = serializers.IntegerField(
        source="parent.id", read_only=True, allow_null=True
    )
    path = serializers.SerializerMethodField()
    document_count = serializers.IntegerField(read_only=True, default=0)

    def get_path(self, obj) -> str:
        """Возвращает полный путь папки."""
        path_parts = []
        current = obj
        while current:
            path_parts.insert(0, current.name)
            current = current.parent
        return " / ".join(path_parts)


class FolderBriefSerializer(serializers.Serializer):
    """Краткий сериализатор папки для вложенного отображения."""

    id = serializers.IntegerField(read_only=True)
    name = serializers.CharField(read_only=True)