"""
Доменная сущность Conversation
"""
from datetime import datetime
from uuid import UUID, uuid4


class Conversation:
    """Беседа пользователя с ИИ"""
    
    def __init__(
        self,
        user_id: UUID,
        collection_id: UUID,
        conversation_id: UUID | None = None,
        created_at: datetime | None = None,
        updated_at: datetime | None = None
    ):
        self.conversation_id = conversation_id or uuid4()
        self.user_id = user_id
        self.collection_id = collection_id
        self.created_at = created_at or datetime.utcnow()
        self.updated_at = updated_at or datetime.utcnow()
    
    def update_timestamp(self):
        """Обновить время последнего изменения"""
        self.updated_at = datetime.utcnow()