from sqlalchemy import select

from app.db.base import SessionLocal
from app.db.models import ChatSession, Message


def post_chat_notice(content: str) -> None:
    db = SessionLocal()
    try:
        session = db.scalar(
            select(ChatSession).order_by(ChatSession.updated_at.desc()).limit(1)
        )
        if not session:
            session = ChatSession(title="Уведомления")
            db.add(session)
            db.commit()
            db.refresh(session)
        db.add(Message(session_id=session.id, role="notice", content=content))
        db.commit()
    finally:
        db.close()