"""Telegram service utilities — chat persistence helpers."""

from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession

from ..database.models import TelegramChat


async def save_chat_from_webhook(
    session: AsyncSession, bot_id: int, chat_data: dict,
    language_code: str = "",
) -> None:
    """Save or update a chat entry from an incoming webhook message.

    Called by the webhook handler to auto-persist chats.
    """
    chat_id = str(chat_data.get("id", ""))
    if not chat_id:
        return

    result = await session.exec(
        select(TelegramChat).where(
            TelegramChat.bot_id == bot_id,
            TelegramChat.chat_id == chat_id,
        )
    )
    existing = result.first()

    title = chat_data.get("title") or (
        chat_data.get("first_name", "") + (" " + chat_data.get("last_name", "")).strip()
    )

    if existing:
        existing.title = title
        existing.username = chat_data.get("username", existing.username)
        if language_code:
            existing.language_code = language_code
        session.add(existing)
    else:
        session.add(TelegramChat(
            bot_id=bot_id,
            chat_id=chat_id,
            title=title,
            chat_type=chat_data.get("type", "private"),
            username=chat_data.get("username", ""),
            language_code=language_code,
        ))