"""Entry point: settings → texts → dispatcher → long polling (ADR-002)."""

import asyncio
import contextlib
import logging

from aiogram import Bot, Dispatcher

from app import __version__
from app.bot.fsm import make_storage
from app.bot.middlewares.access import AccessMiddleware
from app.bot.routers.common import build_router
from app.config import Settings
from app.db.maintenance import cleanup_loop
from app.db.migrate import upgrade
from app.db.session import SessionMaker, make_engine, make_sessionmaker
from app.health import heartbeat
from app.logs_setup import setup_logging
from app.texts import Texts, load_texts

log = logging.getLogger("tgit")


def build_dispatcher(settings: Settings, texts: Texts, sessions: SessionMaker) -> Dispatcher:
    admin_ids = settings.access.admin_ids

    async def is_member(tg_id: int) -> bool:
        return tg_id in admin_ids

    dp = Dispatcher(storage=make_storage(sessions))
    access = AccessMiddleware(is_member, texts)
    # Outer middleware: runs before filters, so nothing — not even a stale button — reaches a handler unchecked.
    dp.message.outer_middleware(access)
    dp.callback_query.outer_middleware(access)
    dp.include_router(build_router(texts, admin_ids))
    return dp


async def run(settings: Settings) -> None:
    texts = load_texts(settings.runtime.config_dir)
    engine = make_engine(settings.database.url)
    await upgrade(engine)
    sessions = make_sessionmaker(engine)
    dp = build_dispatcher(settings, texts, sessions)
    rt = settings.runtime
    background = [
        asyncio.create_task(heartbeat(rt.heartbeat_file, rt.heartbeat_interval)),
        asyncio.create_task(cleanup_loop(sessions)),
    ]
    bot = Bot(settings.telegram.bot_token.get_secret_value())
    log.info("tgit %s starting, %d bootstrap admin(s)", __version__, len(settings.access.admin_ids))
    try:
        await dp.start_polling(bot, handle_signals=True)
    finally:
        for task in background:
            task.cancel()
        for task in background:
            with contextlib.suppress(asyncio.CancelledError):
                await task
        await bot.session.close()
        await engine.dispose()
        log.info("tgit stopped")


def main() -> None:
    settings = Settings()
    setup_logging(settings.runtime.log_level)
    asyncio.run(run(settings))