"""Worker 入口:启动调度器 + 异步任务。

`docker compose exec worker python -m app.workers`
"""
from __future__ import annotations

import asyncio
import logging
import signal
from datetime import datetime, timezone

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.cron import CronTrigger
from apscheduler.triggers.interval import IntervalTrigger
from sqlalchemy import select

from app.config import settings
from app.database import AsyncSessionLocal
from app.models.source import Source
from app.workers.pipeline import fetch_one_source, run_once

logger = logging.getLogger("news.worker")
logging.basicConfig(
    level=settings.log_level,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)


async def _rebuild_jobs(scheduler: AsyncIOScheduler) -> None:
    """从 sources 表动态构建 job(可热更新)。"""
    scheduler.remove_all_jobs()
    async with AsyncSessionLocal() as s:
        rows = (await s.execute(select(Source).where(Source.enabled.is_(True)))).scalars()
        sources = list(rows)
    if not sources:
        logger.warning("no enabled sources; scheduler idle")
        return
    for src in sources:
        trigger = (
            CronTrigger.from_crontab(src.fetch_cron)
            if src.fetch_cron
            else IntervalTrigger(minutes=src.fetch_interval_min)
        )
        scheduler.add_job(
            fetch_one_source,
            trigger=trigger,
            args=[src.id],
            id=f"src:{src.slug}",
            replace_existing=True,
            max_instances=1,
            coalesce=True,
            misfire_grace_time=300,
        )
        logger.info("scheduled %s every %s", src.slug, src.fetch_cron or f"{src.fetch_interval_min}m")


async def _daily_rebuild() -> None:
    """每天 00:30 重建 job 列表(支持运行时新增源)。"""
    scheduler = AsyncIOScheduler()
    # 临时实例,只为重建用
    # 实际用全局 scheduler 实例
    pass


def build_scheduler() -> AsyncIOScheduler:
    sched = AsyncIOScheduler(timezone="Asia/Hong_Kong")
    return sched


async def main() -> None:
    scheduler = build_scheduler()
    await _rebuild_jobs(scheduler)
    # 每天 00:30 重建一次
    scheduler.add_job(
        _rebuild_jobs,
        trigger=CronTrigger(hour=0, minute=30),
        args=[scheduler],
        id="rebuild_jobs",
        replace_existing=True,
    )
    # 启动时立即跑一次
    scheduler.add_job(
        run_once,
        trigger=IntervalTrigger(minutes=0),
        id="startup_run",
        next_run_time=datetime.now(timezone.utc),
    )

    scheduler.start()
    logger.info("scheduler started with %d jobs", len(scheduler.get_jobs()))

    stop = asyncio.Event()

    def _signal_handler():
        logger.info("shutdown signal received")
        stop.set()

    loop = asyncio.get_running_loop()
    for sig in (signal.SIGINT, signal.SIGTERM):
        try:
            loop.add_signal_handler(sig, _signal_handler)
        except NotImplementedError:
            # Windows 等不支持
            pass

    await stop.wait()
    logger.info("stopping scheduler")
    scheduler.shutdown(wait=False)


if __name__ == "__main__":
    asyncio.run(main())