"""Background scheduler — runs run_check_all() every N hours.

Run as a separate process: `python -m app.scheduler`.
"""

from __future__ import annotations

import logging
import time

from apscheduler.schedulers.blocking import BlockingScheduler
from apscheduler.triggers.interval import IntervalTrigger

from app.config import settings
from app.db import init_db
from app.services.monitor import run_check_all

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s: %(message)s")
logger = logging.getLogger(__name__)


def job() -> None:
    logger.info("Scheduled scan starting…")
    start = time.time()
    summary = run_check_all()
    elapsed = time.time() - start
    total_changes = sum(c for c in summary.values() if c > 0)
    logger.info(
        "Scan done in %.1fs. Projects: %d, total changes: %d",
        elapsed, len(summary), total_changes,
    )


def main() -> None:
    init_db()
    hours = max(1, settings.scrape_interval_hours)
    scheduler = BlockingScheduler(timezone="UTC")
    scheduler.add_job(
        job,
        trigger=IntervalTrigger(hours=hours),
        # Omit next_run_time so APScheduler defaults the first run to now+interval
        # (i.e. don't fire immediately at startup, fire after one interval, then
        # every interval). Passing next_run_time=None instead creates the job in a
        # PAUSED state and it never fires — that was the bug.
        id="periodic-scan",
        max_instances=1,
        coalesce=True,
    )
    logger.info("Scheduler started — interval %d hour(s).", hours)
    try:
        scheduler.start()
    except (KeyboardInterrupt, SystemExit):
        logger.info("Scheduler stopped.")


if __name__ == "__main__":
    main()