"""Hintergrund-Scheduler: führt den Sync automatisch nach Zeitplan aus."""
from __future__ import annotations

import logging

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.cron import CronTrigger

from .config import settings
from .sync import run_sync

logger = logging.getLogger("phpipam_outline_sync.scheduler")

scheduler = AsyncIOScheduler()
JOB_ID = "phpipam-outline-sync"


def _run_scheduled_sync() -> None:
    """Wird vom Scheduler aufgerufen (läuft in einem Thread, blockiert den
    Event-Loop also nicht)."""
    try:
        results = run_sync()
        created = sum(1 for r in results if r.get("action") == "created")
        updated = sum(1 for r in results if r.get("action") == "updated")
        logger.info(
            "Geplanter Sync abgeschlossen: %d Subnetze (%d neu, %d aktualisiert)",
            len(results),
            created,
            updated,
        )
    except Exception:  # noqa: BLE001
        logger.exception("Geplanter Sync fehlgeschlagen")


def start_scheduler() -> None:
    if not settings.sync_schedule_enabled:
        logger.info("Scheduler deaktiviert (SYNC_SCHEDULE_ENABLED=false)")
        return
    trigger = CronTrigger.from_crontab(settings.sync_schedule_cron)
    scheduler.add_job(
        _run_scheduled_sync,
        trigger=trigger,
        id=JOB_ID,
        replace_existing=True,
        max_instances=1,
        coalesce=True,
    )
    scheduler.start()
    logger.info("Scheduler gestartet, Zeitplan: '%s'", settings.sync_schedule_cron)


def stop_scheduler() -> None:
    if scheduler.running:
        scheduler.shutdown(wait=False)