from typing import Optional
from datetime import datetime
from zoneinfo import ZoneInfo

from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.cron import CronTrigger

from scheduler.decode_dispatch_job import run_decode_dispatch_job
from utils.scheduler_logger import get_scheduler_logger


logger = get_scheduler_logger()
_scheduler: Optional[BackgroundScheduler] = None


def start_scheduler() -> None:
    global _scheduler
    if _scheduler and _scheduler.running:
        logger.info("调度器已在运行，跳过重复启动")
        return

    _scheduler = BackgroundScheduler(timezone=ZoneInfo("Asia/Shanghai"))
    _scheduler.add_job(
        run_decode_dispatch_job,
        trigger=CronTrigger(minute="*/3"),
        id="decode_dispatch_every_3min",
        replace_existing=True,
        next_run_time=datetime.now(ZoneInfo("Asia/Shanghai")),
    )
    _scheduler.start()
    logger.info("调度器已启动：立即触发一次，之后每3分钟执行一次")


def stop_scheduler() -> None:
    global _scheduler
    if _scheduler and _scheduler.running:
        _scheduler.shutdown(wait=False)
        logger.info("调度器已停止")
    _scheduler = None


def run_dispatch_once() -> None:
    logger.info("手动触发执行一次调度任务")
    run_decode_dispatch_job()