"""
定时任务调度器
使用 APScheduler 实现定时更新汇率数据
"""
from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.interval import IntervalTrigger

from app.config import Settings
from app.services.exchange_service import ExchangeRateService
from app.utils.logger import logger


class RateScheduler:
    """汇率更新定时调度器"""
    
    def __init__(self, exchange_service: ExchangeRateService, settings: Settings):
        self.exchange_service = exchange_service
        self.settings = settings
        self.scheduler = AsyncIOScheduler()
        self._is_running = False
    
    async def _update_job(self):
        """定时更新任务"""
        logger.info("定时汇率更新开始")
        
        try:
            success = await self.exchange_service.update_cache()
            
            if success:
                cached = self.exchange_service.get_cached_rates()
                if cached:
                    logger.info(
                        f"定时汇率更新完成。"
                        f"货币数量: {len(cached.rates)}, "
                        f"数据源更新时间: {cached.last_update_utc}"
                    )
            else:
                logger.warning("定时汇率更新失败，将在下一个时间间隔重试")
                
        except Exception as e:
            logger.error(f"定时更新任务出错: {e}")
    
    async def start(self):
        """启动调度器"""
        if self._is_running:
            logger.warning("调度器已在运行中")
            return
        
        logger.info("正在启动汇率调度器...")
        
        # 立即执行一次更新
        logger.info("正在执行初始汇率获取...")
        await self._update_job()
        
        # 添加定时任务
        self.scheduler.add_job(
            self._update_job,
            trigger=IntervalTrigger(seconds=self.settings.CACHE_UPDATE_INTERVAL),
            id='rate_update',
            name='定时更新汇率',
            replace_existing=True,
            max_instances=1  # 确保同一时间只有一个任务实例运行
        )
        
        self.scheduler.start()
        self._is_running = True
        
        logger.info(
            f"调度器启动成功。"
            f"更新间隔: {self.settings.CACHE_UPDATE_INTERVAL} 秒 "
            f"({self.settings.CACHE_UPDATE_INTERVAL / 60:.1f} 分钟)"
        )
    
    def stop(self):
        """停止调度器"""
        if not self._is_running:
            logger.warning("调度器未在运行")
            return
        
        self.scheduler.shutdown(wait=False)
        self._is_running = False
        logger.info("调度器已停止")
    
    def is_running(self) -> bool:
        """检查调度器是否正在运行"""
        return self._is_running
    
    def get_next_run_time(self):
        """获取下次运行时间"""
        job = self.scheduler.get_job('rate_update')
        if job:
            return job.next_run_time
        return None