from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.executors.pool import ThreadPoolExecutor
from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore
from apscheduler.events import EVENT_JOB_EXECUTED, EVENT_JOB_ERROR
import logging
from ..core.config import settings

# 配置日志
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class TaskScheduler:
    def __init__(self):
        # 配置作业存储
        jobstores = {
            'default': SQLAlchemyJobStore(url=settings.DATABASE_URL)
        }

        # 配置执行器
        executors = {
            'default': ThreadPoolExecutor(20)
        }

        # 作业默认配置
        job_defaults = {
            'coalesce': False,
            'max_instances': 3
        }

        # 创建调度器
        self.scheduler = BackgroundScheduler(
            jobstores=jobstores,
            executors=executors,
            job_defaults=job_defaults,
            timezone='Asia/Shanghai'
        )

        # 添加事件监听器
        self.scheduler.add_listener(self._job_listener, EVENT_JOB_EXECUTED | EVENT_JOB_ERROR)

    def _job_listener(self, event):
        """作业执行监听器"""
        if event.exception:
            logger.error(f"Job {event.job_id} crashed: {event.exception}")
        else:
            logger.info(f"Job {event.job_id} executed successfully")

    def start(self):
        """启动调度器"""
        if not self.scheduler.running:
            self.scheduler.start()
            logger.info("定时任务调度器已启动")

    def shutdown(self):
        """关闭调度器"""
        if self.scheduler.running:
            self.scheduler.shutdown()
            logger.info("定时任务调度器已关闭")

    def add_cron_job(self, func, job_id: str, **kwargs):
        """添加cron定时任务"""
        return self.scheduler.add_job(func, 'cron', id=job_id, **kwargs)

    def add_interval_job(self, func, job_id: str, **kwargs):
        """添加间隔执行任务"""
        return self.scheduler.add_job(func, 'interval', id=job_id, **kwargs)

    def add_date_job(self, func, job_id: str, **kwargs):
        """添加指定时间执行任务"""
        return self.scheduler.add_job(func, 'date', id=job_id, **kwargs)

    def remove_job(self, job_id: str):
        """移除任务"""
        try:
            self.scheduler.remove_job(job_id)
            logger.info(f"任务 {job_id} 已移除")
            return True
        except Exception as e:
            logger.error(f"移除任务失败: {e}")
            return False

    def get_job(self, job_id: str):
        """获取任务"""
        return self.scheduler.get_job(job_id)

    def get_jobs(self):
        """获取所有任务"""
        return self.scheduler.get_jobs()

    def pause_job(self, job_id: str):
        """暂停任务"""
        try:
            self.scheduler.pause_job(job_id)
            logger.info(f"任务 {job_id} 已暂停")
            return True
        except Exception as e:
            logger.error(f"暂停任务失败: {e}")
            return False

    def resume_job(self, job_id: str):
        """恢复任务"""
        try:
            self.scheduler.resume_job(job_id)
            logger.info(f"任务 {job_id} 已恢复")
            return True
        except Exception as e:
            logger.error(f"恢复任务失败: {e}")
            return False

# 全局调度器实例
task_scheduler = TaskScheduler()

# 示例定时任务函数
def example_task():
    """示例定时任务"""
    logger.info("执行示例定时任务")
    # 这里可以添加具体的业务逻辑
    return "任务执行完成"

def database_cleanup_task():
    """数据库清理任务示例"""
    logger.info("执行数据库清理任务")
    # 这里可以添加数据库清理逻辑
    return "数据库清理完成"