const node_schedule = require("node-schedule");
const logs = require('../tool/logs_proxy');

class Schedule {
  // 执行标记，防止并发执行
  constructor() {
    this.running_flags = {
     
    };
  }

  /**
   * 执行带锁的任务
   * @param {string} task_name - 任务名称
   * @param {Function} task_fn - 任务函数
   */
  async execute_with_lock(task_name, task_fn) {
    // 如果正在执行，跳过本次执行
    if (this.running_flags[task_name]) {
      logs.log(`[定时任务] ${task_name} 正在执行中，跳过本次执行`);
      return;
    }

    // 设置执行标记
    this.running_flags[task_name] = true;

    try {
      await task_fn();
    } catch (error) {
      logs.error(`[定时任务] ${task_name} 执行失败:`, error);
    } finally {
      // 清除执行标记
      this.running_flags[task_name] = false;
    }
  }

  async init() {
    const bizSubscriptionLogic = require("../api/service/biz_subscription_logic");
    const usageSvc = require("../api/service/biz_usage_service");
    const baseModel = require("../middleware/baseModel");

    node_schedule.scheduleJob("10 0 * * *", async () => {
      await this.execute_with_lock("biz_subscription_expire", async () => {
        const n = await bizSubscriptionLogic.expireDueSubscriptions();
        logs.log(`[定时任务] 订阅到期扫描完成，更新行数: ${n}`);
      });
    });

    node_schedule.scheduleJob("0 9 * * *", async () => {
      await this.execute_with_lock("biz_subscription_renew_remind", async () => {
        const subs = await baseModel.biz_subscription.findAll({ where: { status: "active" } });
        const now = Date.now();
        for (const s of subs) {
          const end = new Date(s.end_time).getTime();
          const days = Math.ceil((end - now) / 86400000);
          if (days >= 0 && [7, 3, 1].includes(days)) {
            logs.log(
              `[续费提醒] subscription_id=${s.id} user_id=${s.user_id} 约 ${days} 天后到期`
            );
          }
        }
      });
    });

    node_schedule.scheduleJob("30 0 1 * *", async () => {
      await this.execute_with_lock("biz_usage_monthly_init", async () => {
        const n = await usageSvc.ensureUsageRowsForCurrentMonth();
        logs.log(`[定时任务] 月用量行初始化/补齐，处理订阅数: ${n}`);
      });
    });
  }
}

const schedule = new Schedule();
module.exports = schedule;