const Logger = require('../Logger')
const { TaskScheduler } = require('./TaskScheduler')

class LeaseWatcher {
    constructor(options = {}) {
        this.intervalMs = options.intervalMs || 30 * 1000
        this.logger = options.logger || new Logger()
        this.scheduler = options.scheduler || new TaskScheduler()
        this.timer = null
        this.running = false
    }

    async tick() {
        if (this.running) {
            this.logger.warn('[QK][LeaseWatcher] 上一轮巡检尚未结束，跳过本次执行')
            return
        }
        this.running = true
        try {
            const count = await this.scheduler.requeueExpiredTasks()
            if (count > 0) {
                this.logger.info(`[QK][LeaseWatcher] 已将 ${count} 个失联任务重新入队`)
            }
        } catch (err) {
            this.logger.error(`[QK][LeaseWatcher] 执行失败：${err.stack || err}`)
        } finally {
            this.running = false
        }
    }

    start() {
        if (this.timer) {
            return this.timer
        }
        this.logger.info(`[QK][LeaseWatcher] 已启动，巡检间隔 ${this.intervalMs}ms`)
        this.tick()
        this.timer = setInterval(() => this.tick(), this.intervalMs)
        return this.timer
    }

    stop() {
        if (this.timer) {
            clearInterval(this.timer)
            this.timer = null
            this.logger.info('[QK][LeaseWatcher] 已停止')
        }
    }
}

module.exports = LeaseWatcher