const cron = require('node-cron')
const BookingConfigModel = require('../models/BookingConfigModel')
const { notifyUser } = require('../utils/notifyUser')

let ioInstance = null

/** Called once from index.js right after the socket.io server is created — cron jobs have no `req`. */
function setIo (io) {
  ioInstance = io
}

/** Auto-deactivate configs whose "تکرار هفته" window has ended, and notify the owner so they can renew it themselves. */
const expireWeeklyRepeatConfigs = async () => {
  try {
    const configs = await BookingConfigModel.find({
      status: 'active',
      weeklyRepeatCount: { $ne: null },
      repeatStartedAt: { $ne: null }
    })

    const now = Date.now()
    let expiredCount = 0

    for (const config of configs) {
      const expiresAt = new Date(config.repeatStartedAt).getTime() + config.weeklyRepeatCount * 7 * 24 * 60 * 60 * 1000
      if (expiresAt > now) continue

      try {
        config.status = 'inactive'
        await config.save()
        expiredCount += 1
        await notifyUser(ioInstance, config.owner, {
          project_post_id: config._id,
          type: 'booking',
          title: 'پایان تکرار هفتگی رزرو',
          description: `مهلت تکرار هفتگی (${config.weeklyRepeatCount} هفته) برای رزرو «${config.name}» به پایان رسید و غیرفعال شد. برای ادامه، آن را دوباره فعال کنید.`
        })
      } catch (err) {
        console.error(`[BookingRepeatExpiryCron] failed to expire config ${config._id}:`, err)
      }
    }

    if (expiredCount) {
      console.log(`[BookingRepeatExpiryCron] auto-deactivated ${expiredCount} config(s) whose weekly repeat window ended`)
    }
  } catch (error) {
    console.error('[BookingRepeatExpiryCron] check failed:', error)
  }
}

// هر ساعت: بررسی پایان مهلت تکرار هفتگی رزروها
cron.schedule('0 * * * *', expireWeeklyRepeatConfigs)

module.exports = {
  expireWeeklyRepeatConfigs,
  setIo
}