const cron = require('node-cron')
const OrderModel = require('../models/OrderModel')
const { releaseOrderFunds, PAYMENT_TIMEOUT_MINUTES } = require('../controllers/application/orders/orderController')
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-release seller funds 7 days after fulfillment if the buyer never confirmed receipt. */
const autoReleaseFulfilledOrders = async () => {
  const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000)

  try {
    const orders = await OrderModel.find({
      status: { $in: ['shipped', 'ready_for_pickup'] },
      walletReleased: false,
      fulfilledAt: { $lte: sevenDaysAgo }
    })

    for (const order of orders) {
      try {
        await releaseOrderFunds(order, 'auto_released', ioInstance)
      } catch (err) {
        console.error(`[OrderLifecycleCron] failed to release order ${order._id}:`, err)
      }
    }

    if (orders.length) {
      console.log(`[OrderLifecycleCron] auto-released ${orders.length} order(s)`)
    }
  } catch (error) {
    console.error('[OrderLifecycleCron] auto-release query failed:', error)
  }
}

/** Cancel unpaid orders that missed the 60-minute payment window. */
const autoCancelUnpaidOrders = async () => {
  const cutoff = new Date(Date.now() - PAYMENT_TIMEOUT_MINUTES * 60 * 1000)

  try {
    const orders = await OrderModel.find({ status: 'pending_payment', createdAt: { $lte: cutoff } })

    for (const order of orders) {
      try {
        order.status = 'cancelled'
        order.cancelReason = 'عدم پرداخت در بازه زمانی مجاز'
        await order.save()
        await notifyUser(ioInstance, order.buyer, {
          project_post_id: order._id,
          type: 'shop_order',
          title: 'لغو سفارش',
          description: 'سفارش شما به دلیل عدم پرداخت در بازه زمانی مجاز لغو شد.'
        })
      } catch (err) {
        console.error(`[OrderLifecycleCron] failed to cancel order ${order._id}:`, err)
      }
    }

    if (orders.length) {
      console.log(`[OrderLifecycleCron] auto-cancelled ${orders.length} unpaid order(s)`)
    }
  } catch (error) {
    console.error('[OrderLifecycleCron] auto-cancel failed:', error)
  }
}

// هر ساعت: بررسی سفارش‌های تحویل‌شده‌ی بدون تایید خریدار برای آزادسازی خودکار وجه
cron.schedule('0 * * * *', autoReleaseFulfilledOrders)

// هر ۱۰ دقیقه: لغو سفارش‌های پرداخت‌نشده‌ی خارج از مهلت ۶۰ دقیقه‌ای
cron.schedule('*/10 * * * *', autoCancelUnpaidOrders)

module.exports = {
  autoReleaseFulfilledOrders,
  autoCancelUnpaidOrders,
  setIo
}