const OfferModel = require('../models/OfferModel')
const WalletTransactionModel = require('../models/WalletTransactionModel')
const { notifyUser } = require('./notifyUser')

const OFFER_REPLY_WINDOW_MS = 12 * 60 * 60 * 1000

/**
 * Called whenever a chat message is sent. If there's a pending paid Offer
 * between these two users, tracks the requester's first direct message and
 * the receiver's reply — the receiver's 50% commission is only credited if
 * they reply within 12 hours of that first message.
 */
async function trackOfferMessageForCommission (io, senderId, receiverId) {
  try {
    const offer = await OfferModel.findOne({
      $or: [
        { sender: senderId, receiver: receiverId },
        { sender: receiverId, receiver: senderId }
      ],
      commissionCredited: false,
      pendingCommissionAmount: { $gt: 0 }
    }).sort({ createdAt: -1 })

    if (!offer) return

    const isFromRequester = String(offer.sender) === String(senderId)

    if (isFromRequester) {
      if (!offer.firstMessageAt) {
        offer.firstMessageAt = new Date()
        offer.replyDeadline = new Date(Date.now() + OFFER_REPLY_WINDOW_MS)
        await offer.save()
      }
      return
    }

    // پیام از طرف گیرنده — کسی که باید ظرف ۱۲ ساعت پاسخ بدهد
    if (!offer.firstMessageAt || offer.repliedAt) return
    if (new Date() > offer.replyDeadline) return

    offer.repliedAt = new Date()
    offer.commissionCredited = true
    await offer.save()

    await WalletTransactionModel.create({
      user: offer.receiver,
      bucket: 'gift',
      type: 'credit',
      amount: offer.pendingCommissionAmount,
      referenceType: 'payment',
      referenceId: offer._id,
      description: 'سهم دریافتی از درخواست همکاری (۵۰٪، پس از پاسخ به‌موقع)'
    })

    if (io) {
      try {
        io.to(`user:${String(offer.receiver)}`).emit('notification', {
          type: 'offer_commission',
          title: 'واریز سهم درخواست همکاری',
          description: 'با پاسخ به‌موقع، ۵۰٪ مبلغ درخواست همکاری به کیف پول شما واریز شد.'
        })
      } catch (_) {}
    }
  } catch (error) {
    console.error('trackOfferMessageForCommission error:', error)
  }
}

/**
 * Sweep for paid Offers whose 12-hour reply deadline has passed without the
 * receiver replying — refunds the pending 30% commission to the sender's
 * wallet instead (both web and Android go through the same payment callback,
 * so a single server-side sweep covers both). Meant to be called
 * periodically by a cron job (see services/OfferReplyCron.js).
 */
async function refundExpiredOfferCommissions (io) {
  const now = new Date()
  const expiredOffers = await OfferModel.find({
    commissionCredited: false,
    commissionRefunded: false,
    pendingCommissionAmount: { $gt: 0 },
    firstMessageAt: { $ne: null },
    repliedAt: null,
    replyDeadline: { $lte: now }
  })

  for (const offer of expiredOffers) {
    try {
      offer.commissionRefunded = true
      await offer.save()

      await WalletTransactionModel.create({
        user: offer.sender,
        bucket: 'gift',
        type: 'credit',
        amount: offer.pendingCommissionAmount,
        referenceType: 'payment',
        referenceId: offer._id,
        description: 'بازگشت وجه درخواست همکاری (طرف مقابل ظرف ۱۲ ساعت مقرر پاسخ نداد)'
      })

      await notifyUser(io, offer.sender, {
        type: 'offer_commission_refunded',
        title: 'بازگشت وجه به کیف پول',
        description: 'طرف مقابل ظرف مهلت ۱۲ ساعته به درخواست همکاری شما پاسخ نداد؛ مبلغ به کیف پول شما بازگشت.'
      })
    } catch (error) {
      console.error('refundExpiredOfferCommissions error for offer', offer._id, error)
    }
  }

  return expiredOffers.length
}

module.exports = {
  trackOfferMessageForCommission,
  refundExpiredOfferCommissions,
  OFFER_REPLY_WINDOW_MS
}