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utils/offerReplyGate.js

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+const OfferModel = require('../models/OfferModel')
+const WalletTransactionModel = require('../models/WalletTransactionModel')
+
+const OFFER_REPLY_WINDOW_MS = 24 * 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 30% commission is only credited if
+ * they reply within 24 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: { $gt: 0 }
+    }).sort({ createdAt: -1 })
+
+    if (!offer) return
+
+    const isFromRequester = String(offer.sender) === String(senderId)
+
+    if (isFromRequester) {
+      if (!offer.firstMessageAt) {
+        offer.firstMessageAt = new Date()
+        offer.replyDeadline = new Date(Date.now() + OFFER_REPLY_WINDOW_MS)
+        await offer.save()
+      }
+      return
+    }
+
+    // پیام از طرف گیرنده — کسی که باید ظرف ۲۴ ساعت پاسخ بدهد
+    if (!offer.firstMessageAt || offer.repliedAt) return
+    if (new Date() > offer.replyDeadline) return
+
+    offer.repliedAt = new Date()
+    offer.commissionCredited = true
+    await offer.save()
+
+    await WalletTransactionModel.create({
+      user: offer.receiver,
+      bucket: 'gift',
+      type: 'credit',
+      amount: offer.pendingCommissionAmount,
+      referenceType: 'payment',
+      referenceId: offer._id,
+      description: 'سهم دریافتی از درخواست همکاری (۳۰٪، پس از پاسخ به‌موقع)'
+    })
+
+    if (io) {
+      try {
+        io.to(`user:${String(offer.receiver)}`).emit('notification', {
+          type: 'offer_commission',
+          title: 'واریز سهم درخواست همکاری',
+          description: 'با پاسخ به‌موقع، ۳۰٪ مبلغ درخواست همکاری به کیف پول شما واریز شد.'
+        })
+      } catch (_) {}
+    }
+  } catch (error) {
+    console.error('trackOfferMessageForCommission error:', error)
+  }
+}
+
+module.exports = { trackOfferMessageForCommission, OFFER_REPLY_WINDOW_MS }