From 9cb521aa1b3dd7252ee906fb74ea9b592ad5799f Mon Sep 17 00:00:00 2001
From: Ukaykhingmarma28 <ukaykhingmarma28@gmail.com>
Date: Mon, 3 Feb 2025 23:17:20 +0600
Subject: serial number generation change

---
 index.js | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index fb63662..2354315 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,6 @@
 import express from 'express';
 import { MongoClient } from 'mongodb';
 import { google } from 'googleapis';
-import crypto from 'crypto';
 import dotenv from 'dotenv'; 
 import fs from 'fs'; 
 import cors from 'cors';
@@ -49,8 +48,26 @@ async function connectDB() {
 
 connectDB();
 
-function generateSerialNumber(mac) {
-    return `JPC${crypto.createHash('sha3-224').update(mac).digest('hex').toUpperCase().substring(0, 6)}`;
+async function generateSerialNumber() {
+    const db = client.db(dbName);
+    const collection = db.collection(collectionName);
+
+    const year = new Date().getFullYear().toString().slice(-2); // Get last two digits of the year
+
+    const latestDevice = await collection.find({ serialNumber: { $regex: `^JPC${year}` } })
+        .sort({ serialNumber: -1 })
+        .limit(1)
+        .toArray();
+
+    let nextNumber = 1; // Default start
+
+    if (latestDevice.length > 0) {
+        const lastSerial = latestDevice[0].serialNumber;
+        const lastNumber = parseInt(lastSerial.substring(5, 11), 10); // Extract last 6 digits
+        nextNumber = lastNumber + 1;
+    }
+
+    return `JPC${year}${String(nextNumber).padStart(6, '0')}`;
 }
 
 app.post('/upload', async (req, res) => {
@@ -70,7 +87,7 @@ app.post('/upload', async (req, res) => {
             return res.status(400).send(`Device with the same MAC address is already registered, ${existingDevice.serialNumber}`);
         }
 
-        const serialNumber = generateSerialNumber(mac);
+        const serialNumber = await generateSerialNumber();
   
         const newItem = {
             serialNumber,
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