server.js

const express = require('express');
const multer = require('multer');
const path = require('path');
const axios = require('axios');
const FormData = require('form-data');
const fs = require('fs');
const dotenv = require('dotenv');
const cors = require('cors');

// Load environment variables
dotenv.config();

// Create Express app
const app = express();
const PORT = process.env.PORT || 3000;

// Configure CORS - only allow requests from your domain
const allowedOrigins = [
  'http://localhost:3000',                 // Local development
  'https://yourdomain.com',                // Production site
  'https://your-username.github.io'        // GitHub Pages
];

const corsOptions = {
  origin: function (origin, callback) {
    // During development, origin might be undefined (e.g., from Postman)
    if (!origin || allowedOrigins.indexOf(origin) !== -1) {
      callback(null, true);
    } else {
      callback(new Error('Not allowed by CORS'));
    }
  },
  methods: ['GET', 'POST'],
  allowedHeaders: ['Content-Type', 'Authorization']
};

app.use(cors(corsOptions));

// Serve static files from 'public' directory
app.use(express.static(path.join(__dirname, 'public')));

// Configure file upload
const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    const uploadDir = path.join(__dirname, 'uploads');
    // Ensure directory exists
    if (!fs.existsSync(uploadDir)) {
      fs.mkdirSync(uploadDir, { recursive: true });
    }
    cb(null, uploadDir);
  },
  filename: function (req, file, cb) {
    // Create unique filename with timestamp
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    cb(null, uniqueSuffix + path.extname(file.originalname));
  }
});

const upload = multer({ 
  storage: storage,
  limits: { fileSize: 5 * 1024 * 1024 }, // Limit to 5MB
  fileFilter: function (req, file, cb) {
    // Accept only image files
    if (!file.mimetype.startsWith('image/')) {
      return cb(new Error('Only image