const http = require('http');
const fs = require('fs');
const path = require('path');
const os = require('os');

const PORT = 8080;
const DIRECTORY = __dirname;

const MIME_TYPES = {
  '.html': 'text/html; charset=UTF-8',
  '.css': 'text/css',
  '.js': 'application/javascript',
  '.json': 'application/json',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.jpeg': 'image/jpeg',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon'
};

function getLocalIp() {
  const interfaces = os.networkInterfaces();
  for (const name of Object.keys(interfaces)) {
    for (const iface of interfaces[name]) {
      if (iface.family === 'IPv4' && !iface.internal) {
        return iface.address;
      }
    }
  }
  return '127.0.0.1';
}

const server = http.createServer((req, res) => {
  let reqPath = req.url.split('?')[0];
  if (reqPath === '/' || reqPath === '') reqPath = '/index.html';
  
  const filePath = path.join(DIRECTORY, reqPath);
  const ext = path.extname(filePath).toLowerCase();
  const contentType = MIME_TYPES[ext] || 'application/octet-stream';

  fs.readFile(filePath, (err, content) => {
    if (err) {
      if (err.code === 'ENOENT') {
        res.writeHead(404, { 'Content-Type': 'text/plain' });
        res.end('404 Not Found');
      } else {
        res.writeHead(500, { 'Content-Type': 'text/plain' });
        res.end(`Server Error: ${err.code}`);
      }
    } else {
      res.writeHead(200, {
        'Content-Type': contentType,
        'Access-Control-Allow-Origin': '*'
      });
      res.end(content);
    }
  });
});

server.listen(PORT, '0.0.0.0', () => {
  const localIp = getLocalIp();
  console.log('='.repeat(60));
  console.log('💎 Google Opal AI - iOS Web Studio is Live & Running!');
  console.log('='.repeat(60));
  console.log(`📱 Open on your iPhone Safari (connected to same Wi-Fi):`);
  console.log(`   👉 http://${localIp}:${PORT}`);
  console.log(`💻 Or on PC Browser: http://localhost:${PORT}`);
  console.log('='.repeat(60));
  console.log('💡 iPhone Instruction: Safari-তে গিয়ে "Share ➔ Add to Home Screen" দিন।');
  console.log('='.repeat(60));
});