server.js

// Simple HTTP server for the web UI
import http from 'http';
import fs from 'fs';
import path from 'path';

const PORT = 3000;
const MIME = {
  '.html': 'text/html',
  '.js': 'application/javascript',
  '.css': 'text/css',
  '.json': 'application/json',
  '.png': 'image/png',
};

const server = http.createServer((req, res) => {
  let filePath;
  if (req.url === '/' || req.url === '/index.html') {
    filePath = './web/index.html';
  } else if (req.url.startsWith('/data/')) {
    filePath = '.' + req.url;
  } else {
    filePath = './web' + req.url;
  }

  const ext = path.extname(filePath);
  const contentType = MIME[ext] || 'application/octet-stream';

  fs.readFile(filePath, (err, content) => {
    if (err) {
      res.writeHead(404);
      res.end('Not found');
      return;
    }
    res.writeHead(200, { 'Content-Type': contentType });
    res.end(content);
  });
});

server.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}`);
});