// Lightweight static file server for Reaktor modular synth
const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = process.env.PORT || 80;
const STATIC_DIR = path.join(__dirname, 'dist');

const MIME = {
  '.html': 'text/html', '.css': 'text/css', '.js': 'application/javascript',
  '.json': 'application/json', '.png': 'image/png', '.jpg': 'image/jpeg',
  '.svg': 'image/svg+xml', '.ico': 'image/x-icon', '.woff2': 'font/woff2',
  '.wasm': 'application/wasm',
};

const server = http.createServer((req, res) => {
  let filePath = path.join(STATIC_DIR, req.url === '/' ? 'index.html' : req.url);

  // SPA fallback: if file doesn't exist, serve index.html
  if (!fs.existsSync(filePath) || fs.statSync(filePath).isDirectory()) {
    filePath = path.join(STATIC_DIR, 'index.html');
  }

  if (!filePath.startsWith(STATIC_DIR)) {
    res.writeHead(403); res.end('Forbidden'); return;
  }

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

  fs.readFile(filePath, (err, data) => {
    if (err) {
      res.writeHead(err.code === 'ENOENT' ? 404 : 500);
      res.end(err.code === 'ENOENT' ? 'Not found' : 'Server error');
      return;
    }
    if (['.png', '.jpg', '.woff2', '.js', '.css'].includes(ext)) {
      res.setHeader('Cache-Control', 'public, max-age=604800');
    }
    res.writeHead(200, { 'Content-Type': contentType });
    res.end(data);
  });
});

server.listen(PORT, () => {
  console.log(`[reaktor] Running on port ${PORT}`);
});