// Tiny static preview server for dist/ — mirrors how a real host serves it.
// Usage: node tools/serve.js [port]   (default 8123)
const http = require('http');
const fs = require('fs');
const path = require('path');

const DIST = path.join(__dirname, '..', 'dist');
const PORT = Number(process.argv[2]) || 8123;
const MIME = {
  '.html': 'text/html; charset=utf-8', '.css': 'text/css', '.js': 'text/javascript',
  '.mjs': 'text/javascript', '.json': 'application/json', '.webp': 'image/webp',
  '.jpg': 'image/jpeg', '.jpeg': 'image/jpeg', '.png': 'image/png', '.svg': 'image/svg+xml',
  '.woff2': 'font/woff2', '.glb': 'model/gltf-binary', '.xml': 'application/xml', '.txt': 'text/plain',
};

http.createServer((req, res) => {
  let p = decodeURIComponent(req.url.split('?')[0]);
  if (p.endsWith('/')) p += 'index.html';
  let file = path.normalize(path.join(DIST, p));
  if (!file.startsWith(DIST)) { res.writeHead(403); return res.end(); }
  if (!fs.existsSync(file) || fs.statSync(file).isDirectory()) {
    const asDir = path.join(file, 'index.html');
    if (fs.existsSync(asDir)) file = asDir;
    else { file = path.join(DIST, '404.html'); res.statusCode = 404; }
  }
  res.setHeader('content-type', MIME[path.extname(file).toLowerCase()] || 'application/octet-stream');
  fs.createReadStream(file).pipe(res);
}).listen(PORT, () => console.log('serving dist/ on http://localhost:' + PORT));