#!/usr/bin/env node
/* Tiny zero-dependency static server for Diablo2D.
 *   node server.js [port]     (default 8080)
 */
const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = parseInt(process.argv[2] || process.env.PORT || '8080', 10);
const ROOT = __dirname;
const MIME = {
  '.html': 'text/html; charset=utf-8',
  '.js': 'text/javascript; charset=utf-8',
  '.mjs': 'text/javascript; charset=utf-8',
  '.css': 'text/css; charset=utf-8',
  '.json': 'application/json',
  '.webmanifest': 'application/manifest+json',
  '.png': 'image/png',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon',
  '.md': 'text/plain; charset=utf-8',
};

http.createServer((req, res) => {
  let urlPath = decodeURIComponent((req.url || '/').split('?')[0]);
  if (urlPath.endsWith('/')) urlPath += 'index.html';
  const file = path.normalize(path.join(ROOT, urlPath));
  if (!file.startsWith(ROOT)) { res.writeHead(403); return res.end('forbidden'); }
  fs.readFile(file, (err, data) => {
    if (err) { res.writeHead(404); return res.end('not found'); }
    res.writeHead(200, {
      'Content-Type': MIME[path.extname(file)] || 'application/octet-stream',
      'Cache-Control': 'no-cache',
    });
    res.end(data);
  });
}).listen(PORT, () => console.log(`Diablo2D running → http://localhost:${PORT}`));