/*
 * 本地静态文件服务器（可选工具）：node server.mjs [端口]
 * 双击 index.html 即可游玩，无需本服务器；仅当浏览器安全策略限制 file:// 页面时使用。
 */
import { createServer } from 'node:http';
import { readFile } from 'node:fs/promises';
import { extname, join, resolve } from 'node:path';

const root = resolve(process.argv[2] ? '.' : '.');
const port = Number(process.argv[2]) || 8765;

const MIME = {
  '.html': 'text/html; charset=utf-8',
  '.js': 'text/javascript; charset=utf-8',
  '.css': 'text/css; charset=utf-8',
};

createServer(async (req, res) => {
  try {
    const pathname = decodeURIComponent(new URL(req.url, 'http://localhost').pathname);
    const file = join(root, pathname.endsWith('/') ? join(pathname, 'index.html') : pathname);
    const data = await readFile(file);
    res.writeHead(200, { 'content-type': MIME[extname(file)] || 'application/octet-stream' });
    res.end(data);
  } catch {
    res.writeHead(404);
    res.end('not found');
  }
}).listen(port, '127.0.0.1', () => {
  console.log(`serving http://127.0.0.1:${port}/`);
});