#!/usr/bin/env node
// Serve the localized production build so the language switcher actually works locally.
// `ng build --localize` emits dist/.../browser/{nl,en}/ (each with base href /nl/ or /en/).
// Plain `ng serve` (npm start) serves only nl at /, so switching 404s there — this static
// server serves both locale subdirs with per-locale SPA fallback (a miss under /<locale>/…
// serves that locale's index.html), so deep-link switches resolve. Demo only, not prod infra.
import { createServer } from 'node:http';
import { readFile } from 'node:fs/promises';
import { join, extname, normalize } from 'node:path';

const ROOT = 'dist/atomic-design-poc/browser';
const PORT = 4300;
const MIME = {
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.mjs': 'text/javascript',
  '.css': 'text/css',
  '.json': 'application/json',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon',
  '.woff2': 'font/woff2',
  '.png': 'image/png',
};

const send = (res, status, body, type) => {
  res.writeHead(status, { 'content-type': type });
  res.end(body);
};

createServer(async (req, res) => {
  const url = decodeURIComponent((req.url ?? '/').split('?')[0]);
  // Landing at / has no locale bundle — redirect to Dutch.
  if (url === '/') {
    res.writeHead(302, { location: '/nl/' });
    return res.end();
  }
  const rel = normalize(url).replace(/^(\.\.[/\\])+/, ''); // no path traversal
  const locale = url.startsWith('/en/') ? 'en' : 'nl';
  try {
    const file = await readFile(join(ROOT, rel));
    send(res, 200, file, MIME[extname(rel)] ?? 'application/octet-stream');
  } catch {
    // SPA fallback to the requested locale's index.html.
    try {
      const index = await readFile(join(ROOT, locale, 'index.html'));
      send(res, 200, index, 'text/html');
    } catch {
      send(res, 404, 'Not found', 'text/plain');
    }
  }
}).listen(PORT, () => {
  console.log(`Serving ${ROOT} at http://localhost:${PORT}/  (→ /nl/, /en/)`);
});