import { createReadStream, existsSync, statSync } from 'node:fs';
import { dirname, extname, join, normalize } from 'node:path';
import { createServer } from 'node:http';
import { fileURLToPath } from 'node:url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const root = normalize(join(__dirname, '../../userfront/build/web'));

if (!existsSync(root) || !statSync(root).isDirectory()) {
  console.error(
    '[userfront-e2e] userfront/build/web not found. Run: cd userfront && flutter build web --wasm --release',
  );
  process.exit(1);
}

const port = Number.parseInt(process.env.PORT ?? '4173', 10);

const contentTypes = {
  '.css': 'text/css; charset=utf-8',
  '.html': 'text/html; charset=utf-8',
  '.ico': 'image/x-icon',
  '.js': 'application/javascript; charset=utf-8',
  '.json': 'application/json; charset=utf-8',
  '.mjs': 'application/javascript; charset=utf-8',
  '.png': 'image/png',
  '.svg': 'image/svg+xml; charset=utf-8',
  '.txt': 'text/plain; charset=utf-8',
  '.wasm': 'application/wasm',
  '.webmanifest': 'application/manifest+json; charset=utf-8',
  '.woff': 'font/woff',
  '.woff2': 'font/woff2',
};

const server = createServer((req, res) => {
  const url = new URL(req.url ?? '/', 'http://localhost');
  const pathname = decodeURIComponent(url.pathname);
  const relative = pathname === '/' ? '/index.html' : pathname;
  const candidate = normalize(join(root, relative));

  if (!candidate.startsWith(root)) {
    res.statusCode = 403;
    res.end('Forbidden');
    return;
  }

  let filePath = candidate;

  if (!existsSync(filePath) || statSync(filePath).isDirectory()) {
    // Flutter web 라우팅 경로(`/ko`, `/ko/signin`)도 index.html로 fallback 처리
    filePath = join(root, 'index.html');
  }

  const ext = extname(filePath);
  const contentType = contentTypes[ext] ?? 'application/octet-stream';

  res.setHeader('Content-Type', contentType);
  createReadStream(filePath)
    .on('error', () => {
      res.statusCode = 500;
      res.end('Internal Server Error');
    })
    .pipe(res);
});

server.listen(port, '127.0.0.1', () => {
  console.log(`[userfront-e2e] serving ${root} at http://127.0.0.1:${port}`);
});