// Einfacher TCP-Relay fuer CI unter Docker-in-Docker (Issue #38, D2).
//
// Die Supabase-Ports (Kong 54321, Postgres 54322, Mailpit 54324, Extra-GoTrue 9998) liegen im dind,
// nicht im Job-Container. Die Tests und die Web-App erwarten 127.0.0.1. Dieses Skript leitet
// 127.0.0.1:<port> an <host>:<port> weiter (HTTP und Postgres, rein TCP).
//
// Aufruf: node tcp-forward.mjs <ziel-host> <port> [<port> ...]
import net from 'node:net';

const [host, ...ports] = process.argv.slice(2);
if (!host || ports.length === 0) {
  console.error('Aufruf: node tcp-forward.mjs <ziel-host> <port> [<port> ...]');
  process.exit(2);
}

for (const p of ports) {
  const port = Number(p);
  if (!Number.isInteger(port) || port < 1 || port > 65535) {
    console.error(`Ungueltiger Port: ${p}`);
    process.exit(2);
  }
  net
    .createServer((client) => {
      const upstream = net.connect(port, host);
      client.pipe(upstream).pipe(client);
      const close = () => {
        client.destroy();
        upstream.destroy();
      };
      client.on('error', close);
      upstream.on('error', close);
      client.on('close', close);
      upstream.on('close', close);
    })
    .on('error', (err) => {
      console.error(`Relay ${port}: ${err.message}`);
      process.exit(1);
    })
    .listen(port, '127.0.0.1', () => console.log(`127.0.0.1:${port} -> ${host}:${port}`));
}