const https = require('https');
const httpProxy = require('http-proxy');
const fs = require('fs');

const certPath = process.argv[2];
const keyPath = process.argv[3];
const targetHost = process.argv[4] || 'localhost';
const targetPort = parseInt(process.argv[5] || '3000', 10);
const PORT = parseInt(process.argv[6] || '3443', 10);
const HOST = process.argv[7] || '0.0.0.0';

const proxy = httpProxy.createProxyServer({
  target: { host: targetHost, port: targetPort, protocol: 'http:' },
  ws: true,
  changeOrigin: true,
  proxyTimeout: 60000,
  timeout: 60000,
});

proxy.on('error', (err, req, res) => {
  if (res && res.writeHead) {
    try { res.writeHead(502).end(); } catch {}
  }
});

const server = https.createServer({
  cert: fs.readFileSync(certPath),
  key: fs.readFileSync(keyPath),
}, (req, res) => {
  proxy.web(req, res);
});

server.on('upgrade', (req, socket, head) => {
  proxy.ws(req, socket, head);
});

server.listen(PORT, HOST, () => {
  const ifaces = require('os').networkInterfaces();
  let ip = 'localhost';
  for (const name of Object.keys(ifaces)) {
    for (const iface of ifaces[name]) {
      if (iface.family === 'IPv4' && !iface.internal) { ip = iface.address; break; }
    }
    if (ip !== 'localhost') break;
  }
  console.log(`HTTPS proxy: https://${ip}:${PORT}`);
});