// Browser-control HTTP endpoint for the BROWSER HOST.
//
// The on-screen Chrome, the X display (:1), xdotool (real cursor/keyboard) and
// the broadcast capture all live on THIS machine. A remote `bot` on another PC
// therefore cannot drive them directly — it must send a command here, where
// chrome-control.mjs runs LOCALLY (real input lands on this host's screen,
// visible on its VNC / Go-Live).
//
//   POST /control   body: {"action":"navigate","url":"naver.com", ...}
//   GET  /health
//
// Internal-network use only (no auth, per deployment decision). Bind/port:
//   BROWSER_CONTROL_BIND (default 0.0.0.0), BROWSER_CONTROL_PORT (default 8777)
import http from 'node:http';
import { execFile } from 'node:child_process';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';

const PORT = parseInt(process.env.BROWSER_CONTROL_PORT || '8777', 10);
const BIND = process.env.BROWSER_CONTROL_BIND || '0.0.0.0';
const SCRIPT = join(dirname(fileURLToPath(import.meta.url)), 'chrome-control.mjs');

const server = http.createServer((req, res) => {
  if (req.method === 'GET' && req.url === '/health') {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ ok: true, host: 'browser' }));
    return;
  }
  if (req.method !== 'POST') {
    res.writeHead(405); res.end('POST /control');
    return;
  }
  let body = '';
  req.on('data', (c) => { body += c; if (body.length > 1e6) req.destroy(); });
  req.on('end', () => {
    // Run the action LOCALLY: chrome-control.mjs uses CDP + xdotool on this
    // host, so the cursor really moves and text is typed on this screen.
    execFile('node', [SCRIPT, body || '{}'], { timeout: 95_000, env: process.env }, (err, stdout, stderr) => {
      res.writeHead(200, { 'Content-Type': 'application/json' });
      const out = (stdout || '').trim();
      res.end(out || JSON.stringify({ ok: false, error: String((stderr || '').trim() || err?.message || 'no output') }));
    });
  });
});

server.listen(PORT, BIND, () => {
  console.log(`[control-server] listening on ${BIND}:${PORT} (browser host)`);
});