const fs = require('fs');
const net = require('net');
const path = require('path');
const { jpegSplitter } = require('./phone_module');

const MARKER = path.join(__dirname, '..', '..', '.audio_bridge');

const bridgePort = () => {
  try {
    const port = Number(String(fs.readFileSync(MARKER, 'utf8')).trim());
    return Number.isFinite(port) && port > 0 ? port : 0;
  } catch (_) {
    return 0;
  }
};

module.exports = () => ({
  available: () => bridgePort() > 0,
  open({ onJpeg, onEnd }) {
    const port = bridgePort();
    if (!port) return null;
    let ended = false;
    const finish = () => {
      if (ended) return;
      ended = true;
      try { onEnd(); } catch (_) {}
    };
    const sock = net.connect(port, '127.0.0.1');
    sock.setNoDelay(true);
    sock.on('error', finish);
    sock.on('close', finish);
    sock.on('connect', () => sock.write('C'));
    sock.on('data', jpegSplitter((jpeg) => { if (!ended) onJpeg(jpeg); }));
    return { stop() { ended = true; try { sock.destroy(); } catch (_) {} } };
  }
});