/* cdp-diag-videoinfo.mjs — 诊断视频详情渲染失败（09-01） */
const CDP = 'http://127.0.0.1:9223';
function cdp(ws, method, params = {}) {
  return new Promise((resolve, reject) => {
    const id = ++cdp._id;
    const w = new WebSocket(ws);
    const timer = setTimeout(() => { try { w.close(); } catch (e) {} reject(new Error('timeout: ' + method)); }, 30000);
    w.onopen = () => w.send(JSON.stringify({ id, method, params }));
    w.onmessage = (ev) => {
      const m = JSON.parse(ev.data);
      if (m.id !== id) return;
      clearTimeout(timer);
      try { w.close(); } catch (e) {}
      m.error ? reject(new Error(method + ': ' + JSON.stringify(m.error))) : resolve(m.result);
    };
    w.onerror = () => { clearTimeout(timer); reject(new Error('ws error: ' + method)); };
  });
}
cdp._id = 0;
async function evalJs(ws, expr) {
  const r = await cdp(ws, 'Runtime.evaluate', { expression: expr, awaitPromise: true, returnByValue: true });
  return r.result && r.result.value;
}
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

async function main() {
  const tabs = await (await fetch(CDP + '/json')).json();
  const tab = tabs.find((x) => x.url.includes('localhost:8900')) || tabs.find((x) => x.type === 'page');
  const ws = tab.webSocketDebuggerUrl;
  await cdp(ws, 'Page.enable');
  await cdp(ws, 'Runtime.enable');
  const errors = [];
  const onEvt = (ev) => {
    const m = JSON.parse(ev.data);
    if (m.method === 'Runtime.exceptionThrown') errors.push(JSON.stringify(m.params.exceptionDetails).slice(0, 400));
    if (m.method === 'Runtime.consoleAPICalled' && m.params.type === 'error') errors.push('[console.error] ' + (m.params.args || []).map((a) => a.value || a.description || '').join(' ').slice(0, 300));
  };
  const sock = new WebSocket((await (await fetch(CDP + '/json')).json()).find((x) => x.id === tab.id).webSocketDebuggerUrl);
  sock.onmessage = onEvt;
  await new Promise((r) => (sock.onopen = r));

  await evalJs(ws, `location.href = 'http://localhost:8900/?v=diag1#/video/680'`);
  await sleep(4000);
  const state = await evalJs(ws, `(() => {
    const title = document.querySelector('.video-detail-title');
    const err = document.querySelector('.empty');
    return {
      hash: location.hash,
      hasTitle: !!title,
      emptyText: err ? err.textContent.trim().slice(0, 60) : '',
      bodyStart: document.body.textContent.trim().slice(0, 200),
      hasRenderFail: document.body.textContent.includes('渲染失败'),
      hasAccReset: document.body.textContent.includes('accReset')
    };
  })()`);
  console.log('STATE:', JSON.stringify(state, null, 2));
  console.log('JS ERRORS:', errors.length ? errors.join('\n') : '无');
  process.exit(0);
}
main().catch((e) => { console.error('ERROR:', e.message); process.exit(1); });