/* cdp-align-videoinfo.mjs — 测量视频详情页 .video-grid 各字段 x 坐标，验证跨行列对齐（09-02）
 * 期望：第 i 列两行字段 left 一致（时长↔分享、发布时间↔收藏）
 */
const CDP = 'http://127.0.0.1:9223';
async function getWs(targetId) {
  const tabs = await (await fetch(CDP + '/json')).json();
  const t = tabs.find((x) => x.id === targetId);
  if (!t) throw new Error('target not found: ' + targetId);
  return t.webSocketDebuggerUrl;
}
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 });
  if (r.exceptionDetails) throw new Error('eval err: ' + JSON.stringify(r.exceptionDetails).slice(0, 300));
  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');
  if (!tab) throw new Error('no 8900 tab found');
  const ws = await getWs(tab.id);
  await cdp(ws, 'Page.enable');
  await cdp(ws, 'Runtime.enable');
  // 复用现有 8900 标签页导航（新开 Tab 访问 localhost 会 chrome-error）
  await cdp(ws, 'Page.navigate', { url: 'http://localhost:8900/?v=aligncheck0902#/video/309' });
  await sleep(2500);
  const measure = `(() => {
    const items = [...document.querySelectorAll('.video-info .video-grid .info-item')];
    if (!items.length) return { err: 'video-grid items not found', html: document.querySelector('.video-info') ? document.querySelector('.video-info').textContent.slice(0, 80) : 'no .video-info' };
    const row = (el) => Math.round(el.getBoundingClientRect().top / 5);
    return items.map((el, i) => {
      const label = el.querySelector('.info-label') ? el.querySelector('.info-label').textContent.trim() : '?';
      const r = el.getBoundingClientRect();
      return { i, label, left: Math.round(r.left), top: Math.round(r.top), row: row(el) };
    });
  })()`;
  const list = await evalJs(ws, measure);
  if (list.err) { console.error('ERR:', list.err); process.exit(1); }
  // 按 row 分组（前两行各 4 项）
  const rows = {};
  for (const it of list) { (rows[it.row] = rows[it.row] || []).push(it); }
  const rKeys = Object.keys(rows).sort((a, b) => a - b).slice(0, 2);
  console.log('=== .video-grid 字段测量 ===');
  for (const k of rKeys) {
    console.log('行' + k + ':', rows[k].map((x) => `${x.label}@${x.left}`).join('  '));
  }
  if (rKeys.length === 2) {
    const a = rows[rKeys[0]], b = rows[rKeys[1]];
    const diff2 = a[2].left - b[2].left;
    const diff3 = a[3].left - b[3].left;
    console.log('---');
    console.log('第3列(时长↔分享) left 差:', diff2, diff2 === 0 ? '✅ 对齐' : '❌ 未对齐');
    console.log('第4列(发布时间↔收藏) left 差:', diff3, diff3 === 0 ? '✅ 对齐' : '❌ 未对齐');
    const labels1 = a.map((x) => x.label).join('/');
    const labels2 = b.map((x) => x.label).join('/');
    console.log('行1:', labels1, '| 行2:', labels2);
  } else {
    console.log('⚠️ 只识别到', rKeys.length, '行');
  }
  process.exit(0);
}
main().catch((e) => { console.error('ERROR:', e.message); process.exit(1); });