// 浏览器调试能力自检：发现端口 → 连 CDP → 列出标签页 → 读取页面信息
import fs from 'node:fs';
import path from 'node:path';

const CANDIDATES = [
  'C:\\Users\\Administrator\\AppData\\Local\\Google\\Chrome\\User Data\\DevToolsActivePort',
  'C:\\Users\\Administrator\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\DevToolsActivePort',
];

const log = m => console.log(m);
let lines = null, usedFile = null;
for (const f of CANDIDATES) {
  if (fs.existsSync(f)) {
    const raw = fs.readFileSync(f, 'utf8').split('\n').map(s => s.trim()).filter(Boolean);
    if (raw.length >= 2) { lines = raw; usedFile = f; break; }
  }
}
if (!lines) { log('NOT_FOUND: 没找到 DevToolsActivePort，说明 Chrome 未以调试模式启动'); process.exit(0); }
log('端口文件: ' + usedFile);
log('端口: ' + lines[0] + '   浏览器WS路径: ' + lines[1]);

const url = `ws://127.0.0.1:${lines[0]}${lines[1]}`;
const t0 = Date.now();
const ws = new WebSocket(url);
const opened = await new Promise(res => {
  const timer = setTimeout(() => res(false), 60000);
  ws.addEventListener('open', () => { clearTimeout(timer); res(true); }, { once: true });
  ws.addEventListener('error', () => { clearTimeout(timer); res(false); }, { once: true });
});
if (!opened) { log('FAIL: WebSocket 连不上（Chrome 调试端口可能已关闭或需重新开启 chrome://inspect）'); process.exit(0); }
log(`CDP 握手成功，耗时 ${Date.now() - t0}ms`);

let seq = 0; const pend = new Map();
ws.addEventListener('message', ev => {
  let m; try { m = JSON.parse(ev.data); } catch { return; }
  if (m.id && pend.has(m.id)) { const p = pend.get(m.id); pend.delete(m.id); m.error ? p.rej(new Error(m.error.message)) : p.res(m.result); }
  else if (m.method) events.push(m);
});
const events = [];
const send = (method, params = {}, sid) => new Promise((res, rej) => {
  const id = ++seq; pend.set(id, { res, rej });
  const msg = { id, method, params }; if (sid) msg.sessionId = sid;
  ws.send(JSON.stringify(msg));
});

const { product, protocolVersion } = await send('Browser.getVersion');
log(`浏览器: ${product}  (CDP 协议 v${protocolVersion})`);

const { targetInfos } = await send('Target.getTargets');
const pages = targetInfos.filter(t => t.type === 'page');
log(`\n当前打开的标签页 ${pages.length} 个:`);
pages.forEach((t, i) => log(`  ${i + 1}. ${t.title.slice(0, 40)} | ${t.url.slice(0, 80)}`));

// 挑一个闲鱼页面做读取能力演示
const target = pages.find(p => /goofish/i.test(p.url)) || pages[0];
if (target) {
  const { sessionId } = await send('Target.attachToTarget', { targetId: target.targetId, flatten: true });
  const r = await send('Runtime.evaluate', {
    expression: `({url: location.href, title: document.title, readyState: document.readyState, bodyLen: document.body ? document.body.innerText.length : 0, loginState: document.body ? (document.body.innerText.includes('登录') ? '页面上出现"登录"字样' : '未见登录字样') : 'n/a'})`,
    returnByValue: true,
  }, sessionId);
  log('\n读取能力验证（对目标页执行 JS 并取回结果）:');
  log('  ' + JSON.stringify(r.result.value, null, 2).replace(/\n/g, '\n  '));
  await send('Target.detachFromTarget', { sessionId });
}
ws.close();
log('\n结论: 调试通道可用。');
setTimeout(() => process.exit(0), 300);