// 检查学习页面的 API 请求和错误
const wsUrl = process.argv[2] || "ws://127.0.0.1:9222/devtools/page/12";

const ws = new WebSocket(wsUrl);
let id = 0;
const pending = new Map();
const errors = [];

function send(method, params = {}) {
  return new Promise((resolve, reject) => {
    const msgId = ++id;
    pending.set(msgId, { resolve, reject });
    ws.send(JSON.stringify({ id: msgId, method, params }));
  });
}

ws.onmessage = (event) => {
  const msg = JSON.parse(event.data);
  if (msg.id && pending.has(msg.id)) {
    const { resolve, reject } = pending.get(msg.id);
    pending.delete(msg.id);
    if (msg.error) reject(new Error(JSON.stringify(msg.error)));
    else resolve(msg.result);
  } else if (msg.method === "Runtime.exceptionThrown") {
    errors.push("EXCEPTION: " + JSON.stringify(msg.params.exceptionDetails));
  } else if (msg.method === "Log.entryAdded") {
    errors.push("LOG: " + msg.params.entry.level + " " + msg.params.entry.text);
  } else if (msg.method === "Network.responseReceived") {
    const r = msg.params.response;
    if (r.status >= 400) {
      errors.push(`HTTP ${r.status}: ${r.url}`);
    }
  }
};

ws.onerror = (e) => {
  console.error("WS error:", e.message || e);
  process.exit(1);
};

ws.onopen = async () => {
  try {
    await send("Runtime.enable");
    await send("Log.enable");
    await send("Network.enable");

    // 重新加载学习页面
    await send("Page.navigate", { url: "http://192.168.5.7/learn" });
    await new Promise(r => setTimeout(r, 5000));

    const expr = `JSON.stringify({
      url: location.href,
      bodyText: document.body.innerText.slice(0, 300),
      courseCount: (() => { const m = document.body.innerText.match(/(\d+)门课程/); return m ? m[1] : 'N/A'; })()
    })`;
    const res = await send("Runtime.evaluate", { expression: expr, returnByValue: true });
    console.log("PAGE:", res.result.value);
    console.log("\nERRORS:");
    errors.forEach(e => console.log(e));
    if (errors.length === 0) console.log("(no errors captured)");
  } catch (e) {
    console.error("Error:", e.message);
  } finally {
    ws.close();
    process.exit(0);
  }
};