import { writeFileSync } from "node:fs";

const cdpPort = process.env.CDP_PORT ?? "9224";
const baseUrl = process.env.SITE_URL ?? "http://127.0.0.1:4323";
const pages = await fetch(`http://127.0.0.1:${cdpPort}/json/list`).then((response) => response.json());
const page = pages.find((entry) => entry.type === "page");
if (!page) throw new Error(`CDP ${cdpPort} 没有可用页面`);

const socket = new WebSocket(page.webSocketDebuggerUrl);
await new Promise((resolve, reject) => {
  socket.addEventListener("open", resolve, { once: true });
  socket.addEventListener("error", reject, { once: true });
});

let nextId = 0;
const pending = new Map();
const exceptions = [];
socket.addEventListener("message", (event) => {
  const message = JSON.parse(event.data);
  if (message.id && pending.has(message.id)) {
    const { resolve, reject } = pending.get(message.id);
    pending.delete(message.id);
    if (message.error) reject(new Error(message.error.message));
    else resolve(message.result);
  }
  if (message.method === "Runtime.exceptionThrown") {
    exceptions.push(message.params.exceptionDetails.exception?.description ?? message.params.exceptionDetails.text);
  }
});

const command = (method, params = {}) => new Promise((resolve, reject) => {
  const id = ++nextId;
  pending.set(id, { resolve, reject });
  socket.send(JSON.stringify({ id, method, params }));
});
const pause = (milliseconds) => new Promise((resolve) => setTimeout(resolve, milliseconds));
const evaluate = async (expression) => {
  const result = await command("Runtime.evaluate", { expression, returnByValue: true, awaitPromise: true });
  if (result.exceptionDetails) throw new Error(result.exceptionDetails.exception?.description ?? result.exceptionDetails.text);
  return result.result.value;
};
const navigate = async (path) => {
  await command("Page.navigate", { url: `${baseUrl}${path}` });
  for (let attempt = 0; attempt < 60; attempt += 1) {
    await pause(100);
    if (await evaluate("document.readyState === 'complete'")) return;
  }
  throw new Error(`${path} 加载超时`);
};
const screenshot = async (path, full = false) => {
  const params = { format: "png", captureBeyondViewport: full };
  if (full) {
    const metrics = await command("Page.getLayoutMetrics");
    params.clip = {
      x: 0,
      y: 0,
      width: metrics.cssContentSize.width,
      height: metrics.cssContentSize.height,
      scale: 1,
    };
  }
  const result = await command("Page.captureScreenshot", params);
  writeFileSync(path, Buffer.from(result.data, "base64"));
};

await command("Page.enable");
await command("Runtime.enable");
await command("Emulation.setDeviceMetricsOverride", {
  width: 1440,
  height: 1100,
  deviceScaleFactor: 1,
  mobile: false,
});
await navigate("/foundations/language-models/");
await screenshot("/tmp/llm-atlas-language-history-desktop.png");

const overview = await evaluate(`(() => ({
  title: document.querySelector("h1")?.textContent.trim(),
  sections: document.querySelectorAll(".article-section").length,
  tocLinks: document.querySelectorAll(".side-rail a").length,
  paperLinks: document.querySelectorAll(".paper-chain a").length,
  labTabs: document.querySelectorAll("[data-history-tab]").length,
  labPanels: document.querySelectorAll("[data-history-panel]").length,
  documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
  mainObjective: document.querySelector(".objective-stack .main h3")?.textContent,
}))()`);

const probability = await evaluate(`(() => {
  const root = document.querySelector("[data-history-lab]");
  const read = () => ({
    probability: root.querySelector("[data-sequence-probability]").textContent,
    nll: root.querySelector("[data-sequence-nll]").textContent,
    ppl: root.querySelector("[data-sequence-ppl]").textContent,
    zeroSteps: root.querySelectorAll(".sequence-readout .zero").length,
  });
  const initial = read();
  const slider = root.querySelector("[data-smoothing]");
  slider.value = "20";
  slider.dispatchEvent(new Event("input", { bubbles: true }));
  const smoothed = read();
  root.querySelector("[data-ngram-order]").value = "1";
  root.querySelector("[data-ngram-order]").dispatchEvent(new Event("change", { bubbles: true }));
  const unigram = read();
  return { initial, smoothed, unigram };
})()`);

const embedding = await evaluate(`(() => {
  const root = document.querySelector("[data-history-lab]");
  root.querySelector('[data-history-tab="embedding"]').click();
  root.querySelector('[data-word="dog"]').click();
  return {
    selected: root.querySelector("[data-selected-word]").textContent,
    onehot: [...root.querySelectorAll("[data-onehot-vector] i")].map((node) => node.textContent).join(""),
    activeMap: root.querySelector(".map-point.selected b").textContent,
    visiblePanel: root.querySelector("[data-history-panel]:not([hidden])").dataset.historyPanel,
  };
})()`);

const memory = await evaluate(`(() => {
  const root = document.querySelector("[data-history-lab]");
  root.querySelector('[data-history-tab="memory"]').click();
  const distance = root.querySelector("[data-memory-distance]");
  const retention = root.querySelector("[data-memory-retention]");
  distance.value = "50";
  distance.dispatchEvent(new Event("input", { bubbles: true }));
  retention.value = "0.99";
  retention.dispatchEvent(new Event("change", { bubbles: true }));
  return {
    signal: root.querySelector("[data-memory-signal]").textContent,
    distance: root.querySelector("[data-distance-label]").textContent,
    rnn: root.querySelector("[data-rnn-value]").textContent,
    lstm: root.querySelector("[data-lstm-value]").textContent,
  };
})()`);

const seq2seq = await evaluate(`(() => {
  const root = document.querySelector("[data-history-lab]");
  root.querySelector('[data-history-tab="seq2seq"]').click();
  root.querySelector('[data-seq-mode="attention"]').click();
  root.querySelector('[data-decoder-step="1"]').click();
  const weights = [...root.querySelectorAll("[data-source-value]")].map((node) => node.textContent);
  const firstTab = root.querySelector('[data-history-tab="probability"]');
  firstTab.focus();
  firstTab.dispatchEvent(new KeyboardEvent("keydown", { key: "End", bubbles: true }));
  return {
    token: root.querySelector("[data-decoder-token]").textContent,
    weights,
    note: root.querySelector("[data-seq-note]").textContent,
    bridge: root.querySelector("[data-bridge-label]").textContent,
    keyboardSelected: root.querySelector('[data-history-tab][aria-selected="true"]').dataset.historyTab,
    keyboardVisible: root.querySelector("[data-history-panel]:not([hidden])").dataset.historyPanel,
  };
})()`);

await evaluate(`document.querySelector("[data-history-lab]").scrollIntoView({ block: "start", behavior: "instant" })`);
await pause(180);
await screenshot("/tmp/llm-atlas-language-history-lab-desktop.png");

await command("Emulation.setDeviceMetricsOverride", {
  width: 390,
  height: 844,
  deviceScaleFactor: 1,
  mobile: true,
});
await navigate("/foundations/language-models/");
const mobile = await evaluate(`(() => {
  const root = document.querySelector("[data-history-lab]");
  root.scrollIntoView({ block: "start", behavior: "instant" });
  const toggle = document.querySelector("#menu-toggle");
  toggle?.click();
  return {
    documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
    menuVisible: getComputedStyle(toggle).display !== "none",
    menuOpen: toggle.getAttribute("aria-expanded"),
    tabs: root.querySelectorAll("[data-history-tab]").length,
    offenders: [...document.querySelectorAll("body *")]
      .filter((node) => node.getBoundingClientRect().right > document.documentElement.clientWidth + 1)
      .slice(0, 12)
      .map((node) => ({
        tag: node.tagName,
        className: typeof node.className === "string" ? node.className : "",
        right: Math.round(node.getBoundingClientRect().right),
        width: Math.round(node.getBoundingClientRect().width),
      })),
  };
})()`);
await pause(180);
await screenshot("/tmp/llm-atlas-language-history-mobile.png");

const report = { overview, probability, embedding, memory, seq2seq, mobile, exceptions };
console.log(JSON.stringify(report, null, 2));

const numeric = (value) => Number.parseFloat(value);
const failures = [];
if (overview.sections !== 21 || overview.tocLinks !== 21) failures.push("章节/目录数量异常");
if (overview.paperLinks !== 33) failures.push("正式论文链不是 33 个节点");
if (overview.labTabs !== 4 || overview.labPanels !== 4) failures.push("四联实验结构异常");
if (overview.documentOverflow > 1 || mobile.documentOverflow > 1) failures.push("桌面或移动端存在横向溢出");
if (overview.mainObjective?.trim() !== "Next-token NLL") failures.push("当代目标主次标签异常");
if (probability.initial.ppl !== "∞" || probability.initial.zeroSteps !== 1) failures.push("零概率未击穿初始序列");
if (!Number.isFinite(numeric(probability.smoothed.ppl)) || numeric(probability.smoothed.probability) <= 0) failures.push("平滑没有救活未见序列");
if (probability.unigram.zeroSteps !== 0) failures.push("Unigram 不应出现零概率步骤");
if (embedding.selected.trim() !== "狗" || embedding.onehot !== "0100000" || embedding.activeMap.trim() !== "狗") failures.push("Embedding 选择状态不同步");
if (memory.distance.trim() !== "50 步" || numeric(memory.signal) < 60 || numeric(memory.signal) > 61) failures.push("记忆指数衰减计算异常");
if (seq2seq.token.trim() !== "猫" || seq2seq.weights[2] !== "72%" || !seq2seq.note.includes("cat")) failures.push("Attention 对齐状态异常");
if (seq2seq.bridge.trim() !== "Σ αᵢhᵢ") failures.push("Attention context 标签异常");
if (seq2seq.keyboardSelected !== "seq2seq" || seq2seq.keyboardVisible !== "seq2seq") failures.push("实验 tab 键盘导航异常");
if (!mobile.menuVisible || mobile.menuOpen !== "true") failures.push("移动导航异常");
if (exceptions.length) failures.push(`浏览器异常：${exceptions.join(" | ")}`);

if (failures.length) {
  console.error(`\\nFAIL\\n- ${failures.join("\\n- ")}`);
  process.exitCode = 1;
} else {
  console.log("\\nPASS language-model-history browser regression");
}

socket.close();