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 < 70; 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/");
await screenshot("/tmp/llm-atlas-transformer-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-attention-tab]").length,
  labPanels: document.querySelectorAll("[data-attention-panel]").length,
  documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
}))()`);

const qkv = await evaluate(`(() => {
  const root = document.querySelector("[data-transformer-lab]");
  const read = () => ({
    output: root.querySelector("[data-qkv-output]").textContent,
    dimension: root.querySelector("[data-qkv-dimension-label]").textContent,
    temperature: root.querySelector("[data-qkv-temperature-label]").textContent,
    weights: [...root.querySelectorAll("[data-qkv-weight]")].map((node) => node.textContent),
  });
  const initial = read();
  const dimension = root.querySelector("[data-qkv-dimension]");
  dimension.value = "4";
  dimension.dispatchEvent(new Event("input", { bubbles: true }));
  const temperature = root.querySelector("[data-qkv-temperature]");
  temperature.value = "250";
  temperature.dispatchEvent(new Event("input", { bubbles: true }));
  const sharp = read();
  return { initial, sharp };
})()`);

const mask = await evaluate(`(() => {
  const root = document.querySelector("[data-transformer-lab]");
  root.querySelector('[data-attention-tab="mask"]').click();
  root.querySelector('[data-mask-mode="prefix"]').click();
  root.querySelector('[data-mask-query="0"]').click();
  const prefix = {
    label: root.querySelector("[data-mask-label]").textContent,
    sources: root.querySelector("[data-mask-sources]").textContent,
    allowed: root.querySelectorAll(".mask-grid i.allowed.selected-row").length,
  };
  root.querySelector('[data-mask-mode="causal"]').click();
  root.querySelector('[data-mask-query="2"]').click();
  const causal = {
    sources: root.querySelector("[data-mask-sources]").textContent,
    allowed: root.querySelectorAll(".mask-grid i.allowed.selected-row").length,
    visiblePanel: root.querySelector("[data-attention-panel]:not([hidden])").dataset.attentionPanel,
  };
  return { prefix, causal };
})()`);

const heads = await evaluate(`(() => {
  const root = document.querySelector("[data-transformer-lab]");
  root.querySelector('[data-attention-tab="heads"]').click();
  const select = root.querySelector("[data-position-mode]");
  select.value = "alibi";
  select.dispatchEvent(new Event("change", { bubbles: true }));
  return {
    kicker: root.querySelector("[data-position-kicker]").textContent,
    title: root.querySelector("[data-position-title]").textContent,
    mode: root.querySelector("[data-position-visual]").dataset.mode,
    localHeights: [...root.querySelectorAll('[data-head-bar^="local-"]')].map((node) => node.style.height),
  };
})()`);

const block = await evaluate(`(() => {
  const root = document.querySelector("[data-transformer-lab]");
  root.querySelector('[data-attention-tab="block"]').click();
  root.querySelector('[data-block-id="k3"]').click();
  const context = root.querySelector("[data-context-length]");
  context.value = "131072";
  context.dispatchEvent(new Event("input", { bubbles: true }));
  const selected = {
    family: root.querySelector("[data-block-family]").textContent,
    kv: root.querySelector("[data-block-kv]").textContent,
    path: [...root.querySelectorAll("[data-block-path] b")].map((node) => node.textContent),
    note: root.querySelector("[data-block-note]").textContent,
    context: root.querySelector("[data-context-label]").textContent,
    mha: root.querySelector('[data-cost-value="mha"]').textContent,
    kda: root.querySelector('[data-cost-value="kda"]').textContent,
  };
  const firstTab = root.querySelector('[data-attention-tab="qkv"]');
  firstTab.focus();
  firstTab.dispatchEvent(new KeyboardEvent("keydown", { key: "End", bubbles: true }));
  return {
    ...selected,
    keyboardSelected: root.querySelector('[data-attention-tab][aria-selected="true"]').dataset.attentionTab,
    keyboardVisible: root.querySelector("[data-attention-panel]:not([hidden])").dataset.attentionPanel,
  };
})()`);

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

await navigate("/");
const home = await evaluate(`(() => ({
  releaseCards: document.querySelectorAll(".release-card").length,
  firstRelease: document.querySelector(".release-card h2").textContent,
  firstHref: document.querySelector(".release-card").getAttribute("href"),
  paperCount: [...document.querySelectorAll(".hero-stats b")].map((node) => node.textContent.trim()).find((value) => value === "280"),
}))()`);

await navigate("/papers/");
const papers = await evaluate(`(() => ({
  total: document.querySelectorAll("[data-paper]").length,
  transformerVisible: (() => {
    const button = [...document.querySelectorAll("[data-filter]")].find((node) => node.textContent.includes("Transformer"));
    button?.click();
    return document.querySelectorAll("[data-paper]:not([hidden])").length;
  })(),
}))()`);

await command("Emulation.setDeviceMetricsOverride", {
  width: 390,
  height: 844,
  deviceScaleFactor: 1,
  mobile: true,
});
await navigate("/foundations/");
const mobile = await evaluate(`(() => {
  const root = document.querySelector("[data-transformer-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-attention-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-transformer-mobile.png");

const report = { overview, qkv, mask, heads, block, home, papers, mobile, exceptions };
console.log(JSON.stringify(report, null, 2));

const numeric = (value) => Number.parseFloat(value);
const failures = [];
if (!overview.title.includes("按需取信息")) failures.push("章节标题异常");
if (overview.sections !== 22 || overview.tocLinks !== 22) failures.push("章节/目录数量异常");
if (overview.paperLinks !== 40) failures.push("正式论文链不是 40 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 (qkv.initial.dimension.trim() !== "64" || qkv.sharp.dimension.trim() !== "4") failures.push("QKV 维度交互异常");
if (qkv.sharp.temperature.trim() !== "2.5×" || Math.max(...qkv.sharp.weights.map(numeric)) < 60) failures.push("QKV softmax 尖锐度没有响应");
if (mask.prefix.allowed !== 3 || !mask.prefix.sources.includes("那只")) failures.push("Prefix mask 前缀区异常");
if (mask.causal.allowed !== 3 || mask.causal.visiblePanel !== "mask") failures.push("Causal mask 可见性异常");
if (heads.mode !== "alibi" || !heads.kicker.includes("LINEAR BIASES")) failures.push("位置方案切换异常");
if (new Set(heads.localHeights).size < 2) failures.push("多头权重视图没有分化");
if (block.family.trim() !== "Hybrid MoE" || !block.kv.includes("3 KDA : 1 Gated MLA")) failures.push("K3 Block 合同异常");
if (!block.path.some((step) => step.includes("KDA × 3")) || !block.note.includes("AttnRes")) failures.push("K3 Block 路径异常");
if (block.context.trim() !== "128K" || numeric(block.mha) !== 400 || numeric(block.kda) !== 1) failures.push("KV 成本缩放异常");
if (block.keyboardSelected !== "block" || block.keyboardVisible !== "block") failures.push("实验 tab 键盘导航异常");
if (home.releaseCards !== 10 || !home.firstRelease.includes("DPO 没有") || home.firstHref !== "/post-training/alignment/") failures.push("首页 Transformer 首发入口异常");
if (home.paperCount !== "280" || papers.total !== 280 || papers.transformerVisible < 30) failures.push("论文库或首页论文数量异常");
if (!mobile.menuVisible || mobile.menuOpen !== "true" || mobile.tabs !== 4) failures.push("移动端导航或实验异常");
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 transformer browser regression");
}

socket.close();