// React UI against the fake OpenAI-compatible model (tests/mock_llm.py): model badge + chat mode text, busy reply with
// retry button (never rule-based answers), quota badge, rate-limit toast, and a model-sent set_theme that the server sanitised. No real model calls.
// Usage: NODE_PATH=<dir with puppeteer-core> node tests/fake_model_browser.js <mock-model> <busy-chain> <daily-quota> <rate-limited> <local> <mock-url>
const puppeteer = require("puppeteer-core");
const [OK, BUSY, DAILY, RL, LOCAL, MOCK] = process.argv.slice(2, 8);
const results = [];
const check = (name, ok, d = "") => { results.push(!!ok); console.log((ok ? "PASS " : "FAIL ") + name + (d ? `  [${d}]` : "")); };
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

(async () => {
  const browser = await puppeteer.launch({ executablePath: process.env.CHROME || "/usr/bin/google-chrome", headless: "new",
    args: ["--no-sandbox", "--disable-gpu", "--user-data-dir=/tmp/am-fake-model-" + Date.now()] });
  const errors = [];
  const open = async (base) => {
    const ctx = await browser.createBrowserContext(); const page = await ctx.newPage();
    await page.setViewport({ width: 1280, height: 860 }); page.on("pageerror", (e) => errors.push(e.message));
    await page.goto(base + "/", { waitUntil: "networkidle0" }); await page.waitForSelector(".card", { timeout: 15000 });
    return page;
  };
  const ask = async (page, text) => {
    const n = (await page.$$(".msg.bot")).length;
    if (await page.$eval("#chat", (c) => c.classList.contains("hidden"))) await page.click("#chatLauncher");
    await page.type("#chatInput", text); await page.keyboard.press("Enter");
    await page.waitForFunction((n) => document.querySelectorAll(".msg.bot").length > n, { timeout: 30000 }, n);
    await sleep(300);
    return page.$$eval(".msg.bot", (ns) => ns[ns.length - 1].textContent);
  };
  const text = (page, sel) => page.$eval(sel, (n) => n.textContent);

  // 1) model answers: badge + chat mode show the model; tool-hydrated cards render; unknown component ignored
  let p = await open(OK);
  check("badge shows configured model on load", (await text(p, "#agentBadge")) === "AI: mock-model", await text(p, "#agentBadge"));
  await ask(p, "show me bikes");
  const mode = await text(p, "#chatMode"), badge = await text(p, "#agentBadge"), title = await p.$eval("#agentBadge", (n) => n.title);
  check("model reply: badge + chat mode", badge === "AI: mock-model" && /^AI agent · mock-model · \d+\.\ds$/.test(mode) && title === "mock-model via OpenRouter (free tier)", `${badge} | ${mode} | ${title}`);
  const titles = await p.$$eval("#stage .card h3", (ns) => ns.map((n) => n.textContent));
  check("model-chosen cards rendered through the registry", titles.length > 0 && titles.every((t) => /bike/i.test(t)) && (await p.$$("#stage > section")).length === 1, titles.join(" | "));
  // 2) model restyle: server-sanitised set_theme applied; HTML in copy rendered as text; customCss scoped
  const reply = await ask(p, "make the background a sunset gradient");
  const st = await p.evaluate(() => ({ bg: getComputedStyle(document.body).backgroundImage, img: !!document.querySelector("#headline img"),
    h: document.getElementById("headline").textContent, css: document.getElementById("user-css").textContent,
    toast: [...document.querySelectorAll("#toasts .toast")].map((t) => t.textContent).join("|"), ls: JSON.parse(localStorage.getItem("am_theme_v1") || "{}") }));
  check("model set_theme applied (gradient, toast, saved)", /gradient/.test(st.bg) && /Look updated/.test(st.toast) && st.ls.background, st.bg.slice(0, 60));
  check("model copy/CSS sanitised in the page", !st.img && /Sunset/.test(st.h) && !/</.test(st.h) && /@layer user/.test(st.css) && /#page/.test(st.css) && !/@import|position/.test(st.css), st.css.replace(/\s+/g, " ").slice(0, 90));
  check("no internal ids in the model reply", !/lst_/.test(reply), reply);
  // 3) every model rate-limited -> honest busy message with a retry button (no rule-based answer, no cards)
  p = await open(BUSY);
  const cards0 = await p.$$eval("#stage .card h3", (ns) => ns.map((n) => n.textContent).join("|"));
  const busy = await ask(p, "show me bikes");
  check("busy reply + retry button, nothing rendered by rules",
    /^The assistant is busy, please try again in a moment\./.test(busy) && (await p.$$(".msg.bot.busy .retryBtn")).length === 1 &&
    (await p.$$eval("#stage .card h3", (ns) => ns.map((n) => n.textContent).join("|"))) === cards0,
    `${busy} | ${await text(p, "#agentBadge")} | ${await text(p, "#chatMode")}`);
  check("busy badge + chat mode text", (await text(p, "#agentBadge")) === "AI: busy" && /^Assistant busy/.test(await text(p, "#chatMode")),
    `${await text(p, "#agentBadge")} | ${await text(p, "#chatMode")}`);
  const calls = async () => { const c = (await (await fetch(MOCK)).json()).calls; return (c["busy-model"] || 0) + (c["busy-model-2"] || 0); };
  const c0 = await calls();
  const users0 = (await p.$$(".msg.user")).length;
  await p.click(".msg.bot.busy .retryBtn");
  await p.waitForFunction(() => !document.querySelector(".msg.sys") && document.querySelectorAll(".msg.bot.busy").length === 1, { timeout: 30000 });
  await sleep(300);
  check("Retry resends the same message (one busy message left, no duplicate user bubble)",
    (await calls()) === c0 + 1 && (await p.$$(".msg.user")).length === users0 && (await p.$$(".msg.bot.busy")).length === 1, `calls ${c0} -> ${await calls()}`);
  // 4) daily quota used up, no local model -> busy reply; after reload the badge says the quota is used up
  p = await open(DAILY);
  check("quota used up -> busy reply", /^The assistant is busy/.test(await ask(p, "show me bikes")));
  await p.reload({ waitUntil: "networkidle0" }); await sleep(300);
  check("quota badge after reload", (await text(p, "#agentBadge")) === "AI: quota used up" && /resets/.test(await p.$eval("#agentBadge", (n) => n.title)), await text(p, "#agentBadge"));
  // 5) per-IP rate limit -> warning toast
  p = await open(RL);
  await ask(p, "show me bikes"); await ask(p, "show me bikes");
  const toasts = await p.$$eval("#toasts .toast.warn", (ns) => ns.map((n) => n.textContent));
  check("rate-limit warning toast", toasts.some((t) => /quickly/.test(t)), toasts.join("|"));

  // 6) hosted quota used up -> the local model answers; badge says so honestly
  if (LOCAL) {
    p = await open(LOCAL);
    await ask(p, "show me bikes");
    const lb = await text(p, "#agentBadge"), lm = await text(p, "#chatMode");
    check("local model badge + chat mode", lb === "Local model (local-model)" && /^Local model · local-model · \d+\.\ds$/.test(lm) && (await p.$$("#stage .card")).length > 0, `${lb} | ${lm}`);
    await p.reload({ waitUntil: "networkidle0" }); await sleep(300);
    check("after reload (quota used up) the badge shows the local model", (await text(p, "#agentBadge")) === "Local model (local-model)", await text(p, "#agentBadge"));
  }

  check("no page JS errors", errors.length === 0, errors.join("; "));
  await browser.close();
  const passed = results.filter(Boolean).length;
  console.log(`\n${passed}/${results.length} passed`);
  process.exit(passed === results.length ? 0 : 1);
})().catch((e) => { console.error(e); process.exit(2); });