/**
 * The study-card extras: "From your notes" (the AI's own quote, and the local
 * sentence match for decks made before quotes existed), read-aloud cards
 * (Web Speech API, with the engine stubbed so the suite stays deterministic)
 * and timed runs (the restart-able countdown in the feed chrome).
 */
import { BASE, launchBrowser, makeChecker, makePage, seed } from "./lib.mjs";

const { check, finish } = makeChecker();
const browser = await launchBrowser();

const NOTES =
  "Rayleigh scattering makes the sky blue: molecules scatter short wavelengths far more than long ones. Chlorophyll absorbs red and blue light, which is why plants look green.";

/** Two cards: one with the generator's verbatim quote, one from before that. */
const DECK = {
  id: "seed_deck",
  title: "Sky deck",
  subject: "Physics",
  summary: "Light in the atmosphere.",
  language: "English",
  sourceText: NOTES,
  difficulty: "easy",
  createdAt: 1,
  updatedAt: 1,
  attempts: 0,
  activities: [
    {
      type: "multiple_choice",
      id: "a1",
      xp: 10,
      topic: "Sky",
      question: "What colour is a clear daytime sky?",
      options: ["Blue", "Green", "Orange", "Pink"],
      correctIndex: 0,
      explanation: "Short wavelengths scatter more.",
      source: "molecules scatter short wavelengths far more than long ones",
    },
    {
      type: "flashcard",
      id: "a2",
      xp: 5,
      topic: "Sky",
      front: "What makes the sky blue?",
      back: "Rayleigh scattering",
      explanation: "Small molecules scatter short wavelengths.",
    },
  ],
};

/* 1. From your notes + read aloud --------------------------------------- */
{
  const { context, page } = await makePage(browser, { width: 1280, height: 900, deviceScaleFactor: 1 });
  await seed(page, { decks: [DECK], theme: "dark" });
  // Deterministic speech: the engine is a recorder, the utterance API is real,
  // and nothing ever fires "end" — so the button settles on its playing state.
  await page.addInitScript(() => {
    window.__spoken = [];
    window.__cancelled = 0;
    Object.defineProperty(window, "speechSynthesis", {
      configurable: true,
      value: {
        speak: (utterance) => window.__spoken.push(String(utterance.text)),
        cancel: () => {
          window.__cancelled += 1;
        },
        getVoices: () => [],
        speaking: false,
        paused: false,
      },
    });
  });
  await page.goto(`${BASE}/deck/seed_deck`, { waitUntil: "networkidle" });
  await page.waitForTimeout(1200);

  const first = page.locator("section[aria-label]").nth(0);
  const second = page.locator("section[aria-label]").nth(1);

  /* The AI's own quote: located in the stored notes, quote highlighted. */
  await first.getByRole("button", { name: "Blue" }).click();
  await page.waitForTimeout(600);
  const quoted = first.locator("[data-notes-source]");
  check("source: the feedback shows where the answer came from", await quoted.isVisible());
  check(
    "source: the quote's sentence from the notes is shown",
    ((await quoted.textContent()) ?? "").includes("Rayleigh scattering makes the sky blue"),
    ((await quoted.textContent()) ?? "").slice(0, 80),
  );
  const quotedMark = quoted.locator("mark").first();
  check(
    "source: the quote itself is the highlighted part",
    ((await quotedMark.textContent()) ?? "").includes("molecules scatter short wavelengths far more than long ones"),
    String(await quotedMark.textContent()),
  );
  const markRgb = await quotedMark.evaluate((element) => {
    const canvas = document.createElement("canvas");
    const ctx = canvas.getContext("2d");
    ctx.fillStyle = getComputedStyle(element).backgroundColor;
    ctx.fillRect(0, 0, 1, 1);
    const [r, g, b] = ctx.getImageData(0, 0, 1, 1).data;
    return { r, g, b };
  });
  check("source: the highlight is green", markRgb.g > markRgb.r + 10 && markRgb.g > markRgb.b, JSON.stringify(markRgb));
  check("source: the quote path is flagged", (await quoted.getAttribute("data-notes-quote")) === "1");

  /* Read aloud, on the flashcard that follows. */
  await first.getByRole("button", { name: "Next" }).click();
  await page.waitForTimeout(900);
  const speak = second.getByRole("button", { name: "Read aloud" }).first();
  check("speak: the card carries a read-aloud control", (await speak.count()) === 1);
  await speak.click();
  await page.waitForTimeout(300);
  check(
    "speak: the visible side is handed to the speech engine",
    ((await page.evaluate(() => window.__spoken)) ?? []).includes("What makes the sky blue?"),
    JSON.stringify(await page.evaluate(() => window.__spoken)),
  );
  check("speak: the control flips to stop", (await second.getByRole("button", { name: "Stop reading" }).count()) === 1);
  check(
    "speak: tapping the speaker does not flip the card",
    (await second.getByRole("button", { name: "Reveal the answer" }).count()) === 1,
  );
  await second.getByRole("button", { name: "Stop reading" }).click();
  await page.waitForTimeout(300);
  check("speak: stopping cancels the utterance", (await page.evaluate(() => window.__cancelled)) >= 1);
  check("speak: the control flips back", (await second.getByRole("button", { name: "Read aloud" }).count()) === 1);

  /* The local fallback: this card has no quote, so the sentence is matched. */
  await second.getByRole("button", { name: "Reveal the answer" }).click();
  await page.waitForTimeout(600);
  await second.getByRole("button", { name: /I knew it/ }).click();
  await page.waitForTimeout(800);
  const local = second.locator("[data-notes-source]");
  check("source: a deck without quotes still points at the notes", await local.isVisible());
  check(
    "source: the local match is the right sentence",
    ((await local.textContent()) ?? "").includes("Rayleigh scattering makes the sky blue"),
    ((await local.textContent()) ?? "").slice(0, 80),
  );
  check("source: the matched words are marked", (await local.locator("mark").count()) >= 1);
  check("source: the local path is flagged", (await local.getAttribute("data-notes-quote")) === "0");
  await context.close();
}

/* 2. timed runs --------------------------------------------------------- */
{
  const { context, page } = await makePage(browser, { width: 1280, height: 900, deviceScaleFactor: 1 });
  await seed(page, { decks: [DECK] });
  await page.clock.install();
  // The fake clock has no animation frames, so the browser's smooth scrolling
  // would never arrive (the feed tracks its slide from the scroll position).
  // The harness scrolls instantly; everything else is the real app.
  await page.addInitScript(() => {
    const original = Element.prototype.scrollTo;
    Element.prototype.scrollTo = function (options, y) {
      if (options && typeof options === "object") return original.call(this, { ...options, behavior: "auto" });
      return original.call(this, options, y);
    };
  });
  await page.goto(`${BASE}/deck/seed_deck`, { waitUntil: "networkidle" });
  await page.waitForTimeout(1200);

  const toggle = page.locator("[data-timed-toggle]");
  check(
    "timed: the chrome carries the toggle, off by default",
    (await toggle.count()) === 1 && (await toggle.getAttribute("aria-pressed")) === "false",
  );
  check("timed: the label names the per-card budget", /30s/.test((await toggle.textContent()) ?? ""), String(await toggle.textContent()));

  await toggle.click();
  await page.waitForTimeout(300);
  check("timed: toggled on", (await toggle.getAttribute("aria-pressed")) === "true");
  await page.clock.runFor(5000);
  await page.waitForTimeout(200);
  const afterFive = Number.parseInt((await toggle.textContent()) ?? "", 10);
  check("timed: the countdown ticks down", afterFive <= 26 && afterFive > 0, String(afterFive));
  const bar = await page.locator("[data-timed-bar]").evaluate((element) => element.getBoundingClientRect().width);
  const track = await page.locator("[data-timed-bar]").evaluate((element) => element.parentElement.getBoundingClientRect().width);
  check("timed: the countdown is drawn along the chrome", bar > 10 && bar < track, `${Math.round(bar)}/${Math.round(track)}`);

  await page.clock.runFor(26_000);
  await page.waitForTimeout(300);
  /* the feed advances a beat after the countdown hits zero */
  await page.clock.runFor(1000);
  await page.waitForTimeout(300);
  check("timed: running out tells the learner", (await page.getByText(/Time's up/).count()) >= 1);
  /* The feed's position, not the smooth-scroll animation: under the fake
     clock the browser's smooth scrolling has no frames of its own. */
  const position = await page.evaluate(() => {
    const chip = document.querySelector("header .study-chrome span.tabular-nums");
    return chip ? chip.textContent?.trim() ?? "" : "";
  });
  check("timed: the feed moves on by itself", position.startsWith("2/"), position);
  check(
    "timed: the timeout is recorded as a miss",
    (await page.locator("[data-testid=study-feed]").evaluate((element) => element.scrollTop)) > 100,
  );
  /* A fresh budget, not the exhausted card's leftover (which reads ~0). The
     window is deliberately loose at the low end: under the fake clock the
     suite's own waits advance the app's interval, and a loaded machine can
     tick a few extra seconds between the switch and this read. */
  const fresh = Number.parseInt((await toggle.textContent()) ?? "", 10);
  check("timed: the next card gets a fresh budget", fresh >= 20 && fresh <= 30, String(fresh));

  /* The second card times out too: the results screen counts the miss. */
  await page.clock.runFor(31_000);
  await page.waitForTimeout(600);
  check(
    "timed: both timeouts reach the results slide as misses",
    (await page.getByText(/You got 0 of 2 right/).count()) === 1 && (await page.getByText(/Missed items \(2\)/).count()) === 1,
  );
  await context.close();
}

await browser.close();
finish();