/**
 * Ice-scene bubbles: the glossy orbs must rise from below the bottom edge to
 * above the top edge with sway + slight scale, fade at the edges, animate only
 * transform/opacity on their own composited layers, stay behind everything,
 * park under reduced motion and while the tab is hidden, and keep the
 * per-breakpoint count (5 desktop / 3 tablet / 2 phones).
 */
import { BASE, DECK, launchBrowser, makeChecker, makePage, seed } from "./lib.mjs";

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

/** Reads the phase-1 orb's rendered state after parking its animation there.
    CSS animations render at (currentTime - delay), and the delay is negative,
    so the requested phase has to be offset by it. */
async function orbAt(page, phase) {
  return page.evaluate(async (phase) => {
    const orb = document.querySelector(".ice-orb-1");
    const animation = orb.getAnimations().find((entry) => entry.animationName === "ice-rise");
    const timing = animation.effect.getTiming();
    animation.pause();
    // Chrome ignores a negative currentTime, so wrap into the loop.
    const wanted = phase * timing.duration + (timing.delay ?? 0);
    animation.currentTime = ((wanted % timing.duration) + timing.duration) % timing.duration;
    await new Promise((resolve) => requestAnimationFrame(() => requestAnimationFrame(resolve)));
    const rect = orb.getBoundingClientRect();
    return {
      top: rect.top,
      left: rect.left,
      width: rect.width,
      opacity: Number(getComputedStyle(orb).opacity),
      viewport: window.innerHeight,
    };
  }, phase);
}

/* 1. scene contract (desktop) ---------------------------------------- */
{
  const { context, page } = await makePage(browser, { width: 1280, height: 900, deviceScaleFactor: 1 });
  await seed(page, { decks: [DECK] });
  await page.goto(BASE, { waitUntil: "networkidle" });
  await page.waitForTimeout(1200);

  const scene = await page.evaluate(() => {
    const element = document.querySelector(".ice-scene");
    const style = getComputedStyle(element);
    return {
      position: style.position,
      zIndex: style.zIndex,
      pointerEvents: style.pointerEvents,
      overflow: style.overflow,
      ariaHidden: element.getAttribute("aria-hidden"),
    };
  });
  check("scene: fixed, z-index -1, no pointer events, clipped", scene.position === "fixed" && scene.zIndex === "-1" && scene.pointerEvents === "none" && scene.overflow === "hidden");
  check("scene: hidden from assistive tech", scene.ariaHidden === "true");

  const orbs = await page.evaluate(() =>
    [...document.querySelectorAll(".ice-orb")].map((orb) => {
      const style = getComputedStyle(orb);
      return {
        animation: style.animationName,
        willChange: style.willChange,
        filter: style.filter,
        backdropFilter: style.backdropFilter || style.webkitBackdropFilter,
        duration: parseFloat(style.animationDuration),
        delay: style.animationDelay,
        opacity: Number(style.opacity),
      };
    }),
  );
  check("orbs: five on desktop, all running the rise", orbs.length === 5 && orbs.every((orb) => orb.animation === "ice-rise"));
  check("orbs: will-change transform, no filter/backdrop-filter", orbs.every((orb) => orb.willChange === "transform" && orb.filter === "none" && (orb.backdropFilter === "none" || !orb.backdropFilter)));
  check("orbs: negative delays spread them on load", orbs.every((orb) => orb.delay.startsWith("-")));
  check("orbs: own duration per pass (30-70s, 5 distinct)", orbs.every((orb) => orb.duration >= 30 && orb.duration <= 70) && new Set(orbs.map((orb) => orb.duration)).size === 5, orbs.map((orb) => orb.duration).join(","));
  check("orbs: reduced opacity token applied", orbs.every((orb) => orb.opacity > 0.3 && orb.opacity < 0.45), String(orbs[0]?.opacity));

  /* The floats layer: orbs + bubbles live in one masked wrapper that fades
     them out before the chrome bands, so none of them is sliced by a panel
     edge (see .ice-floats in globals.css). */
  const floats = await page.evaluate(() => {
    const layer = document.querySelector(".ice-floats");
    const style = layer ? getComputedStyle(layer) : null;
    return {
      children: layer ? layer.children.length : 0,
      orbs: document.querySelectorAll(".ice-floats .ice-orb").length,
      bubbles: document.querySelectorAll(".ice-floats .ice-bubble").length,
      mask: style ? style.maskImage || style.webkitMaskImage : "",
    };
  });
  check(
    "floats: orbs and bubbles ride one masked layer",
    floats.children === 23 && floats.orbs === 5 && floats.bubbles === 18,
    JSON.stringify(floats),
  );
  check("floats: the chrome bands fade the layer out", floats.mask.includes("gradient"), floats.mask.slice(0, 60));

  const keyframes = await page.evaluate(() => {
    for (const sheet of document.styleSheets) {
      try {
        for (const rule of sheet.cssRules) {
          if (rule instanceof CSSKeyframesRule && rule.name === "ice-rise") {
            return [...rule.cssRules].map((frame) => ({ offset: frame.keyText, props: [...frame.style] }));
          }
        }
      } catch {
        /* cross-origin sheet */
      }
    }
    return null;
  });
  check("keyframes: only transform + opacity animate", Boolean(keyframes) && keyframes.every((frame) => frame.props.every((prop) => prop === "transform" || prop === "opacity")), JSON.stringify(keyframes?.map((frame) => frame.props)));
  const fadeIn = keyframes?.find((frame) => frame.offset === "0%");
  const fadeOut = keyframes?.find((frame) => frame.offset === "100%");
  check("keyframes: fade to 0 at both edges", fadeIn?.props.includes("opacity") && fadeOut?.props.includes("opacity"));

  const start = await orbAt(page, 0.01);
  const lower = await orbAt(page, 0.2);
  const mid = await orbAt(page, 0.5);
  const upper = await orbAt(page, 0.8);
  const end = await orbAt(page, 0.99);
  check("rise: starts at the bottom edge, ends above the top edge", Math.abs(start.top - start.viewport) < 6 && end.top < -120, `start ${Math.round(start.top)}/${start.viewport}, end ${Math.round(end.top)}`);
  check("rise: moves upward the whole way", lower.top < start.top && mid.top < lower.top && upper.top < mid.top && end.top < upper.top);
  check("sway: swings across the path", Math.abs(mid.left - lower.left) > 30 && Math.abs(upper.left - mid.left) > 15, `${Math.round(lower.left)} → ${Math.round(mid.left)} → ${Math.round(upper.left)}`);
  check("scale: drifts slightly across the pass", end.width > start.width + 8, `${start.width.toFixed(1)} → ${end.width.toFixed(1)}`);
  check("fade: in at the bottom, out at the top, full between", start.opacity < 0.1 && mid.opacity > 0.3 && end.opacity < 0.1, `${start.opacity} / ${mid.opacity} / ${end.opacity}`);

  const layoutBefore = await page.evaluate(() => ({ width: document.documentElement.scrollWidth, height: document.documentElement.scrollHeight }));
  await page.waitForTimeout(1400);
  const layoutAfter = await page.evaluate(() => ({ width: document.documentElement.scrollWidth, height: document.documentElement.scrollHeight }));
  check("layout: no shift or scrollbar change while rising", layoutBefore.width === layoutAfter.width && layoutBefore.height === layoutAfter.height && layoutAfter.width <= 1280 + 1, JSON.stringify({ layoutBefore, layoutAfter }));

  const hit = await page.evaluate(() => {
    const point = document.elementFromPoint(window.innerWidth / 2, 6);
    return { sceneHit: point?.closest?.(".ice-scene") !== null, tag: point?.tagName ?? "" };
  });
  check("stacking: the scene never sits in front of the chrome", !hit.sceneHit, hit.tag);
  await context.close();
}

/* 2. per-breakpoint counts + phone pacing ----------------------------- */
{
  const counts = {};
  for (const width of [1280, 768, 390, 360]) {
    const { context, page } = await makePage(browser, { width, height: 800, deviceScaleFactor: 1 });
    await seed(page, { decks: [DECK] });
    await page.goto(BASE, { waitUntil: "networkidle" });
    await page.waitForTimeout(900);
    const info = await page.evaluate(() =>
      [...document.querySelectorAll(".ice-orb")]
        .filter((orb) => getComputedStyle(orb).display !== "none")
        .map((orb) => ({ duration: parseFloat(getComputedStyle(orb).animationDuration), delay: getComputedStyle(orb).animationDelay })),
    );
    counts[width] = info;
    check(`${width}px: no horizontal overflow`, await page.evaluate(() => document.documentElement.scrollWidth <= window.innerWidth + 1));
    await context.close();
  }
  check("desktop keeps 5 orbs", counts[1280].length === 5, String(counts[1280].length));
  check("tablet keeps 3 orbs", counts[768].length === 3, String(counts[768].length));
  check("phone keeps 2 orbs (fewer than before is not allowed)", counts[390].length === 2 && counts[360].length === 2, `${counts[390].length}/${counts[360].length}`);
  check("phone pacing is slower than desktop", counts[390][0].duration > counts[1280][0].duration && counts[390][1].duration > counts[1280][1].duration, `${counts[1280][0].duration}s → ${counts[390][0].duration}s`);
  check("all phone passes stay in 30-70s", counts[390].every((orb) => orb.duration >= 30 && orb.duration <= 70), counts[390].map((orb) => orb.duration).join(","));
  check("all phone delays negative", counts[390].every((orb) => orb.delay.startsWith("-")));
}

/* 3. reduced motion: static and visible ------------------------------- */
{
  const { context, page } = await makePage(browser, { reducedMotion: "reduce" });
  await seed(page, { decks: [DECK] });
  await page.goto(BASE, { waitUntil: "networkidle" });
  await page.waitForTimeout(900);
  const state = await page.evaluate(() => {
    const orb = document.querySelector(".ice-orb-1");
    const style = getComputedStyle(orb);
    const rect = orb.getBoundingClientRect();
    const floats = getComputedStyle(document.querySelector(".ice-floats"));
    return {
      animation: style.animationName,
      willChange: style.willChange,
      opacity: Number(style.opacity),
      top: rect.top,
      left: rect.left,
      mask: floats.maskImage || floats.webkitMaskImage,
    };
  });
  check("reduced motion: the floats mask is off (parked orbs keep their spots)", state.mask === "none", state.mask);
  check("reduced motion: rise removed, layer released", state.animation === "none" && state.willChange === "auto", JSON.stringify(state));
  check("reduced motion: orb visible and faded in at a static spot", state.opacity > 0.08 && state.top > 0 && state.top < 900, JSON.stringify(state));
  await page.waitForTimeout(1100);
  const after = await page.evaluate(() => {
    const rect = document.querySelector(".ice-orb-1").getBoundingClientRect();
    return { top: rect.top, left: rect.left };
  });
  check("reduced motion: no movement over a second", Math.abs(after.top - state.top) < 1 && Math.abs(after.left - state.left) < 1, `${state.top.toFixed(1)} → ${after.top.toFixed(1)}`);
  await context.close();
}

/* 4. tab hidden: everything parks ------------------------------------- */
{
  const { context, page } = await makePage(browser);
  await seed(page, { decks: [DECK] });
  await page.goto(BASE, { waitUntil: "networkidle" });
  await page.waitForTimeout(900);
  await page.evaluate(() => {
    Object.defineProperty(document, "hidden", { configurable: true, get: () => true });
    document.dispatchEvent(new Event("visibilitychange"));
  });
  await page.waitForTimeout(200);
  const paused = await page.evaluate(() => ({
    scene: document.querySelector(".ice-scene").classList.contains("ice-paused"),
    orb: getComputedStyle(document.querySelector(".ice-orb-1")).animationPlayState,
    blob: getComputedStyle(document.querySelector(".ice-blob-a")).animationPlayState,
    transform: getComputedStyle(document.querySelector(".ice-orb-1")).transform,
    top: document.querySelector(".ice-orb-1").getBoundingClientRect().top,
  }));
  check("tab hidden: scene class + orb parked", paused.scene && paused.orb === "paused", JSON.stringify(paused));
  check("tab hidden: blob drift parked too", paused.blob === "paused", paused.blob);
  check("tab hidden: parked orb keeps its frame (no jump)", paused.transform !== "none", paused.transform);
  await page.waitForTimeout(500);
  const held = await page.evaluate(() => document.querySelector(".ice-orb-1").getBoundingClientRect().top);
  check("tab hidden: parked orb does not move", Math.abs(held - paused.top) < 1, `${paused.top.toFixed(1)} → ${held.toFixed(1)}`);
  await page.evaluate(() => {
    Object.defineProperty(document, "hidden", { configurable: true, get: () => false });
    document.dispatchEvent(new Event("visibilitychange"));
  });
  await page.waitForTimeout(200);
  const running = await page.evaluate(() => ({
    scene: document.querySelector(".ice-scene").classList.contains("ice-paused"),
    orb: getComputedStyle(document.querySelector(".ice-orb-1")).animationPlayState,
  }));
  check("tab visible again: rise resumes", !running.scene && running.orb === "running", JSON.stringify(running));
  await context.close();
}

await browser.close();
finish();