// #544: `setLayerProjection` must expose scene pixels beyond the old SVG
// viewport while the compositor transform is live. The outer `.stage` still
// clips the card. DOM strings and a screenshot after pointerup cannot prove
// this contract, so the oracle compares held and forced-settled pixels for the
// same camera target and counts scene pixels replaced by stage background.
import { launch, checkAll, finish } from './serve.mjs';

const { page, browser } = await launch(
  { width: 1100, height: 760 }, 1, [], { hasTouch: true },
);

const checks = {};
const diagnostics = {};
const frame = () => page.evaluate(() => new Promise((done) => requestAnimationFrame(done)));
const settle = async () => {
  await page.evaluate(async () => {
    const card = document.querySelector('houseplan-card');
    await card.updateComplete;
    await new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
  });
};
const stage = () => page.locator('houseplan-card').locator('.stage');

const resetCamera = async () => {
  await page.evaluate(async () => {
    const card = document.querySelector('houseplan-card');
    const stage = card.renderRoot.querySelector('.stage');
    const width = 300;
    card._view = {
      x: 350,
      y: 350,
      w: width,
      h: width * stage.clientHeight / stage.clientWidth,
    };
    card._zoom = 3;
    card.requestUpdate();
    await card.updateComplete;
    await new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
  });
};

const liveState = () => page.evaluate(() => {
  const card = document.querySelector('houseplan-card');
  const root = card.renderRoot;
  const scenes = [...root.querySelectorAll('[data-hp-live-viewbox]')];
  const centre = (node) => {
    const rect = node?.getBoundingClientRect();
    return rect ? [rect.left + rect.width / 2, rect.top + rect.height / 2] : null;
  };
  const stage = root.querySelector('.stage');
  return {
    view: structuredClone(card._view),
    transformed: scenes.filter((node) => node.style.transform).length,
    sceneCount: scenes.length,
    allSceneOverflowOpen: scenes.length > 0
      && scenes.every((node) => node.style.overflow === 'visible'),
    allScenePromoted: scenes.length > 0 && scenes.every((node) => node.style.transform
      && node.style.transformOrigin && node.style.willChange === 'transform'
      && node.style.overflow === 'visible'),
    allTemporaryStylesCleared: scenes.every((node) => !node.style.overflow
      && !node.style.transform && !node.style.transformOrigin && !node.style.willChange),
    marker: centre(root.querySelector('[data-hp="device"]')),
    room: centre(root.querySelector('[data-hp="room"]')),
    effects: {
      dayCycle: !!root.querySelector('.hp-day-cycle-env .hp-day-cycle-bg.active'),
      glowBases: root.querySelectorAll('.glow-base-layer .glow-base').length,
      glowPools: root.querySelectorAll('.glowlayer circle, .glow-pool').length,
      roomFills: root.querySelectorAll('.room.filled').length,
      hatchedWalls: root.querySelectorAll('.wallbody:not(.solid)[fill^="url("]').length,
      customBackground: (stage?.getAttribute('style') || '').includes('#123456'),
    },
  };
});

const backgroundRgb = async () => page.evaluate(() => {
  const stage = document.querySelector('houseplan-card').renderRoot.querySelector('.stage');
  return (getComputedStyle(stage).backgroundColor.match(/[\d.]+/g) || []).slice(0, 3).map(Number);
});

const compareCoverage = async (actual, reference, edge, background) => page.evaluate(async (input) => {
  const decode = async (base64) => {
    const image = new Image();
    image.src = `data:image/png;base64,${base64}`;
    await image.decode();
    const canvas = document.createElement('canvas');
    canvas.width = image.width;
    canvas.height = image.height;
    const context = canvas.getContext('2d');
    context.drawImage(image, 0, 0);
    return {
      width: image.width,
      height: image.height,
      data: context.getImageData(0, 0, image.width, image.height).data,
    };
  };
  const [left, right] = await Promise.all([decode(input.actual), decode(input.reference)]);
  if (left.width !== right.width || left.height !== right.height) {
    return { sameSize: false, missing: Number.POSITIVE_INFINITY, referenceScenePixels: 0 };
  }
  const nearBackground = (data, index) => input.background.every(
    (channel, offset) => Math.abs(data[index + offset] - channel) <= 5,
  );
  const inBand = (x, y) => {
    if (input.edge === 'left') return x < left.width * 0.14;
    if (input.edge === 'right') return x >= left.width * 0.86;
    if (input.edge === 'top') return y < left.height * 0.14;
    if (input.edge === 'bottom') return y >= left.height * 0.86;
    return true;
  };
  let missing = 0;
  let referenceScenePixels = 0;
  for (let y = 0; y < left.height; y += 1) {
    for (let x = 0; x < left.width; x += 1) {
      if (!inBand(x, y)) continue;
      const index = (y * left.width + x) * 4;
      const referenceIsScene = !nearBackground(right.data, index);
      if (!referenceIsScene) continue;
      referenceScenePixels += 1;
      if (nearBackground(left.data, index)) missing += 1;
    }
  }
  return { sameSize: true, missing, referenceScenePixels };
}, {
  actual: actual.toString('base64'),
  reference: reference.toString('base64'),
  edge,
  background,
});

const pointerCentre = async () => {
  const rect = await stage().boundingBox();
  if (!rect) throw new Error('stage has no bounding box');
  return { x: rect.x + rect.width / 2, y: rect.y + rect.height / 2 };
};

const preparePointerCapture = () => page.evaluate(() => {
  const stage = document.querySelector('houseplan-card').renderRoot.querySelector('.stage');
  stage.setPointerCapture = () => {};
  stage.releasePointerCapture = () => {};
});

const dispatchTouch = (type, id, x, y, buttons = type === 'pointerup' ? 0 : 1) => page.evaluate(
  ({ type, id, x, y, buttons }) => {
    const stage = document.querySelector('houseplan-card').renderRoot.querySelector('.stage');
    stage.dispatchEvent(new PointerEvent(type, {
      bubbles: true,
      composed: true,
      cancelable: true,
      pointerId: id,
      isPrimary: id % 2 === 1,
      pointerType: 'touch',
      button: type === 'pointerdown' ? 0 : -1,
      buttons,
      clientX: x,
      clientY: y,
    }));
  },
  { type, id, x, y, buttons },
);

const configureEffectMatrix = ({ dayCycle, glow }) => page.evaluate(async (variant) => {
  const card = document.querySelector('houseplan-card');
  const config = structuredClone(card._serverCfg);
  const space = config.spaces.find((item) => item.id === card._space) || config.spaces[0];
  config.settings = {
    ...(config.settings || {}),
    bg_color: '#123456',
    bg_mode: variant.dayCycle ? 'daynight' : 'static',
  };
  space.settings = {
    ...(space.settings || {}),
    bg_color: '#123456',
    bg_mode: variant.dayCycle ? 'daynight' : 'static',
    fill_mode: 'custom',
    custom_fill: { c: '#d02020', a: 1 },
    glow_enabled: variant.glow,
    show_borders: true,
  };
  card._serverCfg = config;
  card._cfgEpoch++;
  card.requestUpdate();
  await card.updateComplete;
  await new Promise((done) => setTimeout(done, 250));
}, { dayCycle, glow });

const runPan = async ({ name, kind, dx, dy, edge, parity = false, effects = null }) => {
  await resetCamera();
  await preparePointerCapture();
  const origin = await pointerCentre();
  const before = parity ? await liveState() : null;
  if (kind === 'mouse') {
    await page.mouse.move(origin.x, origin.y);
    await page.mouse.down();
    await page.mouse.move(origin.x + dx * 0.18, origin.y + dy * 0.18);
    await frame();
    await page.mouse.move(origin.x + dx, origin.y + dy);
  } else {
    await dispatchTouch('pointerdown', 701, origin.x, origin.y);
    await dispatchTouch('pointermove', 701, origin.x + dx * 0.18, origin.y + dy * 0.18);
    await frame();
    await dispatchTouch('pointermove', 701, origin.x + dx, origin.y + dy);
  }
  await frame();
  const immediateState = await liveState();
  const immediate = await stage().screenshot({ animations: 'disabled' });
  await page.waitForTimeout(160);
  const heldState = await liveState();
  const held = await stage().screenshot({ animations: 'disabled' });
  if (kind === 'mouse') await page.mouse.up();
  else await dispatchTouch('pointerup', 701, origin.x + dx, origin.y + dy, 0);
  await settle();
  const settledState = await liveState();
  const reference = await stage().screenshot({ animations: 'disabled' });
  const background = await backgroundRgb();
  const immediateCoverage = await compareCoverage(immediate, reference, edge, background);
  const heldCoverage = await compareCoverage(held, reference, edge, background);
  const parityPx = parity && before?.marker && before?.room
    && immediateState.marker && immediateState.room
    ? Math.max(
      Math.abs((immediateState.marker[0] - before.marker[0])
        - (immediateState.room[0] - before.room[0])),
      Math.abs((immediateState.marker[1] - before.marker[1])
        - (immediateState.room[1] - before.room[1])),
    )
    : null;
  diagnostics[name] = {
    immediateCoverage,
    heldCoverage,
    transformed: immediateState.transformed,
    heldTransformed: heldState.transformed,
    sceneCount: immediateState.sceneCount,
    overflowImmediate: immediateState.allSceneOverflowOpen,
    overflowHeld: heldState.allSceneOverflowOpen,
    promotedImmediate: immediateState.allScenePromoted,
    promotedHeld: heldState.allScenePromoted,
    targetStableWhileHeld: JSON.stringify(immediateState.view) === JSON.stringify(heldState.view),
    temporaryStylesCleared: settledState.allTemporaryStylesCleared,
    effectsImmediate: immediateState.effects,
    effectsHeld: heldState.effects,
    parityPx,
  };
  checks[`${name}ImmediateCoverage`] = immediateCoverage.sameSize
    && immediateCoverage.referenceScenePixels > 500 && immediateCoverage.missing === 0;
  checks[`${name}HeldCoverage`] = heldCoverage.sameSize
    && heldCoverage.referenceScenePixels > 500 && heldCoverage.missing === 0;
  checks[`${name}UsesTemporaryOverflow`] = immediateState.allScenePromoted
    && heldState.allScenePromoted
    && settledState.allTemporaryStylesCleared;
  checks[`${name}TargetStableWhileHeld`] = diagnostics[name].targetStableWhileHeld;
  if (effects) {
    const expected = (sample) => sample.roomFills > 0 && sample.hatchedWalls > 0
      && sample.customBackground
      && sample.dayCycle === effects.dayCycle
      && (effects.glow
        ? sample.glowPools > 0
        : sample.glowPools === 0);
    checks[`${name}EffectsVisible`] = expected(immediateState.effects)
      && expected(heldState.effects);
  }
  if (parity) checks[`${name}MarkerParity`] = parityPx !== null && parityPx <= 1;
};

const runTouchZoomOut = async ({ name }) => {
  await resetCamera();
  await preparePointerCapture();
  const origin = await pointerCentre();
  const beforeZoom = await page.evaluate(() => document.querySelector('houseplan-card')._zoom);
  await dispatchTouch('pointerdown', 711, origin.x - 80, origin.y);
  await dispatchTouch('pointerdown', 712, origin.x + 80, origin.y);
  await dispatchTouch('pointermove', 711, origin.x - 76, origin.y);
  await dispatchTouch('pointermove', 712, origin.x + 76, origin.y);
  await frame();
  await dispatchTouch('pointermove', 711, origin.x - 68, origin.y);
  await dispatchTouch('pointermove', 712, origin.x + 68, origin.y);
  await frame();
  const immediateState = await liveState();
  const immediate = await stage().screenshot({ animations: 'disabled' });
  await page.waitForTimeout(160);
  const heldState = await liveState();
  const held = await stage().screenshot({ animations: 'disabled' });
  await dispatchTouch('pointerup', 711, origin.x - 68, origin.y, 0);
  await dispatchTouch('pointerup', 712, origin.x + 68, origin.y, 0);
  await settle();
  const settledState = await liveState();
  const reference = await stage().screenshot({ animations: 'disabled' });
  const background = await backgroundRgb();
  const immediateCoverage = await compareCoverage(immediate, reference, 'all', background);
  const heldCoverage = await compareCoverage(held, reference, 'all', background);
  const afterZoom = await page.evaluate(() => document.querySelector('houseplan-card')._zoom);
  diagnostics[name] = {
    beforeZoom,
    afterZoom,
    immediateCoverage,
    heldCoverage,
    transformed: immediateState.transformed,
    heldTransformed: heldState.transformed,
    overflowImmediate: immediateState.allSceneOverflowOpen,
    overflowHeld: heldState.allSceneOverflowOpen,
    promotedImmediate: immediateState.allScenePromoted,
    promotedHeld: heldState.allScenePromoted,
    targetStableWhileHeld: JSON.stringify(immediateState.view) === JSON.stringify(heldState.view),
    temporaryStylesCleared: settledState.allTemporaryStylesCleared,
  };
  checks[`${name}ActuallyZoomsOut`] = afterZoom < beforeZoom;
  checks[`${name}ImmediateCoverage`] = immediateCoverage.sameSize
    && immediateCoverage.referenceScenePixels > 5000 && immediateCoverage.missing === 0;
  checks[`${name}HeldCoverage`] = heldCoverage.sameSize
    && heldCoverage.referenceScenePixels > 5000 && heldCoverage.missing === 0;
  checks[`${name}UsesTemporaryOverflow`] = immediateState.allScenePromoted
    && heldState.allScenePromoted
    && settledState.allTemporaryStylesCleared;
  checks[`${name}TargetStableWhileHeld`] = diagnostics[name].targetStableWhileHeld;
};

// #579: observe the actual style attribute through several budget refreshes.
// Starting the observer after the first promoted frame excludes the legitimate
// initial style construction; from that point until pointerup every oldValue
// must already describe the same promoted compositor lifecycle.
const runStablePromotion = async () => {
  await resetCamera();
  await preparePointerCapture();
  const origin = await pointerCentre();
  await dispatchTouch('pointerdown', 721, origin.x - 80, origin.y);
  await dispatchTouch('pointerdown', 722, origin.x + 80, origin.y);
  await dispatchTouch('pointermove', 721, origin.x - 90, origin.y);
  await dispatchTouch('pointermove', 722, origin.x + 90, origin.y);
  await frame();
  const initial = await liveState();
  await page.evaluate(() => {
    const card = document.querySelector('houseplan-card');
    const scenes = [...card.renderRoot.querySelectorAll('[data-hp-live-viewbox]')];
    const records = [];
    const observer = new MutationObserver((batch) => records.push(...batch));
    for (const scene of scenes) observer.observe(scene, {
      attributes: true, attributeFilter: ['style', 'viewBox'], attributeOldValue: true,
    });
    window.__hp579Promotion = { observer, records };
  });

  // Force the exact second ownership boundary from the bug: Home Assistant or
  // another reactive input may deliver a complete Lit frame while both touch
  // contacts are still held. Waiting for incidental fixture activity made the
  // mutation witness timing-dependent on slower Linux runners.
  await page.evaluate(async () => {
    const card = document.querySelector('houseplan-card');
    card.requestUpdate();
    await card.updateComplete;
  });
  await frame();

  for (const distance of [112, 72, 118]) {
    await page.waitForTimeout(110);
    await dispatchTouch('pointermove', 721, origin.x - distance, origin.y);
    await dispatchTouch('pointermove', 722, origin.x + distance, origin.y);
    await frame();
  }
  const active = await page.evaluate(async () => {
    await Promise.resolve();
    const card = document.querySelector('houseplan-card');
    const scenes = [...card.renderRoot.querySelectorAll('[data-hp-live-viewbox]')];
    const state = window.__hp579Promotion;
    const records = [...state.records, ...state.observer.takeRecords()];
    state.observer.disconnect();
    delete window.__hp579Promotion;
    const styleRecords = records.filter((record) => record.attributeName === 'style');
    const promoted = (text) => typeof text === 'string'
      && text.includes('overflow: visible') && text.includes('transform-origin:')
      && text.includes('will-change: transform') && text.includes('transform:');
    return {
      sceneCount: scenes.length,
      styleMutations: styleRecords.length,
      viewBoxMutations: records.filter((record) => record.attributeName === 'viewBox').length,
      demotedOldValues: styleRecords.filter((record) => !promoted(record.oldValue)).length,
      allPromoted: scenes.every((scene) => promoted(scene.getAttribute('style'))),
    };
  });
  await dispatchTouch('pointerup', 721, origin.x - 118, origin.y, 0);
  await dispatchTouch('pointerup', 722, origin.x + 118, origin.y, 0);
  await settle();
  const terminal = await liveState();
  diagnostics.stablePromotion = { initial, active, terminal };
  checks.stablePromotionStartsOnce = initial.allScenePromoted;
  checks.stablePromotionSurvivesRefresh = active.sceneCount > 0 && active.allPromoted
    && active.demotedOldValues === 0;
  // The forced Lit commit contributes one deliberate anchor write per scene;
  // subtract it before judging the ordinary 100 ms / 15% refresh budget.
  const budgetedViewBoxMutations = active.viewBoxMutations - active.sceneCount;
  checks.stablePromotionKeepsViewBoxBudget = budgetedViewBoxMutations >= active.sceneCount * 3
    && budgetedViewBoxMutations <= active.sceneCount * 5;
  checks.stablePromotionCleansAtTerminal = terminal.allTemporaryStylesCleared;
};

await page.evaluate(async () => {
  const card = window.__card;
  const config = structuredClone(card._serverCfg);
  const space = config.spaces.find((item) => item.id === card._space) || config.spaces[0];
  const poly = [[0, 0], [1, 0], [1, 1], [0, 1]];
  space.rooms = [{
    id: 'coverage-room',
    name: 'Coverage room',
    poly,
    fill_mode: 'custom',
    fill_color: '#d02020',
    fill_opacity: 1,
  }];
  space.walls = poly.map((a, index) => ({
    key: `coverage-wall-${index}`,
    a,
    b: poly[(index + 1) % poly.length],
    cm: 15,
  }));
  config.settings = {
    ...(config.settings || {}), bg_color: '#123456', bg_mode: 'static',
  };
  space.settings = {
    ...(space.settings || {}),
    bg_color: '#123456',
    bg_mode: 'static',
    fill_mode: 'custom',
    custom_fill: { c: '#d02020', a: 1 },
    glow_enabled: false,
    show_borders: true,
  };
  card._serverCfg = config;
  card._space = space.id;
  card.requestUpdate();
  await card.updateComplete;
});
await settle();

await runPan({ name: 'flatMouseRightEdge', kind: 'mouse', dx: -65, dy: 0, edge: 'right' });
await runPan({ name: 'flatMouseLeftEdge', kind: 'mouse', dx: 65, dy: 0, edge: 'left' });
await runPan({ name: 'flatMouseBottomEdge', kind: 'mouse', dx: 0, dy: -48, edge: 'bottom' });
await runPan({ name: 'flatMouseTopEdge', kind: 'mouse', dx: 0, dy: 48, edge: 'top' });
await runPan({ name: 'flatTouchRightEdge', kind: 'touch', dx: -65, dy: 0, edge: 'right' });
await runTouchZoomOut({ name: 'flatTouchZoomOut' });
await runStablePromotion();

// #579 AC4: every combination keeps the same expensive scene effects alive
// in both the immediate and held compositor frames. The custom fill, wall
// hatch and user background stay on in all four rows of the matrix.
for (const dayCycle of [false, true]) {
  for (const glow of [false, true]) {
    await configureEffectMatrix({ dayCycle, glow });
    await runPan({
      name: `effectsDay${Number(dayCycle)}Glow${Number(glow)}`,
      kind: 'touch', dx: -65, dy: 0, edge: 'right', effects: { dayCycle, glow },
    });
  }
}

await page.evaluate(async () => {
  history.replaceState(null, '', '?hp_alpha=1#space=f1');
  dispatchEvent(new HashChangeEvent('hashchange'));
  const card = document.querySelector('houseplan-card');
  await card.updateComplete;
  await window.__hpEnsureHarnessIsoRuntime(card);
  card._setProjection('iso');
  await card.updateComplete;
  await new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
});
checks.alphaIsoEnabled = await page.evaluate(() => {
  const card = document.querySelector('houseplan-card');
  return card._effectiveProjection() === 'iso'
    && card.renderRoot.querySelector('.stage')?.getAttribute('data-hp-iso-stage') === '4';
});
await runPan({ name: 'isoMouseRightEdge', kind: 'mouse', dx: -65, dy: 0, edge: 'right', parity: true });
await runTouchZoomOut({ name: 'isoTouchZoomOut' });

await page.evaluate(async () => {
  const card = document.querySelector('houseplan-card');
  card._setProjection('flat');
  card.setConfig({ type: 'custom:houseplan-card', kiosk: true });
  await card.updateComplete;
  await new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
});
checks.kioskEnabled = await page.evaluate(() => document.querySelector('houseplan-card')._kiosk === true);
await runPan({ name: 'kioskTouchRightEdge', kind: 'touch', dx: -65, dy: 0, edge: 'right' });

checkAll(checks);
await finish(browser, { checks, diagnostics });