import fs from 'node:fs';
import path from 'node:path';

import { describe, expect, it } from 'vitest';

function readIndexCss() {
  return fs.readFileSync(path.resolve(process.cwd(), 'src/index.css'), 'utf8');
}

function readPlatformThemeCss() {
  return fs.readFileSync(
    path.resolve(process.cwd(), 'packages/shared/src/theme.css'),
    'utf8',
  );
}

function getCssBlock(source: string, selector: string) {
  const selectorIndex = source.indexOf(selector);
  expect(
    selectorIndex,
    `${selector} should exist in src/index.css`,
  ).toBeGreaterThanOrEqual(0);

  const openBraceIndex = source.indexOf('{', selectorIndex);
  expect(
    openBraceIndex,
    `${selector} should open a CSS block`,
  ).toBeGreaterThanOrEqual(0);

  let depth = 0;
  for (let index = openBraceIndex; index < source.length; index += 1) {
    const char = source[index];
    if (char === '{') {
      depth += 1;
    } else if (char === '}') {
      depth -= 1;
      if (depth === 0) {
        return source.slice(openBraceIndex + 1, index);
      }
    }
  }

  throw new Error(`${selector} block is not closed`);
}

describe('index stylesheet unread dots', () => {
  it('keeps creation home featured assets in a sequential responsive masonry layout', () => {
    const css = readIndexCss();
    const waterfallBlock = getCssBlock(
      css,
      '.creation-landing__asset-waterfall',
    );
    const masonryBlock = getCssBlock(
      css,
      '.creation-landing__asset-waterfall--masonry',
    );
    const masonryCardBlock = getCssBlock(
      css,
      '.creation-landing__asset-waterfall--masonry > .creation-landing__asset-card',
    );
    const cardBlock = getCssBlock(css, '\n.creation-landing__asset-card {');
    const tabletQueryIndex = css.indexOf('@media (max-width: 900px)');
    const mobileQueryIndex = css.indexOf('@media (max-width: 560px)');

    expect(tabletQueryIndex).toBeGreaterThanOrEqual(0);
    expect(mobileQueryIndex).toBeGreaterThanOrEqual(0);
    const tabletWaterfallBlock = getCssBlock(
      css.slice(tabletQueryIndex),
      '.creation-landing__asset-waterfall',
    );
    const mobileWaterfallBlock = getCssBlock(
      css.slice(mobileQueryIndex),
      '.creation-landing__asset-waterfall',
    );

    expect(waterfallBlock).toContain('display: grid;');
    expect(waterfallBlock).toContain(
      'grid-template-columns: repeat(3, minmax(0, 1fr));',
    );
    expect(waterfallBlock).toContain('grid-auto-flow: row;');
    expect(waterfallBlock).toContain('gap: 0.92rem;');
    expect(waterfallBlock).toContain('align-items: start;');
    expect(waterfallBlock).not.toContain('column-count');
    expect(masonryBlock).toContain('position: relative;');
    expect(masonryBlock).toContain('display: block;');
    expect(masonryCardBlock).toContain('position: absolute;');
    expect(masonryCardBlock).toContain('box-sizing: border-box;');
    expect(cardBlock).toContain('display: block;');
    expect(cardBlock).toContain('margin: 0;');
    expect(cardBlock).toContain('align-self: start;');
    expect(cardBlock).not.toContain('break-inside');
    expect(tabletWaterfallBlock).toContain(
      'grid-template-columns: repeat(2, minmax(0, 1fr));',
    );
    expect(tabletWaterfallBlock).not.toContain('column-count');
    expect(mobileWaterfallBlock).toContain('grid-template-columns: 1fr;');
    expect(mobileWaterfallBlock).not.toContain('column-count');
  });

  it('keeps icon generator decoration from overriding the shared generating animation', () => {
    const css = readIndexCss();
    const generatingBlock = getCssBlock(
      css,
      '.image-canvas-editor__generation-frame--generating',
    );
    const generatingScanBlock = getCssBlock(
      css,
      '.image-canvas-editor__generation-frame--generating::before',
    );
    const iconBlock = getCssBlock(
      css,
      '.image-canvas-editor__generation-frame--icon:not(\n    .image-canvas-editor__generation-frame--generating\n  )',
    );
    const iconDecorationBlock = getCssBlock(
      css,
      '.image-canvas-editor__generation-frame--icon:not(\n    .image-canvas-editor__generation-frame--generating\n  )::before,\n.image-canvas-editor__generation-frame--icon:not(\n    .image-canvas-editor__generation-frame--generating\n  )::after',
    );

    expect(generatingBlock).toContain('cursor: progress;');
    expect(generatingScanBlock).toContain(
      'animation: image-canvas-generation-scan',
    );
    expect(iconBlock).toContain('background: linear-gradient(');
    expect(iconDecorationBlock).toContain('width: 42%;');
    expect(css).not.toContain(
      '.image-canvas-editor__generation-frame--icon::before,\n.image-canvas-editor__generation-frame--icon::after',
    );
  });

  it('keeps image canvas loading shimmer clipped inside media frames', () => {
    const css = readIndexCss();
    const loadingBlock = getCssBlock(
      css,
      '.project-gallery__canvas-cover-loading,\n.image-canvas-editor__layer-image-loading',
    );
    const shimmerBlock = getCssBlock(
      css,
      '.project-gallery__canvas-cover-loading::before,\n.image-canvas-editor__layer-image-loading::before',
    );
    const keyframesBlock = getCssBlock(
      css,
      '@keyframes image-canvas-generation-scan',
    );

    expect(loadingBlock).toContain('overflow: hidden;');
    expect(loadingBlock).toContain('background: rgba(226, 232, 240, 0.72);');
    expect(loadingBlock).not.toContain(
      'animation: image-canvas-generation-scan',
    );

    expect(shimmerBlock).toContain('left: -64%;');
    expect(shimmerBlock).toContain('width: 64%;');
    expect(shimmerBlock).toContain('animation: image-canvas-generation-scan');
    expect(shimmerBlock).toContain('will-change: transform;');

    expect(keyframesBlock).toContain('translateX(-100%)');
    expect(keyframesBlock).toContain('translateX(260%)');
  });

  it('keeps creation home primary rail styling separate from active tab styling', () => {
    const css = readIndexCss();

    expect(css).not.toContain(
      '.platform-desktop-shell--workbench .platform-desktop-rail__button--primary .platform-desktop-rail__icon-shell,\n.platform-desktop-shell--workbench .platform-desktop-rail__button--active .platform-desktop-rail__icon-shell',
    );
    expect(css).not.toContain(
      '.platform-desktop-shell--workbench .platform-desktop-rail__button--primary .platform-desktop-rail__label,\n.platform-desktop-shell--workbench .platform-desktop-rail__button--active .platform-desktop-rail__label',
    );
    expect(css).toContain(
      '.platform-desktop-rail__button--active .platform-desktop-rail__icon-shell',
    );
    expect(css).toContain(
      '.platform-desktop-rail__button--active .platform-desktop-rail__label',
    );
  });

  it('hides the outer page scrollbar without changing inner scroll helpers', () => {
    const css = readIndexCss();

    const rootBlock = getCssBlock(css, 'html,\nbody,\n#root');
    expect(rootBlock).toContain('overflow-x: hidden;');
    expect(rootBlock).toContain('-ms-overflow-style: none;');
    expect(rootBlock).toContain('scrollbar-width: none;');
    expect(css).toContain(
      'html,\nbody,\n#root,\n.platform-viewport-shell,\n.platform-tab-panel,\n.platform-page-stage,\n.unified-creation-page,\n.platform-work-detail__scroll',
    );

    const webkitRootBlock = getCssBlock(
      css,
      'html::-webkit-scrollbar,\nbody::-webkit-scrollbar,\n#root::-webkit-scrollbar',
    );
    expect(webkitRootBlock).toContain('display: none;');
    expect(webkitRootBlock).toContain('width: 0;');
    expect(webkitRootBlock).toContain('height: 0;');
    expect(css).toContain('.platform-viewport-shell::-webkit-scrollbar');
    expect(css).toContain('.platform-tab-panel::-webkit-scrollbar');
    expect(css).toContain('.platform-page-stage::-webkit-scrollbar');
    expect(css).toContain('.unified-creation-page::-webkit-scrollbar');
    expect(css).toContain('.platform-work-detail__scroll::-webkit-scrollbar');
    expect(css).toContain('.creation-home-stage--landing');
    expect(css).toContain('scrollbar-width: thin;');
    expect(css).toContain(
      '.creation-home-stage--landing\n  .platform-desktop-shell--workbench\n  #platform-tab-panel-create::-webkit-scrollbar',
    );

    expect(css).toContain('.scrollbar-hide');
    expect(css).toContain('::-webkit-scrollbar-thumb');
  });

  it('uses the platform fill for root background exposed by mobile keyboard shift', () => {
    const css = readIndexCss();

    const keyboardRootBlock = getCssBlock(
      css,
      "html[data-mobile-keyboard-open='true'],\nhtml[data-mobile-keyboard-open='true'] body,\nhtml[data-mobile-keyboard-open='true'] #root",
    );
    expect(keyboardRootBlock).toContain('--platform-keyboard-exposed-fill');
    expect(keyboardRootBlock).toContain('#fffdf9');
    expect(keyboardRootBlock).not.toContain('#0a0a0a');
  });

  it('does not globally transform the platform shell while the mobile keyboard is open', () => {
    const css = readIndexCss();

    const platformShellBlock = getCssBlock(
      css,
      '.platform-viewport-shell {\n  height',
    );
    expect(platformShellBlock).toContain('--platform-layout-viewport-height');
    expect(platformShellBlock).not.toContain('translate3d');
    expect(platformShellBlock).not.toContain(
      '--platform-keyboard-focus-offset',
    );
  });

  it('uses warm brown tokens for draft unread markers instead of red literals', () => {
    const css = readIndexCss();
    const themeCss = readPlatformThemeCss();

    expect(themeCss).toContain('--platform-unread-dot-fill: #8b5a3d;');
    expect(themeCss).toContain(
      '--platform-unread-dot-glow: rgba(139, 90, 61, 0.34);',
    );
    expect(themeCss).toContain('--platform-unread-dot-fill: #d6a27c;');
    expect(themeCss).toContain(
      '--platform-unread-dot-glow: rgba(214, 162, 124, 0.24);',
    );

    for (const selector of [
      '.creation-work-card__unread-dot',
      '.platform-nav-unread-dot',
    ]) {
      const block = getCssBlock(css, selector);

      expect(block).toContain('background: var(--platform-unread-dot-fill);');
      expect(block).toContain('var(--platform-unread-dot-glow)');
      expect(block).not.toContain('#b64a35');
      expect(block).not.toContain('rgba(239, 68, 68');
    }
  });

  it('keeps platform font overrides after branded title typography', () => {
    const css = readIndexCss();
    const themeCss = readPlatformThemeCss();
    const titleRuleIndex = css.indexOf('.selection-hero-brand__title');
    const platformThemeRuleIndex = css.indexOf(
      '.platform-theme,\n.platform-theme *',
    );

    expect(titleRuleIndex).toBeGreaterThanOrEqual(0);
    expect(platformThemeRuleIndex).toBeGreaterThan(titleRuleIndex);
    expect(getCssBlock(css, '.platform-theme,\n.platform-theme *')).toContain(
      'font-family: var(--platform-font-family) !important;',
    );
    expect(themeCss).not.toContain('.platform-theme,\n.platform-theme *');
  });

  it('keeps the creation shelf share button on a visible surface', () => {
    const css = readIndexCss();
    const block = getCssBlock(css, '.creation-work-card__quick-action-button');

    expect(block).toContain('border: 1px solid');
    expect(block).toContain('background: color-mix(');
    expect(block).toContain('var(--platform-neutral-bg)');
    expect(block).toContain('var(--platform-cool-bg)');
    expect(block).not.toContain('background: transparent;');
  });

  it('keeps mini program recommend runtime inside a share snapshot safe area', () => {
    const css = readIndexCss();
    const block = getCssBlock(
      css,
      "html[data-wechat-mini-program-runtime='true']\n    .platform-recommend-runtime-panel",
    );

    expect(block).toContain('max-height: min(76dvh, 42rem);');
    expect(block).toContain('transform: scale(0.88);');
    expect(block).toContain('transform-origin: center;');
  });

  it('keeps the creation shelf point incentive action button compact', () => {
    const css = readIndexCss();
    const surfaceBlock = getCssBlock(
      css,
      '.creation-work-card-incentive__button.platform-button',
    );
    const compactButtonBlock = getCssBlock(
      css,
      '.creation-work-card-incentive__button.platform-button {\n  display: inline-flex;',
    );
    const mobileQueryIndex = css.indexOf('@media (max-width: 639px)');
    const mobileSelectorIndex = css.indexOf(
      '.creation-work-card-incentive__button.platform-button',
      mobileQueryIndex,
    );

    expect(surfaceBlock).toContain('border: 1px solid');
    expect(surfaceBlock).toContain('background: color-mix(');
    expect(compactButtonBlock).toContain('min-height: 2.55rem;');
    expect(compactButtonBlock).toContain('font-size: 0.68rem;');
    expect(mobileSelectorIndex).toBeGreaterThanOrEqual(0);
  });
});

describe('index stylesheet image canvas asset selection', () => {
  it('bounds the raised mobile selection sidebar by the short viewport', () => {
    const css = readIndexCss();
    const mobileQueryIndex = css.indexOf('@media (max-width: 760px)');
    expect(mobileQueryIndex).toBeGreaterThanOrEqual(0);

    const selectionSidebarBlock = getCssBlock(
      css.slice(mobileQueryIndex),
      '.image-canvas-editor__sidebar--asset-selection',
    );
    expect(selectionSidebarBlock).toContain(
      'height: clamp(14rem, 62dvh, 21rem);',
    );
    expect(selectionSidebarBlock).toContain('max-height: 62dvh;');
    expect(selectionSidebarBlock).not.toContain('clamp(19rem');
  });
});

describe('index stylesheet draft mobile cards', () => {
  it('disables long-press text selection on the whole mobile draft tab', () => {
    const css = readIndexCss();
    const mobileQueryIndex = css.indexOf('@media (max-width: 639px)');
    expect(mobileQueryIndex).toBeGreaterThanOrEqual(0);

    const draftPanelSelector =
      '#platform-tab-panel-saves,\n  #platform-tab-panel-saves *';
    const draftPanelSelectorIndex = css.indexOf(
      draftPanelSelector,
      mobileQueryIndex,
    );
    expect(draftPanelSelectorIndex).toBeGreaterThanOrEqual(0);

    const draftPanelBlock = getCssBlock(css, draftPanelSelector);
    expect(draftPanelBlock).toContain('-webkit-user-select: none;');
    expect(draftPanelBlock).toContain('user-select: none;');
    expect(draftPanelBlock).toContain('-webkit-touch-callout: none;');

    const editableSelector =
      "#platform-tab-panel-saves :is(input, textarea, [contenteditable='true'])";
    const editableSelectorIndex = css.indexOf(
      editableSelector,
      mobileQueryIndex,
    );
    expect(editableSelectorIndex).toBeGreaterThanOrEqual(0);

    const editableBlock = getCssBlock(css, editableSelector);
    expect(editableBlock).toContain('-webkit-user-select: text;');
    expect(editableBlock).toContain('user-select: text;');
    expect(editableBlock).toContain('-webkit-touch-callout: default;');
  });
});

describe('index stylesheet creation agent hero contrast', () => {
  it('keeps dark creation progress hero text light inside remap surfaces', () => {
    const css = readIndexCss();

    expect(css).toContain('.platform-remap-surface');
    expect(css).toContain('.creation-agent-hero');

    const labelBlock = getCssBlock(
      css,
      ':where(.creation-agent-hero__summary, .creation-agent-hero__progress-label)',
    );
    expect(labelBlock).toContain('rgba(255, 255, 255, 0.76) !important');

    const valueBlock = getCssBlock(css, '.creation-agent-hero__progress-value');
    expect(valueBlock).toContain('rgba(255, 255, 255, 0.92) !important');

    const hintBlock = getCssBlock(css, '.creation-agent-hero__progress-hint');
    expect(hintBlock).toContain('rgba(255, 255, 255, 0.72) !important');
  });
});

describe('index stylesheet recommend runtime cover', () => {
  it('keeps the card cover above embedded runtime and only fades it when ready', () => {
    const css = readIndexCss();

    const viewportBlock = getCssBlock(
      css,
      '.platform-recommend-runtime-viewport',
    );
    expect(viewportBlock).toContain('z-index: 1;');
    expect(viewportBlock).toContain('isolation: isolate;');

    const coverBlock = getCssBlock(css, '.platform-recommend-runtime-cover');
    expect(coverBlock).toContain('z-index: 30;');
    expect(coverBlock).toContain('isolation: isolate;');
    expect(coverBlock).not.toContain('transition: opacity');

    const loadingBlock = getCssBlock(
      css,
      '.platform-recommend-runtime-loading',
    );
    expect(loadingBlock).toContain('position: absolute;');
    expect(loadingBlock).toContain('z-index: 4;');

    const loadingAnimationBlock = getCssBlock(
      css,
      '.platform-recommend-runtime-loading::before',
    );
    expect(loadingAnimationBlock).toContain(
      'animation: platform-recommend-runtime-loading 1.15s ease-in-out infinite;',
    );
    expect(css).toContain('@keyframes platform-recommend-runtime-loading');

    const hiddenCoverBlock = getCssBlock(
      css,
      '.platform-recommend-runtime-cover--hidden',
    );
    expect(hiddenCoverBlock).toContain('transition: opacity 420ms ease;');
  });
});