// @vitest-environment jsdom
/**
 * 资源卡的棋盘格底必须由**这张图真实的 alpha** 决定，而不是「预览分支是图片」。
 *
 * 现场缺陷（验收截图）：所有 PNG/JPEG 卡一律铺 CSS 棋盘格，于是「真透明底」与
 * 「AI 把棋盘格画进像素里」在卡面上完全同形，验收时无法区分两者。
 *
 * 本文件把整条链路钉住：
 * 1. 真的渲染 `ProjectDevelopmentView`，用假的 `read_local_project_image_preview`
 *    返回原生头部判据 `hasAlpha`，断言卡片根节点的 `data-preview-has-alpha`；
 * 2. 把真实 DOM 上的 `data-preview-kind` / `data-preview-has-alpha` 喂给
 *    `styles.css` 的声明级层叠求值，断言只有真透明卡片的 `.game-resource-card-visual`
 *    最终生效声明里才有棋盘格（判据取 `background-size: 16px 16px` 与渐变层）。
 *
 * 为什么不用 `getComputedStyle(visual).backgroundImage`：jsdom 不加载样式表，且本仓库
 * 测试环境的 cssstyle 解析不了渐变 —— 实测把 `background: linear-gradient(...)` 与
 * `background-image: linear-gradient(...)` 写进 `<style>` 后，`getComputedStyle` 的
 * `backgroundImage` 恒为 `''`（连 `background` 都退化成 `rgba(0, 0, 0, 0)`）。
 * 因此沿用本仓库既有口径（见 `resourceCardCurrentVersionStyle.test.ts`、`styleCascade.ts`）：
 * 在源文件声明上按真实层叠求值，肉眼效果留给真机确认。
 */
import type { GameCreationAppManifest } from '../../../packages/shared/src/contracts/gameCreationApp';
import {
  act,
  createGameCreationAppManifest,
  describe,
  expect,
  findResourceSelectButton,
  fireEvent,
  it,
  ProjectDevelopmentView,
  React,
  readFileSync,
  render,
  resolve,
  screen,
  vi,
  waitFor,
} from './appSurface/harness';
import {
  declaration,
  parseStyleSheet,
  resolveDeclarations,
} from './styleCascade';

const PROJECT_PATH = '/tmp/workbench-preview-alpha';
const PROJECT_ID = 'workbench-preview-alpha';

/** 棋盘格底的两条判据：`background-size` 是这套底独有的档位，渐变层是像素级图案本身。 */
const CHECKERBOARD_BACKGROUND_SIZE = '16px 16px';
const CHECKERBOARD_LAYER =
  'linear-gradient(45deg, #f1ebe7 25%, transparent 25%)';
/** 无 alpha 时必须退回的卡片既有纯色底（`.game-resource-card-visual` 本体那条）。 */
const PLAIN_CARD_BACKGROUND = 'linear-gradient(145deg, #fffaf6, #f6ece6)';

function installResourceCardIntersectionObserver() {
  const instances: Array<{
    callback: IntersectionObserverCallback;
    observed: Set<Element>;
    observer: IntersectionObserver;
  }> = [];

  class ResourceCardIntersectionObserver {
    readonly root = null;
    readonly rootMargin = '160px';
    readonly thresholds = [0];
    readonly observed = new Set<Element>();

    constructor(readonly callback: IntersectionObserverCallback) {
      instances.push({
        callback,
        observed: this.observed,
        observer: this as unknown as IntersectionObserver,
      });
    }

    observe(element: Element) {
      this.observed.add(element);
    }

    unobserve(element: Element) {
      this.observed.delete(element);
    }

    disconnect() {
      this.observed.clear();
    }

    takeRecords() {
      return [];
    }
  }

  Object.defineProperty(window, 'IntersectionObserver', {
    configurable: true,
    value: ResourceCardIntersectionObserver,
  });

  return {
    triggerVisible(elements?: Element[]) {
      const instance = instances.at(-1);
      if (!instance) {
        throw new Error('resource card IntersectionObserver was not created');
      }
      const targets = elements ?? Array.from(instance.observed);
      instance.callback(
        targets.map(
          (target) =>
            ({
              target,
              isIntersecting: true,
              intersectionRatio: 1,
            }) as IntersectionObserverEntry,
        ),
        instance.observer,
      );
    },
    observedCount() {
      return instances.at(-1)?.observed.size ?? 0;
    },
  };
}

/**
 * 四张卡都是 `raster-image` 预览分支，只有**头部 alpha 判据**不同：
 * - `alpha.png`：真有 alpha 通道（PNG colorType 6）⇒ `hasAlpha: true`；
 * - `painted.png`：AI 把棋盘格画进像素里的不透明 PNG（colorType 2）⇒ `hasAlpha: false`；
 * - `photo.jpg`：JPEG 恒不透明 ⇒ `hasAlpha: false`；
 * - `unknown.png`：预览 payload 里**没有** `hasAlpha` 字段（旧原生构建 / 判据未透出）⇒ 必须与
 *   `false` 同样处理：不铺棋盘格。这条把「缺属性」与「显式 false」钉成同一档，避免出现第三种中间态。
 */
const ALPHA_PATHS = new Set(['assets/alpha.png']);
const KNOWN_ALPHA_PATHS = new Set([
  'assets/alpha.png',
  'assets/painted.png',
  'assets/photo.jpg',
]);
const LABELS = [
  'alpha.png',
  'painted.png',
  'photo.jpg',
  'unknown.png',
] as const;

function createFixtureManifest(): GameCreationAppManifest {
  const manifest = createGameCreationAppManifest(
    PROJECT_ID,
    '资源卡预览 alpha 底',
  );
  const characterAsset = (
    id: string,
    localPath: string,
    mediaType: string,
  ) => ({
    id,
    kind: 'character',
    category: 'character' as const,
    mediaType,
    localPath,
    source: { kind: 'generated' as const },
  });
  manifest.assets = [
    characterAsset('asset-alpha', 'assets/alpha.png', 'image/png'),
    characterAsset('asset-painted', 'assets/painted.png', 'image/png'),
    characterAsset('asset-photo', 'assets/photo.jpg', 'image/jpeg'),
    characterAsset('asset-unknown', 'assets/unknown.png', 'image/png'),
  ];
  return manifest;
}

function graphFor(manifest: GameCreationAppManifest) {
  const resourceIds = manifest.assets.map((asset) => `asset:${asset.id}`);
  return {
    resourceIds,
    referenceEdges: [],
    taskFlows: [],
    connectionIndex: resourceIds.map((resourceId) => ({
      resourceId,
      upstreamReferenceResourceIds: [],
      downstreamReferenceResourceIds: [],
      referenceEdgeIds: [],
      taskFlowIds: [],
    })),
    producerAssignments: [],
    dependencyDepths: resourceIds.map((resourceId) => ({
      resourceId,
      dependencyDepth: 0,
    })),
    unresolvedReferenceResourceIds: [],
    cyclicResourceIds: [],
    cyclicTaskIds: [],
    producerMappingTruncated: false,
  };
}

function installPreviewTauri(manifest: GameCreationAppManifest) {
  const invoke = vi.fn(
    async (command: string, args?: Record<string, unknown>) => {
      if (command === 'read_local_project_resource_graph') {
        return graphFor(manifest);
      }
      if (command === 'read_local_project_resource_canvas_layout') {
        return {
          schemaVersion: 'game-creator-resource-layout.v1',
          projectId: PROJECT_ID,
          mode: args?.mode,
          revision: 0,
          positions: [],
          updatedAt: 0,
        };
      }
      if (command === 'list_pending_local_project_resource_edits') {
        return [];
      }
      if (command === 'update_local_project_resource_canvas_layout') {
        return {
          status: 'updated',
          layout: {
            schemaVersion: 'game-creator-resource-layout.v1',
            projectId: PROJECT_ID,
            mode: args?.mode,
            revision: 1,
            positions: args?.positions,
            updatedAt: 1,
          },
        };
      }
      if (command === 'read_local_project_image_preview') {
        const relativePath = String(args?.relativePath ?? '');
        const isJpeg = relativePath.endsWith('.jpg');
        // 原生侧 `LocalProjectImagePreview.hasAlpha`：头部级判据，不做像素解码。
        // `unknown.png` 刻意不带该字段：缺属性必须与显式 false 同档。
        const hasAlpha = KNOWN_ALPHA_PATHS.has(relativePath)
          ? ALPHA_PATHS.has(relativePath)
          : undefined;
        return {
          path: relativePath,
          mediaType: isJpeg ? 'image/jpeg' : 'image/png',
          byteLen: 1,
          pixelWidth: 1,
          pixelHeight: 1,
          ...(hasAlpha === undefined ? {} : { hasAlpha }),
          dataUrl: isJpeg
            ? 'data:image/jpeg;base64,AA=='
            : 'data:image/png;base64,AA==',
        };
      }
      throw new Error(`unexpected invoke ${command}`);
    },
  );
  window.__TAURI__ = { core: { invoke: invoke as never } };
  return invoke;
}

async function renderedCards(manifest: GameCreationAppManifest) {
  const observer = installResourceCardIntersectionObserver();
  installPreviewTauri(manifest);
  render(
    React.createElement(ProjectDevelopmentView, {
      projectName: manifest.name,
      projectPath: PROJECT_PATH,
      manifest,
      attachments: [],
      recentRunStatus: null,
      recentRunStopReason: null,
      supervisor: React.createElement('div', null, '项目总控'),
      onHomeOpen: vi.fn(),
      onProjectsOpen: vi.fn(),
    }),
  );
  fireEvent.click(
    await screen.findByRole('button', { name: '打开角色与对象' }),
  );
  // 四张卡都渲染出来之后再等注册：观察数就是「卡片真的挂上了预览管线」的证据。
  for (const label of LABELS) {
    await findResourceSelectButton(label);
  }
  await waitFor(() => expect(observer.observedCount()).toBe(4));
  return observer;
}

function cardFor(label: string) {
  const button = document.querySelector<HTMLElement>(
    `.game-resource-card-select[aria-label*="${label}"]`,
  );
  const card = button?.closest<HTMLElement>('.game-resource-card');
  expect(card, `卡片未渲染：${label}`).not.toBeNull();
  return card!;
}

/**
 * 用**真实 DOM 上的属性**拼出这个卡面元素会命中的选择器集合，再按 styles.css 的
 * 真实层叠算最终生效声明。这样「卡片写了什么属性」与「CSS 认什么属性」之间没有中间假设。
 */
function visualDeclarationsForCard(card: HTMLElement) {
  const rules = parseStyleSheet(
    readFileSync(
      resolve(process.cwd(), 'apps/ai-game-creator-shell/src/styles.css'),
      'utf8',
    ),
  );
  const kind = card.getAttribute('data-preview-kind');
  const hasAlpha = card.getAttribute('data-preview-has-alpha');
  const selectors = ['.game-resource-card-visual'];
  if (kind) {
    selectors.push(
      `.game-resource-card[data-preview-kind='${kind}'] .game-resource-card-visual`,
    );
  }
  if (kind && hasAlpha) {
    selectors.push(
      `.game-resource-card[data-preview-kind='${kind}'][data-preview-has-alpha='${hasAlpha}'] .game-resource-card-visual`,
    );
  }
  return resolveDeclarations(rules, selectors, 1280);
}

describe('资源卡棋盘格底按真实 alpha 决定', () => {
  it('真透明 PNG 卡带 data-preview-has-alpha=true，不透明 PNG/JPEG 卡不带该属性', async () => {
    const manifest = createFixtureManifest();
    const observer = await renderedCards(manifest);
    act(() => observer.triggerVisible());
    await waitFor(() => {
      for (const label of LABELS) {
        expect(cardFor(label).getAttribute('data-preview-status')).toBe(
          'loaded',
        );
      }
    });

    // 四张卡走的是同一个预览分支：只按 kind 判定的旧口径无法区分它们，
    // 这正是本次缺陷的成因（所有 PNG/JPEG 卡一律铺棋盘格）。
    expect(
      LABELS.map((label) => cardFor(label).getAttribute('data-preview-kind')),
    ).toEqual(['raster-image', 'raster-image', 'raster-image', 'raster-image']);

    expect(cardFor('alpha.png').getAttribute('data-preview-has-alpha')).toBe(
      'true',
    );
    // 不透明卡不写属性（而不是写 'false'）：缺属性与 'false' 在样式上必须等价。
    for (const label of ['painted.png', 'photo.jpg', 'unknown.png']) {
      expect(
        cardFor(label).getAttribute('data-preview-has-alpha'),
        `${label} 不得写 data-preview-has-alpha`,
      ).toBeNull();
    }
  });

  it('真透明 PNG 卡面最终生效棋盘格底，假棋盘格的不透明 PNG/JPEG 卡退回纯色底', async () => {
    const manifest = createFixtureManifest();
    const observer = await renderedCards(manifest);
    act(() => observer.triggerVisible());
    await waitFor(() => {
      expect(cardFor('alpha.png').getAttribute('data-preview-status')).toBe(
        'loaded',
      );
    });

    const alphaDeclarations = visualDeclarationsForCard(cardFor('alpha.png'));
    expect(declaration(alphaDeclarations, 'background')).toContain(
      CHECKERBOARD_LAYER,
    );
    expect(declaration(alphaDeclarations, 'background-size')).toBe(
      CHECKERBOARD_BACKGROUND_SIZE,
    );

    for (const label of ['painted.png', 'photo.jpg', 'unknown.png']) {
      const declarations = visualDeclarationsForCard(cardFor(label));
      // 变异判据：把 CSS 的 alpha 条件去掉（退回只按 data-preview-kind），
      // 这里会重新出现 `background-size: 16px 16px` ⇒ 变红。
      expect(
        declarations.has('background-size'),
        `${label} 不该有棋盘格档位`,
      ).toBe(false);
      expect(declaration(declarations, 'background')).toBe(
        PLAIN_CARD_BACKGROUND,
      );
    }
  });

  it('透明图自身不被填底色：没有任何规则给 .game-resource-card-visual > img 声明背景', () => {
    const rules = parseStyleSheet(
      readFileSync(
        resolve(process.cwd(), 'apps/ai-game-creator-shell/src/styles.css'),
        'utf8',
      ),
    );
    const declarations = resolveDeclarations(
      rules,
      ['.game-resource-card-visual > img'],
      1280,
    );
    for (const property of [
      'background',
      'background-image',
      'background-color',
      'background-size',
    ]) {
      expect(
        declarations.has(property),
        `.game-resource-card-visual > img 不得声明 ${property}`,
      ).toBe(false);
    }
  });

  it('media-image / video 目前没有头部 alpha 判据，因此退回纯色底而不是棋盘格', () => {
    // 这是本次刻意收窄的行为：拿不到真实 alpha 时宁可不铺棋盘格，
    // 也不要用装饰性棋盘格继续冒充「透明底」。将来给这些格式补上头部判据时，
    // 这条用例必须同步改成「有判据才铺」。
    const rules = parseStyleSheet(
      readFileSync(
        resolve(process.cwd(), 'apps/ai-game-creator-shell/src/styles.css'),
        'utf8',
      ),
    );
    for (const kind of ['media-image', 'video']) {
      const declarations = resolveDeclarations(
        rules,
        [
          '.game-resource-card-visual',
          `.game-resource-card[data-preview-kind='${kind}'] .game-resource-card-visual`,
        ],
        1280,
      );
      expect(
        declarations.has('background-size'),
        `${kind} 无 alpha 判据时不得铺棋盘格`,
      ).toBe(false);
      expect(declaration(declarations, 'background')).toBe(
        PLAIN_CARD_BACKGROUND,
      );
    }
  });
});