// @vitest-environment jsdom

import { existsSync, readFileSync } from 'node:fs';
import { dirname, relative, resolve } from 'node:path';

import { cleanup, render, screen } from '@testing-library/react';
import { afterEach, describe, expect, it } from 'vitest';

import { ImageCanvasProjectAssetPickerDialog } from '../../../src/components/image-editor/ImageCanvasProjectAssetPickerDialog';

/**
 * 「选择替换素材」弹窗在 AGC 的面板底色契约。
 *
 * 现象：AGC 资源工作台里这个弹窗的面板本体全透明，背后模糊的资源画布直接透出来。
 * 面板用的是共享 `UnifiedModal` 产出的 `platform-modal-shell`，而这条规则原先只写在网页端
 * 整站样式表 `src/index.css` 里；AGC 是独立宿主，只引入 `@genarrative/shared/styles.css`
 * 与 `theme.css`，于是这个类一条声明都命中不到——没有底色、没有边框、没有阴影。
 *
 * jsdom 不计算外部 CSS，所以这里不做"渲染出来看颜色"，而是把两半分别钉死：
 *   1) DOM 契约：组件真的把 `platform-modal-shell` / `platform-overlay` 挂上去了，且遮罩
 *      自带 `platform-theme--light`（否则 `var(--platform-modal-fill)` 解析为空，同样透明）；
 *   2) 样式表契约：从 AGC 入口文件按真实 import 关系解析出"AGC 到底加载了哪些样式表"，
 *      断言这批表里有该类规则、声明引用主题 token，且 token 在 light 块里是接近不透明的暖白。
 *
 * 这是**弱验证**（声明级，不是真机观感）。真机判据见文件末尾注释。
 */

const REPO_ROOT = process.cwd();
const AGC_ROOT = resolve(REPO_ROOT, 'apps/ai-game-creator-shell');

const PLATFORM_MODAL_SHELL = '.platform-modal-shell';
const PLATFORM_MODAL_BACKDROP = '.platform-modal-backdrop';
const PLATFORM_OVERLAY = '.platform-overlay';

/**
 * 宿主的样式表清单：webkit 端整站表、AGC 自己的业务表与宿主 chrome 表、以及共享表。
 * 「同一个类只准在一处定义」这条契约要跨这几张表比。
 */
const HOST_STYLE_SHEETS = [
  'src/index.css',
  'apps/ai-game-creator-shell/src/styles.css',
  'apps/ai-game-creator-shell/src/features/resource-canvas/resourceCanvasChrome.css',
  'packages/shared/src/components/styles.css',
];
const SHARED_STYLE_SHEET = 'packages/shared/src/components/styles.css';

/** 由 Vite/Tailwind 插件接管的样式入口，没有对应文件。 */
const PLUGIN_STYLE_ENTRIES = new Set(['tailwindcss']);

type CssRule = {
  file: string;
  selector: string;
  declarations: Map<string, string>;
};

function absoluteSheetPath(sheetPath: string) {
  return resolve(REPO_ROOT, sheetPath);
}

/** 清单与断言一律用仓库相对的正斜杠路径，免得 Windows 上比对不上。 */
function toRepoPath(absolutePath: string) {
  return relative(REPO_ROOT, absolutePath).replace(/\\/gu, '/');
}

/* ============================================================
   AGC 实际加载了哪些样式表：按入口文件的 import 关系解析，不手写清单。
   ============================================================ */

function resolveStyleSpecifier(specifier: string, fromFile: string): string {
  if (specifier.startsWith('.')) {
    return resolve(dirname(fromFile), specifier);
  }
  const match = /^(@[^/]+\/[^/]+|[^@/][^/]*)(\/.*)?$/u.exec(specifier);
  expect(match, `样式入口无法解析：${specifier}`).not.toBeNull();
  const packageName = match![1]!
    .replace(/^@genarrative\//u, '')
    .replace(/\//gu, '-');
  const packageDir = resolve(REPO_ROOT, 'packages', packageName);
  const manifestPath = resolve(packageDir, 'package.json');
  if (!existsSync(manifestPath)) {
    throw new Error(
      `AGC 新增了未知样式入口「${specifier}」：请把它的解析方式补进本用例的清单。`,
    );
  }
  const manifest = JSON.parse(readFileSync(manifestPath, 'utf8')) as {
    exports?: Record<string, string>;
  };
  // `@genarrative/shared/styles.css` → 包名 + exports 的键形态 `./styles.css`。
  const subpath = match![2] ? `.${match![2]}` : '.';
  const target = manifest.exports?.[subpath];
  if (!target) {
    throw new Error(
      `样式入口「${specifier}」在 packages/${packageName}/package.json 的 exports 里没有对应项。`,
    );
  }
  return resolve(packageDir, target);
}

/** 从 AGC 入口（`src/main.tsx`）出发，按 import / @import 关系收集它加载的样式表。 */
function collectAgcLoadedStyleSheets(): string[] {
  const entryFile = resolve(AGC_ROOT, 'src/main.tsx');
  const pending = [...readFileSync(entryFile, 'utf8').matchAll(
    /import\s+'(?<specifier>[^']+\.css)'/gu,
  )].map((match) =>
    resolveStyleSpecifier(match.groups!.specifier!, entryFile),
  );

  const loaded: string[] = [];
  while (pending.length > 0) {
    const sheet = pending.pop()!;
    if (loaded.includes(sheet)) {
      continue;
    }
    loaded.push(sheet);
    const source = readFileSync(sheet, 'utf8');
    for (const match of source.matchAll(/@import\s+'(?<specifier>[^']+)'/gu)) {
      const specifier = match.groups!.specifier!;
      if (PLUGIN_STYLE_ENTRIES.has(specifier)) {
        continue;
      }
      pending.push(resolveStyleSpecifier(specifier, sheet));
    }
  }

  return loaded.sort();
}

/* ============================================================
   声明级求值：够读本用例关心的类规则（顶层 + 一层媒体查询容器）。
   ============================================================ */

function splitSelectorList(selectorText: string): string[] {
  const selectors: string[] = [];
  let depth = 0;
  let current = '';
  for (const char of selectorText) {
    if (char === '(' || char === '[') {
      depth += 1;
    } else if (char === ')' || char === ']') {
      depth -= 1;
    }
    if (char === ',' && depth === 0) {
      selectors.push(current.trim().replace(/\s+/gu, ' '));
      current = '';
      continue;
    }
    current += char;
  }
  if (current.trim()) {
    selectors.push(current.trim().replace(/\s+/gu, ' '));
  }
  return selectors.filter(Boolean);
}

function parseDeclarations(body: string): Map<string, string> {
  const declarations = new Map<string, string>();
  for (const chunk of body.split(';')) {
    const separator = chunk.indexOf(':');
    if (separator < 0) {
      continue;
    }
    const property = chunk.slice(0, separator).trim();
    const value = chunk.slice(separator + 1).trim().replace(/\s+/gu, ' ');
    if (property) {
      declarations.set(property, value);
    }
  }
  return declarations;
}

function readRules(file: string): CssRule[] {
  const rules: CssRule[] = [];
  const source = readFileSync(file, 'utf8').replace(
    /\/\*[\s\S]*?\*\//gu,
    (comment) => comment.replace(/[^\n]/gu, ' '),
  );

  const readBlock = (text: string, start: number) => {
    let depth = 1;
    let index = start;
    while (index < text.length && depth > 0) {
      if (text[index] === '{') {
        depth += 1;
      } else if (text[index] === '}') {
        depth -= 1;
      }
      index += 1;
    }
    return { body: text.slice(start, index - 1), end: index };
  };

  const walk = (text: string) => {
    let cursor = 0;
    let buffer = '';
    while (cursor < text.length) {
      const char = text[cursor]!;
      if (char === '{') {
        const prelude = buffer.trim().replace(/\s+/gu, ' ');
        buffer = '';
        const { body, end } = readBlock(text, cursor + 1);
        cursor = end;
        if (prelude.startsWith('@')) {
          // 媒体查询/关键帧等容器：继续往里找声明块。
          walk(body);
          continue;
        }
        rules.push({
          file,
          selector: prelude,
          declarations: parseDeclarations(body),
        });
        continue;
      }
      if (char === ';' && !buffer.includes('{')) {
        // `@import …;` / `@source …;` / `@charset …;` 这类语句。
        buffer = '';
        cursor += 1;
        continue;
      }
      buffer += char;
      cursor += 1;
    }
  };

  walk(source);
  return rules;
}

/** 找"某个类自己就是一条独立选择器"的规则（不带后代/伪类限定）。 */
function findClassRule(rules: CssRule[], className: string): CssRule | null {
  return (
    rules.find((rule) => splitSelectorList(rule.selector).includes(className)) ??
    null
  );
}

/** 取颜色值里每个色停的 alpha；`rgb(...)` 视为 1。 */
function colorStopAlphas(value: string): number[] {
  return [...value.matchAll(/rgba?\((?<body>[^)]*)\)/gu)].map((match) => {
    const parts = match.groups!.body!.split(/[\s,/]+/u).filter(Boolean);
    return parts.length >= 4 ? Number(parts[3]) : 1;
  });
}

afterEach(() => {
  cleanup();
});

describe('「选择替换素材」弹窗在 AGC 的面板底色', () => {
  const loadedSheets = collectAgcLoadedStyleSheets();
  const loadedRules = loadedSheets.flatMap(readRules);
  const loadedLabels = loadedSheets.map((sheet) => toRepoPath(sheet));

  it('AGC 真的加载到了共享样式表与主题表（清单本身可信）', () => {
    expect(loadedLabels).toContain(SHARED_STYLE_SHEET);
    expect(loadedLabels).toContain('packages/shared/src/theme.css');
    expect(loadedLabels).toContain(
      'apps/ai-game-creator-shell/src/styles.css',
    );
    // 整站样式表不在 AGC 的加载清单里——这正是这个类原先"有类名没样式"的原因。
    expect(loadedLabels).not.toContain('src/index.css');
    // 反向对照：清单里确实有别的共享类规则，说明解析没有落空。
    expect(
      findClassRule(loadedRules, '.platform-button'),
      'AGC 加载的样式表解析结果缺少共享 .platform-button，说明清单解析不可信',
    ).not.toBeNull();
  });

  it('AGC 加载的样式表带 platform-modal-shell 的面板底色、边框与阴影', () => {
    const rule = findClassRule(loadedRules, PLATFORM_MODAL_SHELL);
    expect(
      rule,
      `${PLATFORM_MODAL_SHELL} 不在 AGC 加载的样式表里（${loadedLabels.join(', ')}）：面板会变透明`,
    ).not.toBeNull();

    expect(rule!.declarations.get('background')).toBe(
      'var(--platform-modal-fill)',
    );
    expect(rule!.declarations.get('border')).toBe(
      '1px solid var(--platform-modal-border)',
    );
    expect(rule!.declarations.get('box-shadow')).toBeTruthy();

    // 依赖的 token 必须由同一批样式表提供，否则 var() 解析为空、面板依旧透明。
    const lightTokens = findClassRule(loadedRules, '.platform-theme--light');
    expect(
      lightTokens?.declarations.get('--platform-modal-fill'),
      'AGC 加载的主题表里必须有 light 主题的 --platform-modal-fill',
    ).toBeTruthy();
    // 「不透明暖白底」是这次的验收判据：所有色停的 alpha 都要接近 1。
    const alphas = colorStopAlphas(
      lightTokens!.declarations.get('--platform-modal-fill')!,
    );
    expect(alphas.length).toBeGreaterThan(0);
    expect(Math.min(...alphas)).toBeGreaterThanOrEqual(0.9);
  });

  it('遮罩 platform-overlay 在 AGC 也有底色，不再只剩一层 blur', () => {
    const rule = findClassRule(loadedRules, PLATFORM_OVERLAY);
    expect(
      rule,
      `${PLATFORM_OVERLAY} 不在 AGC 加载的样式表里：遮罩没有底色`,
    ).not.toBeNull();
    expect(rule!.declarations.get('background')).toBe(
      'var(--platform-overlay-fill)',
    );
    const lightTokens = findClassRule(loadedRules, '.platform-theme--light');
    expect(
      lightTokens?.declarations.get('--platform-overlay-fill'),
    ).toBeTruthy();
  });

  it('组件挂上的宿主类与上面的样式表契约同源，且遮罩自带主题类', () => {
    render(
      <ImageCanvasProjectAssetPickerDialog
        open
        assets={[]}
        selectedAssetIds={[]}
        singleSelect
        selectionNoun="替换素材"
        onCancel={() => {}}
        onConfirm={() => {}}
      />,
    );

    const dialog = screen.getByRole('dialog', { name: '选择替换素材' });
    expect(dialog.className).toContain(PLATFORM_MODAL_SHELL.slice(1));

    // 弹窗 portal 到 body：主题类必须挂在遮罩上，面板才拿得到 --platform-modal-fill。
    const overlay = dialog.parentElement;
    expect(overlay, '弹窗面板应当挂在遮罩里').not.toBeNull();
    expect(overlay!.className).toContain(PLATFORM_OVERLAY.slice(1));
    expect(overlay!.className).toMatch(/platform-theme--(light|dark)/u);
  });

  it('没有平行拷贝：外壳三条规则只在共享表里定义一次', () => {
    const hostRules = HOST_STYLE_SHEETS.filter(existsSync).flatMap((sheet) =>
      readRules(absoluteSheetPath(sheet)),
    );
    for (const className of [
      PLATFORM_MODAL_SHELL,
      PLATFORM_MODAL_BACKDROP,
      PLATFORM_OVERLAY,
    ]) {
      const definingSheets = [
        ...new Set(
          hostRules
            .filter((rule) =>
              splitSelectorList(rule.selector).includes(className),
            )
            .map((rule) => toRepoPath(rule.file)),
        ),
      ];
      expect(
        definingSheets,
        `${className} 只应定义在共享样式表里，别在宿主业务样式里再抄一份`,
      ).toEqual([SHARED_STYLE_SHEET]);
    }
  });
});

/**
 * 真机判据（弱验证之外的确认方式）：
 * 打开 AGC 资源工作台 → 卡片工具条「替换素材」→「选择替换素材」弹窗：
 * 面板本体应当是不透明的暖白底（与「标签」「重命名」等平台弹窗一致），
 * 背后模糊的画布不应该透过卡片、搜索框、底部操作条；同时面板有 1px 边框与投影。
 */