// @vitest-environment jsdom

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

import {
  ChatMarkdownMessage,
  MarkdownErrorBoundary,
} from '../src/components/ChatMarkdownMessage';

function FailingChild({ shouldThrow }: { shouldThrow: boolean }) {
  if (shouldThrow) {
    throw new Error('transient render failure');
  }
  return <span>markdown recovered</span>;
}

describe('ChatMarkdownMessage', () => {
  it('代码块带语言标识及高亮节点，文件预览保留空行和 HTML 源码', () => {
    const source =
      'const value = "<script>alert(1)</script>";\n\n\n  return value;\n';
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        preserveBlankLines
        text={`\`\`\`\`typescript\n${source}\`\`\`\``}
      />,
    );
    expect(container.querySelector('pre code')?.textContent).toBe(source);
    expect(
      container.querySelector('code.language-typescript .hljs-keyword'),
    ).not.toBeNull();
    expect(container.querySelector('script')).toBeNull();
  });

  it('未知语言保留代码而不进入错误回退', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'```unknown-language\n原始内容\n```'}
      />,
    );
    expect(container.querySelector('pre code')?.textContent).toBe('原始内容\n');
  });

  it('大文件跳过高亮但保留完整代码', () => {
    const source = 'const value = 42;\n'.repeat(6000);
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        preserveBlankLines
        text={`\`\`\`js\n${source}\`\`\``}
      />,
    );
    expect(container.querySelector('pre code')?.textContent).toBe(source);
    expect(container.querySelector('.hljs-keyword')).toBeNull();
  });

  it('渲染 assistant 的 GFM 内容与代码块', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'## 标题\n\n- 一项\n- 二项\n\n```ts\nconst answer = 42;\n```'}
      />,
    );

    expect(container.querySelector('h2')?.textContent).toBe('标题');
    expect(container.querySelectorAll('li')).toHaveLength(2);
    expect(container.querySelector('pre code')?.textContent).toContain(
      'const answer = 42;',
    );
  });

  it('无序列表用真正的列表标记并逐层缩进，不再手写短横线', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={
          '- 无序号 A\n- 无序号 B\n  - 缩进一层的子项\n    - 缩进两层的子项\n  - 回到一层子项\n- 无序号 C'
        }
      />,
    );

    const lists = container.querySelectorAll('ul');
    expect(lists).toHaveLength(3);
    // 真正的列表标记：靠 `list-disc` 画项目符号、`pl-4` 让换行后的第二行保持悬挂缩进。
    for (const list of Array.from(lists)) {
      expect(list.className).toContain('list-disc');
      expect(list.className).toContain('pl-4');
      expect(list.className).not.toContain('list-none');
    }
    // 列表项文本里不能再出现手写的 `- ` 前缀（那会让换行行顶回最左边，也不符合列表语义）。
    for (const item of Array.from(container.querySelectorAll('ul > li'))) {
      expect(item.textContent ?? '').not.toMatch(/^\s*-\s/);
    }
    expect(container.querySelector('ul > li')?.textContent).toBe('无序号 A');
  });

  it('为四到六级标题提供递进的字号与字重', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'#### H4 四级标题\n\n##### H5 五级标题\n\n###### H6 六级标题'}
      />,
    );

    expect(container.querySelector('h4')?.className).toContain('font-semibold');
    expect(container.querySelector('h5')?.className).toContain('font-medium');
    expect(container.querySelector('h6')?.className).toContain('tracking-wide');
  });

  it('有序列表不添加无序列表短横线，列表项段落与文本同行', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'1. 第一件事\n\n2. 第二件事\n\n   1. 子步骤 2.1'}
      />,
    );

    const items = container.querySelectorAll('ol > li');
    expect(items[0]?.textContent?.trim()).toBe('第一件事');
    expect(items[1]?.textContent?.trim()).toContain('第二件事');
    expect(items[0]?.querySelector('p')?.className ?? '').toContain('inline');
    expect(items[0]?.className).toContain('whitespace-normal');
    expect(items[0]?.textContent).not.toContain('-');
  });

  it('保留 Markdown 有序列表的起始编号', () => {
    const { container } = render(
      <ChatMarkdownMessage role="assistant" text={'3. third\n4. fourth'} />,
    );

    expect(container.querySelector('ol')?.getAttribute('start')).toBe('3');
    expect(container.querySelectorAll('ol > li')).toHaveLength(2);
  });

  it('为列表项后续段落保留段落间距', () => {
    const { container } = render(
      <ChatMarkdownMessage role="assistant" text={'- first\n\n    second'} />,
    );

    const paragraphs = container.querySelectorAll('ul > li p');
    expect(paragraphs).toHaveLength(2);
    expect(paragraphs[0]?.className).toContain('inline');
    expect(paragraphs[1]?.className).toContain('mt-2');
    expect(paragraphs[1]?.className).not.toContain('inline');
  });

  it('不会把 react-markdown 的 node 元数据泄漏到代码节点', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'```ts\nconst answer = 42;\n```'}
      />,
    );

    expect(
      container.querySelector('pre code')?.getAttribute('node'),
    ).toBeNull();
  });

  it('无语言标记的多行围栏代码仍使用代码块样式', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'```\nconst answer = 42;\nreturn answer;\n```'}
      />,
    );

    const code = container.querySelector('pre code');
    expect(code?.className).toContain('whitespace-pre');
    expect(code?.className).not.toContain('rounded');
  });

  it('保留行内代码中的 HTML 字面量', () => {
    const { container } = render(
      <ChatMarkdownMessage role="assistant" text={'`<span>`'} />,
    );

    expect(container.querySelector('code')?.textContent).toBe('<span>');
  });

  it('保留围栏代码中的 HTML 字面量而不双重转义', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'```html\n<div class="card"></div>\n```'}
      />,
    );

    expect(container.querySelector('pre code')?.textContent).toContain(
      '<div class="card"></div>',
    );
    expect(container.querySelector('pre code')?.textContent).not.toContain(
      '&lt;div',
    );
  });

  it('累计文本变化后可从 Markdown 错误回退中恢复', () => {
    const consoleError = vi
      .spyOn(console, 'error')
      .mockImplementation(() => {});
    try {
      const { container, rerender } = render(
        <MarkdownErrorBoundary fallbackText="partial">
          <FailingChild shouldThrow />
        </MarkdownErrorBoundary>,
      );

      expect(container.textContent).toBe('partial');

      rerender(
        <MarkdownErrorBoundary fallbackText="complete">
          <FailingChild shouldThrow={false} />
        </MarkdownErrorBoundary>,
      );

      expect(container.textContent).toBe('markdown recovered');
    } finally {
      consoleError.mockRestore();
    }
  });

  it('保留流式 assistant 文本并标记 streaming 状态', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        streaming
        text={'正在生成 **结果'}
      />,
    );

    expect(container.textContent).toContain('正在生成');
    expect(container.textContent).toContain('结果');
  });

  it('用户消息保持纯文本，不解析 Markdown', () => {
    const { container } = render(
      <ChatMarkdownMessage role="user" text={'**不要解析**\n`/read game`'} />,
    );

    expect(container.querySelector('strong')).toBeNull();
    expect(container.querySelector('code')).toBeNull();
    expect(container.textContent).toContain('**不要解析**');
    expect(container.textContent).toContain('`/read game`');
  });

  it('不输出原始 HTML、可点击链接或图片节点', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={
          '<script>alert(1)</script>\n\n[外链](https://example.com) ![示意图](x.png)'
        }
      />,
    );

    expect(container.querySelector('script')).toBeNull();
    expect(container.querySelector('a')).toBeNull();
    expect(container.querySelector('img')).toBeNull();
    expect(container.textContent).toContain('外链');
    expect(container.textContent).toContain('图片：示意图');
  });

  it('支持表格并允许窄视口横向滚动', () => {
    const { container } = render(
      <ChatMarkdownMessage
        role="assistant"
        text={'| 名称 | 状态 |\n| --- | --- |\n| demo | ready |'}
      />,
    );

    expect(container.querySelectorAll('table th')).toHaveLength(2);
    expect(container.querySelector('div.overflow-x-auto')).toBeTruthy();
  });
});