/**
 * highlight.ts 单元测试
 * 覆盖内置轻量语法高亮器的安全性与标记输出
 */

import { highlight, normalizeLanguage, registerLanguage, getSupportedLanguages } from '../src/highlight';

describe('highlight - 基础', () => {
  test('未知语言返回转义纯文本', () => {
    const out = highlight('const x = 1;', 'nonexistent');
    expect(out).toBe('const x = 1;');
  });

  test('支持的语言别名归一化', () => {
    expect(normalizeLanguage('js')).toBe('javascript');
    expect(normalizeLanguage('ts')).toBe('typescript');
    expect(normalizeLanguage('py')).toBe('python');
    expect(normalizeLanguage('sh')).toBe('bash');
    expect(normalizeLanguage('yml')).toBe('yaml');
    expect(normalizeLanguage('Java')).toBe('java');
    expect(normalizeLanguage('unknown')).toBe('');
    expect(normalizeLanguage('')).toBe('');
  });

  test('关键词被标记', () => {
    const out = highlight('const x = 1', 'js');
    expect(out).toContain('<span class="me-hl-keyword">const</span>');
  });

  test('字符串被标记', () => {
    const out = highlight('const s = "hello"', 'js');
    expect(out).toContain('<span class="me-hl-string">"hello"</span>');
  });

  test('注释被标记', () => {
    const out = highlight('// comment\nconst x = 1', 'js');
    expect(out).toContain('<span class="me-hl-comment">// comment</span>');
  });

  test('数字被标记', () => {
    const out = highlight('const n = 42', 'js');
    expect(out).toContain('<span class="me-hl-number">42</span>');
  });

  test('函数调用被标记', () => {
    const out = highlight('foo(bar)', 'js');
    expect(out).toContain('<span class="me-hl-function">foo</span>');
  });

  test('python 井号注释与 def 关键词', () => {
    const out = highlight('# note\ndef main():', 'python');
    expect(out).toContain('<span class="me-hl-comment"># note</span>');
    expect(out).toContain('<span class="me-hl-keyword">def</span>');
  });

  test('内置全局对象被标记', () => {
    const out = highlight('console.log("x")', 'js');
    expect(out).toContain('<span class="me-hl-builtin">console</span>');
  });
});

describe('highlight - 安全性', () => {
  test('HTML 特殊字符被转义，不产生裸标签', () => {
    const out = highlight('<script>alert(1)</script>', 'js');
    expect(out).not.toContain('<script>');
    expect(out).not.toContain('<script');
    expect(out).toContain('&lt;script&gt;');
  });

  test('字符串中的引号安全', () => {
    const out = highlight('const s = "a<b>&"', 'js');
    expect(out).not.toContain('a<b');
    expect(out).toContain('a&lt;b&gt;');
  });

  test('恶意输入不破坏 span 结构', () => {
    const out = highlight('"</span><script>x</script>"', 'js');
    // 所有 span 配对（每开一个 <span 就有一个 </span>）
    const opens = (out.match(/<span/g) || []).length;
    const closes = (out.match(/<\/span>/g) || []).length;
    expect(opens).toBe(closes);
    expect(out).not.toContain('<script');
  });
});

describe('highlight - 语言注册', () => {
  test('注册自定义语言', () => {
    registerLanguage('foo', { keywords: ['frobnicate'], builtins: [] });
    expect(normalizeLanguage('foo')).toBe('foo');
    const out = highlight('frobnicate the widget', 'foo');
    expect(out).toContain('<span class="me-hl-keyword">frobnicate</span>');
  });

  test('覆盖已有语言定义后规则缓存失效', () => {
    registerLanguage('langA', { keywords: ['one'], builtins: [] });
    expect(highlight('one', 'langA')).toContain('me-hl-keyword');
    registerLanguage('langA', { keywords: ['two'], builtins: [] });
    expect(highlight('two', 'langA')).toContain('me-hl-keyword');
    expect(highlight('one', 'langA')).not.toContain('me-hl-keyword');
  });

  test('getSupportedLanguages 返回语言列表', () => {
    const langs = getSupportedLanguages();
    expect(Array.isArray(langs)).toBe(true);
    expect(langs).toContain('javascript');
    expect(langs).toContain('typescript');
    expect(langs).toContain('python');
  });
});

describe('highlight - 环境一致性', () => {
  test('字符串高亮与引号转义环境无关（jsdom 断言）', () => {
    const out = highlight('const s = "hi"', 'js');
    expect(out).toContain('<span class="me-hl-string">"hi"</span>');
  });

  test('引号不被实体化，span 文本保持原样', () => {
    const out = highlight('"a" + \'b\'', 'js');
    expect(out).not.toContain('&quot;');
    // 双引号字符串应被完整标记
    expect(out).toContain('<span class="me-hl-string">"a"</span>');
    expect(out).toContain("<span class=\"me-hl-string\">'b'</span>");
  });
});