/**
 * utils.ts 工具函数单元测试
 */
import { describe, it, expect, vi } from 'vitest';
import { escapeHtml, debounce, formatTime, uuid, shortUuid } from '../src/utils';

describe('escapeHtml', () => {
  it('转义 HTML 特殊字符', () => {
    expect(escapeHtml('<script>alert("xss")</script>')).toBe(
      '&lt;script&gt;alert(&quot;xss&quot;)&lt;/script&gt;'
    );
  });

  it('转义所有五种危险字符', () => {
    expect(escapeHtml('&<>"\'')).toBe('&amp;&lt;&gt;&quot;&#x27;');
  });

  it('不修改安全文本', () => {
    expect(escapeHtml('Hello World 你好世界')).toBe('Hello World 你好世界');
  });

  it('空字符串返回空字符串', () => {
    expect(escapeHtml('')).toBe('');
  });
});

describe('uuid', () => {
  it('生成符合 UUID v4 格式的字符串', () => {
    const id = uuid();
    expect(id).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/);
  });

  it('两次生成不同的值', () => {
    expect(uuid()).not.toBe(uuid());
  });
});

describe('shortUuid', () => {
  it('生成长度为 8 的字符串', () => {
    expect(shortUuid()).toHaveLength(8);
  });
});

describe('formatTime', () => {
  it('格式化为 HH:mm', () => {
    // 2026-01-15 14:30:00 UTC
    const ts = new Date(2026, 0, 15, 14, 30, 0).getTime();
    expect(formatTime(ts)).toBe('14:30');
  });

  it('补零处理', () => {
    const ts = new Date(2026, 0, 1, 9, 5, 0).getTime();
    expect(formatTime(ts)).toBe('09:05');
  });
});

describe('debounce', () => {
  it('延迟执行函数', async () => {
    vi.useFakeTimers();
    const fn = vi.fn();
    const debounced = debounce(fn, 100);

    debounced();
    expect(fn).not.toHaveBeenCalled();

    vi.advanceTimersByTime(100);
    expect(fn).toHaveBeenCalledTimes(1);

    vi.useRealTimers();
  });

  it('连续调用只执行最后一次', async () => {
    vi.useFakeTimers();
    const fn = vi.fn();
    const debounced = debounce(fn, 100);

    debounced();
    debounced();
    debounced();

    vi.advanceTimersByTime(100);
    expect(fn).toHaveBeenCalledTimes(1);

    vi.useRealTimers();
  });
});