import { describe, it, expect } from 'vitest';
import { stringUtils } from '@/utils/string';

describe('stringUtils', () => {
  describe('truncate', () => {
    it('应该截断长字符串并添加省略号', () => {
      const longString = 'This is a very long string that should be truncated';
      const result = stringUtils.truncate(longString, 20);
      expect(result).toBe('This is a very lo...');
    });

    it('应该使用自定义后缀', () => {
      const longString = 'This is a very long string that should be truncated';
      const result = stringUtils.truncate(longString, 21, ' [more]');
      expect(result).toBe('This is a very [more]');
    });

    it('不应该截断短字符串', () => {
      const shortString = 'Short string';
      const result = stringUtils.truncate(shortString, 20);
      expect(result).toBe(shortString);
    });

    it('应该处理长度等于最大长度的字符串', () => {
      const exactString = 'Exact length';
      const result = stringUtils.truncate(exactString, 12);
      expect(result).toBe(exactString);
    });
  });

  describe('capitalize', () => {
    it('应该将字符串首字母大写', () => {
      expect(stringUtils.capitalize('hello')).toBe('Hello');
      expect(stringUtils.capitalize('world')).toBe('World');
    });

    it('应该处理空字符串', () => {
      expect(stringUtils.capitalize('')).toBe('');
    });

    it('应该保持已大写的首字母', () => {
      expect(stringUtils.capitalize('Hello')).toBe('Hello');
    });

    it('应该只改变首字母，保持其余部分不变', () => {
      expect(stringUtils.capitalize('hELLO')).toBe('HELLO');
    });
  });

  describe('toCamelCase', () => {
    it('应该将短横线分隔的字符串转换为驼峰命名', () => {
      expect(stringUtils.toCamelCase('hello-world')).toBe('helloWorld');
      expect(stringUtils.toCamelCase('my-variable-name')).toBe('myVariableName');
    });

    it('应该将下划线分隔的字符串转换为驼峰命名', () => {
      expect(stringUtils.toCamelCase('hello_world')).toBe('helloWorld');
      expect(stringUtils.toCamelCase('my_variable_name')).toBe('myVariableName');
    });

    it('应该将空格分隔的字符串转换为驼峰命名', () => {
      expect(stringUtils.toCamelCase('hello world')).toBe('helloWorld');
      expect(stringUtils.toCamelCase('my variable name')).toBe('myVariableName');
    });

    it('应该处理混合分隔符', () => {
      expect(stringUtils.toCamelCase('hello-world_test variable')).toBe('helloWorldTestVariable');
    });

    it('应该处理空字符串', () => {
      expect(stringUtils.toCamelCase('')).toBe('');
    });

    it('应该处理已经驼峰命名的字符串', () => {
      expect(stringUtils.toCamelCase('helloWorld')).toBe('helloWorld');
    });

    it('应该将首字母小写', () => {
      expect(stringUtils.toCamelCase('Hello-World')).toBe('helloWorld');
      expect(stringUtils.toCamelCase('HELLO_WORLD')).toBe('helloWorld');
    });
  });

  describe('toKebabCase', () => {
    it('应该将驼峰命名转换为短横线分隔', () => {
      expect(stringUtils.toKebabCase('helloWorld')).toBe('hello-world');
      expect(stringUtils.toKebabCase('myVariableName')).toBe('my-variable-name');
    });

    it('应该处理已短横线分隔的字符串', () => {
      expect(stringUtils.toKebabCase('hello-world')).toBe('hello-world');
    });

    it('应该处理下划线分隔的字符串', () => {
      expect(stringUtils.toKebabCase('hello_world')).toBe('hello-world');
    });

    it('应该处理空字符串', () => {
      expect(stringUtils.toKebabCase('')).toBe('');
    });
  });

  describe('toSnakeCase', () => {
    it('应该将驼峰命名转换为下划线分隔', () => {
      expect(stringUtils.toSnakeCase('helloWorld')).toBe('hello_world');
      expect(stringUtils.toSnakeCase('myVariableName')).toBe('my_variable_name');
    });

    it('应该处理已下划线分隔的字符串', () => {
      expect(stringUtils.toSnakeCase('hello_world')).toBe('hello_world');
    });

    it('应该处理短横线分隔的字符串', () => {
      expect(stringUtils.toSnakeCase('hello-world')).toBe('hello_world');
    });

    it('应该处理空字符串', () => {
      expect(stringUtils.toSnakeCase('')).toBe('');
    });
  });

  describe('escapeHtml', () => {
    it('应该转义HTML特殊字符', () => {
      expect(stringUtils.escapeHtml('<div>hello & world</div>')).toBe('&lt;div&gt;hello &amp; world&lt;/div&gt;');
      expect(stringUtils.escapeHtml('a "quote" and \'apostrophe\'')).toBe('a &quot;quote&quot; and &#039;apostrophe&#039;');
    });

    it('应该处理不包含特殊字符的字符串', () => {
      expect(stringUtils.escapeHtml('plain text')).toBe('plain text');
    });

    it('应该处理空字符串', () => {
      expect(stringUtils.escapeHtml('')).toBe('');
    });

    it('应该只转义已知的特殊字符', () => {
      expect(stringUtils.escapeHtml('hello @ world #test')).toBe('hello @ world #test');
    });
  });

  describe('randomString', () => {
    it('应该生成指定长度的随机字符串', () => {
      const length = 10;
      const result = stringUtils.randomString(length);
      expect(result).toHaveLength(length);
    });

    it('应该生成不同的随机字符串', () => {
      const result1 = stringUtils.randomString(10);
      const result2 = stringUtils.randomString(10);
      expect(result1).not.toBe(result2);
    });

    it('应该使用默认长度', () => {
      const result = stringUtils.randomString();
      expect(result).toHaveLength(10);
    });

    it('应该只包含字母和数字', () => {
      const result = stringUtils.randomString(100);
      const regex = /^[A-Za-z0-9]+$/;
      expect(regex.test(result)).toBe(true);
    });
  });

  describe('isEmpty', () => {
    it('应该识别空字符串', () => {
      expect(stringUtils.isEmpty('')).toBe(true);
      expect(stringUtils.isEmpty('   ')).toBe(true);
      expect(stringUtils.isEmpty('\t\n')).toBe(true);
    });

    it('应该识别非空字符串', () => {
      expect(stringUtils.isEmpty('hello')).toBe(false);
      expect(stringUtils.isEmpty(' hello ')).toBe(false);
    });

    it('应该处理null和undefined', () => {
      expect(stringUtils.isEmpty(null)).toBe(true);
      expect(stringUtils.isEmpty(undefined)).toBe(true);
    });
  });
});