import { formatVersion, formatFileSize, formatDateTime, getProjectDisplayName } from '../utils';

// Mock fs module
const fs = require('fs');
jest.mock('fs', () => ({
  ...jest.requireActual('fs'),
  readFileSync: jest.fn(),
}));

describe('formatVersion', () => {
  test('应该将下划线替换为点号', () => {
    expect(formatVersion('0_42')).toBe('0.42');
    expect(formatVersion('1_23_4')).toBe('1.23.4');
    expect(formatVersion('2_0')).toBe('2.0');
  });

  test('应该处理没有下划线的版本号', () => {
    expect(formatVersion('1.0')).toBe('1.0');
    expect(formatVersion('2.3.4')).toBe('2.3.4');
  });

  test('应该处理空字符串', () => {
    expect(formatVersion('')).toBe('');
  });
});

describe('formatFileSize', () => {
  test('应该格式化字节数', () => {
    expect(formatFileSize(0)).toBe('0 B');
    expect(formatFileSize(100)).toBe('100 B');
    expect(formatFileSize(1023)).toBe('1023 B');
  });

  test('应该格式化KB', () => {
    expect(formatFileSize(1024)).toBe('1.00 KB');
    expect(formatFileSize(2048)).toBe('2.00 KB');
    expect(formatFileSize(1536)).toBe('1.50 KB');
  });

  test('应该格式化MB', () => {
    expect(formatFileSize(1024 * 1024)).toBe('1.00 MB');
    expect(formatFileSize(2 * 1024 * 1024)).toBe('2.00 MB');
    expect(formatFileSize(1.5 * 1024 * 1024)).toBe('1.50 MB');
  });

  test('应该格式化GB', () => {
    expect(formatFileSize(1024 * 1024 * 1024)).toBe('1.00 GB');
    expect(formatFileSize(2 * 1024 * 1024 * 1024)).toBe('2.00 GB');
  });
});

describe('formatDateTime', () => {
  test('应该格式化日期时间为标准格式', () => {
    const date = new Date('2024-01-15T09:30:00');
    expect(formatDateTime(date)).toBe('2024-01-15 09:30');
  });

  test('应该正确处理午夜时间', () => {
    const date = new Date('2024-12-31T00:00:00');
    expect(formatDateTime(date)).toBe('2024-12-31 00:00');
  });

  test('应该正确处理月末日期', () => {
    const date = new Date('2024-12-31T23:59:00');
    expect(formatDateTime(date)).toBe('2024-12-31 23:59');
  });

  test('应该正确处理单数月份和日期', () => {
    const date = new Date('2024-01-05T09:05:00');
    expect(formatDateTime(date)).toBe('2024-01-05 09:05');
  });
});

describe('getProjectDisplayName', () => {
  const originalAliases = {
    'FT': '外放构建',
    'FT_DEV': '开发构建',
  };

  beforeEach(() => {
    // Mock the aliases file
    fs.readFileSync.mockReturnValue(JSON.stringify(originalAliases));
  });

  afterEach(() => {
    jest.clearAllMocks();
  });

  it('should return display name for aliased project', () => {
    expect(getProjectDisplayName('FT')).toBe('外放构建');
  });

  it('should return directory name when no alias exists', () => {
    expect(getProjectDisplayName('UNKNOWN')).toBe('UNKNOWN');
  });

  it('should return directory name when aliases file is empty', () => {
    fs.readFileSync.mockReturnValue('{}');
    expect(getProjectDisplayName('FT')).toBe('FT');
  });

  it('should return directory name when aliases file cannot be read', () => {
    fs.readFileSync.mockImplementation(() => {
      throw new Error('File not found');
    });
    expect(getProjectDisplayName('FT')).toBe('FT');
  });
});