import { bustImageCache } from '../imageUtils';

describe('bustImageCache', () => {
  it('should add cache-busting parameter to HTTP URLs', () => {
    const url = 'https://example.com/avatar.jpg';
    const result = bustImageCache(url, 1234567890);
    expect(result).toBe('https://example.com/avatar.jpg?t=1234567890');
  });

  it('should add cache-busting parameter to URLs with existing query params', () => {
    const url = 'https://example.com/avatar.jpg?size=large';
    const result = bustImageCache(url, 1234567890);
    expect(result).toBe('https://example.com/avatar.jpg?size=large&t=1234567890');
  });

  it('should not add cache-busting to file:// URIs', () => {
    const uri = 'file:///path/to/local/image.jpg';
    const result = bustImageCache(uri);
    expect(result).toBe(uri);
  });

  it('should not add cache-busting to data URIs', () => {
    const dataUri = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA';
    const result = bustImageCache(dataUri);
    expect(result).toBe(dataUri);
  });

  it('should not add cache-busting to placeholder images', () => {
    const placeholderUrl = 'https://example.com/placeholder.png';
    const result = bustImageCache(placeholderUrl);
    expect(result).toBe(placeholderUrl);
  });

  it('should return null for null input', () => {
    const result = bustImageCache(null);
    expect(result).toBeNull();
  });

  it('should return null for undefined input', () => {
    const result = bustImageCache(undefined);
    expect(result).toBeNull();
  });

  it('should return null for empty string', () => {
    const result = bustImageCache('');
    expect(result).toBeNull();
  });

  it('should use current timestamp when not provided', () => {
    const url = 'https://example.com/avatar.jpg';
    const beforeTimestamp = Date.now();
    const result = bustImageCache(url);
    const afterTimestamp = Date.now();

    // Extract timestamp from result
    const match = result?.match(/t=(\d+)/);
    expect(match).toBeTruthy();

    if (match) {
      const timestamp = parseInt(match[1], 10);
      expect(timestamp).toBeGreaterThanOrEqual(beforeTimestamp);
      expect(timestamp).toBeLessThanOrEqual(afterTimestamp);
    }
  });
});