import { performRanking } from './ranker';

describe('performRanking', () => {
  it('should rank links based on similarity to search query', async () => {
    const linksWithContext = [
      'url: https://example.com/dogs, title: All about dogs, description: Learn about different dog breeds',
      'url: https://example.com/cats, title: Cat care guide, description: Everything about cats',
      'url: https://example.com/pets, title: General pet care, description: Care for all types of pets'
    ];

    const links = [
      'https://example.com/dogs',
      'https://example.com/cats', 
      'https://example.com/pets'
    ];

    const searchQuery = 'cats training';

    const result = await performRanking(linksWithContext, links, searchQuery);

    // Should return array of objects with link, linkWithContext, score, originalIndex
    expect(result).toBeInstanceOf(Array);
    expect(result.length).toBe(3);
    
    // First result should be the dogs page since query is about dogs
    expect(result[0].link).toBe('https://example.com/cats');
    
    // Each result should have required properties
    result.forEach(item => {
      expect(item).toHaveProperty('link');
      expect(item).toHaveProperty('linkWithContext');
      expect(item).toHaveProperty('score');
      expect(item).toHaveProperty('originalIndex');
      expect(typeof item.score).toBe('number');
      expect(item.score).toBeGreaterThanOrEqual(0);
      expect(item.score).toBeLessThanOrEqual(1);
    });

    // Scores should be in descending order
    for (let i = 1; i < result.length; i++) {
      expect(result[i].score).toBeLessThanOrEqual(result[i-1].score);
    }
  });

  it('should handle empty inputs', async () => {
    const result = await performRanking([], [], '');
    expect(result).toEqual([]);
  });

  it('should maintain original order for equal scores', async () => {
    const linksWithContext = [
      'url: https://example.com/1, title: Similar content A, description: test',
      'url: https://example.com/2, title: Similar content B, description: test'
    ];

    const links = [
      'https://example.com/1',
      'https://example.com/2'
    ];

    const searchQuery = 'test';

    const result = await performRanking(linksWithContext, links, searchQuery);

    // If scores are equal, original order should be maintained
    expect(result[0].originalIndex).toBeLessThan(result[1].originalIndex);
  });
});