import { keywordIdeas } from '../keyword-ideas';

describe('keyword ideas', () => {
  const page = {
    title: 'How to season a cast iron pan',
    html: `<p>Seasoning a cast iron pan takes an hour. A cast iron pan that is seasoned well lasts for generations.</p>
<h2>Which oil to use</h2><p>Flaxseed oil and vegetable oil both work. Vegetable oil is cheaper.</p>
<h2>Cast iron care</h2><p>Dry the cast iron pan after every wash.</p>`,
  };

  it('finds the phrases the title and the text share, strongest first', () => {
    const ideas = keywordIdeas(page);
    expect(ideas[0]).toBe('cast iron pan');
    expect(ideas).toContain('vegetable oil');
  });

  it('keeps one of overlapping phrases and leaves out what is set already', () => {
    const ideas = keywordIdeas(page, ['Vegetable oil']);
    expect(ideas).not.toContain('vegetable oil');
    expect(ideas.filter(idea => idea.includes('cast iron'))).toHaveLength(1);
  });

  it('never starts or ends on a word that means nothing', () => {
    keywordIdeas(page).forEach(idea => {
      expect(idea).not.toMatch(/^(a|the|to|of|and|how) | (a|the|to|of|and)$/);
    });
  });

  it('leaves out the runs that wait for their noun, in English and Romanian', () => {
    const english = keywordIdeas({
      title: 'How to Choose the Right Hoodie Size',
      html: '<p>To choose the right hoodie size, measure your chest. The right hoodie size fits over a shirt.</p>',
    });
    expect(english).toContain('hoodie size');
    expect(english).not.toContain('choose the right');
    const romanian = keywordIdeas({
      title: 'Cum alegi hanoracul potrivit',
      html: '<p>Dacă ești între două mărimi, alege hanoracul mai mare. Când te măsori, stai drept.</p><p>Te măsori cu un centimetru. Ești între două mărimi? Hanoracul potrivit stă bine.</p>',
    });
    expect(romanian).toContain('hanoracul potrivit');
    romanian.forEach(idea =>
      expect(idea).not.toMatch(
        /^(ești|te|între|două|îți) | (ești|te|între|două|îți)$/
      )
    );
  });

  it('reads Romanian', () => {
    const ideas = keywordIdeas({
      title: 'Cum alegi o tigaie din fontă',
      html: '<p>O tigaie din fontă ține o viață. Tigaie din fontă sau tigaie ceramică?</p><p>Tigaie ceramică se curăță ușor.</p>',
    });
    expect(ideas).toContain('tigaie din fontă');
    expect(ideas).toContain('tigaie ceramică');
  });
});