import { leadKeyword, parseKeywords, promoteKeyword } from '../keywords';

describe('parseKeywords', () => {
  it('splits on commas and drops the blanks', () => {
    expect(parseKeywords(' cast iron kettle, teapot ,, ')).toEqual([
      'cast iron kettle',
      'teapot',
    ]);
    expect(parseKeywords('')).toEqual([]);
  });
});

describe('leadKeyword', () => {
  it('puts the new keyword first and drops the old first one', () => {
    expect(leadKeyword('kettle, teapot, cups', 'cast iron kettle')).toBe(
      'cast iron kettle, teapot, cups'
    );
  });

  it('keeps a secondary keyword from appearing twice', () => {
    expect(leadKeyword('kettle, Teapot, cups', 'teapot')).toBe('teapot, cups');
  });

  it('starts the list when there was none', () => {
    expect(leadKeyword('', 'cast iron kettle')).toBe('cast iron kettle');
  });

  it('keeps to five keywords', () => {
    expect(leadKeyword('a, b, c, d, e', 'f')).toBe('f, b, c, d, e');
  });

  it('leaves the list alone without a keyword', () => {
    expect(leadKeyword('a, b', '  ')).toBe('a, b');
  });

  it('moves a secondary keyword to the front and keeps the rest in order', () => {
    expect(promoteKeyword('cast iron, seasoning, oil', 2)).toBe(
      'oil, cast iron, seasoning'
    );
    expect(promoteKeyword('cast iron, seasoning', 0)).toBe(
      'cast iron, seasoning'
    );
    expect(promoteKeyword('cast iron', 3)).toBe('cast iron');
  });
});