const { pickOffers } = require('../src/utils/waitlist');

const q = (...qs) => qs.map((quantity, i) => ({ id: `e${i + 1}`, quantity }));

describe('pickOffers', () => {
  test('offers people in order while places last', () => {
    expect(pickOffers(q(1, 2, 1), 3, true)).toEqual([
      { entryId: 'e1', quantity: 1 },
      { entryId: 'e2', quantity: 2 },
    ]);
  });

  test('nothing free, no offers', () => {
    expect(pickOffers(q(1), 0, true)).toEqual([]);
  });

  test('partial offers: the first in line gets what is free, nobody jumps ahead', () => {
    expect(pickOffers(q(3, 1), 2, true)).toEqual([{ entryId: 'e1', quantity: 2 }]);
  });

  test('without partial offers, skips to the next person who fits', () => {
    expect(pickOffers(q(3, 1, 1), 2, false)).toEqual([
      { entryId: 'e2', quantity: 1 },
      { entryId: 'e3', quantity: 1 },
    ]);
  });

  test('without partial offers, nobody fits', () => {
    expect(pickOffers(q(3, 4), 2, false)).toEqual([]);
  });
});