import { parseRubMoney, rubMoney } from './rub-money';

describe('RUB money', () => {
  it.each([
    ['0', 0n],
    ['-100', -10000n],
    ['0.01', 1n],
    ['123.4', 12340n],
    ['90071992547409.93', 9007199254740993n],
    ['92233720368547758.07', 2n ** 63n - 1n],
    ['-92233720368547758.08', -(2n ** 63n)],
  ])('roundtrips %s exactly', (value, kopecks) => {
    expect(parseRubMoney({ currency: 'RUB', value })).toBe(kopecks);
    expect(rubMoney(kopecks)).toEqual({ currency: 'RUB', value });
  });

  it.each([
    '92233720368547758.08',
    '-92233720368547758.09',
    '1.001',
    '1.000',
    'NaN',
    'Infinity',
    '1e2',
    '1,23',
    '',
    ' 1',
    '1\n',
    '01',
  ])('rejects invalid input %s without rounding', (value) => {
    expect(() => parseRubMoney({ currency: 'RUB', value })).toThrow();
  });

  it('rejects other currencies and non-string values', () => {
    expect(() => parseRubMoney({ currency: 'USD', value: '1' })).toThrow();
    expect(() =>
      parseRubMoney({ currency: 'RUB', value: 1 as unknown as string }),
    ).toThrow();
  });

  it('requires positive operation amounts, including at the maximum', () => {
    for (const value of ['0', '-0.00', '-0.01']) {
      expect(() => parseRubMoney({ currency: 'RUB', value }, true)).toThrow();
    }
    expect(parseRubMoney({ currency: 'RUB', value: '0.01' }, true)).toBe(1n);
    expect(
      parseRubMoney({ currency: 'RUB', value: '92233720368547758.07' }, true),
    ).toBe(2n ** 63n - 1n);
  });

  it('formats computed sums beyond the storage range without losing precision', () => {
    expect(rubMoney(2n * (2n ** 63n - 1n))).toEqual({
      currency: 'RUB',
      value: '184467440737095516.14',
    });
    expect(rubMoney(-1n)).toEqual({ currency: 'RUB', value: '-0.01' });
  });
});