import { describe, expect, it } from 'vitest';
import { formatDateValue, parseDateValue } from './date-value';

describe('parseDateValue', () => {
  it('returns null for empty values', () => {
    expect(parseDateValue(null)).toBeNull();
    expect(parseDateValue(undefined)).toBeNull();
    expect(parseDateValue('')).toBeNull();
  });

  it('parses YYYY-MM-DD strings', () => {
    const date = parseDateValue('2026-01-12');
    expect(date).toBeInstanceOf(Date);
    expect(formatDateValue(date)).toBe('2026-01-12');
  });

  it('parses unix milliseconds', () => {
    const date = parseDateValue(new Date(2026, 0, 12).getTime());
    expect(formatDateValue(date)).toBe('2026-01-12');
  });
});

describe('formatDateValue', () => {
  it('formats a Date as YYYY-MM-DD', () => {
    expect(formatDateValue(new Date(2026, 0, 12))).toBe('2026-01-12');
  });

  it('returns an empty string for empty values', () => {
    expect(formatDateValue(null)).toBe('');
    expect(formatDateValue(undefined)).toBe('');
  });
});