'use strict';

const { fmtDate, fmtDateTime, fmtTime } = require('../../utils/datetime.util');

const ISO = '2026-06-20T14:30:00.000Z'; // Saturday, June 20, 2026, 2:30 PM UTC

// ── fmtDate ───────────────────────────────────────────────────────────────────

describe('fmtDate()', () => {
  test('null → returns —', () => {
    expect(fmtDate(null)).toBe('—');
  });

  test('empty string → returns —', () => {
    expect(fmtDate('')).toBe('—');
  });

  test('formats year correctly', () => {
    expect(fmtDate(ISO)).toContain('2026');
  });

  test('formats month correctly (June)', () => {
    expect(fmtDate(ISO)).toContain('June');
  });

  test('formats day correctly (20)', () => {
    expect(fmtDate(ISO)).toContain('20');
  });

  test('accepts Date object as well as ISO string', () => {
    const d = new Date(ISO);
    expect(fmtDate(d)).toContain('2026');
  });
});

// ── fmtDateTime ───────────────────────────────────────────────────────────────

describe('fmtDateTime()', () => {
  test('null → returns —', () => {
    expect(fmtDateTime(null)).toBe('—');
  });

  test('contains date portion', () => {
    expect(fmtDateTime(ISO)).toContain('2026');
    expect(fmtDateTime(ISO)).toContain('June');
  });

  test('contains time portion (2:30 PM UTC)', () => {
    const out = fmtDateTime(ISO);
    expect(out).toMatch(/2:30/);
    expect(out).toContain('UTC');
  });
});

// ── fmtTime ───────────────────────────────────────────────────────────────────

describe('fmtTime()', () => {
  test('null → returns —', () => {
    expect(fmtTime(null)).toBe('—');
  });

  test('outputs time with AM/PM', () => {
    expect(fmtTime(ISO)).toMatch(/\d+:\d{2}\s*(AM|PM)/);
  });

  test('contains timezone label (UTC)', () => {
    expect(fmtTime(ISO)).toContain('UTC');
  });

  test('locale option changes output', () => {
    const en = fmtTime(ISO, { locale: 'en-US' });
    expect(en).toBeTruthy();
  });
});