import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { pausedUntilLabel, timeAgo } from './time';

describe('timeAgo', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-10-03T12:00:00Z'));
  });
  afterEach(() => vi.useRealTimers());

  it.each([
    ['2026-10-03T11:59:30Z', 'just now'],
    ['2026-10-03T11:55:00Z', '5m ago'],
    ['2026-10-03T09:00:00Z', '3h ago'],
    ['2026-09-30T12:00:00Z', '3d ago'],
    ['2026-10-03T12:00:10Z', 'just now'], // slight clock skew into the future
  ])('%s → %s', (iso, expected) => {
    expect(timeAgo(iso)).toBe(expected);
  });
});

describe('pausedUntilLabel', () => {
  const now = new Date(2026, 9, 3, 14, 0);
  it('says "until you turn it back on" for indefinite pauses', () => {
    expect(pausedUntilLabel(new Date(2126, 0, 1).toISOString(), now)).toBe('until you turn it back on');
  });
  it('shows a time for today and "tomorrow" past midnight', () => {
    expect(pausedUntilLabel(new Date(2026, 9, 3, 15, 0).toISOString(), now)).toMatch(/^until \d/);
    expect(pausedUntilLabel(new Date(2026, 9, 4, 1, 0).toISOString(), now)).toMatch(/^until tomorrow /);
  });
});