import { describe, it, expect } from 'vitest';
import { formatDuration, formatDurationCompact, formatRelativeTime } from './format';

describe('format', () => {
  describe('formatDuration', () => {
    it('formats zero', () => {
      expect(formatDuration(0)).toBe('00:00');
    });

    it('formats seconds only', () => {
      expect(formatDuration(30_000)).toBe('00:30');
    });

    it('formats minutes and seconds', () => {
      expect(formatDuration(5 * 60_000 + 30_000)).toBe('05:30');
    });

    it('formats hours', () => {
      expect(formatDuration(2 * 3600_000 + 15 * 60_000 + 45_000)).toBe('02:15:45');
    });

    it('handles negative values', () => {
      expect(formatDuration(-1000)).toBe('00:00');
    });
  });

  describe('formatDurationCompact', () => {
    it('formats seconds', () => {
      expect(formatDurationCompact(45_000)).toBe('45s');
    });

    it('formats minutes', () => {
      expect(formatDurationCompact(15 * 60_000)).toBe('15m');
    });

    it('formats hours and minutes', () => {
      expect(formatDurationCompact(2 * 3600_000 + 30 * 60_000)).toBe('2h 30m');
    });

    it('formats exact hours', () => {
      expect(formatDurationCompact(3 * 3600_000)).toBe('3h');
    });

    it('handles zero', () => {
      expect(formatDurationCompact(0)).toBe('0s');
    });
  });

  describe('formatRelativeTime', () => {
    it('returns "now" for small differences', () => {
      const now = Date.now();
      expect(formatRelativeTime(now + 5000, now)).toBe('now');
    });

    it('returns "in X" for future times', () => {
      const now = Date.now();
      const result = formatRelativeTime(now + 5 * 60_000, now);
      expect(result).toMatch(/^in /);
    });

    it('returns "X ago" for past times', () => {
      const now = Date.now();
      const result = formatRelativeTime(now - 5 * 60_000, now);
      expect(result).toMatch(/ ago$/);
    });
  });
});