import { describe, it, expect } from 'vitest';
import { DashboardDateDisplay } from './DashboardDateDisplay';

describe('DashboardDateDisplay', () => {
  describe('happy paths', () => {
    it('should format future date correctly', () => {
      const now = new Date();
      const futureDate = new Date(now.getTime() + 24 * 60 * 60 * 1000); // 24 hours from now

      const result = DashboardDateDisplay.format(futureDate);

      expect(result.date).toMatch(/^[A-Za-z]{3}, [A-Za-z]{3} \d{1,2}, \d{4}$/);
      expect(result.time).toMatch(/^\d{2}:\d{2}$/);
      expect(result.relative).toBe('1d');
    });

    it('should format date less than 24 hours correctly', () => {
      const now = new Date();
      const futureDate = new Date(now.getTime() + 6 * 60 * 60 * 1000); // 6 hours from now

      const result = DashboardDateDisplay.format(futureDate);

      expect(result.relative).toBe('6h');
    });

    it('should format date more than 24 hours correctly', () => {
      const now = new Date();
      const futureDate = new Date(now.getTime() + 48 * 60 * 60 * 1000); // 2 days from now

      const result = DashboardDateDisplay.format(futureDate);

      expect(result.relative).toBe('2d');
    });

    it('should format past date correctly', () => {
      const now = new Date();
      const pastDate = new Date(now.getTime() - 24 * 60 * 60 * 1000); // 24 hours ago

      const result = DashboardDateDisplay.format(pastDate);

      expect(result.relative).toBe('Past');
    });

    it('should format current date correctly', () => {
      const now = new Date();

      const result = DashboardDateDisplay.format(now);

      expect(result.relative).toBe('Now');
    });

    it('should format date with leading zeros in time', () => {
      const date = new Date('2024-01-15T05:03:00');

      const result = DashboardDateDisplay.format(date);

      expect(result.time).toBe('05:03');
    });
  });

  describe('edge cases', () => {
    it('should handle midnight correctly', () => {
      const date = new Date('2024-01-15T00:00:00');

      const result = DashboardDateDisplay.format(date);

      expect(result.time).toBe('00:00');
    });

    it('should handle end of day correctly', () => {
      const date = new Date('2024-01-15T23:59:59');

      const result = DashboardDateDisplay.format(date);

      expect(result.time).toBe('23:59');
    });

    it('should handle different days of week', () => {
      const date = new Date('2024-01-15'); // Monday

      const result = DashboardDateDisplay.format(date);

      expect(result.date).toContain('Mon');
    });

    it('should handle different months', () => {
      const date = new Date('2024-01-15');

      const result = DashboardDateDisplay.format(date);

      expect(result.date).toContain('Jan');
    });
  });
});