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

describe('WinRateFormatter', () => {
  describe('calculate', () => {
    it('should return "0.0" when no races completed', () => {
      expect(WinRateFormatter.calculate(0, 0)).toBe('0.0');
    });

    it('should calculate win rate correctly', () => {
      expect(WinRateFormatter.calculate(10, 5)).toBe('50.0');
      expect(WinRateFormatter.calculate(100, 25)).toBe('25.0');
      expect(WinRateFormatter.calculate(100, 75)).toBe('75.0');
    });

    it('should handle 100% win rate', () => {
      expect(WinRateFormatter.calculate(10, 10)).toBe('100.0');
    });

    it('should handle 0% win rate', () => {
      expect(WinRateFormatter.calculate(10, 0)).toBe('0.0');
    });

    it('should handle decimal win rates', () => {
      expect(WinRateFormatter.calculate(10, 3)).toBe('30.0');
      expect(WinRateFormatter.calculate(10, 7)).toBe('70.0');
    });
  });

  describe('format', () => {
    it('should format rate with 1 decimal place and % sign', () => {
      expect(WinRateFormatter.format(50.0)).toBe('50.0%');
      expect(WinRateFormatter.format(25.5)).toBe('25.5%');
      expect(WinRateFormatter.format(100.0)).toBe('100.0%');
    });

    it('should handle null rate', () => {
      expect(WinRateFormatter.format(null)).toBe('0.0%');
    });

    it('should handle undefined rate', () => {
      expect(WinRateFormatter.format(undefined)).toBe('0.0%');
    });

    it('should handle zero rate', () => {
      expect(WinRateFormatter.format(0)).toBe('0.0%');
    });

    it('should handle decimal rates', () => {
      expect(WinRateFormatter.format(12.34)).toBe('12.3%');
      expect(WinRateFormatter.format(99.99)).toBe('100.0%');
    });
  });
});