import { describe, it, expect } from 'vitest';
import { generateRechargeCode } from '@/lib/order/code-gen';

describe('generateRechargeCode', () => {
  it('should generate code with s2p_ prefix and random suffix', () => {
    const code = generateRechargeCode('cm1234567890');
    expect(code.startsWith('s2p_')).toBe(true);
    expect(code.length).toBeLessThanOrEqual(32);
    // 包含 orderId 部分和 8 字符随机后缀
    expect(code.length).toBeGreaterThan(12);
  });

  it('should truncate long order IDs to fit 32 chars', () => {
    const longId = 'a'.repeat(50);
    const code = generateRechargeCode(longId);
    expect(code.length).toBeLessThanOrEqual(32);
    expect(code.startsWith('s2p_')).toBe(true);
  });

  it('should generate different codes for same orderId (randomness)', () => {
    const code1 = generateRechargeCode('order-001');
    const code2 = generateRechargeCode('order-001');
    expect(code1).not.toBe(code2);
  });

  it('should handle empty string', () => {
    const code = generateRechargeCode('');
    expect(code.startsWith('s2p_')).toBe(true);
    expect(code.length).toBeLessThanOrEqual(32);
  });
});