import { describe, it, expect } from 'vitest';
import { signRequest, generateNonce, hmacSha256Sync } from '@/utils/request-signer';

describe('generateNonce', () => {
  it('生成 16 字符十六进制字符串', () => {
    const nonce = generateNonce();
    expect(nonce).toHaveLength(16);
    expect(nonce).toMatch(/^[0-9a-f]{16}$/);
  });

  it('连续调用生成不同值', () => {
    const n1 = generateNonce();
    const n2 = generateNonce();
    expect(n1).not.toBe(n2);
  });
});

describe('hmacSha256Sync', () => {
  it('相同输入产生相同输出', () => {
    const key = 'test-key';
    const msg = 'hello world';
    const r1 = hmacSha256Sync(key, msg);
    const r2 = hmacSha256Sync(key, msg);
    expect(r1).toBe(r2);
    expect(r1).toHaveLength(64); // SHA-256 = 32 bytes = 64 hex chars
  });

  it('不同输入产生不同输出', () => {
    const r1 = hmacSha256Sync('key', 'msg1');
    const r2 = hmacSha256Sync('key', 'msg2');
    expect(r1).not.toBe(r2);
  });
});

describe('signRequest', () => {
  const signingKey = 'test-signing-key-256-bit!!!!!!!!!!!';

  it('GET 请求生成正确的签名头', () => {
    const headers = signRequest('GET', '/health/patients', undefined, signingKey);

    expect(headers).toHaveProperty('X-Signature');
    expect(headers).toHaveProperty('X-Timestamp');
    expect(headers).toHaveProperty('X-Nonce');
    expect(headers['X-Nonce']).toHaveLength(16);
    expect(headers['X-Signature']).toHaveLength(64);
  });

  it('POST 请求包含 body hash', () => {
    const headers = signRequest('POST', '/health/vital-signs', { value: 120 }, signingKey);

    expect(headers).toHaveProperty('X-Signature');
    expect(headers['X-Signature']).toHaveLength(64);
  });

  it('无 body 时也能正常签名', () => {
    const headers = signRequest('GET', '/test', undefined, signingKey);
    expect(headers['X-Signature']).toBeTruthy();
  });

  it('相同参数不同 nonce 产生不同签名', () => {
    const h1 = signRequest('GET', '/test', undefined, signingKey);
    // 由于 nonce 不同，签名也不同
    const h2 = signRequest('GET', '/test', undefined, signingKey);
    expect(h1['X-Signature']).not.toBe(h2['X-Signature']);
  });
});