/**
 * AriaEngine CryptoManager 加解密测试
 * @module tests/engine/aria-crypto
 *
 * v0.2.6 补强：此前仅验证实例化，现在验证真实的加解密往返一致性。
 */
import {
  CryptoManager,
  initCrypto,
  encryptPage,
  decryptPage,
  closeCrypto,
} from '../../src/engine/aria/crypto';

function toBytes(data: ArrayBuffer): number[] {
  return Array.from(new Uint8Array(data));
}

describe('AriaEngine — CryptoManager', () => {
  test('加解密往返一致', async () => {
    const cm = new CryptoManager();
    await cm.init('test-password');
    expect(cm.enabled).toBe(true);

    const original = new TextEncoder().encode('sensitive row data').buffer;
    const { iv, data } = await cm.encryptPage(original);
    // 密文应为乱码（与原文不同）
    expect(toBytes(data)).not.toEqual(toBytes(original));

    const decrypted = await cm.decryptPage(iv, data);
    expect(toBytes(decrypted)).toEqual(toBytes(original));
    cm.close();
    expect(cm.enabled).toBe(false);
  });

  test('错误密码解密失败（密钥不同）', async () => {
    const cm1 = new CryptoManager();
    await cm1.init('correct-password');
    const original = new TextEncoder().encode('top secret').buffer;
    const { iv, data } = await cm1.encryptPage(original);

    const cm2 = new CryptoManager();
    await cm2.init('wrong-password');
    await expect(cm2.decryptPage(iv, data)).rejects.toThrow();

    cm1.close();
    cm2.close();
  });

  test('不同 salt 派生不同密钥，解密互相失败', async () => {
    const cm1 = new CryptoManager();
    await cm1.init('pwd', new Uint8Array(16).fill(1));
    const cm2 = new CryptoManager();
    await cm2.init('pwd', new Uint8Array(16).fill(2));

    const original = new TextEncoder().encode('salt matters').buffer;
    const { iv, data } = await cm1.encryptPage(original);
    await expect(cm2.decryptPage(iv, data)).rejects.toThrow();

    cm1.close();
    cm2.close();
  });

  test('未初始化时加密抛错', async () => {
    const cm = new CryptoManager();
    expect(cm.enabled).toBe(false);
    const data = new TextEncoder().encode('x').buffer;
    await expect(cm.encryptPage(data)).rejects.toThrow(/not initialized/);
  });

  test('不同实例互不影响（独立密钥状态）', async () => {
    const cm1 = new CryptoManager();
    await cm1.init('pwd-a');
    const cm2 = new CryptoManager();
    await cm2.init('pwd-b');

    const original = new TextEncoder().encode('instance isolation').buffer;
    const { iv, data } = await cm1.encryptPage(original);
    await expect(cm2.decryptPage(iv, data)).rejects.toThrow();

    // 各自解密自己的数据
    const dec2orig = new TextEncoder().encode('two').buffer;
    const enc2 = await cm2.encryptPage(dec2orig);
    const dec2 = await cm2.decryptPage(enc2.iv, enc2.data);
    expect(toBytes(dec2)).toEqual(toBytes(dec2orig));

    cm1.close();
    cm2.close();
  });

  test('全局兼容层往返一致', async () => {
    await initCrypto('global-password');
    const original = new TextEncoder().encode('global compat layer').buffer;
    const { iv, data } = await encryptPage(original);
    const decrypted = await decryptPage(iv, data);
    expect(toBytes(decrypted)).toEqual(toBytes(original));
    closeCrypto();
  });

  test('大块数据（接近页面大小）往返一致', async () => {
    const cm = new CryptoManager();
    await cm.init('page-size-test');
    // 4KB 页面数据
    const original = new Uint8Array(4096);
    for (let i = 0; i < 4096; i++) original[i] = i % 251;
    const { iv, data } = await cm.encryptPage(original.buffer);
    const decrypted = await cm.decryptPage(iv, data);
    expect(toBytes(decrypted)).toEqual(toBytes(original.buffer));
    cm.close();
  });
});