import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';

import 'package:qiangbao_accounting/utils/crypto.dart';
import 'package:qiangbao_accounting/utils/jwt_util.dart';

/// 构造一个只含 payload 的假 JWT（本地 exp 判断不校验签名）
String fakeJwt({DateTime? expiredAt, bool withExp = true}) {
  String seg(Map<String, dynamic> m) =>
      base64Url.encode(utf8.encode(jsonEncode(m))).replaceAll('=', '');
  final header = seg({'alg': 'HS512'});
  final payload = seg({
    'sub': 'tester',
    if (withExp)
      'exp': (expiredAt ?? DateTime.now().add(const Duration(hours: 1)))
              .millisecondsSinceEpoch ~/
          1000,
  });
  return '$header.$payload.signature';
}

void main() {
  test('crypto encrypt/decrypt roundtrip 与 uniApp 端算法一致', () {
    const password = 'abc12345';
    final encrypted = encryptPassword(password);
    expect(encrypted, isNotEmpty);
    expect(encrypted, isNot(password));
    expect(decryptPassword(encrypted), password);
  });

  group('JWT 过期判断', () {
    test('未来的 exp 视为未过期', () {
      expect(
        isJwtExpired(fakeJwt(expiredAt: DateTime.now().add(const Duration(hours: 1)))),
        isFalse,
      );
    });

    test('过去的 exp 视为已过期', () {
      expect(
        isJwtExpired(fakeJwt(expiredAt: DateTime.now().subtract(const Duration(hours: 1)))),
        isTrue,
      );
    });

    test('即将过期（落在 30 秒余量内）视为已过期', () {
      expect(
        isJwtExpired(fakeJwt(expiredAt: DateTime.now().add(const Duration(seconds: 5)))),
        isTrue,
      );
    });

    test('无 exp 字段不做本地判断，避免误判', () {
      expect(isJwtExpired(fakeJwt(withExp: false)), isFalse);
    });

    test('非 JWT 格式不做本地判断；空 token 视为无效', () {
      expect(isJwtExpired('not-a-jwt'), isFalse);
      expect(isJwtExpired(''), isTrue);
      expect(isJwtExpired(null), isTrue);
    });
  });
}