class ApiResponse<T> {
  final String? description;
  final T? data;
  final String? errorMsg;
  final int? errorCode;

  const ApiResponse({
    this.description,
    this.data,
    this.errorMsg,
    this.errorCode,
  });

  // ✅ 新增：从 JSON 创建 ApiResponse
  factory ApiResponse.fromJson(
    Map<String, dynamic> json,
    T Function(dynamic)? dataFromJson, // 可为空，有些接口 data 是 null
  ) {
    final dataJson = json['data'];
    final T? parsedData = dataJson != null && dataFromJson != null ? dataFromJson(dataJson) : null;

    return ApiResponse<T>(
      errorCode: json['errorCode'] == null ? json['errcode'] : json['errorCode'],
      errorMsg: json['errorMsg'] == null ? json['errmsg'] : json['errorMsg'],
      description: json['description'],
      data: parsedData,
    );
  }

  // 成功工厂构造
  factory ApiResponse.success(
    T data, {
    String? errorMsg,
    int? errorCode,
    String? description,
  }) {
    return ApiResponse<T>(
      data: data,
      errorMsg: errorMsg ?? 'success',
      errorCode: errorCode,
      description: description ?? 'success',
    );
  }

  // 失败工厂构造
  factory ApiResponse.error(
    String errorMsg, {
    int? errorCode,
    T? data,
    String? description,
  }) {
    return ApiResponse<T>(
      description: description,
      errorMsg: errorMsg,
      errorCode: errorCode,
      data: data,
    );
  }

  bool get isSuccess {
    return errorCode == 0;
  }

  @override
  String toString() {
    return 'ApiResponse(description: $description, errorMsg: $errorMsg, data: $data, errorCode: $errorCode)';
  }

}