/// API响应模型基类
class BaseResponse<T> {
  final int code;
  final String message;
  final T? data;

  BaseResponse({
    required this.code,
    required this.message,
    this.data,
  });

  factory BaseResponse.fromJson(Map<String, dynamic> json, T Function(dynamic)? fromJsonT) {
    return BaseResponse(
      code: json['code'] ?? 0,
      message: json['message'] ?? '',
      data: fromJsonT != null && json.containsKey('data') && json['data'] != null
          ? fromJsonT(json['data'])
          : null,
    );
  }

  Map<String, dynamic> toJson(Object? Function(T?)? toJsonT) {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['code'] = code;
    data['message'] = message;
    if (this.data != null && toJsonT != null) {
      data['data'] = toJsonT(this.data);
    }
    return data;
  }

  /// 是否请求成功
  bool get isSuccess => code == 0;

  @override
  String toString() {
    return 'BaseResponse{code: $code, message: $message, data: $data}';
  }
}

/// 分页响应模型
class PaginatedResponse<T> {
  final List<T> records;  // 数据列表
  final int total;        // 总记录数
  final int size;         // 每页大小
  final int current;      // 当前页码
  final int pages;        // 总页数

  PaginatedResponse({
    required this.records,
    required this.total,
    required this.size,
    required this.current,
    required this.pages,
  });

  /// 是否还有更多数据
  bool get hasMore => current < pages;

  factory PaginatedResponse.fromJson(
    Map<String, dynamic> json,
    T Function(dynamic) fromJsonT,
  ) {
    final records = <T>[];
    // 支持 records 或 list 字段名
    final listData = json['records'] ?? json['list'];
    if (listData != null && listData is List) {
      for (final item in listData) {
        records.add(fromJsonT(item));
      }
    }

    return PaginatedResponse(
      records: records,
      total: json['total'] ?? 0,
      size: json['size'] ?? json['pageSize'] ?? 10,
      current: json['current'] ?? json['page'] ?? 1,
      pages: json['pages'] ?? 1,
    );
  }

  Map<String, dynamic> toJson(Object Function(T) toJsonT) {
    return {
      'records': records.map((e) => toJsonT(e)).toList(),
      'total': total,
      'size': size,
      'current': current,
      'pages': pages,
    };
  }

  @override
  String toString() {
    return 'PaginatedResponse{records: ${records.length} items, total: $total, current: $current, pages: $pages, size: $size}';
  }
}