class AccountBill {
  final int id;
  final int? memberId;
  final int? accountId;
  final double moneyBalance; // 当前余额
  final double beforeBalance; // 变动前余额
  final double afterBalance; // 变动后余额
  final double changeAmount; // 变动金额
  final int changeType; // 变动类型（1收入 2支出）
  final String changeDesc; // 变动描述
  final String source; // 变动来源
  final String createTime; // 创建时间
  final int createBy;
  final String updateTime;

  AccountBill({
    required this.id,
    this.memberId,
    this.accountId,
    this.moneyBalance = 0.0,
    this.beforeBalance = 0.0,
    this.afterBalance = 0.0,
    this.changeAmount = 0.0,
    this.changeType = 1,
    this.changeDesc = '',
    this.source = '未知来源',
    this.createTime = '',
    this.createBy = 0,
    this.updateTime = '',
  });

  factory AccountBill.fromJson(Map<String, dynamic> json) {
    return AccountBill(
      id: json['id'] ?? 0,
      memberId: json['member_id'],
      accountId: json['account_id'],
      moneyBalance: (json['money_balance'] as num?)?.toDouble() ?? 0.0,
      beforeBalance: (json['before_balance'] as num?)?.toDouble() ?? 0.0,
      afterBalance: (json['after_balance'] as num?)?.toDouble() ?? 0.0,
      changeAmount: (json['change_amount'] as num?)?.toDouble() ?? 0.0,
      changeType: json['change_type'] ?? 1,
      changeDesc: json['change_desc'] ?? '',
      source: json['source'] ?? '未知来源',
      createTime: json['create_time'] ?? '',
      createBy: json['create_by'] ?? 0,
      updateTime: json['update_time'] ?? '',
    );
  }
}