68 lines
2.3 KiB
Dart
68 lines
2.3 KiB
Dart
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// 功能描述：钱包账单的严格金额与收支语义模型；版本：1.0.0。
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import 'client_models.dart';
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/// 账单是已记账事实，不把未完成订单或提现申请伪装成成功流水。
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class WalletBill {
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const WalletBill({
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required this.identity,
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required this.number,
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required this.direction,
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required this.tradeType,
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required this.amount,
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required this.fee,
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required this.balanceAfter,
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required this.createdAt,
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required this.channel,
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});
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final String identity, number, direction, tradeType, channel;
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final int amount, fee, balanceAfter;
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final DateTime createdAt;
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bool get income => direction == 'income';
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String get signedAmount => '${income ? '+' : '-'}${moneyText(amount)}';
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String get title => switch (tradeType) {
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'recharge' => '余额充值',
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'refund' => '退款入账',
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'ec_order' => '商城订单',
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'gas_order' => '气瓶订单',
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'withdrawal_reserve' => '提现资金冻结',
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'withdrawal_release' => '提现资金退回',
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'withdrawal_complete' => '提现完成',
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_ => '其他账单',
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};
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factory WalletBill.fromJson(Map<String, Object?> json) {
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int amount(String key, {bool positive = false}) {
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final value = json[key];
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if (value is! int || value < (positive ? 1 : 0)) {
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throw const FormatException('账单金额格式异常');
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}
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return value;
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}
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final direction = json['direction'];
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final date = DateTime.tryParse(json['created_at'] as String? ?? '');
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if (!['income', 'expense'].contains(direction) ||
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date == null ||
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(json['identity'] as String? ?? '').isEmpty) {
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throw const FormatException('账单信息不完整');
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}
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return WalletBill(
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identity: json['identity'] as String,
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number: json['record_no'] as String? ?? '',
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direction: direction as String,
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tradeType: json['trade_type'] as String? ?? '',
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amount: amount('amount', positive: true),
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fee: amount('fee'),
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balanceAfter: amount('balance_after'),
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createdAt: date.toLocal(),
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channel: json['pay_channel'] as String? ?? '',
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);
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}
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}
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/// 分页游标由服务端提供，不依据客户端条数猜测是否还有数据。
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class WalletBillPage {
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const WalletBillPage(this.items, this.nextCursor);
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final List<WalletBill> items;
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final String nextCursor;
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}
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