54 lines
1.8 KiB
Dart
54 lines
1.8 KiB
Dart
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// 功能描述：购物车条目、并发版本和结算快照；版本：1.0.0。
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import 'primary_models.dart';
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/// 服务端购物车快照；revision 用于阻止过期操作覆盖其他设备的修改。
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class CartItem {
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const CartItem({
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required this.product,
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required this.quantity,
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required this.selected,
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required this.available,
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required this.revision,
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this.specification = '',
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});
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final ProductSummary product;
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final int quantity;
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final bool selected, available;
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final String revision;
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final String specification;
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bool get purchasable => available && quantity > 0 && quantity <= product.stock;
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int get amount => product.price * quantity;
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factory CartItem.fromJson(Map<String, Object?> json, String Function(String) resolve) {
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final price = json['price_amount'], stock = json['stock_quantity'], quantity = json['quantity'];
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if (price is! int ||
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price < 0 ||
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stock is! int ||
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quantity is! int ||
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quantity < 0 ||
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quantity > 999 ||
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json['product_identity'] is! String ||
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(json['product_identity'] as String).isEmpty ||
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json['revision'] is! String ||
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json['selected'] is! bool ||
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json['available'] is! bool) {
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throw const FormatException('购物车数据异常');
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}
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return CartItem(
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product: ProductSummary(
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identity: json['product_identity'] as String,
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name: json['name'] as String? ?? '',
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price: price,
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stock: stock,
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imageUrl: resolve(json['image_url'] as String? ?? ''),
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category: json['category_name'] as String? ?? '',
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),
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quantity: quantity,
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selected: json['selected'] as bool,
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available: json['available'] as bool,
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revision: json['revision'] as String,
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specification: json['specification'] as String? ?? '',
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);
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}
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}
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