90 lines
2.7 KiB
Dart
90 lines
2.7 KiB
Dart
/// 券数据模型 — 对应后端 GET /api/v1/coupons 返回结构
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class CouponModel {
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final String id;
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final String issuerId;
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final String name;
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final String? description;
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final String? imageUrl;
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final double faceValue;
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final double currentPrice;
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final double? issuePrice;
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final int totalSupply;
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final int remainingSupply;
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final String category;
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final String status;
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final String couponType;
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final DateTime expiryDate;
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final bool isTransferable;
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final int resaleCount;
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final int maxResaleCount;
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// Joined issuer fields
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final String? brandName;
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final String? brandLogoUrl;
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final String? creditRating;
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const CouponModel({
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required this.id,
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required this.issuerId,
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required this.name,
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this.description,
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this.imageUrl,
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required this.faceValue,
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required this.currentPrice,
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this.issuePrice,
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required this.totalSupply,
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required this.remainingSupply,
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required this.category,
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required this.status,
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required this.couponType,
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required this.expiryDate,
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required this.isTransferable,
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this.resaleCount = 0,
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this.maxResaleCount = 3,
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this.brandName,
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this.brandLogoUrl,
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this.creditRating,
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});
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factory CouponModel.fromJson(Map<String, dynamic> json) {
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final issuer = json['issuer'] as Map<String, dynamic>?;
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return CouponModel(
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id: json['id'] ?? '',
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issuerId: json['issuerId'] ?? '',
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name: json['name'] ?? '',
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description: json['description'],
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imageUrl: json['imageUrl'],
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faceValue: _toDouble(json['faceValue']),
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currentPrice: _toDouble(json['currentPrice']),
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issuePrice: json['issuePrice'] != null ? _toDouble(json['issuePrice']) : null,
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totalSupply: json['totalSupply'] ?? 0,
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remainingSupply: json['remainingSupply'] ?? 0,
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category: json['category'] ?? '',
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status: json['status'] ?? '',
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couponType: json['couponType'] ?? 'utility',
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expiryDate: DateTime.tryParse(json['expiryDate']?.toString() ?? '') ?? DateTime.now(),
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isTransferable: json['isTransferable'] ?? true,
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resaleCount: json['resaleCount'] ?? 0,
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maxResaleCount: json['maxResaleCount'] ?? 3,
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brandName: issuer?['companyName'],
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brandLogoUrl: issuer?['logoUrl'],
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creditRating: issuer?['creditRating'],
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);
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}
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/// 折扣率 (0~1)
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double get discount => faceValue > 0 ? 1 - currentPrice / faceValue : 0;
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/// 是否即将过期（7天内）
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bool get isExpiringSoon => expiryDate.difference(DateTime.now()).inDays <= 7;
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/// 是否已过期
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bool get isExpired => expiryDate.isBefore(DateTime.now());
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static double _toDouble(dynamic value) {
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if (value == null) return 0;
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if (value is num) return value.toDouble();
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return double.tryParse(value.toString()) ?? 0;
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}
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}
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