马良AI写作初始化仓库

AINoval/lib/models/user_credit.dart

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+import 'package:equatable/equatable.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'user_credit.g.dart';
+
+/// 用户积分模型
+@JsonSerializable()
+class UserCredit extends Equatable {
+  /// 用户ID
+  final String userId;
+  
+  /// 积分余额
+  final int credits;
+  
+  /// 积分与美元汇率（可选）
+  final double? creditToUsdRate;
+
+  const UserCredit({
+    required this.userId,
+    required this.credits,
+    this.creditToUsdRate,
+  });
+
+  factory UserCredit.fromJson(Map<String, dynamic> json) =>
+      _$UserCreditFromJson(json);
+
+  Map<String, dynamic> toJson() => _$UserCreditToJson(this);
+
+  @override
+  List<Object?> get props => [userId, credits, creditToUsdRate];
+
+  /// 获取格式化的积分显示文本
+  String get formattedCredits {
+    if (credits >= 1000000) {
+      return '${(credits / 1000000).toStringAsFixed(1)}M';
+    } else if (credits >= 1000) {
+      return '${(credits / 1000).toStringAsFixed(1)}K';
+    } else {
+      return credits.toString();
+    }
+  }
+
+  /// 获取等值美元显示（如果有汇率信息）
+  String get equivalentUsd {
+    if (creditToUsdRate != null && creditToUsdRate! > 0) {
+      final usd = credits / creditToUsdRate!;
+      return '\$${usd.toStringAsFixed(2)}';
+    }
+    return '';
+  }
+
+  /// 检查是否有足够积分
+  bool hasEnoughCredits(int required) {
+    return credits >= required;
+  }
+
+  /// 创建空积分对象
+  factory UserCredit.empty() {
+    return const UserCredit(
+      userId: '',
+      credits: 0,
+    );
+  }
+}