/// 会员套餐（《03-接口文档》7.1，价格来自服务端配置）
class MembershipPlan {
  const MembershipPlan({
    required this.planCode,
    required this.name,
    required this.days,
    required this.points,
    this.enabled = true,
    this.desc = '',
  });

  final String planCode;
  final String name;

  /// 有效天数；0 = 终身
  final int days;
  final int points;
  final bool enabled;
  final String desc;

  factory MembershipPlan.fromJson(Map<String, dynamic> json) =>
      MembershipPlan(
        planCode: json['plan_code'] as String,
        name: json['name'] as String,
        days: (json['days'] as num).toInt(),
        points: (json['points'] as num).toInt(),
        enabled: json['enabled'] as bool? ?? true,
        desc: (json['desc'] as String?) ?? '',
      );
}

/// 套餐列表响应
class PlansResult {
  const PlansResult({required this.plans, this.benefits = const []});

  final List<MembershipPlan> plans;
  final List<String> benefits;

  factory PlansResult.fromJson(Map<String, dynamic> json) => PlansResult(
        plans: ((json['plans'] as List?) ?? const [])
            .whereType<Map<String, dynamic>>()
            .map(MembershipPlan.fromJson)
            .toList(),
        benefits:
            ((json['benefits'] as List?) ?? const []).cast<String>(),
      );
}

/// 我的会员状态（《03-接口文档》7.2）
class MyMemberState {
  const MyMemberState({
    this.isMember = false,
    this.isLifetime = false,
    this.currentPlan,
    this.planName,
    this.expireAt,
    this.remainingDays = 0,
    this.history = const [],
  });

  final bool isMember;
  final bool isLifetime;
  final String? currentPlan;
  final String? planName;
  final String? expireAt;
  final int remainingDays;
  final List<MemberHistoryItem> history;

  factory MyMemberState.fromJson(Map<String, dynamic> json) => MyMemberState(
        isMember: json['is_member'] as bool? ?? false,
        isLifetime: json['is_lifetime'] as bool? ?? false,
        currentPlan: json['current_plan'] as String?,
        planName: json['plan_name'] as String?,
        expireAt: json['expire_at'] as String?,
        remainingDays: (json['remaining_days'] as num?)?.toInt() ?? 0,
        history: ((json['history'] as List?) ?? const [])
            .whereType<Map<String, dynamic>>()
            .map(MemberHistoryItem.fromJson)
            .toList(),
      );
}

/// 会员开通历史
class MemberHistoryItem {
  const MemberHistoryItem({
    required this.orderNo,
    required this.planName,
    required this.pointsCost,
    this.startAt = '',
    this.endAt = '',
    this.source = 0,
  });

  final String orderNo;
  final String planName;
  final int pointsCost;
  final String startAt;
  final String endAt;
  final int source; // 1 积分开通 2 活动赠送

  String get sourceLabel => source == 2 ? '活动赠送' : '积分开通';

  factory MemberHistoryItem.fromJson(Map<String, dynamic> json) =>
      MemberHistoryItem(
        orderNo: json['order_no'] as String,
        planName: json['plan_name'] as String,
        pointsCost: (json['points_cost'] as num).toInt(),
        startAt: (json['start_at'] as String?) ?? '',
        endAt: (json['end_at'] as String?) ?? '',
        source: (json['source'] as num?)?.toInt() ?? 1,
      );
}