/// 管理页「单元集」列表项。
class DeckInfo {
  const DeckInfo({
    required this.id,
    required this.title,
    required this.algorithm,
    required this.totalItems,
    required this.activatedItems,
    required this.lastStudied,
    required this.description,
  });

  final String id;
  final String title;
  final String algorithm;
  final int totalItems;
  final int activatedItems;

  /// 最近一次学习的人话描述，如「3 天前」。
  final String lastStudied;
  final String description;

  double get progress => totalItems == 0 ? 0 : activatedItems / totalItems;

  String get progressPercent => '${(progress * 100).toStringAsFixed(1)}%';

  static const List<DeckInfo> samples = <DeckInfo>[
    DeckInfo(
      id: 'cngk-t',
      title: '高考必背古诗文',
      algorithm: 'NSP-0',
      totalItems: 950,
      activatedItems: 295,
      lastStudied: '3 天前',
      description: '高考古诗文 60 篇',
    ),
    DeckInfo(
      id: 'cet6-core',
      title: 'CET-6 核心词汇',
      algorithm: 'SM-2',
      totalItems: 6204,
      activatedItems: 2819,
      lastStudied: '昨天',
      description: '六级高频词，按词频排序',
    ),
    DeckInfo(
      id: 'linalg-formula',
      title: '线性代数公式',
      algorithm: 'FSRS',
      totalItems: 120,
      activatedItems: 0,
      lastStudied: '未开始',
      description: '期末复习用，含推导步骤',
    ),
  ];
}

/// 管理页「计划」列表项。
class PlanInfo {
  const PlanInfo({
    required this.title,
    required this.newPerDay,
    required this.reviewPerDay,
    required this.window,
    required this.enabled,
    required this.description,
  });

  final String title;
  final int newPerDay;
  final int reviewPerDay;

  /// 允许学习的时段，如「08:00–23:00」。
  final String window;
  final bool enabled;
  final String description;

  static const List<PlanInfo> samples = <PlanInfo>[
    PlanInfo(
      title: '每日计划',
      newPerDay: 35,
      reviewPerDay: 200,
      window: '08:00–23:00',
      enabled: true,
      description: '默认计划，每天引入 35 条新识记',
    ),
    PlanInfo(
      title: '周末冲刺',
      newPerDay: 0,
      reviewPerDay: 400,
      window: '09:00–22:00',
      enabled: false,
      description: '只复习不新增，周末启用',
    ),
  ];
}

/// 管理页「算法」列表项。
class AlgorithmInfo {
  const AlgorithmInfo({
    required this.name,
    required this.version,
    required this.description,
    required this.parameters,
    required this.isDefault,
  });

  final String name;
  final String version;
  final String description;

  /// 关键参数摘要，如「阈值 3 · 间隔上限 365 天」。
  final String parameters;
  final bool isDefault;

  static const List<AlgorithmInfo> samples = <AlgorithmInfo>[
    AlgorithmInfo(
      name: 'NSP-0',
      version: '1.0',
      description: '快速筛选用非间隔重复调度器',
      parameters: '阈值 3 · 每日复习',
      isDefault: true,
    ),
    AlgorithmInfo(
      name: 'SM-2',
      version: '1.0',
      description: '第二代 SuperMemo，Anki 的默认调度器',
      parameters: 'EF 1.3–2.5 · 间隔倍数 1.0',
      isDefault: false,
    ),
    AlgorithmInfo(
      name: 'FSRS',
      version: '5.0',
      description: '先进开放间隔重复调度器',
      parameters: '可保留率 0.9 · 权重 19',
      isDefault: false,
    ),
    AlgorithmInfo(
      name: 'SM-15M',
      version: '1.0',
      description: '复杂间隔重复调度器（逆向工程实现）',
      parameters: '最优间隔 · 遗忘曲线拟合',
      isDefault: false,
    ),
  ];
}