/// Achievement types for tracking progress
enum AchievementType {
  sessionCount, // Total number of completed sessions
  distractionCount, // Total number of recorded distractions
  totalMinutes, // Total minutes of focus time
  consecutiveDays, // Consecutive check-in days
}

/// Configuration for a single achievement
class AchievementConfig {
  final String id;
  final String nameKey; // Localization key for name
  final String descKey; // Localization key for description
  final String icon; // Emoji icon
  final AchievementType type;
  final int requiredValue;
  final int bonusPoints; // Points awarded when unlocked

  const AchievementConfig({
    required this.id,
    required this.nameKey,
    required this.descKey,
    required this.icon,
    required this.type,
    required this.requiredValue,
    required this.bonusPoints,
  });

  /// All available achievements in the app
  static List<AchievementConfig> get all => [
        // First session
        const AchievementConfig(
          id: 'first_session',
          nameKey: 'achievement_first_session_name',
          descKey: 'achievement_first_session_desc',
          icon: '🎖️',
          type: AchievementType.sessionCount,
          requiredValue: 1,
          bonusPoints: 10,
        ),

        // Session milestones
        const AchievementConfig(
          id: 'sessions_10',
          nameKey: 'achievement_sessions_10_name',
          descKey: 'achievement_sessions_10_desc',
          icon: '⭐',
          type: AchievementType.sessionCount,
          requiredValue: 10,
          bonusPoints: 50,
        ),

        const AchievementConfig(
          id: 'sessions_50',
          nameKey: 'achievement_sessions_50_name',
          descKey: 'achievement_sessions_50_desc',
          icon: '🌟',
          type: AchievementType.sessionCount,
          requiredValue: 50,
          bonusPoints: 200,
        ),

        const AchievementConfig(
          id: 'sessions_100',
          nameKey: 'achievement_sessions_100_name',
          descKey: 'achievement_sessions_100_desc',
          icon: '💫',
          type: AchievementType.sessionCount,
          requiredValue: 100,
          bonusPoints: 500,
        ),

        // Honesty tracking series (KEY INNOVATION)
        const AchievementConfig(
          id: 'honest_bronze',
          nameKey: 'achievement_honest_bronze_name',
          descKey: 'achievement_honest_bronze_desc',
          icon: '🧠',
          type: AchievementType.distractionCount,
          requiredValue: 50,
          bonusPoints: 50,
        ),

        const AchievementConfig(
          id: 'honest_silver',
          nameKey: 'achievement_honest_silver_name',
          descKey: 'achievement_honest_silver_desc',
          icon: '🧠',
          type: AchievementType.distractionCount,
          requiredValue: 200,
          bonusPoints: 100,
        ),

        const AchievementConfig(
          id: 'honest_gold',
          nameKey: 'achievement_honest_gold_name',
          descKey: 'achievement_honest_gold_desc',
          icon: '🧠',
          type: AchievementType.distractionCount,
          requiredValue: 500,
          bonusPoints: 300,
        ),

        // Focus time milestones
        const AchievementConfig(
          id: 'focus_5h',
          nameKey: 'achievement_focus_5h_name',
          descKey: 'achievement_focus_5h_desc',
          icon: '⏱️',
          type: AchievementType.totalMinutes,
          requiredValue: 300, // 5 hours
          bonusPoints: 100,
        ),

        const AchievementConfig(
          id: 'focus_25h',
          nameKey: 'achievement_focus_25h_name',
          descKey: 'achievement_focus_25h_desc',
          icon: '⏰',
          type: AchievementType.totalMinutes,
          requiredValue: 1500, // 25 hours
          bonusPoints: 300,
        ),

        const AchievementConfig(
          id: 'focus_100h',
          nameKey: 'achievement_focus_100h_name',
          descKey: 'achievement_focus_100h_desc',
          icon: '👑',
          type: AchievementType.totalMinutes,
          requiredValue: 6000, // 100 hours
          bonusPoints: 1000,
        ),

        // Check-in streaks
        const AchievementConfig(
          id: 'streak_3',
          nameKey: 'achievement_streak_3_name',
          descKey: 'achievement_streak_3_desc',
          icon: '🔥',
          type: AchievementType.consecutiveDays,
          requiredValue: 3,
          bonusPoints: 20,
        ),

        const AchievementConfig(
          id: 'streak_7',
          nameKey: 'achievement_streak_7_name',
          descKey: 'achievement_streak_7_desc',
          icon: '🔥',
          type: AchievementType.consecutiveDays,
          requiredValue: 7,
          bonusPoints: 50,
        ),

        const AchievementConfig(
          id: 'streak_30',
          nameKey: 'achievement_streak_30_name',
          descKey: 'achievement_streak_30_desc',
          icon: '🔥',
          type: AchievementType.consecutiveDays,
          requiredValue: 30,
          bonusPoints: 200,
        ),

        const AchievementConfig(
          id: 'streak_100',
          nameKey: 'achievement_streak_100_name',
          descKey: 'achievement_streak_100_desc',
          icon: '🔥',
          type: AchievementType.consecutiveDays,
          requiredValue: 100,
          bonusPoints: 1000,
        ),
      ];

  /// Get achievement by ID
  static AchievementConfig? getById(String id) {
    try {
      return all.firstWhere((achievement) => achievement.id == id);
    } catch (e) {
      return null;
    }
  }

  /// Get all achievements of a specific type
  static List<AchievementConfig> getByType(AchievementType type) {
    return all.where((achievement) => achievement.type == type).toList();
  }
}