/// یک تورنومنتِ امتیازی (از GET /api/tournaments).
class Tournament {
  final int id;
  final String title;
  final String description;
  final int entryFee;
  final List<int> prizes;
  final int prizePool;
  final String status; // upcoming | active | ended
  final String startsAt;
  final String endsAt;
  final String startsLocal; // به وقتِ تهران (نمایشی)
  final String endsLocal;
  final int players;
  final bool joined;
  final int myPoints;
  final int myRank; // ۰ یعنی رتبه‌ای ندارد

  const Tournament({
    required this.id,
    required this.title,
    required this.description,
    required this.entryFee,
    required this.prizes,
    required this.prizePool,
    required this.status,
    required this.startsAt,
    required this.endsAt,
    required this.startsLocal,
    required this.endsLocal,
    required this.players,
    required this.joined,
    required this.myPoints,
    required this.myRank,
  });

  bool get isActive => status == 'active';
  bool get isUpcoming => status == 'upcoming';
  bool get isEnded => status == 'ended';
  bool get canJoin => !joined && !isEnded;

  factory Tournament.fromJson(Map<String, dynamic> j) => Tournament(
        id: (j['id'] ?? 0) as int,
        title: (j['title'] ?? '') as String,
        description: (j['description'] ?? '') as String,
        entryFee: (j['entry_fee'] ?? 0) as int,
        prizes: ((j['prizes'] as List?) ?? const [])
            .map((e) => (e ?? 0) as int)
            .toList(),
        prizePool: (j['prize_pool'] ?? 0) as int,
        status: (j['status'] ?? 'ended') as String,
        startsAt: (j['starts_at'] ?? '') as String,
        endsAt: (j['ends_at'] ?? '') as String,
        startsLocal: (j['starts_local'] ?? '') as String,
        endsLocal: (j['ends_local'] ?? '') as String,
        players: (j['players'] ?? 0) as int,
        joined: (j['joined'] ?? false) as bool,
        myPoints: (j['my_points'] ?? 0) as int,
        myRank: (j['my_rank'] ?? 0) as int,
      );
}

/// یک ردیفِ جدولِ رده‌بندیِ تورنومنت.
class TournamentStanding {
  final int rank;
  final int userId;
  final String name;
  final String avatar;
  final int points;
  final int wins;
  final int games;
  final int prize;

  const TournamentStanding({
    required this.rank,
    required this.userId,
    required this.name,
    required this.avatar,
    required this.points,
    required this.wins,
    required this.games,
    required this.prize,
  });

  /// seedِ آواتار: آواتارِ انتخابی، وگرنه نام.
  String get avatarSeed => avatar.isNotEmpty ? avatar : name;

  factory TournamentStanding.fromJson(Map<String, dynamic> j) =>
      TournamentStanding(
        rank: (j['rank'] ?? 0) as int,
        userId: (j['user_id'] ?? 0) as int,
        name: (j['name'] ?? '') as String,
        avatar: (j['avatar'] ?? '') as String,
        points: (j['points'] ?? 0) as int,
        wins: (j['wins'] ?? 0) as int,
        games: (j['games'] ?? 0) as int,
        prize: (j['prize'] ?? 0) as int,
      );
}