final class LauncherGameTicket {
  static final RegExp _accountPattern = RegExp(r'^[A-Z0-9]{3,16}$');
  static final RegExp _ticketPattern = RegExp(r'^[A-Z0-9]{16}$');

  final String account;
  final String ticket;
  final DateTime expiresAt;

  const LauncherGameTicket({
    required this.account,
    required this.ticket,
    required this.expiresAt,
  });

  factory LauncherGameTicket.fromJson(Map<String, dynamic> json) {
    final rawAccount = json['account'];
    final rawTicket = json['ticket'];
    final rawExpiresAt = json['expires_at'];
    if (rawAccount is! String ||
        rawTicket is! String ||
        rawExpiresAt is! String) {
      throw const FormatException('Invalid game ticket payload types.');
    }

    final account = rawAccount;
    final ticket = rawTicket;
    final expiresAt = DateTime.tryParse(rawExpiresAt);

    if (!_accountPattern.hasMatch(account)) {
      throw const FormatException('Invalid game ticket account.');
    }
    if (!_ticketPattern.hasMatch(ticket)) {
      throw const FormatException('Invalid game ticket value.');
    }
    if (expiresAt == null) {
      throw const FormatException('Invalid game ticket expiration.');
    }

    return LauncherGameTicket(
      account: account,
      ticket: ticket,
      expiresAt: expiresAt.toUtc(),
    );
  }

  bool isUsable({
    DateTime? now,
    Duration minimumValidity = const Duration(seconds: 5),
  }) {
    final currentTime = (now ?? DateTime.now()).toUtc();
    return expiresAt.isAfter(currentTime.add(minimumValidity));
  }
}