// build_expiry_info.dart - 簡易実装（ビルド情報管理）
class BuildExpiryInfo {
  static const String info = '販売アシスト 1 号';
  static final List<Map<String, dynamic>> expiryDates = <Map<String, dynamic>>[];

  factory BuildExpiryInfo({required DateTime buildDateTime}) => BuildExpiryInfo._(buildDateTime: buildDateTime);

  BuildExpiryInfo._({required this.buildDateTime});

  final DateTime buildDateTime;

  bool isExpired() {
    final now = DateTime.now().toUtc();
    final expiry = buildDateTime.add(const Duration(days: 90));
    return now.isAfter(expiry);
  }

  Map<String, dynamic> toMap() => {'info': info, 'buildDate': '${buildDateTime.toIso8601String()}'};

  String toString() => '$info (ビルド日：${buildDateTime.toLocal()}, 有効期限：${isExpired() ? "終了" : "有効"})';
}

class ExpiredApp {
  final BuildExpiryInfo info;

  ExpiredApp(this.info);

  Widget build(BuildContext context) => Scaffold(
    appBar: AppBar(title: const Text('販売アシスト 1 号')),
    body: Center(child: Text(info.toString())),
  );

  @override
  String toString() => 'ExpiredApp: ${info.toString()}';
}