class BuildInfo {
  static const String _date = String.fromEnvironment(
    'IGNIS_BUILD_DATE',
    defaultValue: '',
  );
  static const String _gitSha = String.fromEnvironment(
    'IGNIS_GIT_SHA',
    defaultValue: '',
  );

  static bool get hasMetadata => _date.isNotEmpty && _gitSha.isNotEmpty;

  static String get shortSha {
    if (_gitSha.isEmpty) return 'unknown';
    return _gitSha.length <= 7 ? _gitSha : _gitSha.substring(0, 7);
  }

  static String get formattedDate {
    if (_date.isEmpty) return 'unknown date';

    final parsed = DateTime.tryParse(_date);
    if (parsed == null) return _date;

    final utc = parsed.toUtc();
    final year = utc.year.toString().padLeft(4, '0');
    final month = utc.month.toString().padLeft(2, '0');
    final day = utc.day.toString().padLeft(2, '0');
    final hour = utc.hour.toString().padLeft(2, '0');
    final minute = utc.minute.toString().padLeft(2, '0');
    return '$year-$month-$day $hour:$minute UTC';
  }

  static String get label =>
      hasMetadata ? '$formattedDate · $shortSha' : 'build info unavailable';
}