app-boilerplate/lib/config/app_config.dart

/// Configuration class that holds application settings.
/// 
/// This class contains environment-specific configuration values
/// such as API base URL, Immich settings, and logging settings.
class AppConfig {
  /// The base URL for API requests.
  final String apiBaseUrl;

  /// Whether logging is enabled in the application.
  final bool enableLogging;

  /// Immich server base URL (e.g., 'https://immich.example.com').
  final String immichBaseUrl;

  /// Immich API key for authentication.
  final String immichApiKey;

  /// List of Nostr relay URLs for testing and production.
  final List<String> nostrRelays;

  /// Creates an [AppConfig] instance with the provided values.
  /// 
  /// [apiBaseUrl] - The base URL for API requests.
  /// [enableLogging] - Whether logging should be enabled.
  /// [immichBaseUrl] - Immich server base URL.
  /// [immichApiKey] - Immich API key for authentication.
  /// [nostrRelays] - List of Nostr relay URLs (e.g., ['wss://relay.example.com']).
  const AppConfig({
    required this.apiBaseUrl,
    required this.enableLogging,
    required this.immichBaseUrl,
    required this.immichApiKey,
    required this.nostrRelays,
  });

  @override
  String toString() {
    return 'AppConfig(apiBaseUrl: $apiBaseUrl, enableLogging: $enableLogging, '
        'immichBaseUrl: $immichBaseUrl, nostrRelays: ${nostrRelays.length})';
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is AppConfig &&
        other.apiBaseUrl == apiBaseUrl &&
        other.enableLogging == enableLogging &&
        other.immichBaseUrl == immichBaseUrl &&
        other.immichApiKey == immichApiKey &&
        other.nostrRelays.toString() == nostrRelays.toString();
  }

  @override
  int get hashCode =>
      apiBaseUrl.hashCode ^
      enableLogging.hashCode ^
      immichBaseUrl.hashCode ^
      immichApiKey.hashCode ^
      nostrRelays.hashCode;
}