/// Central configuration of the backend Rest API (.Net Web API).
///
/// The API is reached over plain http because it only ever gets called
/// inside of a trusted network.
class ApiConfig {
  const ApiConfig({
    this.scheme = 'http',
    this.host = '10.10.50.30',
    this.port = 12781,
    this.basePath = '',
    this.timeout = const Duration(seconds: 15),
    this.defaultHeaders = const {},
  });

  final String scheme;
  final String host;
  final int? port;

  /// Optional prefix in front of every controller route, e.g. `api`.
  final String basePath;

  final Duration timeout;
  final Map<String, String> defaultHeaders;

  /// Default configuration used by [AcApi] when nothing else is provided.
  static const ApiConfig development = ApiConfig();

  ApiConfig copyWith({
    String? scheme,
    String? host,
    int? port,
    String? basePath,
    Duration? timeout,
    Map<String, String>? defaultHeaders,
  }) {
    return ApiConfig(
      scheme: scheme ?? this.scheme,
      host: host ?? this.host,
      port: port ?? this.port,
      basePath: basePath ?? this.basePath,
      timeout: timeout ?? this.timeout,
      defaultHeaders: defaultHeaders ?? this.defaultHeaders,
    );
  }

  /// Builds an absolute [Uri] for a controller route like `agents`.
  Uri buildUri(String path, [Map<String, dynamic>? queryParameters]) {
    final segments = <String>[
      ...basePath.split('/'),
      ...path.split('/'),
    ].where((segment) => segment.isNotEmpty).toList();

    Map<String, String>? query;
    if (queryParameters != null && queryParameters.isNotEmpty) {
      query = <String, String>{};
      queryParameters.forEach((key, value) {
        if (value != null) {
          query![key] = value.toString();
        }
      });
      if (query.isEmpty) {
        query = null;
      }
    }

    return Uri(
      scheme: scheme,
      host: host,
      port: port,
      pathSegments: segments,
      queryParameters: query,
    );
  }
}