mchess-client/lib/connection_cubit/connection_cubit.dart

import 'package:flutter_bloc/flutter_bloc.dart';

import '../connection/ws_connection.dart';

class ConnectionCubit extends Cubit<ConnectionCubitState> {
  static final ConnectionCubit _instance = ConnectionCubit._internal();

  ConnectionCubit._internal() : super(ConnectionCubitState.init());

  factory ConnectionCubit.getInstance() {
    return ConnectionCubit();
  }

  factory ConnectionCubit() {
    return _instance;
  }

  void connect(String playerID, String? passphrase) {
    var connectedFuture =
        ServerConnection.getInstance().connect(playerID, passphrase);

    connectedFuture?.then((val) {
      emit(ConnectionCubitState(
          iAmConnected: true,
          connectedToPhrase: passphrase,
          opponentConnected: false));
    });
  }

  void connectIfNotConnected(String playerID, String? passphrase) {
    if (state.iAmConnected && state.connectedToPhrase == passphrase) {
      return;
    }
    if (state.iAmConnected && state.connectedToPhrase != passphrase) {
      disonnect().then((val) {
        connect(playerID, passphrase);
      });
    }

    connect(playerID, passphrase);
  }

  Future disonnect() async {
    var disconnectFuture =
        ServerConnection.getInstance().disconnectExistingConnection();

    disconnectFuture.then(
      (val) {
        emit(ConnectionCubitState.init());
      },
    );

    return disconnectFuture;
  }

  void opponentConnected() {
    emit(ConnectionCubitState(
        iAmConnected: state.iAmConnected,
        connectedToPhrase: state.connectedToPhrase,
        opponentConnected: true));
  }
}

class ConnectionCubitState {
  final bool iAmConnected;
  final String? connectedToPhrase;
  final bool opponentConnected;

  ConnectionCubitState(
      {required this.iAmConnected,
      required this.connectedToPhrase,
      required this.opponentConnected});

  factory ConnectionCubitState.init() {
    return ConnectionCubitState(
        iAmConnected: false, connectedToPhrase: null, opponentConnected: false);
  }
}