feat: ball added event to game bloc

lib/game/bloc/game_bloc.dart

@@ -9,6 +9,7 @@ part 'game_state.dart';
 
 class GameBloc extends Bloc<GameEvent, GameState> {
   GameBloc() : super(const GameState.initial()) {
+    on<BallAdded>(_onBallAdded);
     on<BallLost>(_onBallLost);
     on<Scored>(_onScored);
     on<MultiplierIncreased>(_onIncreasedMultiplier);
@@ -16,16 +17,21 @@ class GameBloc extends Bloc<GameEvent, GameState> {
     on<SparkyTurboChargeActivated>(_onSparkyTurboChargeActivated);
   }
 
+  void _onBallAdded(BallAdded event, Emitter emit) {
+    emit(
+      state.copyWith(balls: state.balls + 1),
+    );
+  }
+
   void _onBallLost(BallLost event, Emitter emit) {
     var score = state.score;
     var multiplier = state.multiplier;
-    var ballsLeft = event.ballsLeft;
+    final ballsLeft = math.max(state.balls - 1, 0);
     var roundsLeft = state.rounds;
 
     if (ballsLeft < 1) {
       score = score * state.multiplier;
       multiplier = 1;
-      ballsLeft = 1;
       roundsLeft = state.rounds - 1;
     }
 

lib/game/bloc/game_event.dart

@@ -7,19 +7,26 @@ abstract class GameEvent extends Equatable {
   const GameEvent();
 }
 
+/// {@template ball_added_game_event}
+/// Event added when a ball is spawn to the board.
+/// {@endtemplate}
+class BallAdded extends GameEvent {
+  /// {@macro ball_added_game_event}
+  const BallAdded();
+
+  @override
+  List<Object?> get props => [];
+}
+
 /// {@template ball_lost_game_event}
 /// Event added when a user drops a ball off the screen.
 /// {@endtemplate}
 class BallLost extends GameEvent {
   /// {@macro ball_lost_game_event}
-  const BallLost({
+  const BallLost();
-    required this.ballsLeft,
-  }) : assert(ballsLeft >= 0, "Balls left can't be negative");
-
-  final int ballsLeft;
 
   @override
-  List<Object?> get props => [ballsLeft];
+  List<Object?> get props => [];
 }
 
 /// {@template scored_game_event}

lib/game/bloc/game_state.dart

@@ -33,7 +33,7 @@ class GameState extends Equatable {
   const GameState.initial()
       : score = 0,
         multiplier = 1,
-        balls = 1,
+        balls = 0,
         rounds = 3,
         bonusHistory = const [];
 
@@ -43,7 +43,7 @@ class GameState extends Equatable {
   /// The current multiplier for the score.
   final int multiplier;
 
-  /// The number of balls left in the game.
+  /// The number of balls left in each round.
   ///
   /// When the number of balls is 0, round is lost.
   final int balls;

lib/game/components/controlled_ball.dart

@@ -75,7 +75,12 @@ class BallController extends ComponentController<Ball>
   @override
   void onRemove() {
     super.onRemove();
-    final remainingBalls = gameRef.children.whereType<Ball>().length;
+    gameRef.read<GameBloc>().add(const BallLost());
-    gameRef.read<GameBloc>().add(BallLost(ballsLeft: remainingBalls));
+  }
+
+  @override
+  Future<void>? onLoad() {
+    gameRef.read<GameBloc>().add(const BallAdded());
+    return super.onLoad();
   }
 }

lib/game/pinball_game.dart

@@ -99,8 +99,11 @@ class _GameBallsController extends ComponentController<PinballGame>
 
   @override
   bool listenWhen(GameState? previousState, GameState newState) {
-    final noBallsLeft = component.descendants().whereType<Ball>().isEmpty;
+    //final noBallsLeft = component.descendants().whereType<Ball>().isEmpty;
-    final canBallRespawn = newState.balls > 0;
+    //final canBallRespawn = newState.balls > 0;
+
+    final noBallsLeft = newState.balls == 0;
+    final canBallRespawn = newState.rounds > 0;
 
     return noBallsLeft && canBallRespawn;
   }