feat: implementing logic

lib/game/bloc/game_bloc.dart

@@ -10,6 +10,7 @@ part 'game_state.dart';
 class GameBloc extends Bloc<GameEvent, GameState> {
   GameBloc() : super(const GameState.initial()) {
     on<BallLost>(_onBallLost);
+    on<BonusBallLost>(_onBonusBallLost);
     on<Scored>(_onScored);
     on<BonusLetterActivated>(_onBonusLetterActivated);
     on<DashNestActivated>(_onDashNestActivated);
@@ -19,9 +20,11 @@ class GameBloc extends Bloc<GameEvent, GameState> {
   static const bonusWordScore = 10000;
 
   void _onBallLost(BallLost event, Emitter emit) {
-    if (state.balls > 0) {
     emit(state.copyWith(balls: state.balls - 1));
   }
+
+  void _onBonusBallLost(BonusBallLost event, Emitter emit) {
+    emit(state.copyWith(bonusBalls: state.bonusBalls - 1));
   }
 
   void _onScored(Scored event, Emitter emit) {

lib/game/components/wall.dart

@@ -71,12 +71,12 @@ class BottomWall extends Wall {
 }
 
 /// {@template bottom_wall_ball_contact_callback}
-/// Listens when a [Ball] falls into a [BottomWall].
+/// Listens when a [ControlledBall] falls into a [BottomWall].
 /// {@endtemplate}
-class BottomWallBallContactCallback extends ContactCallback<Ball, BottomWall> {
+class BottomWallBallContactCallback
+    extends ContactCallback<ControlledBall, BottomWall> {
   @override
-  void begin(Ball ball, BottomWall wall, Contact contact) {
+  void begin(ControlledBall ball, BottomWall wall, Contact contact) {
-    // TODO(alestiago): replace with .firstChild when available.
+    ball.controller.lost();
-    ball.children.whereType<BallController>().first.lost();
   }
 }

lib/game/pinball_game.dart

@@ -30,21 +30,23 @@ class PinballGame extends Forge2DGame
 
   final PinballAudio audio;
 
-  @override
-  void onAttach() {
-    super.onAttach();
-    controller.spawnBall();
-  }
-
   @override
   Future<void> onLoad() async {
-    await super.onLoad();
     _addContactCallbacks();
+    // Fix camera on the center of the board.
+    camera
+      ..followVector2(Vector2(0, -7.8))
+      ..zoom = size.y / 16;
 
     await _addGameBoundaries();
     unawaited(addFromBlueprint(Boundaries()));
     unawaited(addFromBlueprint(LaunchRamp()));
-    unawaited(_addPlunger());
+
+    final plunger = Plunger(compressionDistance: 29)
+      ..initialPosition =
+          BoardDimensions.bounds.center.toVector2() + Vector2(41.5, -49);
+    await add(plunger);
+
     unawaited(add(Board()));
     unawaited(addFromBlueprint(DinoWalls()));
     unawaited(_addBonusWord());
@@ -62,10 +64,8 @@ class PinballGame extends Forge2DGame
       ),
     );
 
-    // Fix camera on the center of the board.
+    controller.attachTo(plunger);
-    camera
+    await super.onLoad();
-      ..followVector2(Vector2(0, -7.8))
-      ..zoom = size.y / 16;
   }
 
   void _addContactCallbacks() {
@@ -79,13 +79,6 @@ class PinballGame extends Forge2DGame
     createBoundaries(this).forEach(add);
   }
 
-  Future<void> _addPlunger() async {
-    final plunger = Plunger(compressionDistance: 29)
-      ..initialPosition =
-          BoardDimensions.bounds.center.toVector2() + Vector2(41.5, -49);
-    await add(plunger);
-  }
-
   Future<void> _addBonusWord() async {
     await add(
       BonusWord(
@@ -102,9 +95,10 @@ class _GameBallsController extends ComponentController<PinballGame>
     with BlocComponent<GameBloc, GameState>, HasGameRef<PinballGame> {
   _GameBallsController(PinballGame game) : super(game);
 
+  Plunger? _plunger;
+
   @override
   bool listenWhen(GameState? previousState, GameState newState) {
-    // TODO(alestiago): Fix how the logic works.
     final previousBalls =
         (previousState?.balls ?? 0) + (previousState?.bonusBalls ?? 0);
     final currentBalls = newState.balls + newState.bonusBalls;
@@ -119,20 +113,29 @@ class _GameBallsController extends ComponentController<PinballGame>
     spawnBall();
   }
 
-  Future<void> spawnBall() async {
+  @override
-    // TODO(alestiago): Remove once this logic is moved to controller.
+  Future<void> onLoad() async {
-    var plunger = firstChild<Plunger>();
+    await super.onLoad();
-    if (plunger == null) {
+    spawnBall();
-      await add(plunger = Plunger(compressionDistance: 1));
   }
 
+  void spawnBall() {
+    if (_plunger == null) return;
+
     final ball = ControlledBall.launch(
       theme: gameRef.theme,
     )..initialPosition = Vector2(
-        plunger.body.position.x,
+        _plunger!.body.position.x,
-        plunger.body.position.y + Ball.size.y,
+        _plunger!.body.position.y + Ball.size.y,
       );
-    await add(ball);
+    component.add(ball);
+  }
+
+  /// Attaches the controller to the plunger.
+  // TODO(alestiago): Remove this method and use onLoad instead.
+  // ignore: use_setters_to_change_properties
+  void attachTo(Plunger plunger) {
+    _plunger = plunger;
   }
 }