ActivatablesManager and little cleanup

front/src/Phaser/Game/ActivatablesManager.ts

@@ -0,0 +1,94 @@
+import { isOutlineable } from '../../Utils/CustomTypeGuards';
+import { MathUtils } from '../../Utils/MathUtils';
+import type { Player } from '../Player/Player';
+import type { ActivatableInterface } from './ActivatableInterface';
+
+export class ActivatablesManager {
+
+    // The item that can be selected by pressing the space key.
+    private selectedActivatableObjectByDistance?: ActivatableInterface;
+    private selectedActivatableObjectByPointer?: ActivatableInterface;
+    private activatableObjectsDistances: Map<ActivatableInterface, number> = new Map<ActivatableInterface, number>();
+
+    private currentPlayer: Player;
+    
+    constructor(currentPlayer: Player) {
+        this.currentPlayer = currentPlayer;
+    }
+
+    public handlePointerOverActivatableObject(object: ActivatableInterface): void {
+        if (this.selectedActivatableObjectByPointer === object) {
+            return;
+        }
+        if (isOutlineable(this.selectedActivatableObjectByDistance)) {
+            this.selectedActivatableObjectByDistance?.characterFarAwayOutline();
+        }
+        if (isOutlineable(this.selectedActivatableObjectByPointer)) {
+            this.selectedActivatableObjectByPointer?.pointerOutOutline();
+        }
+        this.selectedActivatableObjectByPointer = object;
+        if (isOutlineable(this.selectedActivatableObjectByPointer)) {
+            this.selectedActivatableObjectByPointer?.pointerOverOutline();
+        }
+    }
+
+    public handlePointerOutActivatableObject(): void {
+        if (isOutlineable(this.selectedActivatableObjectByPointer)) {
+            this.selectedActivatableObjectByPointer?.pointerOutOutline();
+        }
+        this.selectedActivatableObjectByPointer = undefined;
+        if (isOutlineable(this.selectedActivatableObjectByDistance)) {
+            this.selectedActivatableObjectByDistance?.characterCloseByOutline();
+        }
+    }
+
+    public getSelectedActivatableObject(): ActivatableInterface | undefined {
+        return this.selectedActivatableObjectByPointer ?? this.selectedActivatableObjectByDistance;
+    }
+
+    public deduceSelectedActivatableObjectByDistance(): void {
+        const newNearestObject = this.findNearestActivatableObject();
+        if (this.selectedActivatableObjectByDistance === newNearestObject) {
+            return;
+        }
+        // update value but do not change the outline
+        if (this.selectedActivatableObjectByPointer) {
+            this.selectedActivatableObjectByDistance = newNearestObject;
+            return;    
+        }
+        if (isOutlineable(this.selectedActivatableObjectByDistance)) {
+            this.selectedActivatableObjectByDistance?.characterFarAwayOutline();
+        }
+        this.selectedActivatableObjectByDistance = newNearestObject;
+        if (isOutlineable(this.selectedActivatableObjectByDistance)) {
+            this.selectedActivatableObjectByDistance?.characterCloseByOutline();
+        }
+    }
+
+    private findNearestActivatableObject(): ActivatableInterface | undefined {
+        let shortestDistance: number = Infinity;
+        let closestObject: ActivatableInterface | undefined = undefined;
+
+        for (const [object, distance] of this.activatableObjectsDistances.entries()) {
+            if (object.activationRadius > distance && shortestDistance > distance) {
+                shortestDistance = distance;
+                closestObject = object;
+            }
+        }
+        return closestObject;
+    }
+    public updateActivatableObjectsDistances(objects: ActivatableInterface[]): void {
+        const currentPlayerPos = this.currentPlayer.getPosition();
+        for (const object of objects) {
+            const distance = MathUtils.distanceBetween(currentPlayerPos, object.getPosition());
+            this.activatableObjectsDistances.set(object, distance);
+        }
+    }
+
+    public updateDistanceForSingleActivatableObject(object: ActivatableInterface): void {
+        this.activatableObjectsDistances.set(
+            object,
+            MathUtils.distanceBetween(this.currentPlayer.getPosition(), object.getPosition()),
+        );
+    }
+}