Folder structure

assets/Scripts/Game/Unit/UnitLevel.ts

@@ -0,0 +1,46 @@
+import { ISignal } from "../../Services/EventSystem/ISignal";
+import { Signal } from "../../Services/EventSystem/Signal";
+
+export class UnitLevel {
+    private xp = 0;
+    private requiredXPs: number[];
+    private currentLevel = 0;
+    private levelUpEvent: Signal<number> = new Signal<number>();
+    private xpAddedEvent: Signal<number> = new Signal<number>();
+
+    public constructor(requiredXPs: number[]) {
+        this.requiredXPs = requiredXPs;
+    }
+
+    public addXp(points: number): void {
+        this.xp += points;
+        this.xpAddedEvent.trigger(this.xp);
+        this.tryLevelUp();
+    }
+
+    public get XP(): number {
+        return this.xp;
+    }
+
+    public get RequiredXP(): number {
+        return this.requiredXPs[this.currentLevel];
+    }
+
+    public get LevelUpEvent(): ISignal<number> {
+        return this.levelUpEvent;
+    }
+
+    public get XpAddedEvent(): ISignal<number> {
+        return this.xpAddedEvent;
+    }
+
+    private tryLevelUp(): void {
+        if (this.requiredXPs.length <= this.currentLevel) return;
+        if (this.xp < this.requiredXPs[this.currentLevel]) return;
+
+        this.xp -= this.requiredXPs[this.currentLevel];
+        this.currentLevel++;
+
+        this.levelUpEvent.trigger(this.currentLevel);
+    }
+}