All files / packages/games/engine/src/systems damage.ts

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import { isAttackComponent, isDamageableComponent, ComponentName } from "../components";
 
import { Actor, Entity } from "../entities";
import { World } from "../world";
import { System } from "./system";
 
export class DamageSystem extends System {
    private readonly attacker: Actor;
    private readonly target: Entity;
 
    public constructor(attacker: Actor, target: Entity) {
        super(new Map(), [ComponentName.DAMAGEABLE]);
 
        this.attacker = attacker;
        this.target = target;
    }
 
    public run(world: World): void {
        const attack = this.attacker.getComponent(ComponentName.ATTACK);
        const component = this.target.getComponent(ComponentName.DAMAGEABLE);
 
        if (isAttackComponent(attack) && isDamageableComponent(component)) {
            const remainingHitPoints = component.takeDamage(attack.getValue());
 
            if (remainingHitPoints <= 0) {
                world.removeEntity(this.target);
            }
        }
    }
}