import { Entity, System, type Cosmic } from "@cosmic/core";
import { Transform, Physics } from "@cosmic/kit/components";

export class PhysicsSystem extends System {
  public requiredComponents = new Set([Transform.name, Physics.name]);
  private worldStore: Map<string, any>;

  constructor(engine: Cosmic) {
    super();
    this.worldStore = engine.getStore("cosmic.world");
  }

  update(entities: Entity[], deltaTime: number) {
    const worldGravityStrength = this.worldStore.get("cosmic.world.gravity.strength") ?? 0;

    entities.forEach((entity) => {
      const transform = entity.getComponent(Transform)!;
      const physics = entity.getComponent(Physics)!;

      transform.y += worldGravityStrength * physics.weight * deltaTime;
    });
  }
}