import { DebouncePublisher } from "./debounce_publisher";
import { EntityPositionUpdateEvent, EventPublisher, EventType } from "./events";
import { Game } from "./game";
import { System, SystemType } from "./system";

export class InputSystem extends System {
  private readonly controllable_entities: Set<string> = new Set();
  private readonly mouse_movement_debouncer: DebouncePublisher<{
    x: number;
    y: number;
  }>;

  constructor(
    private readonly message_publisher: EventPublisher,
    target: HTMLElement,
  ) {
    super(SystemType.INPUT);

    this.mouse_movement_debouncer = new DebouncePublisher((data) =>
      this.publish_mouse_movement(data),
    );

    target.addEventListener("mousemove", (event) => {
      this.mouse_movement_debouncer.update({
        x: event.clientX,
        y: event.clientY,
      });
    });
  }

  private publish_mouse_movement({ x, y }: { x: number; y: number }) {
    console.log(`publishing mouse movement at (${x}, ${y})`);
    for (const entity_id of this.controllable_entities) {
      this.message_publisher.add({
        event_type: EventType.ENTITY_POSITION_UPDATE,
        data: {
          id: entity_id,
          position: { x, y },
        },
      } as EntityPositionUpdateEvent);
    }
  }

  public add_controllable_entity(entity_id: string) {
    this.controllable_entities.add(entity_id);
  }

  public update(_dt: number, _game: Game) {}
}