import {compose, virtualize} from '@avocado/core';

const decorate = compose(
  virtualize([
    'addBody',
    'createBody',
  ]),
);

class AbstractWorldBase {

  constructor() {
    this.entities = new Map();
  }

  associateBodyWithEntity(body, entity) {
    this.entities.set(body, entity);
    body.position = entity.position;
  }

  removeBody(body) {
    this.entities.delete(body);
  }

  tick(elapsed) {
    // Propagate position updates.
    for (const entity of this.entities.values()) {
      entity.position = entity.body.position;
    }
  }

}

export class AbstractWorld extends decorate(AbstractWorldBase) {}