import {compose} from '@avocado/core';
import {hasGraphics, Container} from '@avocado/graphics';

import {simpleState, Trait} from '../trait';

const decorate = compose(
);

class GraphicalBase extends Trait {

  static defaultParams() {
    return {
      trackPosition: true,
    };
  }

  initialize() {
    if (hasGraphics) {
      this._container = new Container();
    }
    this.trackPosition = this.params.get('trackPosition');
    if (this.shouldSynchronizePosition()) {
      this.synchronizePosition();
    }
  }

  get container() {
    return this._container;
  }

  shouldSynchronizePosition() {
    return hasGraphics && this.trackPosition;
  }

  synchronizePosition() {
    if (!('position' in this.entity)) {
      return;
    }
    this.entity.container.position = this.entity.position;
  }

  listeners() {
    const listeners = {};
    if (this.shouldSynchronizePosition()) {
      listeners.traitAdded = (trait) => {
        if ('positioned' !== trait.constructor.type()) {
          return;
        }
        this.synchronizePosition();
      };
      listeners.positionChanged = () => {
        this.synchronizePosition();
      };
    }
    return listeners;
  }

}

export class Graphical extends decorate(GraphicalBase) {}