import {compose} from '@avocado/core';
import {Vector} from '@avocado/math';

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

const decorate = compose(
  simpleState('isMobile'),
  simpleState('speed'),
)

class MobileBase extends Trait {

  static defaultState() {
    return {
      isMobile: true,
      speed: 0,
    };
  }

  constructor(...args) {
    super(...args);
    this.requestedMovement = [0, 0];
  }

  actions() {
    return {
      requestMovement: (vector) => {
        if (!this.isMobile) {
          return;
        }
        this.requestedMovement = Vector.scale(
          Vector.hypotenuse(vector),
          this.speed
        );
        this.entity.emit('movementRequest', this.requestedMovement);
      },
    }
  }

  listeners() {
    return {
      tick: (elapsed) => {
        if (Vector.isZero(this.requestedMovement)) {
          return;
        }
        const requestedMovement = Vector.scale(
          this.requestedMovement,
          elapsed
        );
        this.requestedMovement = [0, 0];
        this.entity.x += requestedMovement[0];
        this.entity.y += requestedMovement[1];
      },
    }
  }

}

export class Mobile extends decorate(MobileBase) {}