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

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

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

class MobileBase extends Trait {

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

  initialize() {
    this.requestedMovement = [0, 0];
  }

  methods() {
    return {

      applyMovement: (movement) => {
        this.entity.x += movement[0];
        this.entity.y += movement[1];
      },

      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;
        }
        if (this.entity.is('physical')) {
          this.entity.applyImpulse(this.requestedMovement, elapsed);
        }
        else {
          const requestedMovement = Vector.scale(
            this.requestedMovement,
            elapsed
          );
          this.entity.applyMovement(requestedMovement);
        }
        this.requestedMovement = [0, 0];
      },
    }
  }

}

export class Mobile extends decorate(MobileBase) {}