import * as I from 'immutable';

import {Trait} from '@avocado/entity';

// Input handling.
export class Controllable extends Trait {

  initialize() {
    this._inputState = I.Set();
  }

  listeners() {
    return {
      tick: (elapsed) => {
        const {_inputState: inputState} = this;
        if (0 === inputState.size) {
          this.entity.currentAnimation = 'idle';
          return;
        }
        const movementVector = [0, 0];
        if (inputState.has('MoveUp')) {
          movementVector[1] -= 1;
        }
        if (inputState.has('MoveRight')) {
          movementVector[0] += 1;
        }
        if (inputState.has('MoveDown')) {
          movementVector[1] += 1;
        }
        if (inputState.has('MoveLeft')) {
          movementVector[0] -= 1;
        }
        if (0 === movementVector[0] && 0 === movementVector[1]) {
          return;
        }
        this.entity.requestMovement(movementVector);
        this.entity.currentAnimation = 'moving';
      },
    }
  }

  set inputState(inputState) {
    this._inputState = I.Set(inputState);
  }

}