/**
 * Touch-to-move-forward controls for mobile.
 */

if( !AFRAME.components['touch-controls'] ){

  AFRAME.registerComponent('touch-controls', {
    schema: {
      axis: { default: "z", "type":"string" },
      enabled: { default: true },
      reverseEnabled: { default: true }
    },

    init: function () {
      this.dVelocity = new THREE.Vector3();
      this.bindMethods();
      this.direction = 0;
    },

    play: function () {
      this.addEventListeners();
    },

    pause: function () {
      this.removeEventListeners();
      this.dVelocity.set(0, 0, 0);
    },

    remove: function () {
      this.pause();
    },

    addEventListeners: function () {
      const sceneEl = this.el.sceneEl;
      const canvasEl = sceneEl.canvas;

      if (!canvasEl) {
        sceneEl.addEventListener('render-target-loaded', this.addEventListeners.bind(this));
        return;
      }

      canvasEl.addEventListener('touchstart', this.onTouchStart);
      canvasEl.addEventListener('touchend', this.onTouchEnd);
      const vrModeUI = sceneEl.getAttribute('vr-mode-ui');
      if (vrModeUI && vrModeUI.cardboardModeEnabled) {
        sceneEl.addEventListener('enter-vr', this.onEnterVR);
      }
    },

    removeEventListeners: function () {
      const canvasEl = this.el.sceneEl && this.el.sceneEl.canvas;
      if (!canvasEl) { return; }

      canvasEl.removeEventListener('touchstart', this.onTouchStart);
      canvasEl.removeEventListener('touchend', this.onTouchEnd);
      this.el.sceneEl.removeEventListener('enter-vr', this.onEnterVR)
    },

    isVelocityActive: function () {
      return this.data.enabled && !!this.direction;
    },

    getVelocityDelta: function () {
      this.dVelocity[ this.data.axis ] = this.direction;
      return this.dVelocity.clone();
    },

    bindMethods: function () {
      this.onTouchStart = this.onTouchStart.bind(this);
      this.onTouchEnd = this.onTouchEnd.bind(this);
      this.onEnterVR = this.onEnterVR.bind(this);
    },

    onTouchStart: function (e) {
      this.direction = 0;
      if (this.data.reverseEnabled && e.touches ){
        if( e.touches.length === 3) this.direction = 1;
        if( e.touches.length === 2) this.direction = -1;
      }
      //e.preventDefault();
    },

    onTouchEnd: function (e) {
      this.direction = 0;
      //e.preventDefault();
    },

    onEnterVR: function () {
      // This is to make the Cardboard button on Chrome Android working
      //const xrSession = this.el.sceneEl.xrSession;
      //if (!xrSession) { return; }
      //xrSession.addEventListener('selectstart', this.onTouchStart);
      //xrSession.addEventListener('selectend', this.onTouchEnd);
    }
  })
}