// wrapper to survive in/outside modules

xrf.InteractiveGroup = function(THREE,renderer,camera){

  let {
    Group,
    Matrix4,
    Raycaster,
    Vector2
  } = THREE 

  const _pointer = new Vector2();
  const _event = { type: '', data: _pointer };

  class InteractiveGroup extends Group {

    constructor( renderer, camera ) {

      super();

      if( !renderer || !camera ) return 

      // extract camera when camera-rig is passed
      camera.traverse( (n) =>  String(n.type).match(/Camera/) ? camera = n : null )

      const scope = this;
      scope.objects = []

      const raycaster = new Raycaster();
      const tempMatrix = new Matrix4();

      function nocollide(){
        if( nocollide.tid ) return  // ratelimit
        _event.type = "nocollide"
        scope.objects.map( (c) => c.dispatchEvent(_event) )
        nocollide.tid = setTimeout( () => nocollide.tid = null, 100 )
      }

      // Pointer Events

      const element = renderer.domElement;

      function onPointerEvent( event ) {

        //event.stopPropagation();

        const rect = renderer.domElement.getBoundingClientRect();

        _pointer.x = ( event.clientX - rect.left ) / rect.width * 2 - 1;
        _pointer.y = - ( event.clientY - rect.top ) / rect.height * 2 + 1;

        raycaster.setFromCamera( _pointer, camera );

        const intersects = raycaster.intersectObjects( scope.objects, false );

        if ( intersects.length > 0 ) {

          const intersection = intersects[ 0 ];

          const object = intersection.object;
          const uv = intersection.uv;

          _event.type = event.type;
          _event.data.set( uv.x, 1 - uv.y );

          object.dispatchEvent( _event );

        }else nocollide()

      }

      element.addEventListener( 'pointerdown', onPointerEvent );
      element.addEventListener( 'pointerup', onPointerEvent );
      element.addEventListener( 'pointermove', onPointerEvent );
      element.addEventListener( 'mousedown', onPointerEvent );
      element.addEventListener( 'mouseup', onPointerEvent );
      element.addEventListener( 'mousemove', onPointerEvent );
      element.addEventListener( 'click', onPointerEvent );

      // WebXR Controller Events
      // TODO: Dispatch pointerevents too

      const events = {
        'move': 'mousemove',
        'select': 'click',
        'selectstart': 'mousedown',
        'selectend': 'mouseup'
      };

      function onXRControllerEvent( event ) {

        const controller = event.target;

        tempMatrix.identity().extractRotation( controller.matrixWorld );

        raycaster.ray.origin.setFromMatrixPosition( controller.matrixWorld );
        raycaster.ray.direction.set( 0, 0, - 1 ).applyMatrix4( tempMatrix );

        const intersections = raycaster.intersectObjects( scope.objects, false );

        if ( intersections.length > 0 ) {

          const intersection = intersections[ 0 ];

          const object = intersection.object;
          const uv = intersection.uv;

          _event.type = events[ event.type ];
          _event.data.set( uv.x, 1 - uv.y );

          object.dispatchEvent( _event );

        }else nocollide()

      }

      const controller1 = renderer.xr.getController( 0 );
      controller1.addEventListener( 'move', onXRControllerEvent );
      controller1.addEventListener( 'select', onXRControllerEvent );
      controller1.addEventListener( 'selectstart', onXRControllerEvent );
      controller1.addEventListener( 'selectend', onXRControllerEvent );

      const controller2 = renderer.xr.getController( 1 );
      controller2.addEventListener( 'move', onXRControllerEvent );
      controller2.addEventListener( 'select', onXRControllerEvent );
      controller2.addEventListener( 'selectstart', onXRControllerEvent );
      controller2.addEventListener( 'selectend', onXRControllerEvent );

    }

    add(obj){
      Group.prototype.add.call( this, obj )
      this.objects = ([]).concat( this.children )
    }

  }

  return new InteractiveGroup(renderer,camera)
}