( function () {

	const _pointer = new THREE.Vector2();

	const _event = {
		type: '',
		data: _pointer
	};

	class InteractiveGroup extends THREE.Group {

		constructor( renderer, camera ) {

			super();
			const scope = this;
			const raycaster = new THREE.Raycaster();
			const tempMatrix = new THREE.Matrix4(); // Pointer Events

			const element = renderer.domElement;

			function onPointerEvent( event ) {

				event.stopPropagation();
				_pointer.x = event.clientX / element.clientWidth * 2 - 1;
				_pointer.y = - ( event.clientY / element.clientHeight ) * 2 + 1;
				raycaster.setFromCamera( _pointer, camera );
				const intersects = raycaster.intersectObjects( scope.children );

				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 );

				}

			}

			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.children );

				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 );

				}

			}

			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 );

		}

	}

	THREE.InteractiveGroup = InteractiveGroup;

} )();
