var Editor = function () {

	var SIGNALS = signals;

	this.signals = {

		// actions

		playAnimations: new SIGNALS.Signal(),

		// notifications

		transformModeChanged: new SIGNALS.Signal(),
		snapChanged: new SIGNALS.Signal(),
		rendererChanged: new SIGNALS.Signal(),

		sceneGraphChanged: new SIGNALS.Signal(),

		objectSelected: new SIGNALS.Signal(),
		objectAdded: new SIGNALS.Signal(),
		objectChanged: new SIGNALS.Signal(),
		objectRemoved: new SIGNALS.Signal(),

		helperAdded: new SIGNALS.Signal(),
		helperRemoved: new SIGNALS.Signal(),

		materialChanged: new SIGNALS.Signal(),
		clearColorChanged: new SIGNALS.Signal(),
		fogTypeChanged: new SIGNALS.Signal(),
		fogColorChanged: new SIGNALS.Signal(),
		fogParametersChanged: new SIGNALS.Signal(),
		windowResize: new SIGNALS.Signal()

	};

	this.scene = new THREE.Scene();
	this.sceneHelpers = new THREE.Scene();

	this.object = {};
	this.geometries = {};
	this.materials = {};
	this.textures = {};

	this.selected = null;
	this.helpers = {};

};

Editor.prototype = {

	setScene: function ( scene ) {

		this.scene.name = scene.name;
		this.scene.userData = JSON.parse( JSON.stringify( scene.userData ) );

		while ( scene.children.length > 0 ) {

			this.addObject( scene.children[ 0 ] );

		}

	},

	//

	addObject: function ( object ) {

		var scope = this;

		object.traverse( function ( child ) {

			scope.addHelper( child );

		} );

		this.scene.add( object );

		this.signals.objectAdded.dispatch( object );
		this.signals.sceneGraphChanged.dispatch();

	},

	removeObject: function ( object ) {

		if ( object.parent === undefined ) return; // avoid deleting the camera or scene

		if ( confirm( 'Delete ' + object.name + '?' ) === false ) return;

		var scope = this;

		object.traverse( function ( child ) {

			scope.removeHelper( child );

		} );

		object.parent.remove( object );

		this.signals.objectRemoved.dispatch( object );
		this.signals.sceneGraphChanged.dispatch();

	},

	addGeometry: function ( geometry  ) {

	},

	removeGeometry: function ( geometry  ) {

	},

	addMaterial: function ( material ) {

	},

	removeMaterial: function ( material ) {

	},

	addTexture: function ( texture ) {

	},

	removeTexture: function ( texture ) {

	},

	//

	addHelper: function () {

		var geometry = new THREE.SphereGeometry( 20, 4, 2 );
		var material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );

		return function ( object ) {

			if ( object instanceof THREE.Camera ) {

				var picker = new THREE.Mesh( geometry, material );
				picker.name = 'picker';
				picker.userData.object = object;
				picker.visible = false;

				var helper = new THREE.CameraHelper( object, 10 );
				helper.add( picker );
			
				this.sceneHelpers.add( helper );
				this.helpers[ object.id ] = helper;

				this.signals.helperAdded.dispatch( helper );

			} else if ( object instanceof THREE.PointLight ) {

				var picker = new THREE.Mesh( geometry, material );
				picker.name = 'picker';
				picker.userData.object = object;
				picker.visible = false;

				var helper = new THREE.PointLightHelper( object, 10 );
				helper.add( picker );
			
				this.sceneHelpers.add( helper );
				this.helpers[ object.id ] = helper;

				this.signals.helperAdded.dispatch( helper );

			} else if ( object instanceof THREE.DirectionalLight ) {

				var picker = new THREE.Mesh( geometry, material );
				picker.name = 'picker';
				picker.userData.object = object;
				picker.visible = false;

				var helper = new THREE.DirectionalLightHelper( object, 20 );
				helper.add( picker );

				this.sceneHelpers.add( helper );
				this.helpers[ object.id ] = helper;

				this.signals.helperAdded.dispatch( helper );

			} else if ( object instanceof THREE.SpotLight ) {

				var picker = new THREE.Mesh( geometry, material );
				picker.name = 'picker';
				picker.userData.object = object;
				picker.visible = false;

				var helper = new THREE.SpotLightHelper( object, 10 );
				helper.add( picker );

				this.sceneHelpers.add( helper );
				this.helpers[ object.id ] = helper;

				this.signals.helperAdded.dispatch( helper );

			} else if ( object instanceof THREE.HemisphereLight ) {

				var picker = new THREE.Mesh( geometry, material );
				picker.name = 'picker';
				picker.userData.object = object;
				picker.visible = false;

				var helper = new THREE.HemisphereLightHelper( object, 10 );
				helper.add( picker );

				this.sceneHelpers.add( helper );
				this.helpers[ object.id ] = helper;

				this.signals.helperAdded.dispatch( helper );

			}

		};

	}(),

	removeHelper: function ( object ) {

		if ( this.helpers[ object.id ] !== undefined ) {

			var helper = this.helpers[ object.id ];
			helper.parent.remove( helper );

			delete this.helpers[ object.id ];

			this.signals.helperRemoved.dispatch( helper );

		}

	},

	//

	parent: function ( object, parent ) {

		if ( parent === undefined ) {

			parent = this.scene;

		}

		parent.add( object );

		this.signals.sceneGraphChanged.dispatch();

	},

	//

	select: function ( object ) {

		this.selected = object;
		this.signals.objectSelected.dispatch( object );

	},

	selectById: function ( id ) {

		this.select( this.scene.getObjectById( id, true ) );

	},

	deselect: function () {

		this.select( null );

	}

}