/**
 * System takes care of updating all the entities (based on their component data)
 * @param apiSystem GameLib.API.System
 * @constructor
 */
GameLib.System.Input = function(
    apiSystem
) {
	GameLib.System.call(
        this,
        apiSystem
    );
};

GameLib.System.Input.prototype = Object.create(GameLib.System.prototype);
GameLib.System.Input.prototype.constructor = GameLib.System.Input;

GameLib.System.Input.prototype.start = function() {

	/**
	 * Hookup all editor input capabilities
	 */
	var entities = GameLib.EntityManager.Instance.query([GameLib.D3.Input.Editor]);

	entities.map(function(entity){

		var component = entity.getFirstComponent(GameLib.D3.Input.Editor);

		component.mouseDown		= component.onMouseDown(entity, GameLib.EntityManager.Instance).bind(component);
		component.mouseMove		= component.onMouseMove(entity).bind(component);
		component.keyDown		= component.onKeyDown(entity, GameLib.EntityManager.Instance).bind(component);
		component.keyUp			= component.onKeyUp(entity, GameLib.EntityManager.Instance).bind(component);

		component.domElement.instance.addEventListener('mousedown', component.mouseDown, false);
		component.domElement.instance.addEventListener('mousemove', component.mouseMove, false);
		component.domElement.instance.addEventListener('keydown',   component.keyDown, false);
		component.domElement.instance.addEventListener('keyup',     component.keyUp, false);

		component.controls = new THREE.EditorControls(
			component.camera.instance,
			component.domElement.instance
		);

		/**
		 * After our mouse 'up' editor controls would have updated our camera
		 * instance, so we need to update our game-lib camera to reflect these
		 * changes - we override
		 */
		component.mouseUp = function(center) {
			return function() {
				var camera = entity.getFirstComponent(GameLib.D3.Camera);
				camera.position.x = camera.instance.position.x;
				camera.position.y = camera.instance.position.y;
				camera.position.z = camera.instance.position.z;

				camera.quaternion.x = camera.instance.quaternion.x;
				camera.quaternion.y = camera.instance.quaternion.y;
				camera.quaternion.z = camera.instance.quaternion.z;
				camera.quaternion.w = camera.instance.quaternion.w;

				camera.lookAt.x = center.x;
				camera.lookAt.y = center.y;
				camera.lookAt.z = center.z;

				camera.lookAt.instance.copy(center);
			};
		}(component.controls.center).bind(component);

		/**
		 * Same applies to our mouse 'scroll' event
		 */
		component.mouseWheel = function() {
			return function() {
				var camera = entity.getFirstComponent(GameLib.D3.Camera);
				camera.position.x = camera.instance.position.x;
				camera.position.y = camera.instance.position.y;
				camera.position.z = camera.instance.position.z;
			};
		}.bind(component);

		component.domElement.instance.addEventListener('mousewheel', component.mouseWheel, false);
		component.domElement.instance.addEventListener('mouseup',    component.mouseUp, false);

	}.bind(this))

};

GameLib.System.Input.prototype.stop = function() {

	/**
	 * Now remove all editor input capabilities
	 */
	var entities = GameLib.EntityManager.Instance.query([GameLib.D3.Input.Editor]);

	entities.map(function(entity){
		var component = entity.getFirstComponent(GameLib.D3.Input.Editor);
		component.domElement.instance.removeEventListener('mousedown', component.mouseDown, false);
		component.domElement.instance.removeEventListener('mousemove', component.mouseMove, false);
		component.domElement.instance.removeEventListener('keydown', component.keyDown, false);
		component.domElement.instance.removeEventListener('keyup', component.keyUp, false);
		component.controls.dispose();
		component.domElement.instance.removeEventListener('mouseup', component.mouseUp, false);
		component.domElement.instance.removeEventListener('mousewheel', component.mouseWheel, false);
	});

};