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

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

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

	var guis = GameLib.EntityManager.Instance.queryComponents(GameLib.GUI);

	guis.map(function(gui){
		gui.domElement.instance.parentElement.appendChild(gui.instance.domElement);
	})
};

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

	var guis = GameLib.EntityManager.Instance.queryComponents(GameLib.GUI);

	guis.map(function(gui){
		gui.domElement.instance.parentElement.removeChild(gui.instance.domElement);
	})
};