/**
 * 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
    );

    this.guis = [];

    this.buildGUISubscription = null;

    this.meshDeletedSubscription = null;

    this.meshSelectedSubscription = null;

    this.meshDeselectedSubscription = null;

    this.newEntitySubscription = null;

    this.meshSelectionObjects = {};
    
};

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

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

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

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

    this.buildGUISubscription = this.subscribe(
        GameLib.Event.BUILD_GUI,
        this.buildGUI
    );

    this.meshDeletedSubscription = this.subscribe(
        GameLib.Event.MESH_DELETED,
        this.meshDeleted
    );

    this.meshSelectedSubscription = this.subscribe(
        GameLib.Event.MESH_SELECTED,
        this.meshSelected
    );

    this.meshDeselectedSubscription = this.subscribe(
        GameLib.Event.MESH_DESELECTED,
        this.meshDeslected
    );

    this.newEntitySubscription = this.subscribe(
        GameLib.Event.NEW_ENTITY,
        this.newEntity
    )
};

GameLib.System.GUI.prototype.buildGUI = function(data) {



    this.guis.map(function(gui){
        gui.objects = [];

        if (
            data.components &&
            data.components.length > 0
        ) {
            gui.objects = data.components;
        }

        gui.build(GameLib.EntityManager.Instance);
    });

};

GameLib.System.GUI.prototype.meshDeleted = function(data) {

};

GameLib.System.GUI.prototype.meshSelected = function(data) {

    var mesh = data.mesh;
    
    var objectsToAdd = [];
    
    this.guis.map(
        function(gui) {
            if (mesh.parentEntity) {
                GameLib.Utils.PushUnique(objectsToAdd, mesh.parentEntity);
            }
            objectsToAdd.push(mesh);
            mesh.materials.map(
                function(material){
                    GameLib.Utils.PushUnique(objectsToAdd, material);
                }
            );
            mesh.materials.map(
                function(material){
                    for (var property in material.linkedObjects) {
                        if (
                            material.linkedObjects.hasOwnProperty(property) &&
                            material.hasOwnProperty(property) &&
                            material[property] &&
                            property !== 'parentEntity'
                        )
                        {
                            GameLib.Utils.PushUnique(objectsToAdd, material[property]);
                            for (var tProperty in material[property].linkedObjects) {
                                if (
                                    material[property].linkedObjects.hasOwnProperty(tProperty) &&
                                    material[property].hasOwnProperty(tProperty) &&
                                    material[property][tProperty] &&
                                    tProperty !== 'parentEntity'
                                ) {
                                    GameLib.Utils.PushUnique(objectsToAdd, material[property][tProperty]);
                                }
                            }
                        }
                    }
                }
            )
        }
    );

    this.guis.map(function(gui){
        objectsToAdd.map(function(object){
            gui.addObject(object);
        }.bind(this));

        gui.build(GameLib.EntityManager.Instance);
    });

    this.meshSelectionObjects[mesh.id] = objectsToAdd;
};

GameLib.System.GUI.prototype.meshDeslected = function(data) {

    if (GameLib.Utils.UndefinedOrNull(this.meshSelectionObjects[data.mesh.id])) {
        console.warn('selected mesh data not available');
        return;
    }

    this.guis.map(
        function(gui) {
            this.meshSelectionObjects[data.mesh.id].map(function(object){
                gui.removeObject(object);
            }.bind(this));

            gui.build(GameLib.EntityManager.Instance);
        }.bind(this)
    )

};

GameLib.System.GUI.prototype.newEntity = function(data) {

};

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

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

    this.buildGUISubscription.remove();

    this.meshDeletedSubscription.remove();

    this.meshSelectedSubscription.remove();

    this.meshDeselectedSubscription.remove();

    this.newEntitySubscription.remove();

    this.guis = [];
};