/**
 * R3.System.AR
 * @param apiSystem R3.API.System
 * @constructor
 */
R3.System.AR = function(
    apiSystem
) {
	R3.System.call(
        this,
        apiSystem
    );

    this.instanceCreatedSubscription = null;

    this.removeComponentSubscription = null;

    this.beforeRenderSubscription = null;

    this.arComponents = [];

};

R3.System.AR.prototype = Object.create(R3.System.prototype);
R3.System.AR.prototype.constructor = R3.System.AR;

/**
 * Start this system (add all event listeners)
 */
R3.System.AR.prototype.start = function() {

    R3.System.prototype.start.call(this);

    this.instanceCreatedSubscription = this.subscribe(
        R3.Event.INSTANCE_CREATED,
        this.instanceCreated
    );

    this.removeComponentSubscription = this.subscribe(
        R3.Event.REMOVE_COMPONENT,
        this.removeComponent
    );

    this.beforeRenderSubscription = this.subscribe(
        R3.Event.BEFORE_RENDER,
        this.beforeRender
    );

};

/**
 * From now on we want to track everything about a component, only from the systems that are active
 * @param data
 */
R3.System.AR.prototype.instanceCreated = function(data) {
    if (data.component instanceof R3.D3.AR) {
        R3.Utils.PushUnique(this.arComponents, data.component);
    }
};

/**
 * Removes an AR component from the System
 * @param data
 */
R3.System.AR.prototype.removeComponent = function(data) {

    if (data.component instanceof R3.D3.AR) {

        var index = this.arComponents.indexOf(data.component);

        if (index === -1) {
            console.warn('AR system out of sync');
            return;
        }

        this.arComponents.splice(index, 1);
    }
};

R3.System.AR.prototype.beforeRender = function(data) {
    console.log('AR Render');
};


/**
 * Stop this system (remove all event listeners)
 */
R3.System.AR.prototype.stop = function() {

    R3.System.prototype.stop.call(this);

    this.instanceCreatedSubscription.remove();
    this.removeComponentSubscription.remove();
    this.beforeRenderSubscription.remove();

};