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

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

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

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

    this.renderSubscriptions = [];

    this.animateSubscription = GameLib.Event.Subscribe(
        GameLib.Event.ANIMATE,
        this.animate.bind(this)
    );


};

GameLib.System.Animation.prototype.animate = function(animationData, clientCallback) {

    this.renderSubscriptions.push(

        new GameLib.Event.Subscribe(

            GameLib.Event.BEFORE_RENDER,

            function(subscriptionIndex) {
                return function(renderData) {

                    if (
                        clientCallback(
                            {
                                renderData : renderData,
                                animationData : animationData
                            }
                        )
                    ) {

                        this.renderSubscriptions[subscriptionIndex].remove();

                        animationData.done();
                    }

                }.bind(this);

            }.bind(this)(this.renderSubscriptions.length)
        )
    );


};

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

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

    this.animateSubscription.remove();
};