(function(){
    var self = this;

    this.preload = function(entityId) {
        this.entityId = entityId;
        this.yChange = 0.05;
        this.changeCount = 0;
        this.yaw = 0;
        print("preload entityId:" + entityId);
    }
    
    this.unload = function() {
        print("unload");
        Script.update.disconnect(this.update);
    }

    this.update = function(deltaTime) {
        //print("update");
        
        var properties = Entities.getEntityProperties(self.entityId);
        
        var newPosition = properties.position;
        newPosition.y = newPosition.y + self.yChange;
        
        self.yaw = self.yaw + 5;
        if (self.yaw > 360) {
            self.yaw = 0;
        }

        Entities.editEntity(self.entityId, { 
            position: newPosition,
            rotation: Quat.fromPitchYawRollDegrees(self.yaw, self.yaw, self.yaw)
        });

        self.changeCount++;
        
        if (self.changeCount > 10) {
            self.changeCount = 0;
            self.yChange = self.yChange * -1;
        }
    }

    Script.update.connect(this.update);
});