(function() {
    
   var lightID;
   var colors = [{red: 255, green: 255, blue: 255 }, 
                 {red: 0, green: 255, blue: 0 },
                 { red: 0, green: 0, blue: 255 }];

    var loop;

    var isAttack = false;

    var alienListener = function(channel, message, sender){
        message = JSON.parse(message);
        if (channel == "InvasionChannel" && message.type == 'before_it_all_happens') {
            Script.clearInterval(loop);
            Entities.editEntity(lightID, {'color' : {red: 255, green: 0, blue: 0}});
            isAttack = true;
        } else if (channel == "InvasionChannel" && message.type == 'gameover') {
            isAttack = false;
            Script.setInterval(lightEffect, 10000);
        }
    }

    var lightEffect = function(){
        var color = Math.round(Math.random()*3); // one of three random colors
        if (!isAttack){
            Entities.editEntity(lightID, {'color' : colors[color]});            
        }
    }

    var HatEffect = function(){

    };

    HatEffect.prototype = {
        preload: function(entityID){
            lightID = Entities.getChildrenIDs(entityID)[0]; //we only have one child, the light
            Messages.subscribe("InvasionChannel");
            Messages.messageReceived.connect(alienListener);
            loop = Script.setInterval(lightEffect, 10000);
        },
        unload: function(){
            Messages.messageReceived.disconnect(alienListener);
            Script.clearInterval(loop);
        }
    };
    return new HatEffect();
});