(function() {
    var messageChannel = 'MESSAGE_CHANNEL_GATE_GAME';
    var SOUND_URL = 'https://hifi-content.s3.amazonaws.com/wadewatts/Ring2.wav?v=' + Date.now();
    var entityID;
    var sound;

    function sendMessage(message) {
        message.entityID = entityID;
        Messages.sendMessage(
            messageChannel,
            JSON.stringify(message)
        );
    }

    function onReceivedMessage(channel, message, senderID) {
        try {
            var data = JSON.parse(message);
        } catch (e) {
            print('Error parsing message: ' + message);
            return;
        }
        print('data: ' + JSON.stringify(data));

        switch (data.type) {
            case 'CHECKPOINT':
                if (entityID === data.gateID) {
                    var position = Entities.getEntityProperties(entityID, 'position').position;
                    var audioProperties = {
                        volume: 0.1,
                        position: position
                    };
                    Audio.playSound(sound, audioProperties);
                }
                break;
        }
    }



    return {
        preload: function(id) {
            entityID = id;
            Messages.subscribe(messageChannel);
            Messages.messageReceived.connect(null, onReceivedMessage);
            sound = SoundCache.getSound(SOUND_URL);
            sendMessage({
                type: 'INIT_GATE',
                gateID: entityID
            });
            print('Hello Gate');
        },
        unload: function(id) {
            sendMessage({
                type: 'REMOVE_GATE',
                gateID: entityID
            });
            Messages.unsubscribe(messageChannel);
            Messages.messageReceived.disconnect(null, onReceivedMessage);
        },
        enterEntity: function(id) {
            sendMessage({
                type: 'PASS_THROUGH_GATE',
                avatarSessionUUID: MyAvatar.sessionUUID,
                avatarDisplayName: MyAvatar.displayName,
                gateID: entityID
            });
        }
    };
})