(function() {
    var messageChannel = 'MESSAGE_CHANNEL_GATE_GAME';
    var SOUND_URL = 'https://hifi-content.s3.amazonaws.com/wadewatts/coin%20noise.wav?v=' + Date.now();
    var gateID;
    var sound;

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

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

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

    function getUserData() {
        var userData = Entities.getEntityProperties(gateID, 'userData').userData;
        try {
            userData = JSON.parse(userData);
        } catch (e) {
            print('[gate.js] Error parsing userData');
        }
        return userData;
    }

    return {
        preload: function(id) {
            gateID = id;
            var userData = getUserData();
            sound = SoundCache.getSound(userData.soundUrl || SOUND_URL);

            sendMessage({
                type: 'INIT_GATE'
            });
        },

        unload: function(id) {
            sendMessage({
                type: 'REMOVE_GATE'
            });
        },

        enterEntity: function(id) {
            var position = Entities.getEntityProperties(gateID, 'position').position;
            var userData = getUserData();
            var audioProperties = {
                volume: (userData.volume || 1),
                position: position
            };
            Audio.playSound(sound, audioProperties);

            sendMessage({
                type: 'CHECKPOINT',
                racerID: MyAvatar.sessionUUID,
                racerName: MyAvatar.displayName
            });
        }
    };
})