(function() {
    var messageChannel = 'MESSAGE_CHANNEL_GATE_GAME';
    var entityID;
    var racers;

    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 'PASS':
                var racer = racers[data.avatarSessionUUID];
                if (!racer) {
                    racers[data.avatarSessionUUID] = racer = {};
                    racer.avatarDisplayName = data.avatarDisplayName;
                }

                if (!racer.startTime) {
                    racer.startTime = Date.now();
                    racer.time = 'racing...';
                } else {
                    racer.time = ((Date.now() - racer.startTime) / 1000).toFixed(3) + ' sec';
                    racer.startTime = null;
                }
                renderScoreboard();
                break;
        }
    }

    function renderScoreboard() {
        var text = '';
        for (var sessionUUID in racers) {
            var racer = racers[sessionUUID];
            text += racer.avatarDisplayName + ' ' + racer.time + '\n';
        }
        Entities.editEntity(entityID, {
            text: text
        });
    }


    return {
        preload: function(id) {
            entityID = id;
            racers = {};
            Messages.subscribe(messageChannel);
            Messages.messageReceived.connect(null, onReceivedMessage);
            print('Hello Scoreboard');
            Entities.editEntity(entityID, {
                text: 'Hello Scoreboard'
            });
        },
        unload: function(id) {
            Messages.unsubscribe(messageChannel);
            Messages.messageReceived.disconnect(null, onReceivedMessage);
        },
    };
})