(function() {
    var messageChannel = 'MESSAGE_CHANNEL_GATE_GAME';
    var entityID;
    var gates;
    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('[scoreboard_server] Error parsing message: ' + message);
            return;
        }

        switch (data.type) {
            case 'INIT_GATE':
                addGate(data.gateID);
                print(JSON.stringify(gates));
                break;

            case 'REMOVE_GATE':
                removeGate(data.gateID);
                break;

            case 'CHECKPOINT':
                addRacer(data.racerID, data.racerName);
                completeCheckpoint(data.racerID, data.gateID);
                print(JSON.stringify(racers));
                break;
        }
    }

    function completeCheckpoint(racerID, gateID) {
        var racer = racers[racerID];
        var completedGates = racer.completedGates;
        var isCompleted = (completedGates.indexOf(gateID) > -1);
        if (!isCompleted) {
            completedGates.push(gateID);
            if (completedGates.length === 1) {
                racer.isRacing = true;
                racer.startTime = Date.now();
                sendRenderMessage();
            }
            else if (completedGates.length === gates.length) {
                racer.isRacing = false;
                racer.finishTime = ((Date.now() - racer.startTime) / 1000);
                if (racer.bestTime === -1 || racer.finishTime < racer.bestTime) {
                    racer.bestTime = racer.finishTime;
                }
                racer.completedGates = [];
                sendRenderMessage();
            }
            else if (completedGates.length > gates.length) {
                print('More completed gates than gates exist! A gate was probably deleted.');
                racer.isRacing = false;
                racer.finishTime = ((Date.now() - racer.startTime) / 1000);
                if (racer.bestTime === -1 || racer.finishTime < racer.bestTime) {
                    racer.bestTime = racer.finishTime;
                }
                racer.completedGates = [];
                sendRenderMessage();
            }
        }
    }

    function addRacer(racerID, racerName) {
        if (!racers[racerID]) {
            racers[racerID] = {
                name: racerName,
                completedGates: [],
                startTime: -1,
                finishTime: -1,
                bestTime: -1,
                isRacing: false
            }
        }
    }

    function addGate(gateID) {
        var isGateAdded = (gates.indexOf(gateID) > -1);
        if (!isGateAdded) {
            gates.push(gateID);
        }
    }

    function removeGate(gateID) {
        var gateIndex = gates.indexOf(gateID);
        if (gateIndex > -1) {
            gates.splice(gateIndex, 1);
        }
    }

    function sendRenderMessage() {
        sendMessage({
            type: 'RENDER',
            racers: racers
        });
    }




    return {
        preload: function(id) {
            entityID = id;
            gates = [];
            racers = {};
            Messages.subscribe(messageChannel);
            Messages.messageReceived.connect(null, onReceivedMessage);
            print('THERE HAD BETTER BE SOME CHANGES AROUND HERE');
        },
        unload: function(id) {
            Messages.unsubscribe(messageChannel);
            Messages.messageReceived.disconnect(null, onReceivedMessage);
        },
    };
})