(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('Error parsing message: ' + message);
            return;
        }
        // print('data: ' + JSON.stringify(data));

        switch (data.type) {
            case 'INIT_GATE':
                gates.push(data.gateID);
                updateRacerGates();
                break;

            case 'REMOVE_GATE':
                var gateIndex = gates.indexOf(data.gateID);
                if (gateIndex > -1) {
                    gates.splice(gateIndex, 1);
                }
            updateRacerGates();
                break;
            
          case 'ADD_RACER':
            var racer = racers[data.avatarSessionUUID] = {
              sessionUUID: data.avatarSessionUUID,
              displayName: data.avatarDisplayName,
              isRacing: false,
              startTime: null,
              finishTime: null,
              bestTime: null,
              gates: {}
            };
            updateRacerGates();
              break;

            case 'REMOVE_RACER':
                if (racers[data.avatarSessionUUID]) {
                    delete racers[data.avatarSessionUUID];
                    sendRenderMessage();
                }
                break;

            case 'PASS_THROUGH_GATE':
                var racer = racers[data.avatarSessionUUID];
                var allGatesPassed = racer.gates.every(function(gateCompleted) {
                  return gateCompleted;
                });
                if (allGatesPassed) {
                  if (racer.isRacing) { // finish race
                    racer.isRacing = false;
                    racer.finishTime = Date.now() - racer.startTime;
                    racer.bestTime = racer.finishTime < racer.bestTime ? racer.finishTime : racer.bestTime;
                  }
                  else { // start race
                    racer.isRacing = true;
                    racer.startTime = Date.now();
                    for (var i = 0; i < gates.length; i++) {
                      var gateID = gates[i];
                      racer.gates[gateID] = false;
                    }
                  }
                }
                racer.gates[data.gateID] = true;
                print(racer.displayName + ' passed gates: ' + racer.gates);
                sendRenderMessage();
            
//                 print('RACERS ' + JSON.stringify(racers));
//                 print('GATES ' + gates.length + ' ' + JSON.stringify(gates));
                
//                 var racer = racers[data.avatarSessionUUID];
//                 if (!racer) {
//                     racers[data.avatarSessionUUID] = racer = {
//                         avatarDisplayName: data.avatarDisplayName || 'Anon',
//                         isRacing: false
//                     };
//                 }

//                 if (!racer.isRacing && data.gateID === gates[0]) {
//                     racer.isRacing = true;
//                     racer.startTime = Date.now();
//                     racer.gatesPassed = 1;
//                     racer.time = 'racing...';
//                 } else if (racer.gatesPassed < gates.length && gates[racer.gatesPassed] === data.gateID) {
//                     racer.gatesPassed++;
//                     sendMessage({
//                         type: 'CHECKPOINT',
//                         gateID: data.gateID
//                     });
//                 } else if (racer.gatesPassed === gates.length && gates[0] === data.gateID) { // finish race by going into the starting ring again
//                     racer.isRacing = false;
//                     racer.time = ((Date.now() - racer.startTime) / 1000).toFixed(3) + ' sec';
//                     if (!racer.bestTime || racer.time < racer.bestTime) {
//                         racer.bestTime = racer.time;
//                     }
//                     sendMessage({
//                         type: 'CHECKPOINT',
//                         gateID: data.gateID
//                     });
//                 } else {
//                   return;
//                 }
//                 sendRenderMessage();
                break;
        }
    }

    function sendRenderMessage() {
        sendMessage({
            type: 'RENDER',
            racers: racers
        });
    }
  
  function updateRacerGates() {
    Object.keys(racers).forEach(function(racerID) {
      print('RACERID ' + racerID);
      var racer = racers[racerID];
      racer.gates = {};
      gates.forEach(function(gateID) {
        racer.gates[gateID] = true;
      });
    });
  }


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