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HTML

              
                <script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0-rc.1/angular.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0-rc.1/angular-animate.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0-rc.1/angular-aria.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0-rc.1/angular-sanitize.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular-material/1.0.2/angular-material.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular-material-icons/0.6.0/angular-material-icons.min.js"></script>
<script src="//cdn.firebase.com/js/client/2.3.2/firebase.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angularFire/1.1.3/angularfire.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/gsap/1.18.2/TweenMax.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/gsap/1.18.2/utils/Draggable.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/4.0.0/lodash.min.js"></script>

<body ng-app="magnetGame" ng-cloak>

  <md-toolbar class="md-whiteframe-1dp">
    <div class="md-toolbar-tools">
      <h2>
        <span>Real-time Fridge Magnets</span>
      </h2>
      <span flex></span>      
      <div class="viewers" layout="row">
        <md-tooltip md-direction="bottom">
          Users Online
        </md-tooltip>
<!--         <div layout-align="center center" layout="column">
          {{viewers || 0}} 
        </div>
        <div layout-align="center center" layout="column">
          <ng-md-icon icon="people" style="fill: white" size="24"></ng-md-icon> 
        </div>        -->
      </div>      
    </div>   
  </md-toolbar>

  <md-content class="connecting-content md-whiteframe-2dp" ng-if="!(loggedIn && loaded)" layout-padding layout-margin>
    <h1 class="md-title">Connecting...</h1>
  </md-content>

  <section ng-controller="MainController as vm" ng-if="loggedIn && loaded" layout="column" layout-margin>
    
    <md-content class="info-content md-whiteframe-2dp" layout="column" layout-padding>
            
      <div>
        <ul class="instructions">
          <li>View this page in another browser window :)</li>
          <li>Moves are synced across all connected clients</li>
          <li>Drag a magnet off the board to remove</li>
        </ul>
      </div>
      
      <div>
        <form ng-submit="vm.addWords()">
          <md-input-container md-no-float>
            <input ng-model="vm.magnet" maxlength="25" placeholder="Add magnets...">
          </md-input-container>
        </form>
      </div>
            
    </md-content>
    
    <section class="board md-whiteframe-2dp">      
        <gs-magnet class="magnet-animation" 
                   ng-repeat="magnet in vm.magnets track by magnet.id" 
                   ng-class="{locked: magnet.locked}" 
                   magnet-id="{{magnet.id}}" 
                   update-draggable="vm.updateDraggable()"
                   update-board="vm.updateBoard()">
        </gs-magnet>
    </section>    
  </section>
</body>
              
            
!

CSS

              
                md-input-container {
  margin: 0;
}

md-input-container .md-errors-spacer {
  min-height: 0 !important;
  height: 0 !important;
}

gs-magnet {
  padding: 6px 10px;
  position: absolute;
  display: block;
  border-radius: 3px;
  background: rgb(250,250,250);
  color: rgb(33,33,33);
  box-shadow: 0 2px 5px 0 rgba(0,0,0,0.26);
}

.board {
  width: 800px;
  height: 500px;
  position: relative;
  display: block;
  border: 1px solid rgba(0,0,0,0.12);
}

.instructions {
  margin: 0;
  padding: 0 1em;
  font-size: 15px;
  color: rgba(0,0,0,0.54); 
}

.instructions li {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .010em;
  margin: 0;
  line-height: 1.6em;
}

.info-content,
.connecting-content {
  width: 800px;
}

.viewers {
  font-size: 16px;
  font-weight: 400;
}

.viewers ng-md-icon {
  margin-left: 8px;
}
              
            
!

JS

              
                console.clear();
var log = console.log.bind(console);


namespace MagnetGame {
  
  "use strict";
      
  const firebaseApp = "magnet-game-1";
  
  //
  // START FIREBASE
  // ========================================================================
  function startFirebase($rootScope, firebaseData, Viewers) {
    
    $rootScope.authData = null;
    $rootScope.error    = null;
    $rootScope.loaded   = false;
    $rootScope.loggedIn = false;
        
    firebaseData.auth.$onAuth(authData => {
      $rootScope.authData = authData;
      $rootScope.loggedIn = !!authData;
    });
    
    firebaseData.auth.$authAnonymously();    
    firebaseData.magnetsRef.once("value", () => $rootScope.loaded = true);
  }
  
  //
  // MAIN CONTROLLER
  // ========================================================================
  class MainController {
    
    magnet     = "";
    magnets    = [];
    addWords   = _.throttle(this.addMagnet.bind(this), 1000);
    magnetsRef = this.firebaseData.magnetsRef;
         
    words = [
      "how are you doing",
      "where are you from",
      "tell me a joke"
    ];
  
    // TODO: Create a magnet service
    constructor(
      private $rootScope,
      private $sanitize, 
      private $timeout, 
      private firebaseData) {
      
      this.magnetsRef.on("value", this.onChange.bind(this));
      
      this.updateBoard();
    }
  
    onChange(snapshot) {
      
      this.magnets = _.reduce(snapshot.val(), (result, value, key) => {
        result.push(_.assign({}, { id: key }, value));
        return result;
      }, []);
      
      this.$timeout();
    }
  
    addMagnet() {
      
      if (!this.magnet || !_.isString(this.magnet)) return;
              
        this.updateDraggable();
        
        var string = this.$sanitize(this.magnet);
        var words  = _.uniq(_.words(string));
        
        words.forEach((word, i) => {
        
        this.$timeout(() => {

          this.magnetsRef.ref().push({
            x: _.random(50, 600, true),
            y: _.random(50, 400, true),
            rotation: _.random(-8, 8, true),
            zIndex : Draggable.zIndex++,
            locked : false,
            content: _.escapeRegExp(_.escape(word)),
            user: this.$rootScope.authData.uid,
            date: Date.now(),
            // created: Firebase.ServerValue.TIMESTAMP,
          }, error => {
            if (error) console.log(error);
          });

        }, (i + 1) * 50);       
        
        this.magnet = "";
      });
    }
   
    updateBoard() {
            
      if (!this.magnets.length) {
        this.magnet = _.sample(this.words);
        this.addMagnet();
      }
    }
  
    updateDraggable() {
      
      Draggable.zIndex = 1000;

      this.magnets.forEach(magnet => {
        var zIndex = magnet.zIndex * 1;
        if (zIndex >= Draggable.zIndex) Draggable.zIndex = zIndex + 1;
      });
    }
  }

  //
  // VIEWERS
  // ========================================================================
  class Viewers {
    
    connectedRef = firebaseData.connectedRef;
    viewersRef   = firebaseData.viewersRef;
       
    constructor(private $rootScope, private firebaseData) {
            
      this.viewersRef.once("value", snapshot => {
        _.forOwn(snapshot.val(), timestamp => {
          console.info("VIEWER:", new Date(timestamp));
        });
      });
      
      this.connectedRef.on("value", this.onConnection.bind(this));
      this.viewersRef.on("value", this.onViewersChange.bind(this));
    }

    onConnection(snapshot) {
      if (snapshot.val() === true) {
        var viewerRef = this.viewersRef.push(Firebase.ServerValue.TIMESTAMP);
        viewerRef.onDisconnect().remove();
      }
    }

    onViewersChange(snapshot) {
      this.$rootScope.$apply(() => {
        this.$rootScope.viewers = snapshot.numChildren();
      });
    }
  }
  
  //
  // MAGNET CONTROLLER
  // ========================================================================
  class MagnetController {
    
    active  = false;
    time    = 0;
    board   = document.querySelector(".board");
    data    = this.firebaseData.magnet(this.magnetId);      
    unwatch = this.data.$watch(this.onChange.bind(this));

    draggable = null;

    constructor(
      private $element, 
      private $scope, 
      private $timeout, 
      private firebaseData) {
                       
      this.data.$loaded(event => {
        
        if (!this.data.content || !this.data.zIndex) {
          TweenLite.set($element, { autoAlpha: 0 });
          this.remove();
          return;
        }
        
        this.init();
      });
      
      this.data.$ref().onDisconnect().update({ locked: false });
    }

    init() {
      
      this.draggable = new Draggable(this.$element, {
        onDrag: this.onDrag,
        onPress: this.onPress,
        onRelease: this.onRelease,
        zIndexBoost: false,
        callbackScope: this,
        liveSnap: {
          x: n => this.active ? n : this.data.x,
          y: n => this.active ? n : this.data.y
        }      
      });
    }

    onChange(event) {
           
      var config = {
        rotation : this.data.rotation,
        zIndex   : this.data.zIndex || Draggable.zIndex
      };

      if (!this.active) {
        config.x = this.data.x;
        config.y = this.data.y;
      }
      
      TweenLite.to(this.$element, this.time, config);
      
      this.time = 0.07;
    }

    onPress(event) {
      
      if (this.data.locked) return;
      
      this.draggable.update();      
      this.updateDraggable();
      this.active = true;
      this.data.locked = true;
      this.data.zIndex = Draggable.zIndex++;
      this.data.$save(); 
    }

    onRelease(event) {
            
      if (!this.draggable.hitTest(this.board)) {
        this.remove();
        return;
      }
      
      if (!this.active) return;
            
      this.active = false;
      this.data.locked = false;
      this.data.$save(); 
    }

    onDrag(event) {
      
      if (!this.active) return;
      
      this.data.x = this.draggable.x;
      this.data.y = this.draggable.y;
      this.data.$save();
    }

    remove() {
      
      this.draggable && this.draggable.kill();
      this.unwatch();
      this.data.$remove().then(ref => {        
        this.$scope.$destroy();
        this.updateBoard();
      }, error => {
        console.log(error);
      });
    }
  }
    
  //
  // MAGNET COMPONENT
  // ========================================================================
  var magnetComponent = {
    template: `<div class="magnet-inner" ng-bind-html="$ctrl.data.content"></div>`,
    controller: MagnetController,
    bindings: {
      updateDraggable: "&",
      updateBoard: "&",
      magnetId: "@"
    }  
  };
  
  //
  // MAGNET ANIMATION
  // ========================================================================
  function magnetAnimation() {
    
    return {
      enter: (element, done) => {      
        
        TweenLite.from(element, 0.35, { autoAlpha: 0, scale: 0.5, x: 0, y: 0, onComplete: done });
      },
      leave: (element, done) => {
        
        TweenLite.to(element, 0.1, { autoAlpha: 0, scale: 0.5, onComplete: done });
      },
      addClass: (element, className, done) => {
                        
        if (className === "locked") {          
          
          TweenLite.to(element, 0.25, { backgroundColor: "rgb(163,233,164)", onComplete: done });          
        } else {
          done();
        }
      },
      removeClass: (element, className, done) => {
                
        if (className === "locked") {
          
          TweenLite.to(element, 0.25, { backgroundColor: "rgb(250,250,250)", onComplete: done }); 
        } else {
          done();
        }
      }
    }
  }

  //
  // FIREBASE DATA
  // ========================================================================
  class FirebaseData {
    
    maxMagnets = 100;
    rootRef    = this.firebaseUtils.ref();
    magnetsRef = this.firebaseUtils.ref("magnets").limitToLast(75);
    auth       = this.$firebaseAuth(this.rootRef);

    connectedRef = firebaseUtils.ref(".info/connected");
    viewersRef   = firebaseUtils.ref("viewers");
    
    constructor(
      private $firebaseAuth,
      private $firebaseArray, 
      private $firebaseObject, 
      private firebaseUtils,
      private firebaseUrl) {      
      
      // Prune the list
      var magnets = $firebaseArray(this.magnetsRef.ref());
      magnets.$loaded(event => {
        _.forEachRight(magnets, (magnet, i) => {
          if (i > this.maxMagnets) {
            magnets.$remove(magnet);
          }          
        });
        console.info("MAGNETS:", magnets.length);
      });
    }

    magnet(id) {
      var ref = this.firebaseUtils.ref("magnets", id);
      return this.$firebaseObject(ref);
    }   
  }
  
  //
  // FIREBASE UTILS
  // ========================================================================
  class FirebaseUtils {

    constructor(private $q, private $window, private firebaseUrl) {

    }

    get timestamp() { return Firebase.ServerValue.TIMESTAMP; }

    handler(fn, context) {
      return this.defer(def => {
        fn.call(context, (err, result) => {
          if (err !== null) {
            def.reject(err);
          } else {
            def.resolve(result);
          }
        });
      });
    }

    defer(fn, context) {
      var def = this.$q.defer();
      fn.call(context, def);
      return def.promise;
    }

    pathRef(paths) {
            
      _.forEach(paths, (path, i) => {

        if (_.isArray(path)) {        
          path = this.pathRef(path);   

        } else if(!_.isString(path)) {        
          throw new Error(`Argument ${i} to firebaseRef is not a string: ${path}`);
        }
      });
      
      return paths.join("/");
    }

    ref(...paths) {
      
      var ref = new this.$window.Firebase(this.firebaseUrl);
      if (paths.length) {
        ref = ref.child(this.pathRef(paths))
      }
      return ref;
    }
  } 

  angular
    .module("magnetGame", ["firebase", "ngMaterial", "ngSanitize", "ngMdIcons"])
    .run(startFirebase)
    .constant("firebaseUrl", `https://${firebaseApp}.firebaseIO.com`)
    .controller("MainController", MainController)
    .component("gsMagnet", magnetComponent)
    .service("firebaseData", FirebaseData)
    .service("firebaseUtils", FirebaseUtils)
    .service("Viewers", Viewers)
    .animation(".magnet-animation", magnetAnimation);  
}





              
            
!
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