var app = angular.module('app', []);

app.controller('interactionCrtl', ['$scope', function($scope){
  $scope.nextState = function(widget){
    widget.stateIndex++;
    if(widget.stateIndex > widget.states.length - 1){
      widget.stateIndex = 0;
    }
    widget.state = widget.states[widget.stateIndex];
  };
}]);