define([
  'angular',
  'app',
  'underscore'
],
function (angular, app, _) {
  'use strict';

  var module = angular.module('kibana.controllers');

  module.controller('ZoomCtrl', function($scope, filterSrv) {

    // function $scope.zoom
    // factor :: Zoom factor, so 0.5 = cuts timespan in half, 2 doubles timespan
    $scope.zoom = function(factor) {
      var _range = filterSrv.timeRange('last');
      var _timespan = (_range.to.valueOf() - _range.from.valueOf());
      var _center = _range.to.valueOf() - _timespan/2;

      var _to = (_center + (_timespan*factor)/2);
      var _from = (_center - (_timespan*factor)/2);

      // If we're not already looking into the future, don't.
      if(_to > Date.now() && _range.to < Date.now()) {
        var _offset = _to - Date.now();
        _from = _from - _offset;
        _to = Date.now();
      }

      if(factor > 1) {
        filterSrv.removeByType('time');
      }
      filterSrv.set({
        type:'time',
        from:moment.utc(_from).toDate(),
        to:moment.utc(_to).toDate(),
        field:"@timestamp"
      });
    };

  });

});