/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';

var angular = require('angular');

module.exports = function ($scope, $window, $document) {
  'ngInject';

  $scope.follow = false;

  $scope.toggleFollow = function () {
    $scope.follow = !$scope.follow;
    $scope.updateview();
  };

  $scope.scrollToTop = function () {
    $window.scrollTo($window.scrollX, 0);
  };

  $scope.updateview = function () {
    if ($scope.follow) {
      $window.scrollTo($window.scrollX, $document[0].body.scrollHeight);
    }
  };

  angular.element($window).bind('scroll', function () {
    var atBottom = ($window.innerHeight + $window.scrollY) >= $document[0].body.offsetHeight;
    if (!atBottom && $scope.follow) {
      $scope.follow = false;
      $scope.$apply();
    }
  });

};
