/*****************************************************************************
 * Open MCT Web, Copyright (c) 2014-2015, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT Web is 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.
 *
 * Open MCT Web includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/
/*global define,Promise*/


define(
    [],
    function () {
        "use strict";

        /**
         * Controller to provide the ability to show/hide the tree in
         * Browse mode.
         * @constructor
         * @memberof platform/commonUI/browse
         */
        function BrowseTreeController($scope, navigationService, agentService) {
            var object = navigationService.getNavigation(),
                self = this;

            // Collapse tree when navigation changes
            function changeObject(newObject) {
                if (newObject !== object && agentService.isPortrait()) {
                    object = newObject;
                    self.state = false;
                }
            }

            // On phones, trees should collapse in portrait mode
            // when something is navigated-to.
            if (agentService.isPhone()) {
                navigationService.addListener(changeObject);
                $scope.$on("$destroy", function () {
                    navigationService.removeListener(changeObject);
                });
            }

            this.state = true;
        }

        /**
         * Toggle the visibility of the tree.
         */
        BrowseTreeController.prototype.toggle = function () {
            this.state = !this.state;
        };

        /**
         * Get the desired visibility state of the tree.
         * @returns {boolean} true when visible
         */
        BrowseTreeController.prototype.visible = function () {
            return this.state;
        };

        return BrowseTreeController;
    }
);