'use strict';

/* --------------------------------------------------------------
 tabs.js 2015-09-30 gm
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * Widget that enables the tabs / accordion
 */
gambio.widgets.module('tabs', [], function (data) {

    'use strict';

    // ########## VARIABLE INITIALIZATION ##########

    var $this = $(this),
        $tabs = null,
        $content = null,
        $tabList = null,
        $contentList = null,
        transition = {
        classOpen: 'active',
        open: false,
        calcHeight: true
    },
        defaults = {},
        options = $.extend(true, {}, defaults, data),
        module = {};

    // ########## HELPER FUNCTIONS ##########

    /**
     * Function that sets the active classes to the
     * tabs and the content headers and shows / hides
     * the content
     * @param       {integer}       index       The index of the clicked element
     * @private
     */
    var _setClasses = function _setClasses(index) {
        // Set the active tab
        $tabList.removeClass('active').eq(index).addClass('active');

        transition.open = false;
        var $hide = $contentList.filter('.active').removeClass('active').children('.tab-body'),
            $show = $contentList.eq(index);

        $show.addClass('active').find('.tab-body').addClass('active');
    };

    // ########## EVENT HANDLER ##########

    /**
     * Click handler for the tabs. It hides
     * all other tab content except it's own
     * @param       {object}    e       jQuery event object
     * @private
     */
    var _clickHandlerTabs = function _clickHandlerTabs(e) {
        e.preventDefault();
        e.stopPropagation();

        var $self = $(this),
            index = $self.index();

        if (!$self.hasClass('active')) {
            _setClasses(index);
        }
    };

    /**
     * Click handler for the accordion. It hides
     * all other tab content except it's own
     * @param       {object}    e       jQuery event object
     * @private
     */
    var _clickHandlerAccordion = function _clickHandlerAccordion(e) {
        e.preventDefault();
        e.stopPropagation();

        var $self = $(this),
            $container = $self.closest('.tab-pane'),
            index = $container.index(),
            containerHeight = $self.height();

        if (!$container.hasClass('active')) {
            _setClasses(index);
        }

        $('html,body').animate({ scrollTop: $self.offset().top - containerHeight }, 'slow');
    };

    // ########## INITIALIZATION ##########

    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {

        $tabs = $this.children('.nav-tabs');
        $tabList = $tabs.children('li');
        $content = $this.children('.tab-content');
        $contentList = $content.children('.tab-pane');

        $this.on('click', '.nav-tabs li', _clickHandlerTabs).on('click', '.tab-content .tab-heading', _clickHandlerAccordion);

        done();
    };

    // Return data to widget engine
    return module;
});
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