'use strict';

/* --------------------------------------------------------------
 scroll_top.js 2015-09-23
 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]
 --------------------------------------------------------------
 */

/**
 * ## Scroll Top Module
 *
 * This module will display a scroll-to-top arrow on the left side of the admin menu. When the users
 * press this arrow the browser will automatically scroll to the top of the page.
 *
 * @module Compatibility/scroll_top
 */
gx.compatibility.module(
// Module name
'scroll_top',

// Module dependencies
[],

/**  @lends module:Compatibility/scroll_top */

function () {

    'use strict';

    // ------------------------------------------------------------------------
    // VARIABLES DEFINITION
    // ------------------------------------------------------------------------

    var module = {},
        $button;

    // ------------------------------------------------------------------------
    // EVENT HANDLER
    // ------------------------------------------------------------------------

    var _initialize = function _initialize() {
        $button = $('<div>').addClass('js-scroll-top-button').html('<i class="fa fa-caret-up"></i>').hide().appendTo('body').on('click', function () {
            $('html, body').animate({
                scrollTop: 0
            });
        });

        $(document).on('scroll', function () {
            var reachedMinimumScrolled = $(document).scrollTop() > 2500,
                reachedDocumentBottom = $(document).scrollTop() + window.innerHeight === $(document).height();

            // Fade In / Out
            if (reachedMinimumScrolled) {
                $button.fadeIn();
            } else {
                $button.fadeOut();
            }

            // Fix poistion
            if (reachedMinimumScrolled) {
                $button.css({
                    bottom: reachedDocumentBottom ? '100px' : '50px'
                });
            }
        });

        $(document).on('leftmenu:collapse', function () {
            $button.animate({
                left: '9px'
            });
        });

        $(document).on('leftmenu:expand', function () {
            $button.animate({
                left: '89px'
            });
        });
    };

    // ------------------------------------------------------------------------
    // INITIALIZATION
    // ------------------------------------------------------------------------

    module.init = function (done) {
        _initialize();
        done();
    };

    return module;
});
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