'use strict';

/* --------------------------------------------------------------
 sticky_footer.js 2015-09-14 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]
 --------------------------------------------------------------
 */

/**
 * ## Handle footer position for backend.
 *
 * This module will handle the footer position on scrolling or whenever the page window size changes.
 *
 * @module Compatibility/sticky_footer
 */
gx.compatibility.module('sticky_footer', [],

/**  @lends module:Compatibility/sticky_footer */

function (data) {

    'use strict';

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

    var
    /**
     * Module Selector
     *
     * @var {object}
     */
    $this = $(this),


    /**
     * Copyright Element Selector
     *
     * @var {object}
     */
    $copyright = $('.main-bottom-copyright'),


    /**
     * Footer Offset Top
     *
     * @var {int}
     */
    initialOffsetTop = $this.offset().top,


    /**
     * Default Options
     *
     * @type {object}
     */
    defaults = {},


    /**
     * Final Options
     *
     * @var {object}
     */
    options = $.extend(true, {}, defaults, data),


    /**
     * Module Object
     *
     * @type {object}
     */
    module = {};

    // ------------------------------------------------------------------------
    // EVENT HANDLERS
    // ------------------------------------------------------------------------

    var _checkOffset = function _checkOffset() {
        var copyrightOffsetTop = $copyright.offset().top;
        if (copyrightOffsetTop == 0) {
            copyrightOffsetTop = 50; // default value to avoid a bug refs #55075
        }
        if ($(document).scrollTop() + window.innerHeight < copyrightOffsetTop) {
            $this.css('position', 'fixed');
        } else if ($this.offset().top + $this.height() >= copyrightOffsetTop) {
            $this.css('position', 'absolute');
        }
    };

    var _fixMainContentHeight = function _fixMainContentHeight() {
        if (initialOffsetTop + $this.height() <= window.innerHeight) {
            var newContentHeight = window.innerHeight - $('.main-page-content').offset().top;
            $('.main-page-content').css('min-height', newContentHeight + 'px');
            // First table of the page needs to be also resized.
            $('td.columnLeft2').parents('table:first').css('min-height', newContentHeight + 'px');
        }
    };

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

    module.init = function (done) {
        // Delay the footer position by some time until so that most elements are rendered
        // properly. Adjust the timeout interval approximately.
        setTimeout(function () {
            _fixMainContentHeight();

            $(window).on('scroll', _checkOffset).on('resize', _checkOffset).on('resize', _fixMainContentHeight);
            _checkOffset();
        }, 300);

        done();
    };

    return module;
});
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