'use strict';

/* --------------------------------------------------------------
 slider_size.js 2016-02-04 gm
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * Gets the size of the biggest image from the applied element and puts the previous and next buttons to the right
 * position, if the screen-width is bigger than 1920px.
 */
gambio.widgets.module('slider_size', [], function (data) {

    'use strict';

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

    var $this = $(this),
        defaults = {},
        options = $.extend(true, {}, defaults, data),
        module = {},
        maxWidth = 0,
        nextButton = $('.js-teaser-slider-next.swiper-button-next'),
        prevButton = $('.js-teaser-slider-prev.swiper-button-prev');

    // ########## PRIVATE FUNCTIONS ##########


    /**
     * Gets the biggest image from the applied element and calls the positioning method.
     *
     * @private
     */
    var _getBiggestImageWidth = function _getBiggestImageWidth() {

        var windowWidth = $(window).width();

        $(window).load(function () {
            $('#slider').each(function () {

                $this.find('.swiper-container .swiper-wrapper .swiper-slide img').each(function () {

                    var w = $(this).get(0).naturalWidth;
                    if (w > maxWidth) {
                        maxWidth = w;
                    }
                });
                if (maxWidth && windowWidth > 1920) {
                    _positionButtons(maxWidth);
                }
            });
        });
    };

    /**
     * Puts the previous and next buttons of the swiper to the correct position, if the screen-width is bigger than
     * 1920px
     *
     * @param maxWidth int
     * @private
     */
    var _positionButtons = function _positionButtons(maxWidth) {

        var marginVal = Math.ceil(-(maxWidth / 2) + 30);

        nextButton.css({
            'right': '50%',
            'margin-right': marginVal + 'px'
        });

        prevButton.css({
            'left': '50%',
            'margin-left': marginVal + 'px'
        });
    };

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

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

        _getBiggestImageWidth();

        $(window).resize(function () {
            if ($(window).width() <= 1920 && nextButton.attr('style') && prevButton.attr('style')) {
                nextButton.removeAttr('style');
                prevButton.removeAttr('style');
            } else if ($(window).width() > 1920 && !nextButton.attr('style') && !prevButton.attr('style')) {
                _positionButtons(maxWidth);
            }
        });

        done();
    };

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