/* --------------------------------------------------------------
 image_gallery.js 2016-03-09
 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 opens the gallery modal layer (which is
 * used for the article pictures)
 */
gambio.widgets.module(
    'image_gallery',

    [
        gambio.source + '/libs/modal.ext-magnific',
        gambio.source + '/libs/modal',
        gambio.source + '/libs/events',
        gambio.source + '/libs/responsive'
    ],

    function (data) {

        'use strict';

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

        var $this = $(this),
            $template = null,
            $body = $('body'),
            layer = null,
            configuration = {                                       // Modal layer configuration
                noTemplate: false,
                preloader: true,
                closeOnOuter: true,
                dialogClass: 'product_images',
                gallery: {
                    enabled: true
                }
            },
            defaults = {
                target: '.swiper-slide', // Selector for the click event listener
                template: '#product_image_layer', // Template that is used for the layer
                breakpoint: 40 // Maximum breakpoint for mobile view mode
            },
            options = $.extend(true, {}, defaults, data),
            module = {};

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

        /**
         * Click event handler that configures the swiper(s)
         * inside the layer and opens it afterwards
         * @param       {object}    e       jQuery event object
         * @private
         */
        var _clickHandler = function (e) {
            e.preventDefault();

            // Only open in desktop mode
            if (jse.libs.theme.responsive.breakpoint().id > options.breakpoint) {
                var $self = $(this),
                    $swiper = $template.find('[data-swiper-slider-options]'),
                    dataset = $self.data(),
                    index = dataset.index || dataset.swiperSlideIndex || 0;

                // Loop that replaces the initial slide of
                // each swiper inside the layer
                $swiper.each(function () {
                    $(this).attr('data-swiper-init-slide', index);
                });

                // Opens the modal layer
                layer = jse.libs.theme.modal.custom(configuration);
            }

        };

        /**
         * Handler which closes an opened gallery if the
         * screen width gets under the size of an desktop mode
         * @private
         */
        var _breakpointHandler = function () {
            if (jse.libs.theme.responsive.breakpoint().id <= options.breakpoint && layer) {
                layer.close(true);
            }
        };

        /**
         * Event handler to append / remove slides from the
         * gallery layer swipers
         * @param       {object}        e           jQuery event object
         * @param       {object}        d           JSON data of the images
         * @private
         */
        var _addSlides = function (e, d) {

            // Loops through all swipers inside the layer
            $template
                .find('.swiper-container template')
                .each(function () {
                    var $tpl = $(this),
                        $slideContainer = $tpl.siblings('.swiper-wrapper');

                    // Loops through each category inside the images array
                    $.each(d, function (category, dataset) {
                        var catName = category + '-category',
                            add = '',
                            markup = $tpl.html();

                        // Generate the markup for the new slides
                        // and replace the old images of that category
                        // eith the new ones
                        $.each(dataset || [], function (i, v) {
                            v.className = catName;
                            add += Mustache.render(markup, v);
                        });

                        $slideContainer
                            .find('.' + catName)
                            .remove();

                        $slideContainer.append(add);
                    });
                });
        };


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

        /**
         * Init function of the widget
         *
         * @constructor
         */
        module.init = function (done) {
            configuration.template = options.template;
            $template = $(options.template);

            $this
                .on('click', options.target, _clickHandler)
                .on(jse.libs.theme.events.SLIDES_UPDATE(), _addSlides);

            $body
                .on(jse.libs.theme.events.BREAKPOINT(), _breakpointHandler);

            done();
        };

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