text: /*global PhotoSwipeUI_Default*/
  /*global PhotoSwipe*/
  
  module.exports = function(options) {
    var gallerySelector = options.selector;
    var swiper = options.swiper;
  
    var parseThumbnailElements = function(el) {
      var thumbElements = el.querySelectorAll('[ui-gallery-item]');
      var numNodes = thumbElements.length,
        items = [],
        figureEl,
        linkEl,
        size,
        item;
  
      for (var i = 0; i < numNodes; i++) {
        figureEl = thumbElements[i]; // <figure> element
  
        // include only element nodes
        if (figureEl.nodeType !== 1) {
          continue;
        }
  
        linkEl = figureEl.children[0]; // <a> element
        item = {
          src: linkEl.getAttribute('href')
        };
  
  
        size = linkEl.getAttribute('data-size') || '1000x1000';
        size = size.split('x');
        item.w = parseInt(size[0], 10) || 1000;
        item.h = parseInt(size[1], 10) || 1000;
        // create slide object
  
  
        if (figureEl.children.length > 1) {
          // <figcaption> content
          item.title = figureEl.children[1].innerHTML;
        }
  
        if (linkEl.children.length > 0) {
          // <img> thumbnail element, retrieving thumbnail url
          item.msrc = linkEl.children[0].getAttribute(options.src || 'src');
        }
  
        item.el = figureEl; // save link to element for getThumbBoundsFn
        items.push(item);
      }
      return items;
    };
  
    // find nearest parent element
    var closest = function closest(el, fn) {
      return el && (fn(el) ? el : closest(el.parentNode, fn));
    };
  
    // triggers when user clicks on thumbnail
    var onThumbnailsClick = function(e) {
      e = e || window.event;
      e.preventDefault ? e.preventDefault() : (e.returnValue = false);
  
      var eTarget = e.target || e.srcElement;
  
      // find root element of slide
      var clickedListItem = closest(eTarget, function(el) {
        //console.log(el.getAttribute('ui-gallery-item'));
        return el.getAttribute('ui-gallery-item') != null;
      });
  
      if (!clickedListItem) {
        return;
      }
  
      var parentNode = closest(eTarget, function(el) {
        return el.getAttribute('ui-gallery') != null;
      });
  
      if (!parentNode) {
        return;
      }
  
      var childNodes = parentNode.querySelectorAll('[ui-gallery-item]');
  
      // find index of clicked item by looping through all child nodes
      // alternatively, you may define index via data- attribute
      var clickedGallery = parentNode,
        numChildNodes = childNodes.length,
        nodeIndex = 0,
        index;
  
      for (var i = 0; i < numChildNodes; i++) {
        if (childNodes[i].nodeType !== 1) {
          continue;
        }
  
        if (childNodes[i] === clickedListItem) {
          index = nodeIndex;
          break;
        }
        nodeIndex++;
      }
      if (index >= 0) {
        // open PhotoSwipe if valid index found
        openPhotoSwipe(index, clickedGallery);
      }
      return false;
    };
  
    // parse picture index and gallery index from URL (#&pid=1&gid=2)
    var photoswipeParseHash = function() {
      var hash = window.location.hash.substring(1),
        params = {};
  
      if (hash.length < 5) {
        return params;
      }
  
      var vars = hash.split('&');
      for (var i = 0; i < vars.length; i++) {
        if (!vars[i]) {
          continue;
        }
        var pair = vars[i].split('=');
        if (pair.length < 2) {
          continue;
        }
        params[pair[0]] = pair[1];
      }
  
      if (params.gid) {
        params.gid = parseInt(params.gid, 10);
      }
  
      return params;
    };
  
    var openPhotoSwipe = function(
      index,
      galleryElement,
      disableAnimation,
      fromURL
    ) {
      var pswpElement = document.querySelectorAll('.pswp')[0],
        gallery,
        options,
        items;
  
      items = parseThumbnailElements(galleryElement);
      // define options (if needed)
  
      options = {
        /* "showHideOpacity" uncomment this If dimensions of your small thumbnail don't match dimensions of large image */
        //showHideOpacity:true,
  
        // Buttons/elements
        closeEl: true,
        captionEl: true,
        fullscreenEl: true,
        zoomEl: true,
        history: false,
        shareEl: true,
        counterEl: true,
        arrowEl: true,
        preloaderEl: true,
        // define gallery index (for URL)
        galleryUID: galleryElement.getAttribute('data-pswp-uid'),
  
        getThumbBoundsFn: function(index) {
          // See Options -> getThumbBoundsFn section of documentation for more info
          var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
            pageYScroll =
            window.pageYOffset || document.documentElement.scrollTop,
            rect = thumbnail.getBoundingClientRect();
  
          return {
            x: rect.left,
            y: rect.top + pageYScroll,
            w: rect.width
          };
        }
      };
  
      // PhotoSwipe opened from URL
      if (fromURL) {
        if (options.galleryPIDs) {
          // parse real index when custom PIDs are used
          // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
          for (var j = 0; j < items.length; j++) {
            if (items[j].pid == index) {
              options.index = j;
              break;
            }
          }
        } else {
          // in URL indexes start from 1
          options.index = parseInt(index, 10) - 1;
        }
      } else {
        options.index = parseInt(index, 10);
      }
  
      // exit if index not found
      if (isNaN(options.index)) {
        return;
      }
  
      if (disableAnimation) {
        options.showAnimationDuration = 0;
      }
      console.log(items, options);
      // Pass data to PhotoSwipe and initialize it
      gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
      gallery.init();
  
      /* EXTRA CODE (NOT FROM THE CORE) - UPDATE SWIPER POSITION TO THE CURRENT ZOOM_IN IMAGE (BETTER UI) */
  
      // photoswipe event: Gallery unbinds events
      // (triggers before closing animation)
      gallery.listen('unbindEvents', function() {
        // This is index of current photoswipe slide
        var getCurrentIndex = gallery.getCurrentIndex();
        // Update position of the slider
        if (swiper) {
          swiper.slideTo(getCurrentIndex, false);
        }
      });
    };
  
    // loop through all gallery elements and bind events
    var galleryElements = document.querySelectorAll(gallerySelector);
  
    for (var i = 0, l = galleryElements.length; i < l; i++) {
      galleryElements[i].setAttribute('data-pswp-uid', i + 1);
      galleryElements[i].onclick = onThumbnailsClick;
    }
  
    // Parse URL and open gallery if it contains #&pid=3&gid=1
    var hashData = photoswipeParseHash();
  
    if (hashData.pid && hashData.gid) {
      openPhotoSwipe(hashData.pid, galleryElements[hashData.gid - 1], true, true);
    }
  };
  