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/**
 * Replaces all img elements that use SVG and SVGZ (compressed SVG) images
 * as the source with an inline SVG element.
 *
 * Note: if any img DOM elements using svgs are cached before this
 * function, they will no longer be valid as these elements
 * will be replaced.
 *
 * To get around this, pass a callback function to this methods parameter
 * that will be execute once all images have finished loading.
 *
 * @param callback
 */
function SVGInline(callback) {

  var images = $('img');
  var images_length = images.length;

  function request_end() {

    images_length -= 1;

    if (images_length === 0) {
      callback();
    }

  }

  images.each(function () {
    var img = $(this);
    var imgURL = img.attr('src');
    var file_extension = imgURL.substr(imgURL.lastIndexOf('.') + 1);

    // If the file extension is svg or svgz, replace element for inline svg
    if (file_extension === 'svg' || file_extension === 'svgz') {
      var imgWidth = img.attr('width');
      var imgHeight = img.attr('height');
      var imgID = img.attr('id');
      var imgClass = img.attr('class');

      // Get svg file (note this could be optimised if the image has already
      // been downloaded to not GET request the resource again)
      $.ajax({
        "url": imgURL,
        "success": function (data) {
          // Get the SVG tag, ignore the rest
          var svg = $(data).find('svg');

          // Add replaced image's width to the new SVG
          if (typeof imgWidth !== 'undefined')
            svg = svg.attr('width', imgWidth);

          // Add replaced image's height to the new SVG
          if (typeof imgHeight !== 'undefined')
            svg = svg.attr('height', imgHeight);

          // Add replaced image's ID to the new SVG
          if (typeof imgID !== 'undefined')
            svg = svg.attr('id', imgID);

          // Add replaced image's classes to the new SVG
          if (typeof imgClass !== 'undefined')
            svg = svg.attr('class', imgClass);

          // Remove any invalid XML tags as per http://validator.w3.org
          svg = svg.removeAttr('xmlns:a');

          // Replace image with new SVG
          img.replaceWith(svg);
        },
        "complete": function(){
          request_end();
        },
        "dataType": 'xml'
      });
    }
    else {
      request_end();
    }
  });
}