/*

   * jQuery Iframe Transport Plugin 1.7

   * https://github.com/blueimp/jQuery-File-Upload
   *
   * Copyright 2011, Sebastian Tschan
   * https://blueimp.net
   *
   * Licensed under the MIT license:
   * http://www.opensource.org/licenses/MIT
   */
  
  /*jslint unparam: true, nomen: true */
  /*global define, window, document */
  
  (function (factory) {
      'use strict';
      if (typeof define === 'function' && define.amd) {
          // Register as an anonymous AMD module:
          define(['jquery'], factory);
      } else {
          // Browser globals:
          factory(window.jQuery);
      }
  }(function ($) {
      'use strict';
  
      // Helper variable to create unique names for the transport iframes:
      var counter = 0;
  
      // The iframe transport accepts three additional options:
      // options.fileInput: a jQuery collection of file input fields
      // options.paramName: the parameter name for the file form data,

      //  overrides the name property of the file input field(s),
      //  can be a string or an array of strings.

      // options.formData: an array of objects with name and value properties,
      //  equivalent to the return data of .serializeArray(), e.g.:
      //  [{name: 'a', value: 1}, {name: 'b', value: 2}]
      $.ajaxTransport('iframe', function (options) {

          if (options.async) {

              var form,

                  iframe,
                  addParamChar;

              return {
                  send: function (_, completeCallback) {
                      form = $('<form style="display:none;"></form>');

                      form.attr('accept-charset', options.formAcceptCharset);
                      addParamChar = /\?/.test(options.url) ? '&' : '?';
                      // XDomainRequest only supports GET and POST:
                      if (options.type === 'DELETE') {
                          options.url = options.url + addParamChar + '_method=DELETE';
                          options.type = 'POST';
                      } else if (options.type === 'PUT') {
                          options.url = options.url + addParamChar + '_method=PUT';
                          options.type = 'POST';
                      } else if (options.type === 'PATCH') {
                          options.url = options.url + addParamChar + '_method=PATCH';
                          options.type = 'POST';
                      }

                      // javascript:false as initial iframe src
                      // prevents warning popups on HTTPS in IE6.
                      // IE versions below IE8 cannot set the name property of
                      // elements that have already been added to the DOM,
                      // so we set the name along with the iframe HTML markup:

                      counter += 1;

                      iframe = $(
                          '<iframe src="javascript:false;" name="iframe-transport-' +

                              counter + '"></iframe>'

                      ).bind('load', function () {

                          var fileInputClones,
                              paramNames = $.isArray(options.paramName) ?
                                      options.paramName : [options.paramName];

                          iframe
                              .unbind('load')
                              .bind('load', function () {
                                  var response;
                                  // Wrap in a try/catch block to catch exceptions thrown
                                  // when trying to access cross-domain iframe contents:
                                  try {
                                      response = iframe.contents();
                                      // Google Chrome and Firefox do not throw an
                                      // exception when calling iframe.contents() on
                                      // cross-domain requests, so we unify the response:
                                      if (!response.length || !response[0].firstChild) {
                                          throw new Error();
                                      }
                                  } catch (e) {
                                      response = undefined;
                                  }
                                  // The complete callback returns the
                                  // iframe content document as response object:
                                  completeCallback(
                                      200,
                                      'success',
                                      {'iframe': response}
                                  );
                                  // Fix for IE endless progress bar activity bug
                                  // (happens on form submits to iframe targets):
                                  $('<iframe src="javascript:false;"></iframe>')
                                      .appendTo(form);

                                  window.setTimeout(function () {
                                      // Removing the form in a setTimeout call
                                      // allows Chrome's developer tools to display
                                      // the response result
                                      form.remove();
                                  }, 0);

                              });
                          form
                              .prop('target', iframe.prop('name'))
                              .prop('action', options.url)
                              .prop('method', options.type);
                          if (options.formData) {
                              $.each(options.formData, function (index, field) {
                                  $('<input type="hidden"/>')
                                      .prop('name', field.name)
                                      .val(field.value)
                                      .appendTo(form);
                              });
                          }
                          if (options.fileInput && options.fileInput.length &&
                                  options.type === 'POST') {
                              fileInputClones = options.fileInput.clone();
                              // Insert a clone for each file input field:
                              options.fileInput.after(function (index) {
                                  return fileInputClones[index];
                              });
                              if (options.paramName) {

                                  options.fileInput.each(function (index) {
                                      $(this).prop(
                                          'name',
                                          paramNames[index] || options.paramName
                                      );

                                  });
                              }
                              // Appending the file input fields to the hidden form
                              // removes them from their original location:
                              form
                                  .append(options.fileInput)
                                  .prop('enctype', 'multipart/form-data')
                                  // enctype must be set as encoding for IE:
                                  .prop('encoding', 'multipart/form-data');
                          }
                          form.submit();
                          // Insert the file input fields at their original location
                          // by replacing the clones with the originals:
                          if (fileInputClones && fileInputClones.length) {
                              options.fileInput.each(function (index, input) {
                                  var clone = $(fileInputClones[index]);
                                  $(input).prop('name', clone.prop('name'));
                                  clone.replaceWith(input);
                              });
                          }
                      });
                      form.append(iframe).appendTo(document.body);
                  },
                  abort: function () {
                      if (iframe) {
                          // javascript:false as iframe src aborts the request
                          // and prevents warning popups on HTTPS in IE6.
                          // concat is used to avoid the "Script URL" JSLint error:
                          iframe
                              .unbind('load')
                              .prop('src', 'javascript'.concat(':false;'));
                      }
                      if (form) {
                          form.remove();
                      }
                  }
              };
          }
      });
  
      // The iframe transport returns the iframe content document as response.

      // The following adds converters from iframe to text, json, html, xml
      // and script.
      // Please note that the Content-Type for JSON responses has to be text/plain
      // or text/html, if the browser doesn't include application/json in the
      // Accept header, else IE will show a download dialog.
      // The Content-Type for XML responses on the other hand has to be always
      // application/xml or text/xml, so IE properly parses the XML response.
      // See also
      // https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#content-type-negotiation

      $.ajaxSetup({
          converters: {
              'iframe text': function (iframe) {

                  return iframe && $(iframe[0].body).text();

              },
              'iframe json': function (iframe) {

                  return iframe && $.parseJSON($(iframe[0].body).text());

              },
              'iframe html': function (iframe) {

                  return iframe && $(iframe[0].body).html();
              },
              'iframe xml': function (iframe) {
                  var xmlDoc = iframe && iframe[0];
                  return xmlDoc && $.isXMLDoc(xmlDoc) ? xmlDoc :
                          $.parseXML((xmlDoc.XMLDocument && xmlDoc.XMLDocument.xml) ||
                              $(xmlDoc.body).html());

              },
              'iframe script': function (iframe) {

                  return iframe && $.globalEval($(iframe[0].body).text());

              }
          }
      });

  }));