/**

 * @file

 * Provides JavaScript additions to the managed file field type.

 *

 * This file provides progress bar support (if available), popup windows for

 * file previews, and disabling of other file fields during Ajax uploads (which

 * prevents separate file fields from accidentally uploading files).

 */

(function ($) {

/**

 * Attach behaviors to managed file element upload fields.

 */

Drupal.behaviors.fileValidateAutoAttach = {

  attach: function (context, settings) {

    if (settings.file && settings.file.elements) {

      $.each(settings.file.elements, function(selector) {

        var extensions = settings.file.elements[selector];

        $(selector, context).bind('change', {extensions: extensions}, Drupal.file.validateExtension);

      });

    }

  },

  detach: function (context, settings) {

    if (settings.file && settings.file.elements) {

      $.each(settings.file.elements, function(selector) {

        $(selector, context).unbind('change', Drupal.file.validateExtension);

      });

    }

  }

};

/**

 * Attach behaviors to the file upload and remove buttons.

 */

Drupal.behaviors.fileButtons = {

  attach: function (context) {

    $('input.form-submit', context).bind('mousedown', Drupal.file.disableFields);

    $('div.form-managed-file input.form-submit', context).bind('mousedown', Drupal.file.progressBar);

  },

  detach: function (context) {

    $('input.form-submit', context).unbind('mousedown', Drupal.file.disableFields);

    $('div.form-managed-file input.form-submit', context).unbind('mousedown', Drupal.file.progressBar);

  }

};

/**

 * Attach behaviors to links within managed file elements.

 */

Drupal.behaviors.filePreviewLinks = {

  attach: function (context) {

    $('div.form-managed-file .file a, .file-widget .file a', context).bind('click',Drupal.file.openInNewWindow);

  },

  detach: function (context){

    $('div.form-managed-file .file a, .file-widget .file a', context).unbind('click', Drupal.file.openInNewWindow);

  }

};

/**

 * File upload utility functions.

 */

Drupal.file = Drupal.file || {

  /**

   * Client-side file input validation of file extensions.

   */

  validateExtension: function (event) {

    // Remove any previous errors.

    $('.file-upload-js-error').remove();

    // Add client side validation for the input[type=file].

    var extensionPattern = event.data.extensions.replace(/,\s*/g, '|');

    if (extensionPattern.length > 1 && this.value.length > 0) {

      var acceptableMatch = new RegExp('\\.(' + extensionPattern + ')$', 'gi');

      if (!acceptableMatch.test(this.value)) {

        var error = Drupal.t("The selected file %filename cannot be uploaded. Only files with the following extensions are allowed: %extensions.", {

          // According to the specifications of HTML5, a file upload control

          // should not reveal the real local path to the file that a user

          // has selected. Some web browsers implement this restriction by

          // replacing the local path with "C:\fakepath\", which can cause

          // confusion by leaving the user thinking perhaps Drupal could not

          // find the file because it messed up the file path. To avoid this

          // confusion, therefore, we strip out the bogus fakepath string.

          '%filename': this.value.replace('C:\\fakepath\\', ''),

          '%extensions': extensionPattern.replace(/\|/g, ', ')

        });

        $(this).closest('div.form-managed-file').prepend('<div class="messages error file-upload-js-error" aria-live="polite">' + error + '</div>');

        this.value = '';

        return false;

      }

    }

  },

  /**

   * Prevent file uploads when using buttons not intended to upload.

   */

  disableFields: function (event){

    var clickedButton = this;

    // Only disable upload fields for Ajax buttons.

    if (!$(clickedButton).hasClass('ajax-processed')) {

      return;

    }

    // Check if we're working with an "Upload" button.

    var $enabledFields = [];

    if ($(this).closest('div.form-managed-file').length > 0) {

      $enabledFields = $(this).closest('div.form-managed-file').find('input.form-file');

    }

    // Temporarily disable upload fields other than the one we're currently

    // working with. Filter out fields that are already disabled so that they

    // do not get enabled when we re-enable these fields at the end of behavior

    // processing. Re-enable in a setTimeout set to a relatively short amount

    // of time (1 second). All the other mousedown handlers (like Drupal's Ajax

    // behaviors) are excuted before any timeout functions are called, so we

    // don't have to worry about the fields being re-enabled too soon.

    // @todo If the previous sentence is true, why not set the timeout to 0?

    var $fieldsToTemporarilyDisable = $('div.form-managed-file input.form-file').not($enabledFields).not(':disabled');

    $fieldsToTemporarilyDisable.attr('disabled', 'disabled');

    setTimeout(function (){

      $fieldsToTemporarilyDisable.attr('disabled', false);

    }, 1000);

  },

  /**

   * Add progress bar support if possible.

   */

  progressBar: function (event) {

    var clickedButton = this;

    var $progressId = $(clickedButton).closest('div.form-managed-file').find('input.file-progress');

    if ($progressId.length) {

      var originalName = $progressId.attr('name');

      // Replace the name with the required identifier.

      $progressId.attr('name', originalName.match(/APC_UPLOAD_PROGRESS|UPLOAD_IDENTIFIER/)[0]);

      // Restore the original name after the upload begins.

      setTimeout(function () {

        $progressId.attr('name', originalName);

      }, 1000);

    }

    // Show the progress bar if the upload takes longer than half a second.

    setTimeout(function () {

      $(clickedButton).closest('div.form-managed-file').find('div.ajax-progress-bar').slideDown();

    }, 500);

  },

  /**

   * Open links to files within forms in a new window.

   */

  openInNewWindow: function (event) {

    $(this).attr('target', '_blank');

    window.open(this.href, 'filePreview', 'toolbar=0,scrollbars=1,location=1,statusbar=1,menubar=0,resizable=1,width=500,height=550');

    return false;

  }

};

})(jQuery);