(function ($) {

/**

 * Add functionality to the profile drag and drop table.

 *

 * This behavior is dependent on the tableDrag behavior, since it uses the

 * objects initialized in that behavior to update the row. It shows and hides

 * a warning message when removing the last field from a profile category.

 */

Drupal.behaviors.profileDrag = {

  attach: function (context, settings) {

    var table = $('#profile-fields');

    var tableDrag = Drupal.tableDrag['profile-fields']; // Get the profile tableDrag object.

    // Add a handler for when a row is swapped, update empty categories.

    tableDrag.row.prototype.onSwap = function (swappedRow) {

      var rowObject = this;

      $('tr.category-message', table).each(function () {

        // If the dragged row is in this category, but above the message row, swap it down one space.

        if ($(this).prev('tr').get(0) == rowObject.element) {

          // Prevent a recursion problem when using the keyboard to move rows up.

          if ((rowObject.method != 'keyboard' || rowObject.direction == 'down')) {

            rowObject.swap('after', this);

          }

        }

        // This category has become empty

        if ($(this).next('tr').is(':not(.draggable)') || $(this).next('tr').length == 0) {

          $(this).removeClass('category-populated').addClass('category-empty');

        }

        // This category has become populated.

        else if ($(this).is('.category-empty')) {

          $(this).removeClass('category-empty').addClass('category-populated');

        }

      });

    };

    // Add a handler so when a row is dropped, update fields dropped into new categories.

    tableDrag.onDrop = function () {

      dragObject = this;

      if ($(dragObject.rowObject.element).prev('tr').is('.category-message')) {

        var categoryRow = $(dragObject.rowObject.element).prev('tr').get(0);

        var categoryNum = categoryRow.className.replace(/([^ ]+[ ]+)*category-([^ ]+)-message([ ]+[^ ]+)*/, '$2');

        var categoryField = $('select.profile-category', dragObject.rowObject.element);

        var weightField = $('select.profile-weight', dragObject.rowObject.element);

        var oldcategoryNum = weightField[0].className.replace(/([^ ]+[ ]+)*profile-weight-([^ ]+)([ ]+[^ ]+)*/, '$2');

        if (!categoryField.is('.profile-category-' + categoryNum)) {

          categoryField.removeClass('profile-category-' + oldcategoryNum).addClass('profile-category-' + categoryNum);

          weightField.removeClass('profile-weight-' + oldcategoryNum).addClass('profile-weight-' + categoryNum);

          categoryField.val(categoryField[0].options[categoryNum].value);

        }

      }

    };

  }

};

})(jQuery);