(function ($, Drupal, drupalSettings) {

  'use strict';

  Drupal.behaviors.tokenTree = {
    attach: function (context, settings) {
      $('table.token-tree', context).once('token-tree').each(function () {
        $(this).treetable({ expandable: true });
      });
    }
  };

  Drupal.behaviors.tokenInsert = {
    attach: function (context, settings) {
      // Keep track of which textfield was last selected/focused.
      $('textarea, input[type="text"]', context).focus(function () {
        drupalSettings.tokenFocusedField = this;
      });

      $('.token-click-insert .token-key', context).once('token-click-insert').each(function () {
        var newThis = $('<a href="javascript:void(0);" title="' + Drupal.t('Insert this token into your form') + '">' + $(this).html() + '</a>').click(function () {
          var content = this.text;

          // Always work in normal text areas that currently have focus.
          if (drupalSettings.tokenFocusedField && (drupalSettings.tokenFocusedField.tokenDialogFocus || drupalSettings.tokenFocusedField.tokenHasFocus)) {
            insertAtCursor(drupalSettings.tokenFocusedField, content);
          }
          // Direct tinyMCE support.
          else if (typeof(tinyMCE) != 'undefined' && tinyMCE.activeEditor) {
            tinyMCE.activeEditor.execCommand('mceInsertContent', false, content);
          }
          // Direct CKEditor support. Only works if the field currently has focus,
          // which is unusual since the dialog is open.
          else if (typeof(CKEDITOR) != 'undefined' && CKEDITOR.currentInstance) {
            CKEDITOR.currentInstance.insertHtml(content);
          }
          // WYSIWYG support, should work in all editors if available.
          else if (Drupal.wysiwyg && Drupal.wysiwyg.activeId) {
            Drupal.wysiwyg.instances[Drupal.wysiwyg.activeId].insert(content)
          }
          // CKeditor module support.
          else if (typeof(CKEDITOR) != 'undefined' && typeof(Drupal.ckeditorActiveId) != 'undefined') {
            CKEDITOR.instances[Drupal.ckeditorActiveId].insertHtml(content);
          }
          else if (drupalSettings.tokenFocusedField) {
            insertAtCursor(drupalSettings.tokenFocusedField, content);
          }
          else {
            alert(Drupal.t('First click a text field to insert your tokens into.'));
          }

          return false;
        });
        $(this).html(newThis);
      });

      function insertAtCursor(editor, content) {
        // Record the current scroll position.
        var scroll = editor.scrollTop;

        // IE support.
        if (document.selection) {
          editor.focus();
          var sel = document.selection.createRange();
          sel.text = content;
        }

        // Mozilla/Firefox/Netscape 7+ support.
        else if (editor.selectionStart || editor.selectionStart == '0') {
          var startPos = editor.selectionStart;
          var endPos = editor.selectionEnd;
          editor.value = editor.value.substring(0, startPos) + content + editor.value.substring(endPos, editor.value.length);
        }

        // Fallback, just add to the end of the content.
        else {
          editor.value += content;
        }

        // Ensure the textarea does not unexpectedly scroll.
        editor.scrollTop = scroll;
      }
    }
  };

})(jQuery, Drupal, drupalSettings);