/**

 * Suggests users in a multisite environment.

 *

 * For input fields where the admin can select a user based on email or

 * username, this script shows an autocompletion menu for these inputs. Should

 * only be used in a multisite environment. Only users in the currently active

 * site are shown.

 *

 * @since 3.4.0

 * @output wp-admin/js/user-suggest.js

 */

/* global ajaxurl, current_site_id, isRtl */

(function( $ ) {

	var id = ( typeof current_site_id !== 'undefined' ) ? '&site_id=' + current_site_id : '';

	$( function() {

		var position = { offset: '0, -1' };

		if ( typeof isRtl !== 'undefined' && isRtl ) {

			position.my = 'right top';

			position.at = 'right bottom';

		}

		/**

		 * Adds an autocomplete function to input fields marked with the class

		 * 'wp-suggest-user'.

		 *

		 * A minimum of two characters is required to trigger the suggestions. The

		 * autocompletion menu is shown at the left bottom of the input field. On

		 * RTL installations, it is shown at the right top. Adds the class 'open' to

		 * the input field when the autocompletion menu is shown.

		 *

		 * Does a backend call to retrieve the users.

		 *

		 * Optional data-attributes:

		 * - data-autocomplete-type (add, search)

		 *   The action that is going to be performed: search for existing users

		 *   or add a new one. Default: add

		 * - data-autocomplete-field (user_login, user_email)

		 *   The field that is returned as the value for the suggestion.

		 *   Default: user_login

		 *

		 * @see wp-admin/includes/admin-actions.php:wp_ajax_autocomplete_user()

		 */

		$( '.wp-suggest-user' ).each( function(){

			var $this = $( this ),

				autocompleteType = ( typeof $this.data( 'autocompleteType' ) !== 'undefined' ) ? $this.data( 'autocompleteType' ) : 'add',

				autocompleteField = ( typeof $this.data( 'autocompleteField' ) !== 'undefined' ) ? $this.data( 'autocompleteField' ) : 'user_login';

			$this.autocomplete({

				source:    ajaxurl + '?action=autocomplete-user&autocomplete_type=' + autocompleteType + '&autocomplete_field=' + autocompleteField + id,

				delay:     500,

				minLength: 2,

				position:  position,

				open: function() {

					$( this ).addClass( 'open' );

				},

				close: function() {

					$( this ).removeClass( 'open' );

				}

			});

		});

	});

})( jQuery );