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/**
 * jQuery Select2 Sortable
 * - enable select2 to be sortable via normal select element
 *
 * author      : Vafour
 * modified    : Kevin Provance (kprovance)
 * inspired by : jQuery Chosen Sortable (https://github.com/mrhenry/jquery-chosen-sortable)
 * License     : GPL
 */

/* global jQuery */

(function( $ ) {
	'use strict';

$.fn.extend(
		{
			select2SortableOrder: function() {
				var $this = this.filter( '[multiple]' );

$this.each(
					function() {
						var li;
						var $select2;
						var sorted;
						var optArr  = [];
						var $select = $( this );

// skip elements not select2-ed.
						if ( typeof ($select.data( 'select2' )) !== 'object' ) {
							return false;
						}

$select2 = $select.siblings( '.select2-container' );

$select.find( 'optgroup' ).each(
							function( idx, val ) {
								optArr.push( val );
							}
						);

$select.find( 'option' ).each(
							function( idx, val ) {
								var groupName = $( this ).parent( 'optgroup' ).prop( 'label' );
								var optVal    = this;

if ( groupName === undefined ) {
									if ( this.value !== '' && ! this.selected ) {
										optArr.push( optVal );
									}
								}
							}
						);

li = $select2.find( '.select2-selection__rendered li[class!="select2-search__field"]' );

sorted = $(
							li.map(
								function( idx, val ) {
									var curTitle;
									var theData;
									var dataTitle;
									var dataID;
									var id;

if ( ! this ) {
										return undefined;
									}

curTitle = $(this).attr('title');
									theData  = $select.select2('data');

$.each(
										theData,
										function(i, v ){
											dataTitle = v.text;

if ( curTitle === dataTitle ) {
												dataID = v.id;

return false;
											}
										}
									);

if ( theData[idx] !== undefined ) {
										id = dataID;

return $select.find( 'option[value="' + id + '"]' )[0];
									}
								}
							)
						);

sorted.push.apply( sorted, optArr );

$select.children().remove();
						$select.append( sorted );
					}
				);

return $this;
			},

select2Sortable: function() {
				var args         = Array.prototype.slice.call( arguments, 0 );
				var $this        = this.filter( '[multiple]' );
				var validMethods = ['destroy'];

if ( args.length === 0 || typeof (args[0]) === 'object' ) {
					var defaultOptions = {
						bindOrder: 'formSubmit', // or sortableStop.
						sortableOptions: {
							placeholder: 'ui-state-highlight',
							items: 'li:not(.select2-search__field)',
							tolerance: 'pointer'
						}
					};

var options = $.extend( defaultOptions, args[0] );

// Init select2 only if not already initialized to prevent select2 configuration loss.
					if ( typeof ($this.data( 'select2' )) !== 'object' ) {
						$this.select2();
					}

$this.each(
						function() {
							var $select         = $( this );
							var $select2choices = $select.siblings( '.select2-container' ).find( '.select2-selection__rendered' );

// Init jQuery UI Sortable.
							$select2choices.sortable( options.sortableOptions );

switch ( options.bindOrder ) {
								case 'sortableStop':
									// apply options ordering in sortstop event.
									$select2choices.on(
										"sortstop.select2sortable",
										function( event, ui ) {
											$select.select2SortableOrder();
										}
									);

$select.on(
										'select2:select',
										function( e ) {
											$( this ).select2SortableOrder();
										}
									);
									break;

default:
									// apply options ordering in form submit.
									$select.closest( 'form' ).off( 'submit.select2sortable' ).on(
										'submit.select2sortable',
										function() {
											$select.select2SortableOrder();
										}
									);
									break;
							}
						}
					);
				} else if ( typeof (args[0] === 'string') ) {
					if ( $.inArray( args[0], validMethods ) === - 1 ) {
						throw "Unknown method: " + args[0];
					}

if ( args[0] === 'destroy' ) {
						$this.select2SortableDestroy();
					}
				}

return $this;
			},

select2SortableDestroy: function() {
				var $this = this.filter( '[multiple]' );

$this.each(
					function() {
						var $select         = $( this );
						var $select2choices = $select.parent().find( '.select2-selection__rendered' );

// unbind form submit event.
						$select.closest( 'form' ).off( 'submit.select2sortable' );

// unbind sortstop event.
						$select2choices.off( "sortstop.select2sortable" );

// destroy select2Sortable.
						$select2choices.sortable( 'destroy' );
					}
				);

return $this;
			}
		}
	);
}( jQuery ));