/**
 * Inspired by http://jqueryui.com/demos/autocomplete/#multiple
 */

(function( $ ) {
	$.widget('ui.multiple_autocomplete', {
		_create: function() {
			function split( val ) {
				return val.split( /,\s*/ );
			}
			function extractLast( term ) {
				return split( term ).pop();
			}
			//console.log('_create: ' + this.options['id']);
			var self = this;
			this.element.bind( "keydown", function( event ) {
				if ( event.keyCode === $.ui.keyCode.TAB &&
						$( this ).data( "autocomplete" ).menu.active ) {
					event.preventDefault();
				}
			})
			.autocomplete({
				minLength: 0,
				source: function( request, response ) {
					// delegate back to autocomplete, but extract the last term
					response( $.ui.autocomplete.filter(
						self.options.source, extractLast( request.term ) ) );
				},
				focus: function() {
					// prevent value inserted on focus
					return false;
				},
				select: function( event, ui ) {
					var terms = split( this.value );
					// remove the current input
					terms.pop();
					// add the selected item
					terms.push( ui.item.value );
					// add placeholder to get the comma-and-space at the end
					terms.push( "" );
					this.value = terms.join( ", " );
					return false;
				}
			});
		},
	});
})( jQuery );