$(function()
{
	$( ".auto-tags" )
		.bind( "keydown", function( event ) {
			if ( event.keyCode === $.ui.keyCode.TAB &&
					$( this ).data( "autocomplete" ).menu.active ) {
				event.preventDefault();
			}
		})
		.autocomplete({
			source: function( request, response ) {
				$.getJSON( "/addons/ajax/common.php", {
					term: extractLast( request.term ),
					task: 'getRelatedTags'
				}, response );
			},
			search: function() {
				var term = extractLast( this.value );
				if ( term.length < 3 ) {
					return false;
				}
			},
			focus: function() {
				return false;
			},
			select: function( event, ui ) {
				var terms = split( this.value );
				terms.pop();
				terms.push( ui.item.value );
				terms.push( "" );
				this.value = terms.join( ", " );
				return false;
			}
		});
	
})
function split( val ) {
	return val.split( /,\s*/ );
}
function extractLast( term ) {
	return split( term ).pop();
}