/*
* jQuery Mobile Framework : "listview" filter extension
* Copyright (c) jQuery Project
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*/

(function( $, undefined ) {

$.mobile.listview.prototype.options.filter = false;
$.mobile.listview.prototype.options.filterPlaceholder = "Filter items...";
$.mobile.listview.prototype.options.filterTheme = "c";
$.mobile.listview.prototype.options.filterCallback = function( text, searchValue ){
	return text.toLowerCase().indexOf( searchValue ) === -1;
};

$( ":jqmData(role='listview')" ).live( "listviewcreate", function() {

	var list = $( this ),
		listview = list.data( "listview" );

	if ( !listview.options.filter ) {
		return;
	}

	var wrapper = $( "<form>", {
			"class": "ui-listview-filter ui-bar-" + listview.options.filterTheme,
			"role": "search"
		}),
		search = $( "<input>", {
			placeholder: listview.options.filterPlaceholder
		})
		.attr( "data-" + $.mobile.ns + "type", "search" )
		.jqmData( "lastval", "" )
		.bind( "keyup change", function() {

			var $this = $(this),
				val = this.value.toLowerCase(),
				listItems = null,
				lastval = $this.jqmData( "lastval" ) + "",
				childItems = false,
				itemtext = "",
				item, change;

			// Change val as lastval for next execution
			$this.jqmData( "lastval" , val );

			change = val.replace( new RegExp( "^" + lastval ) , "" );

			if ( val.length < lastval.length || change.length != ( val.length - lastval.length ) ) {

				// Removed chars or pasted something totaly different, check all items
				listItems = list.children();
			} else {

				// Only chars added, not removed, only use visible subset
				listItems = list.children( ":not(.ui-screen-hidden)" );
			}

			if ( val ) {

				// This handles hiding regular rows without the text we search for
				// and any list dividers without regular rows shown under it

				for ( var i = listItems.length - 1; i >= 0; i-- ) {
					item = $( listItems[ i ] );
					itemtext = item.jqmData( "filtertext" ) || item.text();

					if ( item.is( "li:jqmData(role=list-divider)" ) ) {

						item.toggleClass( "ui-filter-hidequeue" , !childItems );

						// New bucket!
						childItems = false;

					} else if ( listview.options.filterCallback( itemtext, val ) ) {

						//mark to be hidden
						item.toggleClass( "ui-filter-hidequeue" , true );
					} else {

						// There"s a shown item in the bucket
						childItems = true;
					}
				}

				// Show items, not marked to be hidden
				listItems
					.filter( ":not(.ui-filter-hidequeue)" )
					.toggleClass( "ui-screen-hidden", false );

				// Hide items, marked to be hidden
				listItems
					.filter( ".ui-filter-hidequeue" )
					.toggleClass( "ui-screen-hidden", true )
					.toggleClass( "ui-filter-hidequeue", false );

			} else {

				//filtervalue is empty => show all
				listItems.toggleClass( "ui-screen-hidden", false );
			}
			listview._refreshCorners();
		})
		.appendTo( wrapper )
		.textinput();

	if ( $( this ).jqmData( "inset" ) ) {
		wrapper.addClass( "ui-listview-filter-inset" );
	}

	wrapper.bind( "submit", function() {
		return false;
	})
	.insertBefore( list );
});

})( jQuery );