webshims.register('form-datalist', function($, webshims, window, document, undefined, options){
	"use strict";
	var doc = document;
	var lazyLoad = function(name){
		if(!name || typeof name != 'string'){
			name = 'DOM';
		}
		if(!lazyLoad[name+'Loaded']){
			lazyLoad[name+'Loaded'] = true;
			webshims.ready(name, function(){
				webshims.loader.loadList(['form-datalist-lazy']);
			});
		}
	};
	var noDatalistSupport = {
		submit: 1,
		button: 1,
		reset: 1, 
		hidden: 1,
		
		range: 1,
		date: 1,
		month: 1
	};
	if(webshims.modules["form-number-date-ui"].loaded){
		$.extend(noDatalistSupport, {
			number: 1,
			time: 1
		});
	}
	

	/*
	 * implement propType "element" currently only used for list-attribute (will be moved to dom-extend, if needed)
	 */
	webshims.propTypes.element = function(descs){
		webshims.createPropDefault(descs, 'attr');
		if(descs.prop){return;}
		descs.prop = {
			get: function(){
				var elem = $.attr(this, 'list');
				if(elem){
					elem = document.getElementById(elem);
					if(elem && descs.propNodeName && !$.nodeName(elem, descs.propNodeName)){
						elem = null;
					}
				}
				return elem || null;
			},
			writeable: false
		};
	};
	
	
	/*
	 * Implements datalist element and list attribute
	 */
	
	(function(){
		var formsCFG = $.webshims.cfg.forms;
		var listSupport = Modernizr.input.list;
		if(listSupport && !formsCFG.customDatalist){return;}
		
			var initializeDatalist =  function(){
				
				
			var inputListProto = {
				//override autocomplete
				autocomplete: {
					attr: {
						get: function(){
							var elem = this;
							var data = $.data(elem, 'datalistWidget');
							if(data){
								return data._autocomplete;
							}
							return ('autocomplete' in elem) ? elem.autocomplete : elem.getAttribute('autocomplete');
						},
						set: function(value){
							var elem = this;
							var data = $.data(elem, 'datalistWidget');
							if(data){
								data._autocomplete = value;
								if(value == 'off'){
									data.hideList();
								}
							} else {
								if('autocomplete' in elem){
									elem.autocomplete = value;
								} else {
									elem.setAttribute('autocomplete', value);
								}
							}
						}
					}
				}
			};
			
			if(formsCFG.customDatalist && (!listSupport || !('selectedOption' in $('<input />')[0]))){
				//currently not supported x-browser (FF4 has not implemented and is not polyfilled )
				inputListProto.selectedOption = {
					prop: {
						writeable: false,
						get: function(){
							var elem = this;
							var list = $.prop(elem, 'list');
							var ret = null;
							var value, options;
							if(!list){return ret;}
							value = $.prop(elem, 'value');
							if(!value){return ret;}
							options = $.prop(list, 'options');
							if(!options.length){return ret;}
							$.each(options, function(i, option){
								if(value == $.prop(option, 'value')){
									ret = option;
									return false;
								}
							});
							return ret;
						}
					}
				};
			}
			
			
			if(listSupport){
				//options only return options, if option-elements are rooted: but this makes this part of HTML5 less backwards compatible
				if(!($('<datalist><select><option></option></select></datalist>').prop('options') || []).length ){
					webshims.defineNodeNameProperty('datalist', 'options', {
						prop: {
							writeable: false,
							get: function(){
								var options = this.options || [];
								if(!options.length){
									var elem = this;
									var select = $('select', elem);
									if(select[0] && select[0].options && select[0].options.length){
										options = select[0].options;
									}
								}
								return options;
							}
						}
					});
				}
				inputListProto.list = {
					attr: {
						get: function(){
							var val = webshims.contentAttr(this, 'list');
							if(val != null){
								$.data(this, 'datalistListAttr', val);
								if(!noDatalistSupport[$.prop(this, 'type')] && !noDatalistSupport[$.attr(this, 'type')]){
									this.removeAttribute('list');
								}
							} else {
								val = $.data(this, 'datalistListAttr');
							}
							
							return (val == null) ? undefined : val;
						},
						set: function(value){
							var elem = this;
							$.data(elem, 'datalistListAttr', value);
							if (!noDatalistSupport[$.prop(this, 'type')] && !noDatalistSupport[$.attr(this, 'type')]) {
								webshims.objectCreate(shadowListProto, undefined, {
									input: elem,
									id: value,
									datalist: $.prop(elem, 'list')
								});
							} else {
								elem.setAttribute('list', value);
							}
							$(elem).triggerHandler('listdatalistchange');
						}
					},
					initAttr: true,
					reflect: true,
					propType: 'element',
					propNodeName: 'datalist'
				};
			}
			
			webshims.defineNodeNameProperties('input', inputListProto);
			
			webshims.addReady(function(context, contextElem){
				contextElem
					.filter('datalist > select, datalist, datalist > option, datalist > select > option')
					.closest('datalist')
					.each(function(){
						$(this).triggerHandler('updateDatalist');
					})
				;
			});
		};
		
		
		/*
		 * ShadowList
		 */
		
		var shadowListProto = {
			_create: function(opts){
				
				if(noDatalistSupport[$.prop(opts.input, 'type')] || noDatalistSupport[$.attr(opts.input, 'type')]){return;}
				var datalist = opts.datalist;
				var data = $.data(opts.input, 'datalistWidget');
				var that = this;
				if(datalist && data && data.datalist !== datalist){
					data.datalist = datalist;
					data.id = opts.id;
					
					
					$(data.datalist)
						.off('updateDatalist.datalistWidget')
						.on('updateDatalist.datalistWidget', $.proxy(data, '_resetListCached'))
					;
					
					data._resetListCached();
					return;
				} else if(!datalist){
					if(data){
						data.destroy();
					}
					return;
				} else if(data && data.datalist === datalist){
					return;
				}
				
				
				
				this.datalist = datalist;
				this.id = opts.id;
				this.hasViewableData = true;
				this._autocomplete = $.attr(opts.input, 'autocomplete');
				$.data(opts.input, 'datalistWidget', this);
				
				lazyLoad('WINDOWLOAD');
				
				if(webshims.isReady('form-datalist-lazy')){
					this._lazyCreate(opts);
				} else {
					$(opts.input).one('focus', lazyLoad);
					webshims.ready('form-datalist-lazy', function(){
						if(!that._destroyed){
							that._lazyCreate(opts);
						}
					});
				}
			},
			destroy: function(e){
				var input;
				var autocomplete = $.attr(this.input, 'autocomplete');
				$(this.input)
					.off('.datalistWidget')
					.removeData('datalistWidget')
				;
				this.shadowList.remove();
				$(document).off('.datalist'+this.id);
				$(window).off('.datalist'+this.id);
				if(this.input.form && this.input.id){
					$(this.input.form).off('submit.datalistWidget'+this.input.id);
				}
				this.input.removeAttribute('aria-haspopup');
				if(autocomplete === undefined){
					this.input.removeAttribute('autocomplete');
				} else {
					$(this.input).attr('autocomplete', autocomplete);
				}
				if(e && e.type == 'beforeunload'){
					input = this.input;
					setTimeout(function(){
						$.attr(input, 'list', $.attr(input, 'list'));
					}, 9);
				}
				this._destroyed = true;
			}
		};
		
		webshims.loader.addModule('form-datalist-lazy', {
			noAutoCallback: true,
			options: $.extend(options, {shadowListProto: shadowListProto})
		});
		
		//init datalist update
		initializeDatalist();
	})();
	
});