/****************************************************************************
Copyright (c) 2009 The Wojo Group

thewojogroup.com
simplecartjs.com
http://github.com/thewojogroup/simplecart-js/tree/master

The MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

var NextId=1,Custom="Custom",GoogleCheckout="GoogleCheckout",PayPal="PayPal",Email="Email",AustralianDollar=AUD="AUD",CanadianDollar=CAD="CAD",CzechKoruna=CZK="CZK",DanishKrone=DKK="DKK",Euro=EUR="EUR",HongKongDollar=HKD="HKD",HungarianForint=HUF="HUF",IsraeliNewSheqel=ILS="ILS",JapaneseYen=JPY="JPY",MexicanPeso=MXN="MXN",NorwegianKrone=NOK="NOK",NewZealandDollar=NZD="NZD",PolishZloty=PLN="PLN",PoundSterling=GBP="GBP",SingaporeDollar=SGD="SGD",SwedishKrona=SEK="SEK",SwissFranc=CHF="CHF",USDollar=USD="USD";
function Cart(){

	var me = this;
	/* member variables */
	me.Version = '2.0.1';
	me.Shelf = new Shelf();
	me.items = {};
	me.isLoaded = false;
	me.pageIsReady = false;
	me.quantity = 0;
	me.total = 0;
	me.taxRate = 0;
	me.taxCost = 0;
	me.shippingFlatRate = 0;
	me.shippingTotalRate = 0;
	me.shippingQuantityRate = 0;
	me.shippingRate = 0;
	me.shippingCost = 0;
	me.currency = USD;
	me.checkoutTo = PayPal;
	me.email = "";
	me.merchantId	 = "";
	me.cartHeaders = ['Name','Price','Quantity','Total'];
	/* 
		cart headers: 
		you can set these to which ever order you would like, and the cart will display the appropriate headers
		and item info.  any field you have for the items in the cart can be used, and 'Total' will automatically 
		be price*quantity.  
		
		there are keywords that can be used:
			
			1) "_input" - the field will be a text input with the value set to the given field. when the user
				changes the value, it will update the cart.  this can be useful for quantity. (ie "Quantity_input")
			
			2) "increment" - a link with "+" that will increase the item quantity by 1
			
			3) "decrement" - a link with "-" that will decrease the item quantity by 1
			
			4) "remove" - a link that will remove the item from the cart 
			
			5) "_image" or "Image" - the field will be an img tag with the src set to the value. You can simply use "Image" if
				you set a field in the items called "Image".  If you have a field named something else, like "Thumb", you can add
				the "_image" to create the image tag (ie "Thumb_image").
				
			6) "_noHeader" - this will skip the header for that field (ie "increment_noHeader")
		
	
	*/
	
	


	/******************************************************
			add/remove items to cart  
 	 ******************************************************/

	me.add = function () {
		var me=this;
		/* load cart values if not already loaded */
		if( !me.pageIsReady 	) { 
			me.initializeView(); 
			me.update();	
		}
		if( !me.isLoaded 		) { 
			me.load(); 
			me.update();	
		}
		
		var newItem = new CartItem();
		
		/* check to ensure arguments have been passed in */
		if( !arguments || arguments.length === 0 ){
			error( 'No values passed for item.');
			return;
		}
		var argumentArray = arguments;
		if( arguments[0] && typeof( arguments[0] ) != 'string' && typeof( arguments[0] ) != 'number'  ){ 
			argumentArray = arguments[0]; 
		} 
	
		newItem.parseValuesFromArray( argumentArray );
		newItem.checkQuantityAndPrice();
		
		/* if the item already exists, update the quantity */
		if( me.hasItem(newItem) ) {
			var id=me.hasItem(newItem);
			me.items[id].quantity= parseInt(me.items[id].quantity,10) + parseInt(newItem.quantity,10);
		} else {
			me.items[newItem.id] = newItem;
		}	
		
		me.update();
	};
	
	
	me.remove = function( id ){
		var tempArray = {};
		for( var item in this.items ){
			if( item != id ){ 
				tempArray[item] = this.items[item]; 
			}
		}
		this.items = tempArray;
	};
	
	me.empty = function () {
		simpleCart.items = {};
		simpleCart.update();
	};
	
	/******************************************************
			 item accessor functions
     ******************************************************/

	me.find = function (criteria) {
		if( !criteria )
			return null;
		var results = [];
		for( var next in me.items ){
			var item = me.items[next],
				fits = true;
			for( var name in criteria ){
				if( !item[name] || item[name] != criteria[name] )
					fits = false;
			}
			if( fits )
				results.push( me.next )
		}
		return (results.length == 0 ) ? null : results;
	}

	/******************************************************
			 checkout management 
     ******************************************************/

	me.checkout = function() {
		if( simpleCart.quantity === 0 ){
			/* DK:  added simple alert */
			// error("Cart is empty");
			alert("Cart is empty");
			return;
		}
		switch( simpleCart.checkoutTo ){
			case PayPal:
				simpleCart.paypalCheckout();
				break;
			case GoogleCheckout:
				simpleCart.googleCheckout();
				break;
			case Email:
				simpleCart.emailCheckout();
				break;
			default:
				simpleCart.customCheckout();
				break;
		}
	};
	
	me.paypalCheckout = function() {
		
		var me = this,
			winpar = "scrollbars,location,resizable,status",
			strn  = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart" +
		   			"&upload=1" +
		        	"&business=" + me.email + 
					"&currency_code=" + me.currency,
			counter = 1,
			itemsString = "";
			
		
		if( me.taxRate ){
			strn = strn + 
				"&tax_cart=" +  me.currencyStringForPaypalCheckout( me.taxCost );
		}
		
		for( var current in me.items ){
			var item = me.items[current];
			
			var optionsString = "";
			for( var field in item ){
				if( typeof(item[field]) != "function" && field != "id" && field != "price" && field != "quantity" && field != "name" && field != "shipping") {
					optionsString = optionsString + ", " + field + "=" + item[field] ; 
				}
			}
			optionsString = optionsString.substring(2);
			
			itemsString = itemsString 	+ "&item_name_" 	+ counter + "=" + item.name  +
									 	  "&item_number_" 	+ counter + "=" + counter +
										  "&quantity_"		+ counter + "=" + item.quantity +
										  "&amount_"		+ counter + "=" + me.currencyStringForPaypalCheckout( item.price ) + 
										  "&on0_" 			+ counter + "=" + "Options" + 
										  "&os0_"			+ counter + "=" + optionsString;
			counter++;
		}
		
		if( me.shipping() != 0){
			 itemsString = itemsString 	+ "&item_name_" 	+ counter + "=Shipping"  +
									 	  "&item_number_" 	+ counter + "=" + counter +
										  "&quantity_"		+ counter + "=1" + 
										  "&amount_"		+ counter + "=" + me.currencyStringForPaypalCheckout( me.shippingCost );
		}
		
		
		strn = strn + itemsString ;
		window.open (strn, "paypal", winpar);
	};

	me.googleCheckout = function() {
		var me = this;
		if( me.currency != USD && me.currency != GBP ){
			error( "Google Checkout only allows the USD and GBP for currency.");
			return;
		} else if( me.merchantId === "" || me.merchantId === null || !me.merchantId ){
			error( "No merchant Id for google checkout supplied.");
			return;
		} 

		if(ie6) {
			/* DK:  manual form submit for IE6 bug */
			counter = 1;
			var hidden_vals = '';
		} else {
			var form = document.createElement("form"),
				counter = 1;
			form.style.display = "none";
			form.method = "POST";
			form.action = "https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/" + me.merchantId;
			form.acceptCharset = "utf-8";
		}

		for( var current in me.items ){
			var item = me.items[current];
			if (!ie6) {
				/* DK:  regular hidden form submit */
				form.appendChild( me.createHiddenElement("item_name_" + counter, item.name) );
				form.appendChild( me.createHiddenElement("item_quantity_" + counter, item.quantity) );
				form.appendChild( me.createHiddenElement("item_price_" + counter, item.price) );
				form.appendChild( me.createHiddenElement("item_currency_" + counter, me.currency) );
				form.appendChild( me.createHiddenElement("item_tax_rate_" + counter, me.taxRate) );
				form.appendChild( me.createHiddenElement("_charset_", "") );
			}

//			var descriptionString = "";
			var descriptionString = " ip: " + ip;	/* DK:  added ip address to description string; always the first item listed */

			for( var field in item){
				/* DK:  switched to only placing Description in the string. */
				if( typeof( item[field] ) != "function"	&& field == "description"){
				/* DK:  added 'image', 'thumb', and 'name' to fields excluded from being sent to Google Checkout as part of description. */
//				if( typeof( item[field] ) != "function" && 
//									field != "id" 		&& 
//									field != "quantity"	&& 
//									field != "image"	&& 
//									field != "thumb"	&& 
//									field != "name"	&& 
//									field != "price" )
//				{
						descriptionString = descriptionString + ", " + field + ": " + item[field];				
				}
			}
			descriptionString = descriptionString.substring( 1 );
			if (ie6) {
				/* DK:  manual form submit for IE6 bug */
				hidden_vals = hidden_vals + '<input type="hidden" name="item_name_' + counter + '" value="' + item.name + '">' + '<input type="hidden" name="item_quantity_' + counter + '" value="' + item.quantity + '">' + '<input type="hidden" name="item_price_' + counter + '" value="' + item.price + '">' + '<input type="hidden" name="item_currency_' + counter + '" value="' + me.currency + '">' + '<input type="hidden" name="item_tax_rate_' + counter + '" value="' + me.taxRate + '">'+ '<input type="hidden" name="item_description_' + counter + '" value="' + descriptionString + '">';
			} else {
				form.appendChild( me.createHiddenElement( "item_description_" + counter, descriptionString) );
			}

			counter++;
		}

		if (ie6) {
			/* DK:  manual form submit for IE6 bug */
			/* unfortunately, this will get triggered a second time by the bottom checkout button... */
			alert('IE6 users, please click on the "Submit" button to continue.');

			// place a submit button somewhere on the page
			// hidden_vals = hidden_vals + '<input type="submit" value="Submit">';

			// override the google checkout button with a manual submit button so user doesn't have to hunt for it on page...
			document.getElementById('checkout_button').innerHTML = '<input type="submit" value="Submit">';

			document.getElementById('form_hidden_fields').innerHTML = hidden_vals;
		} else {
			document.body.appendChild( form );
			form.submit();
			document.body.removeChild( form );
		}
	};
	
	
	
	me.emailCheckout = function() {
		return;
	};
	
	me.customCheckout = function() {
		return;
	};




	/******************************************************
				data storage and retrival 
	 ******************************************************/
	
	/* load cart from cookie */
	me.load = function () {
		var me = this;
		/* initialize variables and items array */
		me.items = {};
		me.total = 0.00;
		me.quantity = 0;
		
		/* retrieve item data from cookie */
		if( readCookie('simpleCart') ){
			var data = unescape(readCookie('simpleCart')).split('++');
			for(var x=0, xlen=data.length;x<xlen;x++){
			
				var info = data[x].split('||');
				var newItem = new CartItem();
			
				if( newItem.parseValuesFromArray( info ) ){
					newItem.checkQuantityAndPrice();
					/* store the new item in the cart */
					me.items[newItem.id] = newItem;
				}
 			}
		}
		me.isLoaded = true;
	};
	
	
	
	/* save cart to cookie */
	me.save = function () {
		var dataString = "";
		for( var item in this.items ){
			dataString = dataString + "++" + this.items[item].print();
		}
		createCookie('simpleCart', dataString.substring( 2 ), 30 );
	};
	
	

	
		
	/******************************************************
				 view management 
	 ******************************************************/
	
	me.initializeView = function() {
		var me = this;
		me.totalOutlets 			= getElementsByClassName('simpleCart_total');
		me.quantityOutlets 			= getElementsByClassName('simpleCart_quantity');
		me.cartDivs 				= getElementsByClassName('simpleCart_items');
		me.taxCostOutlets			= getElementsByClassName('simpleCart_taxCost');
		me.taxRateOutlets			= getElementsByClassName('simpleCart_taxRate');
		me.shippingCostOutlets		= getElementsByClassName('simpleCart_shippingCost');
		me.finalTotalOutlets		= getElementsByClassName('simpleCart_finalTotal');
		
		me.addEventToArray( getElementsByClassName('simpleCart_checkout') , simpleCart.checkout , "click");
		me.addEventToArray( getElementsByClassName('simpleCart_empty') 	, simpleCart.empty , "click" );

		/* DK:  added 2nd instance for top checkout button with modified positioning */
		/* me.addEventToArray( getElementsByClassName('simpleCart_empty_top') 	, simpleCart.empty , "click" ); */
		
		me.Shelf.readPage();
			
		me.pageIsReady = true;
		
	};
	
	
	
	me.updateView = function() {
		me.updateViewTotals();
		if( me.cartDivs && me.cartDivs.length > 0 ){ 
			me.updateCartView(); 
		}
	};
	
	me.updateViewTotals = function() {
		var outlets = [ ["quantity"		, "none"		] , 
						["total"		, "currency"	] , 
						["shippingCost"	, "currency"	] ,
						["taxCost"		, "currency"	] ,
						["taxRate"		, "percentage"	] ,
						["finalTotal"	, "currency"	] ];
						
		for( var x=0,xlen=outlets.length; x<xlen;x++){
			
			var arrayName = outlets[x][0] + "Outlets",
				outputString;
				
			for( var element in me[ arrayName ] ){
				switch( outlets[x][1] ){
					case "none":
						outputString = "" + me[outlets[x][0]];
						break;
					case "currency":
						outputString = me.valueToCurrencyString( me[outlets[x][0]] );
						break;
					case "percentage":
						outputString = me.valueToPercentageString( me[outlets[x][0]] );
						break;
					default:
						outputString = "" + me[outlets[x][0]];
						break;
				}
				me[arrayName][element].innerHTML = "" + outputString;
			}
		}
	};
	
	me.updateCartView = function() {
		var newRows = [],
			x,newRow,item,current,header,newCell,info,outputValue,option,headerInfo;
		
		/* create headers row */
		newRow = document.createElement('div');
		for( header in me.cartHeaders ){
			newCell = document.createElement('div');
			headerInfo = me.cartHeaders[header].split("_");
			
			newCell.innerHTML = headerInfo[0];
			newCell.className = "item" + headerInfo[0];
			for(x=1,xlen=headerInfo.length;x<xlen;x++){
				if( headerInfo[x].toLowerCase() == "noheader" ){
					newCell.style.display = "none";
				}
			}
			newRow.appendChild( newCell );
			
		}
		newRow.className = "cartHeaders";
		newRows[0] = newRow;
		
		/* create a row for each item in the cart */
		x=1;
		for( current in me.items ){
			newRow = document.createElement('div');
			item = me.items[current];
			
			for( header in me.cartHeaders ){
				
				newCell = document.createElement('div');
				info = me.cartHeaders[header].split("_");
				
				switch( info[0].toLowerCase() ){
					case "total":
						outputValue = me.valueToCurrencyString(parseFloat(item.price)*parseInt(item.quantity,10) );
						break;
					case "increment":
						outputValue = me.valueToLink( "+" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].increment();\"" );
						break;
					case "decrement":
						outputValue = me.valueToLink( "-" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].decrement();\"" );
						break;
					case "remove":
						outputValue = me.valueToLink( "Remove" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].remove();\"" );
						break;
					case "price":
						outputValue = me.valueToCurrencyString( item[ info[0].toLowerCase() ] ? item[info[0].toLowerCase()] : " " );
						break;
					default: 
						outputValue = item[ info[0].toLowerCase() ] ? item[info[0].toLowerCase()] : " ";
						break;
				}	
				
				for( var y=1,ylen=info.length;y<ylen;y++){
					option = info[y].toLowerCase();
					switch( option ){
						case "image":
						case "img":
							outputValue = me.valueToImageString( outputValue );		
							break;
						case "input":
							outputValue = me.valueToTextInput( outputValue , "onchange=\"simpleCart.items[\'" + item.id + "\'].set(\'" + outputValue + "\' , this.value);\""  );
							break;
						case "div":
						case "span":
						case "h1":
						case "h2":
						case "h3":
						case "h4":
						case "p":
							outputValue = me.valueToElement( option , outputValue , "" );
							break;
						case "noheader":
							break;
						default:
							error( "unkown header option: " + option );
							break;
					}
				
				}		  
				newCell.innerHTML = outputValue;
				newCell.className = "item" + info[0];
				newRow.appendChild( newCell );
			}			
			newRow.className = "itemContainer";
			newRows[x] = newRow;
			x++;
		}
		
		
		
		for( current in me.cartDivs ){
			
			/* delete current rows in div */
			var div = me.cartDivs[current];
			while( div.childNodes[0] ){
				div.removeChild( div.childNodes[0] );
			}
			
			for(var j=0, jLen = newRows.length; j<jLen; j++){
				div.appendChild( newRows[j] );
			}
			
			
		}
	};

	me.addEventToArray = function ( array , functionCall , theEvent ) {
		for( var outlet in array ){
			var element = array[outlet];
			if( element.addEventListener ) {
				element.addEventListener(theEvent, functionCall , false );
			} else if( element.attachEvent ) {
			  	element.attachEvent( "on" + theEvent, functionCall );
			}
		}
	};
	
	
	me.createHiddenElement = function ( name , value ){
		/* DK:  IE6/7 doesn't support setting 'name' attribute after creating element ... http://forum.lowyat.net/topic/476351 */
		var element = null;
		try 
		{
		   element = document.createElement('<input name="'+name+'">');
		} catch( e ) {};

		if( !element || element.name.toLowerCase() != name.toLowerCase() ) {
		   element = document.createElement('input');
		   element.name = name;
		};  

//		var element = document.createElement("input");
		element.type = "hidden";
//		element.name = name;
		element.value = value;
		return element;
	};
	
	
	
	/******************************************************
				Currency management
	 ******************************************************/
	
	me.currencySymbol = function() {		
		switch(me.currency){
			case JPY:
				return "&yen;";
			case EUR:
				return "&euro;";
			case GBP:
				return "&pound;";
			case USD:
			case CAD:
			case AUD:
			case NZD:
			case HKD:
			case SGD:
				return "&#36;";
			default:
				return "";
		}
	};
	
	
	me.currencyStringForPaypalCheckout = function( value ){
		if( me.currencySymbol() == "&#36;" ){
			return "$" + parseFloat( value ).toFixed(2);
		} else {
			return "" + parseFloat(value ).toFixed(2);
		}
	};
	
	/******************************************************
				Formatting
	 ******************************************************/
	
	
	me.valueToCurrencyString = function( value ) {
		return parseFloat( value ).toCurrency( me.currencySymbol() );
	};
	
	me.valueToPercentageString = function( value ){
		return parseFloat( 100*value ) + "%";
	};
	
	me.valueToImageString = function( value ){
		if( value.match(/<\s*img.*src\=/) ){
			return value;
		} else {
			return "<img src=\"" + value + "\" />";
		}
	};
	
	me.valueToTextInput = function( value , html ){
		return "<input type=\"text\" value=\"" + value + "\" " + html + " />";
	};
	
	me.valueToLink = function( value, link, html){
		return "<a href=\"" + link + "\" " + html + " >" + value + "</a>";
	};
	
	me.valueToElement = function( type , value , html ){
		return "<" + type + " " + html + " > " + value + "</" + type + ">";
	};
	
	/******************************************************
				Duplicate management
	 ******************************************************/
	
	me.hasItem = function ( item ) {
		for( var current in me.items ) {
			var testItem = me.items[current];
			var matches = true;
			for( var field in item ){
				/* DK:  would make sense to check just name/price for dupes so as to treat items pre-loaded by $pid as the same... */
				if( typeof( item[field] ) != "function"	&& (field == "name" || field == "price")){
//				if( typeof( item[field] ) != "function"	&& 
//					field != "quantity"  				&& 
//					field != "id" 						){
					if( item[field] != testItem[field] ){
						matches = false;
					}
				}	
			}
			if( matches ){ 
				return current; 
			}
		}
		return false;
	};
	
	
	
	
	/******************************************************
				Cart Update managment
	 ******************************************************/
	
	me.update = function() {
		if( !simpleCart.isLoaded ){
			simpleCart.load();
		} 
		if( !simpleCart.pageIsReady ){
			simpleCart.initializeView();
		}
		me.updateTotals();
		me.updateView();
		me.save();
	};
	
	me.updateTotals = function() {
		me.total = 0 ;
		me.quantity  = 0;
		for( var current in me.items ){
			var item = me.items[current];
			if( item.quantity < 1 ){ 
				item.remove();
			} else if( item.quantity !== null && item.quantity != "undefined" ){
				me.quantity = parseInt(me.quantity,10) + parseInt(item.quantity,10); 
			}
			if( item.price ){ 
				me.total = parseFloat(me.total) + parseInt(item.quantity,10)*parseFloat(item.price); 
			}
		}
		me.shippingCost = me.shipping();
		me.taxCost = parseFloat(me.total)*me.taxRate;
		me.finalTotal = me.shippingCost + me.taxCost + me.total;
	};
	
	me.shipping = function(){
		if( parseInt(me.quantity,10)===0 )
			return 0;
		var shipping = 	parseFloat(me.shippingFlatRate) + 
					  	parseFloat(me.shippingTotalRate)*parseFloat(me.total) +
						parseFloat(me.shippingQuantityRate)*parseInt(me.quantity,10),
			nextItem,
			next;
		for(next in me.items){
			nextItem = me.items[next];
			if( nextItem.shipping ){
				if( typeof nextItem.shipping == 'function' ){
					shipping += parseFloat(nextItem.shipping());
				} else {
					shipping += parseFloat(nextItem.shipping);
				}
			}
		}
		
		return shipping;
	}
	
	me.initialize = function() {
		simpleCart.initializeView();
		simpleCart.load();
		simpleCart.update();
	};
				
}

/********************************************************************************************************
 *			Cart Item Object
 ********************************************************************************************************/

function CartItem() {
	this.id = "c" + NextId++;
}
	CartItem.prototype.set = function ( field , value ){
		field = field.toLowerCase();
		if( typeof( this[field] ) != "function" && field != "id" ){
			if( field == "quantity" ){
				value = value.replace( /[^(\d|\.)]*/gi , "" );
				value = value.replace(/,*/gi, "");
				value = parseInt(value,10);
			} else if( field == "price"){
				value = value.replace( /[^(\d|\.)]*/gi, "");
				value = value.replace(/,*/gi , "");
				value = parseFloat( value );
			}
			if( typeof(value) == "number" && isNaN( value ) ){
				error( "Improperly formatted input.");
			} else {
				this[field] = value;
				this.checkQuantityAndPrice();
			}			
		} else {
			error( "Cannot change " + field + ", this is a reserved field.");
		}
		simpleCart.update();
	};
	
	CartItem.prototype.increment = function(){
		this.quantity = parseInt(this.quantity,10) + 1;
		simpleCart.update();
	};
	
	CartItem.prototype.decrement = function(){
		if( parseInt(this.quantity,10) < 2 ){
			this.remove();
		} else {
			this.quantity = parseInt(this.quantity,10) - 1;
			simpleCart.update();
		}
	};
	
	CartItem.prototype.print = function () {
		var returnString = '';
		for( var field in this ) {
			if( typeof( this[field] ) != "function" ) {
				returnString+= escape(field) + "=" + escape(this[field]) + "||";
			}
		}
		return returnString.substring(0,returnString.length-2);
	};
	
	
	CartItem.prototype.checkQuantityAndPrice = function() {
		if( !this.price || this.quantity == null || this.quantity == 'undefined'){ 
			this.quantity = 1;
			error('No quantity for item.');
		} else {
			this.quantity = ("" + this.quantity).replace(/,*/gi, "" );
			this.quantity = parseInt( ("" + this.quantity).replace( /[^(\d|\.)]*/gi, "") , 10); 
			if( isNaN(this.quantity) ){
				error('Quantity is not a number.');
				this.quantity = 1;
			}
		}
				
		if( !this.price || this.price == null || this.price == 'undefined'){
			this.price=0.00;
			error('No price for item or price not properly formatted.');
		} else {
			this.price = ("" + this.price).replace(/,*/gi, "" );
			this.price = parseFloat( ("" + this.price).replace( /[^(\d|\.)]*/gi, "") ); 
			if( isNaN(this.price) ){
				error('Price is not a number.');
				this.price = 0.00;
			}
		}
	};
	
	
	CartItem.prototype.parseValuesFromArray = function( array ) {
		if( array && array.length && array.length > 0) {
			for(var x=0, xlen=array.length; x<xlen;x++ ){
			
				/* ensure the pair does not have key delimeters */
				array[x].replace(/||/, "| |");
				array[x].replace(/\+\+/, "+ +");
			
				/* split the pair and save the unescaped values to the item */
				var value = array[x].split('=');
				if( value.length>1 ){
					if( value.length>2 ){
						for(var j=2, jlen=value.length;j<jlen;j++){
							value[1] = value[1] + "=" + value[j];
						}
					}
					this[ unescape(value[0]).toLowerCase() ] = unescape(value[1]);
				}
			}
			return true;
		} else {
			return false;
		}
	};
	
	CartItem.prototype.remove = function() {
		simpleCart.remove(this.id);
		simpleCart.update();
	};
	


/********************************************************************************************************
 *			Shelf Object for managing items on shelf that can be added to cart
 ********************************************************************************************************/

function Shelf(){
	this.items = {};
}	
	Shelf.prototype.readPage = function () {
		this.items = {};
		var newItems = getElementsByClassName( "simpleCart_shelfItem" );
		for( var current in newItems ){
			var newItem = new ShelfItem();
			this.checkChildren( newItems[current] , newItem );
			this.items[newItem.id] = newItem;
		}
	};
	
	Shelf.prototype.checkChildren = function ( item , newItem) {
		
		for(var x=0;item.childNodes[x];x++){
			
			var node = item.childNodes[x];
			if( node.className && node.className.match(/item_[^ ]+/) ){
				
				var data = /item_[^ ]+/.exec(node.className)[0].split("_");
				
				if( data[1] == "add" || data[1] == "Add" ){
					var tempArray = [];
					tempArray.push( node );
					var addFunction = simpleCart.Shelf.addToCart(newItem.id);
					simpleCart.addEventToArray( tempArray , addFunction , "click");
					node.id = newItem.id;
				} else {
					newItem[data[1]]  = node;
				}
			}		
			if( node.childNodes[0] ){ 
				this.checkChildren( node , newItem );	
			}	
		}
	};
	
	Shelf.prototype.empty = function () {
		this.items = {};
	};
	
	
	Shelf.prototype.addToCart = function ( id ) {
		return function(){
			if( simpleCart.Shelf.items[id]){
				simpleCart.Shelf.items[id].addToCart();
			} else {
				/* DK:  this gets triggered on live setup when error() uncommented; but items still get added to cart... */
				error( "Shelf item with id of " + id + " does not exist.");
			}
		};
	};
	

/********************************************************************************************************
 *			Shelf Item Object
 ********************************************************************************************************/


function ShelfItem(){
	this.id = "s" + NextId++;
}	
	ShelfItem.prototype.remove = function () {
		simpleCart.Shelf.items[this.id] = null;
	};
	
	
	ShelfItem.prototype.addToCart = function () {
		var outStrings = [],valueString;
		for( var field in this ){
			if( typeof( this[field] ) != "function" && field != "id" ){
				valueString = "";
				
				switch(field){
					case "price":
						if( this[field].value ){
							valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							valueString = this[field].innerHTML;
						}
						/* remove all characters from price except digits and a period */
						valueString = valueString.replace( /[^(\d|\.)]*/gi , "" );
						valueString = valueString.replace( /,*/ , "" );
						break;
					case "image":
						valueString = this[field].src;
						break;
					default:
						if( this[field].value ){
							valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							valueString = this[field].innerHTML;
						} else if( this[field].src ){
							valueString = this[field].src;
						} else {
							valueString = this[field];
						}
						break;
				}
				outStrings.push( field + "=" + valueString );
			}
		}
		
		simpleCart.add( outStrings );
	};
	


/********************************************************************************************************
 * Thanks to Peter-Paul Koch for these cookie functions (http://www.quirksmode.org/js/cookies.html)
 ********************************************************************************************************/
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}


//*************************************************************************************************
/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/	
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};


/********************************************************************************************************
 *  Helpers
 ********************************************************************************************************/


String.prototype.reverse=function(){return this.split("").reverse().join("");};
Number.prototype.withCommas=function(){var x=6,y=parseFloat(this).toFixed(2).toString().reverse();while(x<y.length){y=y.substring(0,x)+","+y.substring(x);x+=4;}return y.reverse();};
Number.prototype.toCurrency=function(){return(arguments[0]?arguments[0]:"$")+this.withCommas();};


/********************************************************************************************************
 * error management 
 ********************************************************************************************************/

function error( message ){
	try{ 
		console.log( message ); 
	}catch(err){ 
		// alert( message );	/* DK: unncommented; was silencing some errors/warnings... */
	}
}


var simpleCart = new Cart();

if( typeof jQuery !== 'undefined' ) $(document).ready(function(){simpleCart.initialize();}); 
else if( typeof Prototype !== 'undefined') Event.observe( window, 'load', function(){simpleCart.initialize();});
else window.onload = simpleCart.initialize;