// get control when page loads
if (window.addEventListener) {
	window.addEventListener('load', fAddOnChange, false);
} else if (window.attachEvent) {
	window.attachEvent('onload', fAddOnChange);
}

function fAddOnChange(e){
	if(document.addtocart != null){
		var oACF = document.addtocart.elements;
		for (i=0; i < oACF.length; i++) {
			if( oACF[i].type.toLowerCase().indexOf("select") != -1 ){
            	if(oACF[i].name.indexOf('prod_id') == -1){
                    if (oACF[i].addEventListener) {
                        oACF[i].addEventListener('change', fModVirtuemartAjax, false);
                    } else if (oACF[i].attachEvent) {
                        oACF[i].attachEvent('onchange', fModVirtuemartAjax );
                    }
                }else{
                   if (oACF[i].addEventListener) {
                        oACF[i].addEventListener('change', fModVirtuemartAjaxItemChange, false);
                    } else if (oACF[i].attachEvent) {
                        oACF[i].attachEvent('onchange', fModVirtuemartAjaxItemChange );
                    }
                }
				for(k=0; k < oACF[i].options.length; k++){
                	vOptionName = oACF[i].options[k].text;
                	if(vOptionName.indexOf('(') != -1){
                    	oACF[i].options[k].text = vOptionName.substr(0, vOptionName.indexOf('(')-1);
                    }
                }                
			}
		}
		fModVirtuemartAjax(e);
	}
}

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == '*' && document.all) ? document.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i< arrElements.length; i++){
        oElement = arrElements[i];
        if( oRegExp.test(oElement.getAttribute("class")) || oRegExp.test(oElement.className) ){
            arrReturnElements.push(oElement);
        }
    }
    return (arrReturnElements)
}

function fModVirtuemartAjax(e){
	var target = document.addtocart; //window.event ? window.event.srcElement : e ? e.target : null;
    var vWaitMessage = '<span>Getting price...</span>';

	if (!target) return;	
	if (target.ajaxInProgress) return;	
	if(window.XMLHttpRequest && !(window.ActiveXObject)) {
		try {
			var xmlhttp = new XMLHttpRequest();
		} catch(e) {
			var xmlhttp = false;
		}
	} else if(window.ActiveXObject) {
		try {
			var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch(e) {
			try {
				var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch(e) {
				var xmlhttp = false;
			}
		}
	}
	xmlhttp.open('POST', '/index.php?option=com_virtuemart&page=shop.product_price', true);
	
	/* The callback function */
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4) {
			if (xmlhttp.status == 200 || xmlhttp.status == 404){
				fModVirtuemartAjaxUpdate(xmlhttp.responseXML, target);
            }else{
				target.submit();
			}
		}
	}
	
	
	/* Send the POST request */		
	vDesc = "";
	vBanned = new Array("page", "flypage", "func", "Itemid", "category_id", "option", "Add to Cart", '', ' ');
	for(i= 0; i < target.elements.length; i++){
		vOK = true;
		for(k=0; k < vBanned.length; k++){
			vOK = (vBanned[k] == target.elements[i].name) ? false : vOK;
		}
		if(vOK){
			if( target.elements[i].type.indexOf('select') != -1 ){
				if(target.elements[i].name != null){
					vDesc += target.elements[i].name + '=' + target.elements[i].options[target.elements[i].selectedIndex].value + "&";
					//xmlhttp.send(target.elements[i].name + '=' + target.elements[i].options[target.elements[i].selectedIndex].value);
				}
			}else{
				if(target.elements[i].name != null){
					vDesc += target.elements[i].name + '=' + target.elements[i].value + "&";
					//xmlhttp.send(target.elements[i].name + '=' + target.elements[i].value);
				}
			}
		}
	}
	
	/* Add temporary feedback that the request has been sent */
    if(document.getElementById('ajaxpprice') != null && 'ajaxpprice' != ''){
    	oPCID = document.getElementById('ajaxpprice');
        oPCID.innerHTML = vWaitMessage
    }
    if('productPrice' != ''){
    	vPCClassArray = getElementsByClassName(document, '*', 'productPrice');
        for(i=0; i < vPCClassArray.length;i++){
        	vPCClassArray[i].innerHTML = vWaitMessage;
        }
    }
	xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xmlhttp.send(vDesc);
	//target.ajaxInProgress = true;
}

function fModVirtuemartAjaxUpdate(responseXML, target) {
	vPriceMessage = '{ERROR}';
	if (responseXML != null) {
    	vTree = responseXML.getElementsByTagName('xmlresponse')[0].childNodes;
        //responseXML.getElementsByTagName('price')[0].firstChild.data
        if(vTree.length > 0){
            for(n=0; n < vTree.length; n++){
                vName = vTree[n].nodeName.replace('price','');
                vValue = vTree[n].firstChild.data;
                vPriceMessage = vValue;
                vPriceMessage = vPriceMessage.replace('{EXTAX}', 'Ex. VAT').replace('{INCTAX}', '').replace('{LOGIN}', 'Login for pricing').replace('{ERROR}', 'Check all options are selected');    
                if(document.getElementById('ajaxpprice'+vName) != null && 'ajaxpprice' != ''){
                    oPCID = document.getElementById('ajaxpprice'+vName);
                    oPCID.innerHTML = vPriceMessage;
                }
                if('productPrice'+vName != ''){
                    vPCClassArray = getElementsByClassName(document, '*', 'productPrice'+vName);
                    for(i=0; i < vPCClassArray.length; i++){
                        vPCClassArray[i].innerHTML = vPriceMessage;
                    }
                }
            }
        }
    }
    if(document.getElementById('ajaxpprice') != null && 'ajaxpprice' != ''){
    	oPCID = document.getElementById('ajaxpprice');
        oPCID.innerHTML = vPriceMessage;
    }
    if('productPrice' != ''){
    	vPCClassArray = getElementsByClassName(document, '*', 'productPrice');
        for(i=0; i < vPCClassArray.length; i++){
        	vPCClassArray[i].innerHTML = vPriceMessage;
        }
    }
	//target.ajaxInProgress = false;
	}

function fModVirtuemartAjaxItemChange (){
	flypage = document.addtocart.flypage.value;
    Itemid = document.addtocart.Itemid.value;
    category_id = document.addtocart.category_id.value;
    prod_id = document.addtocart['prod_id[]'];
    product_id = prod_id[prod_id.selectedIndex].value;
	vUrl = '/index.php?option=com_virtuemart&amp;page=shop.product_details&amp;flypage=' + flypage + '&amp;Itemid=' + Itemid + '&amp;category_id='+ category_id + '&amp;product_id=' + product_id;
    document.location.href = vUrl;
}