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);
}

function getNewOrderId() {
    var string = document.cookie;
    var re = /order_(\d+)/gm;
    var order_ids = re.exec(string);
    if(order_ids){
        var max_id = 0;
        for(var i = 0; i <= order_ids.length; i++) {
            if(max_id < order_ids[i]){
                max_id = order_ids[i];
            }
        }
        return max_id*1.0 + 1;
    }else{
        return 1;
    }
}

function cartPut(product, qty) {
    createCookie('order_' + getNewOrderId(), product + 'x' + qty);
}

function cartRemove(id) {
    eraseCookie('order_' + id);
}

function formList(array) {
    var string = '(';
    for(var i = 0; i < array.length; i += 2) {
        if(i > 0) string += '|';
        string += array[i] + 'x' + array[i+1];
    }
    string += ')';
    return string;
}

function cartClean() {
    var id = 1;
    while( readCookie('order_' + id) ){
        cartRemove(id);
        id++;
    }
}

function getOrderQty(id) {
    var value = readCookie('order_' + id);
    var m = value.match(/\x(\d+)$/);
    return m[1];
}

function orderModify(id, qty) {
    var value = readCookie('order_' + id);
    value = value.replace( /x\d+$/, 'x' + qty );
    createCookie('order_' + id, value);
}