// Remove space characters
function Trim(sValue)
{		
	sValue = sValue.replace(/(^\s*)|(\s*$)/g, "");
	return sValue;
}

// Return a random number between 0 and iMax-1
function GetRandom(iMax) {
    return Math.floor(Math.random() * iMax);
}

function GetBannerId(sDivId)
{
    var bannerId = new String(sDivId);
    return bannerId.replace('divBanner', '');
}

function OnClickBanner(oEvent, oDiv, newWindow, url, logClick)
{
    if (logClick == true)
    {
        try
        {
            WebSiteServices.WSBanners.BannerClick(GetBannerId(oDiv.id));
        }
        catch (ex)
        {
            alert(ex);
        }
    }

    if (newWindow == true)
        window.open(url);
    else
        document.location.href = url;
}

// Show a random banner among all the available in the specified array
function ShowRandomBanner(arBanners, logView) {
    if (arBanners.length > 0)
    {
        // Hide all banners
        for (i = 0; i < arBanners.length; i++)
            document.getElementById(arBanners[i]).style.display = 'none';

        // Show a new (random) one
        var iDiv = GetRandom(arBanners.length);
        var oDiv = document.getElementById(arBanners[iDiv]);
        oDiv.style.display = 'block';

        if (logView == true)
            WebSiteServices.WSBanners.BannerView(GetBannerId(oDiv.id));
    }
}

// Resets field value
function ResetField(oField, defaultValue) {
	if (defaultValue == oField.value)
		oField.value = "";
	else 
		if (oField.value == "")
			oField.value = defaultValue;
}

// Check form submit
document.onkeypress = CheckSubmit;
function CheckSubmit(oEvent) {
    oEvent = (oEvent) ? oEvent : event;
    var keyCode;

    if (oEvent.keyCode)
        keyCode = oEvent.keyCode;
    else
        keyCode = oEvent.which;

	if (keyCode == 13) 
	    if (CurrentSubmitId != '')
	    {
            var oSubmit = document.getElementById(CurrentSubmitId);
            if (oSubmit != null)
                oSubmit.click();
            CancelEvent(oEvent);
	    }
}

var CurrentSubmitId = '';
function SetSubmit(buttonId) {
    CurrentSubmitId = buttonId;
}

function ClearSubmit() {
    CurrentSubmitId = '';
}

// Cancel event propagation
function CancelEvent(oEvent)
{
    if (!oEvent)
        return;

	oEvent.cancelBubble = true;
	oEvent.returnValue = false;

	if (oEvent.stopPropagation)
	    oEvent.stopPropagation();

    if (oEvent.preventDefault)
        oEvent.preventDefault();
}

// Allows only digits for input
function NumbersOnly(evt) {
    evt = (evt) ? evt : event;
    var c = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : ((evt.which) ? evt.which : 0));
    if (c > 31 && (c < 48 || c > 57))
        return false;
    return true;
}

function ClearForm(oForm)
{
    var aInputs = document.getElementsByTagName('input');

    for (i = 0; i < aInputs.length; i++)
    {
        if ((aInputs[i].getAttribute('type') == 'text') && (aInputs[i].getAttribute('defaultValue') == aInputs[i].getAttribute('value')))
            aInputs[i].setAttribute('value', '');
    }

    return true;
}

function ResetForm()
{
    var aInputs = document.getElementsByTagName('input');

    for (i = 0; i < aInputs.length; i++)
    {
        if ((aInputs[i].getAttribute('type') == 'text') && (aInputs[i].getAttribute('defaultValue') == '') && (aInputs[i].getAttribute('value') == '') && 
            (aInputs[i].getAttribute('onfocus') != null))
        {
            var oFocusParam = new String(aInputs[i].getAttribute('onfocus'));
            if (oFocusParam.indexOf("ResetField") > 0)
            {
                oFocusParam = oFocusParam.substring(oFocusParam.indexOf("ResetField") + 18);
                oFocusParam = oFocusParam.substring(0, oFocusParam.indexOf("'"));
                ResetField(aInputs[i], oFocusParam);
            }
        }
    }
}

var state = 'none';
function ToggleDisplay(layer_ref)
{
    if (state == 'block')
        state = 'none';
    else
        state = 'block';

    if (document.all)
        eval( "document.all." + layer_ref + ".style.display = state");
    if (document.layers)
        document.layers[layer_ref].display = state; 

    if (document.getElementById &&!document.all)
    {
        hza = document.getElementById(layer_ref);
        hza.style.display = state;
    }
}

var ImgNum = 0;
function chgImg(arImg, direction) {
    var ImgLength = arImg.length - 1;

    if (document.images) {
        ImgNum = ImgNum + direction;

        if (ImgNum > ImgLength)
            ImgNum = 0;

        if (ImgNum < 0)
            ImgNum = ImgLength;

        document.slideshow.src = arImg[ImgNum];
        document.getElementById("artCredits").innerText = document.getElementById("artCredits" + ImgNum).innerText;
        document.getElementById("arttext").innerHTML = document.getElementById("arttext" + ImgNum).innerHTML;
    }
}

function OpenUrl(url)
{
    window.open(url, 'ebook', 'status=0,toolbar=0,location=0,menubar=0,scrollbars=0,resizable=1,width=800,height=600');
    return false;
}

function GetBaseURL(withAppPath)
{
    var appPath = window.location.pathname.substring(0, window.location.pathname.indexOf('/', 2));
    var port = new String(window.location.port);

    if (port != '')
        port = ':' + port;

    var retVal = window.location.protocol + '//' + window.location.hostname + port;
    if (withAppPath)
        retVal = retVal + appPath;
    retVal = retVal + '/'

    return retVal;
}

function ValidateSearch(sTextBox) 
{
    var retVal = true;

    var oText = document.getElementById(sTextBox);
    if ((Trim(oText.value) == '') || (Trim(oText.value).length < 3))
    {
        alert('Por favor, introduza texto com pelo menos 3 caracteres.');
        retVal = false;
    }

    return retVal;
}

function SubmitAction(sSubmit, sAction, sProductId, action, productId)
{
    document.getElementById(sAction).value = action;
    document.getElementById(sProductId).value = productId;
    document.getElementById(sSubmit).click();
    return false;
}

function ValidateCreditCard(source, arguments)
{
    var cardNumber = arguments.Value;

    if (cardNumber.length < 13 || cardNumber.length > 16)
        arguments.IsValid = false;
    else
    {
        var sum = 0;
        var alt = false;
        var numvar = 0;
        
        for (var i = cardNumber.length - 1; i >= 0; i--)
        {
            numvar = parseInt(cardNumber.charAt(i));
            if (alt)
            {
                numvar *= 2;
                if (numvar > 9)
                    numvar -= 9;
            }
            sum += numvar;
            alt = !alt;
        }
        
        arguments.IsValid = (sum % 10 == 0);
    }
}

function ValidateDate(source, arguments)
{
    arguments.IsValid = (arguments.Value != '');
}

function ToogleZipCodeHelp(oSelect, sZipCodeLabel)
{
    if (oSelect.options[oSelect.selectedIndex].text == "Portugal")
        document.getElementById(sZipCodeLabel).style.visibility = 'visible';
    else
        document.getElementById(sZipCodeLabel).style.visibility = 'hidden';
}