var LOGIN = "Login";
var LOGOUT = "Logout";
var NOPOPUP = "!Popup";

var mServletRelativeReference;

var mShowing = "";

function showError( pErrorText, pException )
{
    var verNode = document.getElementById("Version");
    var version = "Version Unknown";
    if ( verNode )
    {
        try
        {
            version = verNode.firstChild.nodeValue;
        }
        catch ( e )
        {
            version = e;
        }
    }
    alert(pErrorText + "\n\n" + version + "\n\n" + pException);
}

function log( pText )
{
    var zDebugPanel = document.getElementById("dbg");
    if ( zDebugPanel )
    {
        zDebugPanel.innerHTML = zDebugPanel.innerHTML + "<br>" + pText;
    }
}

function showing( pWhat )
{
    log("showing:" + pWhat);
    mShowing = pWhat;
}

function getLLframe()
{
    return document.getElementById("LLframe");
}

function shouldShow( pWhat )
{
    log("shouldShow:" + pWhat + " | was:" + mShowing);
    if ( mShowing != pWhat )
    {
        forceShow(pWhat);
    }
}

function forceShow( pWhat )
{
    mShowing = pWhat;
    var zLLframe = getLLframe();
    if ( zLLframe )
    {
        var zRequesting = mServletRelativeReference + "?" + pWhat + "PageRequest-" + Math.random();
        log("requesting:" + zRequesting);
        zLLframe.src = zRequesting;
    }
    else
    {
        log("No LLframe");
    }
}

function showingLogin()
{
    showing(LOGIN);
}

function showingLogout()
{
    showing(LOGOUT);
}

function shouldShowLogin()
{
    shouldShow(LOGIN);
    updateAcked();
}

function shouldShowLogout()
{
    shouldShow(LOGOUT);
    updateAcked();
}

var mPendingPoll = false;
var mWaitingRequests = false;
var mAwaitingResponse = false;

function pollUpdate()
{
    var now = new Date();
    log("pollUpdate - " + now.getHours() + ":" + now.getMinutes() + ":" + now.getSeconds());
    clientUpdate("");
}

function updateAcked()
{
    mAwaitingResponse = false;
    if ( mWaitingRequests )
    {
        clientUpdate("");
    }
    else
    {
        mPendingPoll = window.setTimeout(pollUpdate, 15000);
    }
}

function clientUpdate( pRequest )
{
    if ( !mWaitingRequests )
    {
        mWaitingRequests = pRequest;
    }
    else if ( pRequest != "" )
    {
        mWaitingRequests = mWaitingRequests + "," + pRequest;
    }
    if ( !mAwaitingResponse )
    {
        if ( mPendingPoll )
        {
            window.clearTimeout(mPendingPoll);
            mPendingPoll = false;
        }

        var zRequesting = mServletRelativeReference + "?Status(" + mWaitingRequests + ")" + Math.random();

        mAwaitingResponse = true;
        mWaitingRequests = false;

        log("requesting:" + zRequesting);

        var script = document.createElement("script");
        script.setAttribute("src", zRequesting);
        script.setAttribute("type", "text/javascript");
        document.body.appendChild(script);
    }
}

function clientOpen( pEncodedClientID )
{
    log("clientOpen:" + pEncodedClientID);
    clientUpdate("+" + pEncodedClientID);
}

function clientClose( pEncodedClientID )
{
    log("clientClose:" + pEncodedClientID);
    clientUpdate("-" + pEncodedClientID);
}

function requestClientStatus()
{
    log("requestClientStatus");
    clientUpdate("");
}

function popupBlocked()
{
    log("popupBlocked");
    clientUpdate(NOPOPUP);
}

function launchApp( pURL, pWinName, pLaunchAppParams )
{
    showing("launchApp");
    try
    {
        var winHandle = window.open(pURL, pWinName, pLaunchAppParams);
        if ( !winHandle )
        {
            popupBlocked();
            return;
        }
    }
    catch ( e )
    {
        showError("Window.open( '" + pURL + "', '" + pWinName + "', '" + pLaunchAppParams + "' )", e);
    }
    shouldShow(LOGOUT);
}

function startPolling()
{
    var zLLframe = getLLframe();
    if ( zLLframe )
    {
        requestClientStatus();
    }
    else
    {
        showError("LLframe Frame Not Found", "");
    }
}

function initPage( pServletRelativeReference )
{
    log("initPage");
    mServletRelativeReference = pServletRelativeReference;
    window.setTimeout(startPolling, 100);
}