// Global Variables
var ProgressBar_Responsiveness     = 1000;              // Refresh Progress-Bar every 0.5 sec
var ProgressBar_State              = 0;                 // 0 = Stopped, 1 = Running
var ProgressBar_request            = createXMLHttpRequest()


/**********************************************************************************************
* UpdateProgressBar()                                                                         *
*                                                                                             *
*                                                                                             *
**********************************************************************************************/
function UpdateProgressBar(strPercentage)
{
    var str = "";
    var Width_Factor = 3;

    var Percentage = Number(strPercentage);
    
    if ((Percentage >= 0) && (Percentage <= 100))
    {
	str = str + "<img src=\"images/bar_full.jpg\" height=\"18x\" width=\"" + Width_Factor*Percentage + " px\" />\n";
        str = str + "<img src=\"images/bar_empty.jpg\" style=\"position: relative; left: -10px;\" height=\"18px\" width=\"" + Width_Factor*(100-Percentage) + " px\" />\n";

        str = str + "      " + Percentage + "%";
    }
    else
    {
        str = "";
    }    

    if (document.getElementById('ProgressBar') != null)
    {
        document.getElementById('ProgressBar').innerHTML = str;
    }
}


/**********************************************************************************************
* ProcessProgressBar()                                                                        *
*                                                                                             *
*                                                                                             *
**********************************************************************************************/
function ProcessProgressBar()
{
    if (ProgressBar_State == 1)
    {
	    ProgressBar_request = new createXMLHttpRequest();
		ProgressBar_request.open('GET', '/index.cgi?script=cms_cgi&action=GetProgressBar', true);	
	    ProgressBar_request.onreadystatechange = ProcessProgressBar_handle;
	    ProgressBar_request.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
	    ProgressBar_request.send(null);
	}
}

/**********************************************************************************************
* ProcessProgressBar_handle()                                                                 *
*                                                                                             *
**********************************************************************************************/
function ProcessProgressBar_handle()
{
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    // In case GetProgress fails
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    if (ProgressBar_request.readyState != 4)
    {
        return;
    }
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

	var response = ProgressBar_request.responseText;

	lines = response.split('\n');
	
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    // In case GetProgress fails
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    if (response.indexOf("ERROR") != -1)
    {
        UpdateProgressBar(-1);
        return;
    }
    // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

        
    var percentage = Number(lines[0]);
    //alert(percentage);
    
    if (ProgressBar_State == 1)
    {
        UpdateProgressBar(percentage);
    	setTimeout("ProcessProgressBar()", ProgressBar_Responsiveness);
    }
}

/**********************************************************************************************
* SetProgressBar()                                                                            *
*                                                                                             *
* Save the percentage into the "progress.txt" file                                            *
*                                                                                             *
**********************************************************************************************/
function SetProgressBar(percentage)
{
	var oRequest = new createXMLHttpRequest();

    // Reflect the change immediately on screen
    UpdateProgressBar(percentage);
	oRequest.open('GET', '/index.cgi?script=cms_cgi&action=SetProgressBar&Percentage='+ percentage,false);
	oRequest.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
	oRequest.send(null);

	// Error Reading the file
	if (oRequest.status!=200)
	{
		return;
	}
}

/**********************************************************************************************
* StartProgressBar()                                                                          *
*                                                                                             *
*                                                                                             *
**********************************************************************************************/
function StartProgressBar(percentage)
{
	ProgressBar_State = 1;
	
	SetProgressBar(percentage);
	ProcessProgressBar();
}

/**********************************************************************************************
* StopProgressBar()                                                                           *
*                                                                                             *
*                                                                                             *
**********************************************************************************************/
function StopProgressBar()
{
	ProgressBar_State = 0;

	UpdateProgressBar(-1);
}