var pageName = document.location.href;
var lnkPath = "./ajax_con/online_users.php";
var lnkRoot = "./";
if (pageName.indexOf('/hall/') != -1) {
var lnkPath = "../ajax_con/online_users.php";
var lnkRoot = "../";
}

var XMLObj = createXmlHttpRequestObject();
/* creates an XMLHttpRequest instance */
function createXmlHttpRequestObject() 
{
  // will store the reference to the XMLHttpRequest object
  var xmlHttp;
  // this should work for all browsers except IE6 and older
  try
  {
    // try to create XMLHttpRequest object
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    // assume IE6 or older
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    // try every prog id until one works
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        // try to create XMLHttpRequest object
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}

// function that displays an error message
function displayError(message)
{
  // display error message, with more technical details if debugMode is true
  // alert("Error accessing the server! "+ "<br/>" + message);
}

/* add user refresh user to online list */
function getOnlineUsers(url, gotIt)
{
	var pageName = document.location.href;
	var pageName = pageName.substring(pageName.lastIndexOf('/') + 1);
	var getUrl = url + "?pLocation=" + pageName + "&gotIt=" + gotIt;
  if(XMLObj) {
	try
    {
      if (XMLObj.readyState == 4 || XMLObj.readyState == 0) 
      {

	  XMLObj.open("GET", getUrl, true);
	  XMLObj.onreadystatechange = handleReceivingUserOnline;
	  XMLObj.send(null);
	  }
    }
    catch(e)
    {
      displayError(e.toString());
    }
  }
}

function handleReceivingUserOnline()
{
  if (XMLObj.readyState == 4) 
  {
	// continue only if HTTP status is "OK"
	if (XMLObj.status == 200) 
	{
	  try
	  {	  
		// retrieve the document element
		response = XMLObj.responseXML.documentElement;
		// retrieve the arrays from the server's response     
		notifyArray = response.getElementsByTagName("notifyText");
		  if(notifyArray.length>0) {
			for(var i=0; i<notifyArray.length; i++)
			{
			createFloatingWindow("IPM", 0, 0, "none");
			}
		  }
      }
      catch(e)
      {
        // display the error message
        displayError(e.toString());
      }
	}
	else
	{
	  // display the error message
	  displayError(XMLObj.statusText);
	}
  }
}

function startTime()
{
   setTimeout('startTime()',30000); // how often to ping the server (30000 = 30 seconds)
   getOnlineUsers(lnkPath,'0');
}

// create auto info window 
function createFloatingWindow(floatType, extId, userId, sName)
{
  var mainDiv = document.getElementById('gFloatWindow');
  var fw = document.createElement('div');
  mainDiv.appendChild(fw);
  switch(floatType){
	  // create element for private chat
	  case 'prvReq' + extId:
  var nText = "کاربر " + sName + " مایل به گفتگوی زنده با شما است";
      nText += "<br />";
      nText += "[<a href=\"javascript:;\" onClick=\"windowNew('../chat/prv_window.php?rID=" + userId + "&sname=" + sName + "'), removeElement('gFloatWindow',childId);\" >تایید گفتگو</a>]&nbsp;&nbsp;&nbsp;[<a href=\"javascript:;\" onClick=\"requestAlertDenyPrv('" + userId + "'), removeElement('gFloatWindow',childId);\" >رد گفتگو</a>]";
	  fw.id = "prvReq" + extId;
	  childId = "prvReq" + extId;
	  document.getElementById(childId).innerHTML= nText;
	  break;
	  // create element for instant pm
	  case 'IPM':
	  fw.id = "IPM";
	  var nText = "یک پیام خصوصی جدید برای شما ارسال شده است.";
      nText += "<br />";
      nText += "[<a href=\"" +lnkRoot+ "user_private_msg.php\" onClick=\"getOnlineUsers(lnkPath,'1'), removeElement('gFloatWindow',childId), window.location=this.href;\" >صندوق پیام</a>]&nbsp;&nbsp;&nbsp;[<a href=\"javascript:;\" onClick=\"getOnlineUsers(lnkPath,'1'), removeElement('gFloatWindow',childId);\" >متوجه شدم</a>]";
	  childId = "IPM";
	  document.getElementById(childId).innerHTML= nText;
	  break;
  }
  mainDiv.style.display = "block";
  fw.style.backgroundColor = "#F66";
  fw.style.height = "50px";
  fw.style.width = "330px";
  fw.style.position = "absolute";
  fw.style.left = "20px";
  fw.style.top = "200px";
  fw.style.margin = "5px";
  fw.style.border = "double";
  fw.style.borderColor = "#FFF";
  fw.style.borderWidth = "1px";
  fw.style.zIndex = "200";
  fw.style.textAlign = "center";
  fw.style.direction = "rtl";
  fw.style.color = "#FFF";
}

function removeElement(parentDiv, childDiv){
     if (childDiv == parentDiv) {
          alert("The parent div cannot be removed.");
     }
     else if (document.getElementById(childDiv)) {     
          var child = document.getElementById(childDiv);
          var parent = document.getElementById(parentDiv);
          parent.removeChild(child);
     }
     else {
          alert("Child div has already been removed or does not exist.");
          return false;
     }
}