//
//  Globale Variablen
//
var _readyStateHooks = new Array();


//
//  Füge einen Ready-State-Hook hinzu
//
function addReadyStateHook( hook )
{
      if ( !inArray( hook, _readyStateHooks ) )
      {
	    _readyStateHooks[_readyStateHooks.length] = hook;
      }
}


//
//  Entferne einen Ready-State-Hook
//
function removeReadyStateHook( hook )
{
      arrayRemove( hook, _readyStateHooks );
}


//
//  Erzeugt ein neues XML-HTTP-Request-Object (je nach Browser) und gibt es zurueck
//
function newXMLHttpRequest()
{
      var xmlreq = false;

      if(window.XMLHttpRequest)
      {
	    xmlreq = new XMLHttpRequest();
      }
      else if(window.ActiveXObject)
      {
	    try
	    {
		  xmlreq = new ActiveXObject("Msxml2.XMLHTTP");

	    }
	    catch(e1)
	    {
		  try
		  {
		      xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
		  }
		  catch(e2)
		  {
		  }
	    }
      }

      return xmlreq;
}



//
//  Behandelt die Rueckgabe des XML-HTTP-Requests entsprechend des HTTP-Error-Codes
//
function getReadyStateHandler ( req, responseXmlHandler, target, reqAction )
{
      return function()
      {
	    if( req.readyState == 4 )
	    {
// 	      alert(req.status);
		  if( req.status == 200 )
		  {
		      // req.responseText contains response in plain text
		      // req.responseXml contains XML or parsed DOM tree, RTFM!

			//responseXmlHandler(target, req.responseText);
			if ( target != null ) responseXmlHandler( target, req.responseText, reqAction );
		  }
		  else if ( req.status == 401 )
		  {
			window.ignoreMods = true;
			window.location.href = window.baseUrl+"logout.php?sid="+window.sid;
		  }
		  else if( req.status == 403 )
		  {
			// http status 403, do something about that..
		  }
		  else
		  {
			if ( target != null )
			{
			      var errorString = "Error: "+req.status+' '+reqAction;
// 			      alert( errorString );
			      responseXmlHandler( target, errorString, reqAction );
			}
		  }

	    }
      }
}


//
//  Schreibt den Inhalt content in das HTML-Element target
//
function update ( target, content, actionName )
{
      if ( typeof target == 'object' )
      {
	    target.responseHandler( content );
      }
      else
      {
	    var elem = document.getElementById(target);
	    if( elem ) elem.innerHTML = content;
      }

      for ( var i = 0; i < _readyStateHooks.length; i++ )
      {
	    eval( _readyStateHooks[i]+"( target );" );
      }

      if ( self.updateReport ) updateReport( actionName );
      if ( self.updateSysTray ) updateSysTray();
} 


//
//  Fuehrt eine serverseitige Funktion aus
//
function action( name, target, getParams, postParams )
{
//   alert(target.id);
      send( name, target, getParams, postParams );
}

function raction( name, param, responseHandler )
{
      req = send( name, null, param );
      req.onreadystatechange = function() {
	    if ( req.readyState == 4 && req.status == 200 ) eval( responseHandler+"( req.responseText );" );
      }
}


//
//  Sendet einen XMLHTTPRequest an action.php ab, und schreibt die Rueckgabe
//  in das HTML-Element mit der ID target
//
function send( reqAction, target, getParams, postParams )
{
      if ( target === undefined ) target = activeId;

      var req = newXMLHttpRequest();
      var handlerFunction = getReadyStateHandler(req, update, target, reqAction);
      var project = ( window['projectCode'] != undefined ) ? "&project=" + window['projectCode'] : "";
      var projectLang = ( window['projectLang'] != undefined ) ? "&projectlang=" + window['projectLang'] : "";
      var reqUrl = "action.php?action="+reqAction+project+projectLang;
      if ( getParams != undefined ) reqUrl += '&' + getParams;
      if ( postParams == undefined ) var postParams = '';
      //var params = encodeURI( param1 );
      //params += encodeURI("&param1=" + param1);

      req.onreadystatechange = handlerFunction;
      req.open( "POST", reqUrl, true );
      req.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded; charset=utf-8" );
      req.setRequestHeader("Content-length", postParams.length);
      req.setRequestHeader("Connection", "close");
      req.send( postParams );

      return req;
}


//
//  Überprüft, ob auf eine entfernte Datei zugegriffen werden kann
//
function fileExists( fileName )
{
      var test = newXMLHttpRequest();
      test.open("GET", fileName, false);
      test.send();

      return ( test.status == 200 ) ? true : false;
}


//
//  Laedt eine JavaScript-Datei in den DOM-Baum nach
//
function loadScript( url, scrptId )
{
      if ( scriptId == undefined ) var scriptId = url.replace( /[\/\.]/g, '' );

      if ( document.getElementById( scriptId ) ) return;
/*    eval("var old = document.getElementById('"+scriptId+"')");
      if ( old != null )
      {
	    old.parentNode.removeChild( old );
	    delete old;
      }*/

      var script	= document.createElement( "script" );
      script.src	= url;
      script.type	= "text/javascript";
      script.id		= scriptId;

      document.getElementsByTagName("head")[0].appendChild( script );
}


//
//  Laedt einen CSS-Style-Sheet in den DOM-Baum nach
//
function loadCSS( url, sheetId )
{
      if ( sheetId == undefined ) var sheetId = url.replace( /[\/\.]/g, '' );
      if ( document.getElementById( sheetId ) ) return;

      var sheet = document.createElement( "link" );
      sheet.rel  = "stylesheet";
      sheet.href = url;
      sheet.id   = sheetId;
      document.getElementsByTagName("head")[0].appendChild( sheet );
}