<?php

class CSession
	{
	var $msSessionID;
	function CSession(&$oSystem)
		{
		$this->SessionDuration=SESSIONTIMEOUT;
		$this->oSystem=&$oSystem;
		if($this->oSessionDatabase=$this->oSystem->goGetDB("session"))
			{
			$this->msSessionStore="td".APPKEY."Sessions";
			$sQuery="CREATE TABLE IF NOT EXISTS ".$this->msSessionStore." (
											`SessionID` MEDIUMINT UNSIGNED NOT NULL ,
											`SessionData` MEDIUMTEXT NOT NULL ,
											`SessionDies` BIGINT NOT NULL ,
											PRIMARY KEY ( `SessionID` )
											)";
			$this->oSessionDatabase->mlQuery($sQuery);
		
		
			}
		else
			$oSystem->oError->gsGenerateFinalError("db");
		
		
		}
	function gbSessionKiller()
		{
		
		}
	function msGenerateSessionID()
		{
		$sSessionID=md5(mt_rand());
		while($this->oSessionDatabase->glGetNumberOfRecords($this->msSessionStore,"SessionID='".$sSessionID."'")==1)
			$sSessionID=md5(mt_rand());
		$this->msSessionID=$sSessionID;
		
		return $this->msSessionID	;
		}
	function gsGetCurrentSessionID()
		{
		
		return $this->msSessionID;
		}
	function gbSaveSessionData()
		{
		$asData["SerializedSessionData"]="'".serialize($this->masSessionData)."'";
		$asData["SessionDies"]=time()+SESSIONTIMEOUT;
		if ($this->oDB->gbUpdateArray($this->msSessionStore,$asData,"SessionID='".$this->msSessionID."'"))
			{
			return true;
			}
		return false;
		}
	function gvntSaveVar($sName,$vntValue)
		{
		$this->masSessionData[$sName]=$vntValue;
		}
	function gvntGetVar($sName,$x=false)
		{
		if (isset($this->masSessionData[$sName]))
			{
			return $this->masSessionData[$sName];
			}
		return $x;
		}
	function mbUnregisterSession()
		{
		session_destroy();
		return $this->oDB->gbDelete($this->msSessionStore,"SessionID='".$this->msSessionID."'");
		}
	function gbSaveVar($sVarName,$sValue)
		{
		$_SESSION[$sVarName]=$sValue;
		}
	function gvGetVar($sVarName)
		{
		if(isset($_SESSION[$sVarName]))
			return $_SESSION[$sVarName];
		return false;
		}
	function gDeleteVar($sVarName)
		{
		unset($_SESSION[$sVarName]);
		}
	function mbSessionExists($sSessionID=false)
		{		
		
		if($oResult=$this->oSessionDatabase->goQuery("SELECT * FROM ".$this->msSessionStore." WHERE UNIX_TIMESTAMP(NOW())>SessionDies"))
			{
			
			$aoSessions=$oResult->gaoGetAllRecords();
			$asS=array();
			foreach($aoSessions as $oSess)
				{
				array_push($asS,$oSess->SessionID);
				if(sizeof($asS)>30)
					{
					$sS="'".join("','",$asS)."'";
					$this->oSystem->oDB->goUpdate($this->oSystem->oUser->msUserTable,"CurrentSessionID='__abgemeldet__'","CurrentSessionID IN (".$sS.")");
					unset($asS);
					$asS=array();
					}
				}
			if(sizeof($asS)>0)
				{			
				$sS="'".join("','",$asS)."'";
				$this->oSystem->oDB->goUpdate($this->oSystem->oUser->msUserTable,"CurrentSessionID='__abgemeldet__'","CurrentSessionID IN (".$sS.")");
				}
			}
		$this->oSessionDatabase->goDelete($this->msSessionStore,"UNIX_TIMESTAMP(NOW())>SessionDies");
		if ($sSessionID=="")
			return false;
		if ($this->oSessionDatabase->glGetNumberOfRecords($this->msSessionStore,"SessionID='".$sSessionID."'")==0)
			return false;
		
		$asUpdateData["SessionDies"]=time()+$this->SessionDuration;
		$this->oSessionDatabase->goUpdateArray($this->msSessionStore,$asUpdateData,"SessionID='".$sSessionID."'");
		$this->msSessionID=$sSessionID;
		ini_set("session.use_cookies","0");
		ini_set("session.cache_limiter","nocache");
		setcookie("__MY__",$this->msSessionID,time()+7200,"/".CLIENTNAME."/");
		session_id("qs".$sSessionID);
		//session_save_path("c:/phpsessions/");
		
		session_start();
	
		return true;
		}
	
	function mvntStartSession()
		{
		// returns the sessionid in case of success
		// saves the sessionid in $oExternalData!
		$asData["SessionID"]="'".$this->msGenerateSessionID()."'";
		$asData["SessionDies"]=time()+$this->SessionDuration;
		if ($this->oSessionDatabase->goInsertArray($this->msSessionStore,$asData))
			{
			return $this->msSessionID;
			}
		else
			{
			return false;
		}
		return true;
		}
	
	}