<?php
/**
 *  
 * @author  Benjamin Gillissen <hide@address.com>
 * 
 *	**************************************************************

	Copyright (C) 2009  Benjamin Gillissen
	
	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details at:
	http://www.gnu.org/copyleft/gpl.html

 *	**************************************************************
 */
class sessions {
	
	private static $_SESS;

	public static function start($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return $SESSRef; }
		if ( isset(self::$_SESS[$SESSRef]) ){ return (FALSE !== self::$_SESS[$SESSRef]); }
		$type = configs::get('sessions', $SESSRef, 'type');
		if ( FALSE === $type ){
			errors::raise("Sessions : $SESSRef, Missing 'type' configuration, check your config file !", CORE_LOG_ERROR, 'SESS');
			self::$_SESS[$SESSRef] = FALSE; 
			return FALSE; 
		}
		$class = 'sess_'.$type;
		self::$_SESS[$SESSRef] = new $class($SESSRef);
		if ( FALSE === self::cleanup($SESSRef) ){
			errors::raise("Sessions : $SESSRef, could not be cleaned, abording !", CORE_LOG_ERROR, 'SESS');
			self::$_SESS[$SESSRef] = FALSE;
			return FALSE; 
		}
		$r = self::$_SESS[$SESSRef]->start();
		if ( FALSE ===  $r ){
			errors::raise("Sessions : $SESSRef, could not be started, abording !", CORE_LOG_ERROR, 'SESS');
			self::$_SESS[$SESSRef] = FALSE;
			return FALSE;
		}
		return $r;
	}
	
	private static function cleanup($SESSRef){
		while( FALSE !== ($tmp = self::$_SESS[$SESSRef]->tocleanup()) ){ $tocleanup[] = $tmp; }
		if ( !isset($tocleanup) ){ 
			errors::raise("Sessions : $SESSRef, No sessions need to be cleaned", CORE_LOG_NOTICE, 'SESS');
			return TRUE; 
		}
		errors::raise("Sessions : $SESSRef, cleaning ".count($tocleanup).' sessions.', CORE_LOG_NOTICE, 'SESS');
		/*
		if ( CORE_AUTH ){
			$confs = CORE::getconf(realm::CONF);
			foreach($confs['realm'] as $realm => $conf ){
				if ( $conf['SESSRef'] == $SESSRef ){
					$auth = new authority($realm);
					$auth->cleanup_sessionwatch($tocleanup);
				}	
			}
		}
		*/
		return self::$_SESS[$SESSRef]->cleanup($tocleanup);
	}
	
	public static function sessid($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( CORE::isError($SESSRef) ){ return FALSE; }
		if (  FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->get_sessid();
	}
	
	public static function istarted($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( isset(self::$_SESS[$SESSRef]) ){ return ( FALSE !== self::$_SESS[$SESSRef]); }
		return FALSE;
	}

	public static function stop($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		unset(self::$_SESS[$SESSRef]);	//destroy object
		return TRUE;
	}
	
	public static function store($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->store();//store var cache
	}
	
	public static function destroy($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		self::$_SESS[$SESSRef]->destroy();//remove stored var cache
		self::$_SESS[$SESSRef]->clearcache();//unset cache
		unset(self::$_SESS[$SESSRef]);	//destroy object
		return TRUE;
	}
	
	public static function clear($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		self::$_SESS[$SESSRef]->clearcache();//unset cache
		return TRUE;
	}
	
	public static function isdefined($var, $SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->isdefined($var);
	}
	
	public static function read($var, $SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){ 
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->read($var);
	}
	
	public static function readall($SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){ 
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->readall();
	}
	
	public static function set($var, $val, $SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->set($var, $val);
	}
	
	public static function del($var, $SESSRef=NULL){
		$SESSRef = self::getref($SESSRef);
		if ( FALSE === $SESSRef ){ return FALSE; }
		if ( FALSE === self::istarted($SESSRef) ){
			errors::raise('You must start a session before using it !', CORE_LOG_ERROR, 'SESS');
			return FALSE;
		}
		return self::$_SESS[$SESSRef]->del($var);
	}
	
	private static function getref($SESSRef){
		if ( NULL === $SESSRef OR empty($SESSRef) ){		//no args gived, we return default session handler
			if ( FALSE !== ( $SESSRef = configs::get('sessions', 'Default')) ){ return $SESSRef; }
		} elseif ( is_array( configs::get('sessions', $SESSRef)) ){ return $SESSRef; }
		errors::raise('Invalid Sessions reference ! ', CORE_LOG_ERROR, 'SESS');
		return FALSE;
	}
	
	public static function cookref($SESSRef=NULL){ return ini_get('session.name'); }

}