/*
 * $Id$
 *
 * Copyright (C) 2002-2003 Fhg Fokus
 *
 * This file is part of sems, a free SIP media server.
 *
 * sems 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * sems 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.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef SessionTimer_h
#define SessionTimer_h

#include "AmApi.h"
#include "AmSession.h"

#define MOD_NAME "session_timer"

/* Session Timer: -ssa */
class AmTimeoutEvent;
// these are the timer IDs for session timer
// Caution: do not use these for other purposes
#define ID_SESSION_INTERVAL_TIMER -1
#define ID_SESSION_REFRESH_TIMER  -2


class SessionTimerFactory: public AmSessionEventHandlerFactory
{
    bool checkSessionExpires(const AmSipRequest& req);

public:
    SessionTimerFactory(const string& name)
	: AmSessionEventHandlerFactory(name) {}

    int onLoad();
    bool onInvite(const AmSipRequest&);

    AmSessionEventHandler* getHandler(AmSession* s);
};

class SessionTimer: public AmSessionEventHandler
{
	AmSession* s;

    enum SessionRefresher {
      refresh_local,
      refresh_remote
    };
    enum SessionRefresherRole {
      UAC,
      UAS
    };

    void configureSessionTimer(const AmSessionTimerConfig& conf);
    AmSessionTimerConfig session_timer_conf;

    bool                 remote_timer_aware;
    unsigned int         session_interval;  
    SessionRefresher     session_refresher;
    SessionRefresherRole session_refresher_role;

    void updateTimer(AmSession* s,const AmSipRequest& req);
    void updateTimer(AmSession* s,const AmSipReply& reply);
    
    void setTimers(AmSession* s);
    void removeTimers(AmSession* s);

    string getReplyHeaders(const AmSipRequest& req);
    string getRequestHeaders(const string& method);

    /* Session Timer: -ssa */

    // @return true if OK
    void onTimeout();
    void onTimeoutEvent(AmTimeoutEvent* timeout_ev);

public:
    SessionTimer(AmSession*);
    virtual ~SessionTimer(){}

    /* @see AmSessionEventHandler */
    virtual bool process(AmEvent*);
    virtual bool onSipEvent(AmSipEvent*);
    virtual bool onSipRequest(const AmSipRequest&);
    virtual bool onSipReply(const AmSipReply&);

    virtual bool onSendRequest(const string& method, 
			       const string& content_type,
			       const string& body,
			       string& hdrs,
				   unsigned int cseq);

    virtual bool onSendReply(const AmSipRequest& req,
			     unsigned int  code,
			     const string& reason,
			     const string& content_type,
			     const string& body,
			     string& hdrs);
};


#endif