/*
 * $Id$
 *
 * Copyright (C) 2008 Greger Viken Teigre
 * Based on auth_b2b, Copyright (C) 2008 Iptego Gmbh
 * Based on the concept of mycc, Copyright (C) 2007 Sipwise GmbH
 * Based on the concept of sw_prepaid_sip, 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.
 *
 * 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
 */

#include "b2b_connect.h"

#include "log.h"
#include "AmUtils.h"
#include "AmAudio.h"
#include "AmPlugIn.h"
#include "AmMediaProcessor.h"
//#include "AmConfigReader.h"
#include "AmSessionContainer.h"

EXPORT_SESSION_FACTORY(b2b_connectFactory,MOD_NAME);

b2b_connectFactory::b2b_connectFactory(const string& _app_name)
: AmSessionFactory(_app_name)
// , user_timer_fact(NULL)
{
}


int b2b_connectFactory::onLoad()
{
//   AmConfigReader cfg;
//   if(cfg.loadFile(AmConfig::ModConfigPath + string(MOD_NAME ".conf")))
//     return -1;

//   user_timer_fact = AmPlugIn::instance()->getFactory4Di("user_timer");
//   if(!user_timer_fact) {
//     ERROR("could not load user_timer from session_timer plug-in\n");
//     return -1;
//   }

  return 0;
}


AmSession* b2b_connectFactory::onInvite(const AmSipRequest& req)
{
//   AmDynInvoke* user_timer = user_timer_fact->getInstance();
//   if(!user_timer) {
//     ERROR("could not get a user timer reference\n");
//     throw AmSession::Exception(500,"could not get a user timer reference");
//   }

  return new b2b_connectDialog(); //user_timer);
}


b2b_connectDialog::b2b_connectDialog() // AmDynInvoke* user_timer)
: m_state(BB_Init),
  //m_user_timer(user_timer),
  AmB2ABCallerSession()

{
  rtp_str.setPlayoutType(ADAPTIVE_PLAYOUT); 
}

b2b_connectDialog::~b2b_connectDialog()
{
}

void b2b_connectDialog::onInvite(const AmSipRequest& req)
{
  // TODO: do reinvites get here? if so, don't set a timer then
  // -> yes, they do.

  // TODO: errors thrown as exception don't seem to trigger a reply?
  // -> only in SessionFactory::onInvite they do. todo: move the logic to 
  //    session factory 

  //setReceiving(false);
  //AmMediaProcessor::instance()->removeSession(this);

  string app_param = getHeader(req.hdrs, PARAM_HDR);

  if (!app_param.length()) {
    AmSession::Exception(500, "b2b_connect: parameters not found");
  }

  domain = get_header_keyvalue(app_param,"d");
  user = get_header_keyvalue(app_param,"u");
  password = get_header_keyvalue(app_param,"p");

  from = "sip:"+user+"@"+domain;
  to = "sip:"+req.user+"@"+domain;

//   DBG("-----------------------------------------------------------------\n");
//   DBG("domain = %s, user = %s, pwd = %s, from = %s, to = %s;",  
//       domain.c_str(), user.c_str(), password.c_str(), from.c_str(), to.c_str());
//   DBG("-----------------------------------------------------------------\n");

  m_state = BB_Dialing;

  if(dlg.reply(req, 100, "Connecting") != 0) {
    throw AmSession::Exception(500,"Failed to reply 100");
  }

  invite_req = req;
  size_t pos1, pos2, hdr_start;

  if (findHeader(invite_req.hdrs,PARAM_HDR, pos1, pos2, 
		 hdr_start)) {
    while (invite_req.hdrs[pos2]=='\r' ||invite_req.hdrs[pos2]=='\n') 
      pos2++;

    hdr_start -= 11; //"P-App-Param"
    invite_req.hdrs.erase(hdr_start, pos2-hdr_start);
  }

  if (findHeader(invite_req.hdrs,"P-App-Name", pos1, pos2, 
		 hdr_start)) {
    while (invite_req.hdrs[pos2]=='\r' ||invite_req.hdrs[pos2]=='\n') 
      pos2++;
    hdr_start -= 10; //"P-App-Name"
    invite_req.hdrs.erase(hdr_start, pos2-hdr_start);
  }

  dlg.updateStatus(req);
  recvd_req.insert(std::make_pair(req.cseq,req));
  
  connectCallee("<" + to + ">", to, from, from);
}

void b2b_connectDialog::onSessionStart(const AmSipRequest& req)
{
  AmB2ABCallerSession::onSessionStart(req);
}

void b2b_connectDialog::onB2ABEvent(B2ABEvent* ev)
{
  if (ev->event_id == B2ABConnectOtherLegException) {
    B2ABConnectOtherLegExceptionEvent* ex_ev = 
      dynamic_cast<B2ABConnectOtherLegExceptionEvent*>(ev);
    if (ex_ev && dlg.getStatus() == AmSipDialog::Pending) {
      DBG("callee leg creation failed with exception '%d %s'\n",
	  ex_ev->code, ex_ev->reason.c_str());
      dlg.reply(invite_req, ex_ev->code, ex_ev->reason);
      setStopped();
      return;
    }
  }

  if (ev->event_id == B2ABConnectOtherLegFailed) {
    B2ABConnectOtherLegFailedEvent* f_ev = 
      dynamic_cast<B2ABConnectOtherLegFailedEvent*>(ev);
    if (f_ev && dlg.getStatus() == AmSipDialog::Pending) {
      DBG("callee leg creation failed with reply '%d %s'\n",
	  f_ev->code, f_ev->reason.c_str());
      dlg.reply(invite_req, f_ev->code, f_ev->reason);
      setStopped();
      return;
    }
  }

  if (ev->event_id == B2ABConnectAudio) {
    // delayed processing of first INVITE request
    AmSession::onInvite(invite_req);
  }

  AmB2ABCallerSession::onB2ABEvent(ev);
}

void b2b_connectDialog::process(AmEvent* ev)
{
//   AmPluginEvent* plugin_event = dynamic_cast<AmPluginEvent*>(ev);
//   if(plugin_event && plugin_event->name == "timer_timeout") {
//     int timer_id = plugin_event->data.get(0).asInt();
//     if (timer_id == TIMERID_CREDIT_TIMEOUT) {
//       DBG("timer timeout, no more credit\n");
//       stopAccounting();
//       terminateOtherLeg();
//       terminateLeg();

//       ev->processed = true;
//       return;
//     }
//   }

  AmAudioEvent* audio_event = dynamic_cast<AmAudioEvent*>(ev);
	
  if(audio_event && (audio_event->event_id == AmAudioEvent::cleared)){
    DBG("ignoring end of prompt.\n");
    return;
  }

  AmB2ABCallerSession::process(ev);
}

void b2b_connectDialog::onDtmf(int event, int duration)
{
  DBG("DTMF event %d duration %d\n", event, duration);
  return;
  
}


void b2b_connectDialog::onBye(const AmSipRequest& req)
{
  if (m_state == BB_Connected) {
//     stopAccounting();
  }
  terminateOtherLeg();
  setStopped();
}


void b2b_connectDialog::onCancel()
{
  if(dlg.getStatus() == AmSipDialog::Pending) {
    DBG("Wait for leg B to terminate");
  }
  else {
    DBG("Canceling leg A on CANCEL since dialog is not pending");
    dlg.reply(invite_req, 487, "Request terminated");
    setStopped();
  }
}


AmB2ABCalleeSession* b2b_connectDialog::createCalleeSession()
{
  b2b_connectCalleeSession* sess = new b2b_connectCalleeSession(getLocalTag(), user, password);

  AmSessionEventHandlerFactory* uac_auth_f = 
    AmPlugIn::instance()->getFactory4Seh("uac_auth");
  
  if (NULL != uac_auth_f) {
    DBG("UAC Auth enabled for new b2b_connect session.\n");
    AmSessionEventHandler* h = uac_auth_f->getHandler(sess);
    if (h != NULL )
      sess->addHandler(h);
    else {
      ERROR("unable to set SIP UAC auth for new session.");
    } 
  } else {
    ERROR("unable to get SIP UAC auth."
          "(uac_auth module loaded?)\n");
  }

  return sess;
}

b2b_connectCalleeSession::b2b_connectCalleeSession(const string& other_tag,
						   const string& user, const string& pwd) 
  : credentials("", user, pwd), // domain (realm) is unused in credentials 
    AmB2ABCalleeSession(other_tag) {

  rtp_str.setPlayoutType(ADAPTIVE_PLAYOUT); 
  setDtmfDetectionEnabled(false);
}

b2b_connectCalleeSession::~b2b_connectCalleeSession() {

}

inline UACAuthCred* b2b_connectCalleeSession::getCredentials() {
  return &credentials;
}

void b2b_connectCalleeSession::onSipReply(const AmSipReply& reply) {
  int status_before = dlg.getStatus();
  AmB2ABCalleeSession::onSipReply(reply);
  int status = dlg.getStatus();
 
  if ((status_before == AmSipDialog::Pending)&&
      (status == AmSipDialog::Disconnected)) {
    DBG("status change Pending -> Disconnected. Stopping session.\n");
    setStopped();
  }
}