/***************************************************************************
 *   Copyright (C) 2006 by Tobias Koenig <tokoe@kde.org>                   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Library 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.                          *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this program; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/

#include "agentmanager.h"
#include "controlmanager.h"
#include "processcontrol.h"

#include "akapplication.h"
#include "akcrash.h"
#include "akdebug.h"
#include "akdbus.h"

#include <QtCore/QCoreApplication>
#include <QtDBus/QDBusConnection>
#include <QtDBus/QDBusError>

#include <stdlib.h>
#include <config-akonadi.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

static AgentManager *sAgentManager = 0;

void crashHandler( int )
{
  if ( sAgentManager ) {
    sAgentManager->cleanup();
  }

  exit( 255 );
}

int main( int argc, char **argv )
{
  AkCoreApplication app( argc, argv );
  app.setDescription( QLatin1String( "Akonadi Control Process\nDo not run this manually, use 'akonadictl' instead to start/stop Akonadi." ) );
  app.parseCommandLine();

  // try to acquire the lock first, that means there is no second instance trying to start up at the same time
  // registering the real service name happens in AgentManager::continueStartup(), when everything is in fact up and running
  if ( !QDBusConnection::sessionBus().registerService( AkDBus::serviceName( AkDBus::ControlLock ) ) ) {
    // We couldn't register. Most likely, it's already running.
    const QString lastError = QDBusConnection::sessionBus().lastError().message();
    if ( lastError.isEmpty() ) {
      akFatal() << "Unable to register service as" << AkDBus::serviceName( AkDBus::ControlLock ) << "Maybe it's already running?";
    } else {
      akFatal() << "Unable to register service as" << AkDBus::serviceName( AkDBus::ControlLock ) << "Error was:" << lastError;
    }
  }

  // older Akonadi server versions don't use the lock service yet, so check if one is already running before we try to start another one
  if ( QDBusConnection::sessionBus().interface()->isServiceRegistered( AkDBus::serviceName( AkDBus::Control ) ) ) {
    akFatal() << "Another Akonadi control process is already running.";
  }

  new ControlManager;

  sAgentManager = new AgentManager;
  AkonadiCrash::setEmergencyMethod( crashHandler );

  int retval = app.exec();

  delete sAgentManager;
  sAgentManager = 0;

  return retval;
}