/****************************************************************************
**
** Copyright (C) 2004-2006 Tilo Riemer <riemer@crossvc.com>,
**                         Frank Hemer <frank@hemer.org>
**
**
**----------------------------------------------------------------------------
**
**----------------------------------------------------------------------------
**
** CrossVC is available under two different licenses:
**
** If CrossVC is linked against the GPLed version of Qt 
** CrossVC is released under the terms of GPL also.
**
** If CrossVC is linked against a nonGPLed version of Qt 
** CrossVC is released under the terms of the 
** CrossVC License for non-Unix platforms (CLNU)
**
**
** CrossVC License for non-Unix platforms (CLNU):
**
** Redistribution and use in binary form, without modification, 
** are permitted provided that the following conditions are met:
**
** 1. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 2. It is not permitted to distribute the binary package under a name
**    different than CrossVC.
** 3. The name of the authors may not be used to endorse or promote
**    products derived from this software without specific prior written
**    permission.
** 4. The source code is the creative property of the authors.
**    Extensions and development under the terms of the Gnu Public License
**    are limited to the Unix platform. Any distribution or compilation of 
**    the source code against libraries licensed other than gpl requires 
**    the written permission of the authors.
**
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR 
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** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**
**
** CrossVC License for Unix platforms:
**
** 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, version 2 of the License.
** 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 version 2 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.
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*****************************************************************************/

#ifndef TZCONVERT_H
#define TZCONVERT_H

#include <sys/time.h>

#include "globals.h"

inline QDateTime convertTimeZone(QDateTime &dateTime, bool hasDSTBug, bool toUTC)
{
   //ATTENTION: we have to check the timezone for modification time
   //of every file because we have files modified in the winter
   //and files modified in the summer

   Q_UNUSED(hasDSTBug)

#ifdef USE_TM_GMTOFF
   int diff = 0;
   struct tm *result = NULL;
   time_t t_loc = TIMEZERO.secsTo(dateTime);
   result = localtime(&t_loc);
   if (result) {
      diff = -(result->tm_gmtoff);
   }
#else
   int diff = timeZoneDiffInSecs;
   struct tm *result = NULL;

   time_t t_loc = TIMEZERO.secsTo(dateTime);
   result = localtime(&t_loc);
   if (result) {
      if (result->tm_isdst > 0) diff -= 3600;  //daylight is active for THIS file
   }
#endif
   if (toUTC) {
      return dateTime.addSecs(diff);
   } else {
      return dateTime.addSecs(-diff);
   }
}

//----------------------------------------------------------------------------

inline QDateTime getAsUTC(QDateTime &dateTime, bool hasDSTBug) {
   return convertTimeZone(dateTime, hasDSTBug, TRUE);
}

//----------------------------------------------------------------------------

inline QDateTime getAsLocal(QDateTime &dateTime, bool hasDSTBug) {
   return convertTimeZone(dateTime, hasDSTBug, FALSE);
}

#endif