/****************************************************************************

** libebml : parse EBML files, see http://embl.sourceforge.net/

**

** <file/class description>

**

** Copyright (C) 2002-2010 Steve Lhomme.  All rights reserved.

**

** This library is free software; you can redistribute it and/or

** modify it under the terms of the GNU Lesser General Public

** License as published by the Free Software Foundation; either

** version 2.1 of the License, or (at your option) any later version.

**

** This library 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

** Lesser General Public License for more details.

**

** You should have received a copy of the GNU Lesser General Public

** License along with this library; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

**

** See http://www.gnu.org/licenses/lgpl-2.1.html for LGPL licensing information.

**

** Contact license@matroska.org if any conditions of this licensing are

** not clear to you.

**

**********************************************************************/

/*!

  \file

  \version \$Id$

  \author Steve Lhomme     <robux4 @ users.sf.net>

*/

#ifndef LIBEBML_DATE_H

#define LIBEBML_DATE_H

#include "EbmlTypes.h"

#include "EbmlElement.h"

namespace libebml {

/*!

    \class EbmlDate

    \brief Handle all operations related to an EBML date

*/

class EBML_DLL_API EbmlDate : public EbmlElement {

  public:

    EbmlDate() :EbmlElement(8, false) {}

    EbmlDate(const EbmlDate & ElementToClone);

    /*!

      \brief set the date with a UNIX/C/EPOCH form

      \param NewDate UNIX/C date in UTC (no timezone)

    */

    void SetEpochDate(int64 NewDate) {myDate = (NewDate - UnixEpochDelay) * 1000000000; SetValueIsSet();}

    EbmlDate &SetValue(int64 NewValue) {SetEpochDate(NewValue); return *this;}

    /*!

      \brief get the date with a UNIX/C/EPOCH form

      \note the date is in UTC (no timezone)

    */

    int64 GetEpochDate() const {return static_cast<int64>(myDate/1000000000 + UnixEpochDelay);}

    int64 GetValue() const {return GetEpochDate();}

    bool ValidateSize() const override {return IsFiniteSize() && ((GetSize() == 8) || (GetSize() == 0));}

    /*!

      \note no Default date handled

    */

    filepos_t UpdateSize(bool /* bWithDefault = false */, bool /* bForceRender = false */) override {

      if(!ValueIsSet())

        SetSize_(0);

      else

        SetSize_(8);

      return GetSize();

    }

    bool IsSmallerThan(const EbmlElement *Cmp) const override;

    filepos_t ReadData(IOCallback & input, ScopeMode ReadFully = SCOPE_ALL_DATA) override;

    bool IsDefaultValue() const override {

      return false;

    }

#if defined(EBML_STRICT_API)

    private:

#else

    protected:

#endif

    filepos_t RenderData(IOCallback & output, bool bForceRender, bool bWithDefault = false) override;

    int64 myDate{0}; ///< internal format of the date

    static const uint64 UnixEpochDelay = 978307200; // 2001/01/01 00:00:00 UTC

};

} // namespace libebml

#endif // LIBEBML_DATE_H