timezonerule.h

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/***************************************************************************
                          timezonerule.h  -  description
                             -------------------
    begin                : Tue Apr 2 2002
    copyright            : (C) 2002 by Jason Harris
    email                : kstars@30doradus.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef TIMEZONERULE_H_
#define TIMEZONERULE_H_

#include <QString>
#include "kstarsdatetime.h"

class TimeZoneRule {
public:
    TimeZoneRule();

    TimeZoneRule( const QString &smonth, const QString &sday, const QTime &stime,
                  const QString &rmonth, const QString &rday, const QTime &rtime, const double &offset=1.00 );

    bool isDSTActive( const KStarsDateTime &date );

    bool isEmptyRule() { return ( HourOffset == 0.0 ); }

    void setDST( bool activate=true );

    double deltaTZ() const { return dTZ; }

    void reset_with_ltime( KStarsDateTime &ltime, const double TZoffset, const bool time_runs_forward,
                           const bool automaticDSTchange = false );

    KStarsDateTime nextDSTChange() { return next_change_utc; }

    KStarsDateTime nextDSTChange_LTime() { return next_change_ltime; }

    bool equals( TimeZoneRule *r );

private:

    void nextDSTChange_LTime( const KStarsDateTime &date );

    void previousDSTChange_LTime( const KStarsDateTime &date );

    void nextDSTChange( const KStarsDateTime &local_date, const double TZoffset );

    void previousDSTChange( const KStarsDateTime &local_date, const double TZoffset );

    int initMonth( const QString &m );

    void setEmpty();

    bool initDay( const QString &d, int &day, int &week );

    int findStartDay( const KStarsDateTime &d );

    int findRevertDay( const KStarsDateTime &d );

    int   StartDay,   RevertDay;
    int   StartMonth, RevertMonth;
    int   StartWeek , RevertWeek;
    QTime StartTime,  RevertTime;
    KStarsDateTime next_change_utc;
    KStarsDateTime next_change_ltime;
    double dTZ;
    double HourOffset;
};

#endif