/*
 *  karecurrence.h  -  recurrence with special yearly February 29th handling
 *  Program:  kalarm
 *  Copyright © 2005,2006 by David Jarvie <software@astrojar.org.uk>
 *
 *  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.
 *
 *  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 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.
 */

#ifndef KARECURRENCE_H
#define KARECURRENCE_H

#include <libkcal/recurrence.h>
class DateTime;


class KARecurrence : public KCal::Recurrence
{
	public:
		/** The recurrence's period type.
		 *  This is a subset of the possible KCal recurrence types.
		 */
		enum Type {
			NO_RECUR,      // does not recur
			MINUTELY,      // at an hours/minutes interval
			DAILY,         // daily
			WEEKLY,        // weekly, on specified weekdays
			MONTHLY_POS,   // monthly, on specified weekdays in a specified week of the month
			MONTHLY_DAY,   // monthly, on a specified day of the month
			ANNUAL_DATE,   // yearly, on a specified date in each of the specified months
			ANNUAL_POS     // yearly, on specified weekdays in the specified weeks of the specified months
		};
		/** The date on which a yearly February 29th recurrence falls in non-leap years */
		enum Feb29Type {
			FEB29_FEB29,    // February 29th recurrences are omitted in non-leap years
			FEB29_MAR1,     // February 29th recurrences are on March 1st in non-leap years
			FEB29_FEB28     // February 29th recurrences are on February 28th in non-leap years
		};

		KARecurrence() : KCal::Recurrence(), mFeb29Type(FEB29_FEB29), mCachedType(-1) { }
		KARecurrence(const KCal::Recurrence& r) : KCal::Recurrence(r) { fix(); }
		KARecurrence(const KARecurrence& r) : KCal::Recurrence(r), mFeb29Type(r.mFeb29Type), mCachedType(r.mCachedType) { }
		bool        set(const TQString& icalRRULE);
		bool        set(Type t, int freq, int count, const DateTime& start, const TQDateTime& end)
		                        { return set(t, freq, count, -1, start, end); }
		bool        set(Type t, int freq, int count, const DateTime& start, const TQDateTime& end, Feb29Type f29)
		                        { return set(t, freq, count, f29, start, end); }
		bool        init(KCal::RecurrenceRule::PeriodType t, int freq, int count, const DateTime& start, const TQDateTime& end)
		                        { return init(t, freq, count, -1, start, end); }
		bool        init(KCal::RecurrenceRule::PeriodType t, int freq, int count, const DateTime& start, const TQDateTime& end, Feb29Type f29)
		                        { return init(t, freq, count, f29, start, end); }
		void        fix();
		void        writeRecurrence(KCal::Recurrence&) const;
		TQDateTime  endDateTime() const;
		TQDate      endDate() const;
		bool        recursOn(const TQDate&) const;
		TQDateTime  getNextDateTime(const TQDateTime& preDateTime) const;
		TQDateTime  getPreviousDateTime(const TQDateTime& afterDateTime) const;
		int         longestInterval() const;
		Type        type() const;
		static Type type(const KCal::RecurrenceRule*);
		static bool dailyType(const KCal::RecurrenceRule*);
		Feb29Type   feb29Type() const                 { return mFeb29Type; }
		static Feb29Type defaultFeb29Type()           { return mDefaultFeb29; }
		static void setDefaultFeb29Type(Feb29Type t)  { mDefaultFeb29 = t; }

	private:
		bool        set(Type, int freq, int count, int feb29Type, const DateTime& start, const TQDateTime& end);
		bool        init(KCal::RecurrenceRule::PeriodType, int freq, int count, int feb29Type, const DateTime& start, const TQDateTime& end);
		int         combineDurations(const KCal::RecurrenceRule*, const KCal::RecurrenceRule*, TQDate& end) const;
		int         longestWeeklyInterval(const TQBitArray& days, int frequency);

		static Feb29Type mDefaultFeb29;
		Feb29Type   mFeb29Type;       // yearly recurrence on Feb 29th (leap years) / Mar 1st (non-leap years)
		mutable int mCachedType;
};

#endif // KARECURRENCE_H