/*****************************************************************************
 * spclock.h
 *
 * Stream Processor Clock
 *
 * (c) 2000 Andres Heinloo, GFZ Potsdam
 *
 * 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, or (at your option) any later
 * version. For more information, see http://www.gnu.org/
 *
 * ================
 * Change log
 * ===============
 *
 * 01.01.2013 Adapted code to CAPS client library requirements (gempa GmbH)
 *****************************************************************************/


#ifndef CAPS_MSEED_SPCLOCK_H
#define CAPS_MSEED_SPCLOCK_H


#include <gempa/caps/datetime.h>


namespace Gempa {
namespace CAPS {


class SPClock {
	public:
		SPClock(int freqn, int freqd)
		: freqn(freqn), freqd(freqd) {}

		void syncTime(const Time &time) {
			_itime = time;
			_ticks = 0;
			_corr = 0;
		}

		void tick() {
			++_ticks;
		}

		Time getTime(int tickDiff) const {
			int64_t correctness = (double)freqd / (double)freqn * 1000000 * (_ticks - tickDiff - _corr);
			return _itime + TimeSpan(long(correctness / 1000000), long(correctness % 1000000));
		}

		int correction() const {
			return _corr;
		}

	public:
		const int freqn;
		const int freqd;

	private:
		Time _itime;
		int  _ticks{0};
		int  _corr{0};
};


}
}


#endif