/*****************************************************************************
 * 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:
    typedef Gempa::CAPS::Time INT_TIME;

  private:
    INT_TIME itime;
    int ticks;
    int corr;

  public:
    const int freqn;
    const int freqd;

    SPClock(int freqn_init, int freqd_init): ticks(0), corr(0),
      freqn(freqn_init), freqd(freqd_init)
      {}

    void sync_time(const INT_TIME &time)
      {
        itime = time;
        ticks = 0;
        corr = 0;
      }

    void tick()
      {
        ++ticks;
      }

    INT_TIME get_time(int tick_diff) const
      {
        int64_t correctness = (double)freqd / (double)freqn * 1000000 * (ticks - tick_diff - corr);
        return itime + Gempa::CAPS::TimeSpan(long(correctness/1000000),long(correctness%1000000));
      }

    int correction() const
      {
        return corr;
      }
  };


}
}


#endif // SPCLOCK_H