////////////////////////////////////////////////////////////////////
/// \class RAT::clock
///
/// \brief   Simulate a clock on the digital master trigger card
///
/// \author  Josh Klein <jrk@hep.upenn.edu>
///
/// REVISION HISTORY:\n
///     28 Apr 2010 : Josh Klein --- First version. \n
///     01 May 2010 : Josh Klein --- Fixed bug in clock bit division which
///     causes crashes on some platforms. \n
///     03 May 2010 : Gabriel Orebi Gann - replace `double' with `long
///     double' to avoid loss of precision. \n
///     03 May 2010 : Gabriel Orebi Gann - set fPeriod in SetFrequency function
///     and bug fix in clock bit division. \n
///     07 May 2010 : Gabriel Orebi Gann - remove use of `long doubles' \n
///     07 May 2010 : Gabriel Orebi Gann - add function to get clock time \n
///     12 May 2010 : Gabriel Orebi Gann - inc precision in clock time function \n
///
///
/// \details The clock object is a generic clock that can be either the 50 MHz
///  or 10 MHz clock that sits on the MTC/D. After setup of the frequency and
///  number of bits of each clock, functions allow the MTC/D object to
///  determine the time of the next clock tick, which can then be used to latch
///  the global trigger.  The count on the clock can also be returned for
///  inclusion in the trigger words.
///
//////////////////////////////////////////////////////////////////////

#ifndef __RAT_clock__
#define __RAT_clock__

#include <vector>
#include <RAT/EventTime.hh>
#include <TObject.h>


namespace RAT {


class clock{
public:


  clock();
  virtual ~clock();
  void SetFrequency(double freq);
  void SetNbits(UInt_t nbits){fNbits=nbits;};
  double GetNextTickTime(double time);
  UInt_t GetNbits(){return fNbits;};
  virtual ULong64_t GetCount(){return fCount;};
  virtual ULong64_t GetCount(EventTime date);
  double GetFrequency(){return fFrequency;};
  EventTime GetUTime();
  virtual void SetRolloverInterval();



private:
  double fFrequency; //in Hz
  double fPeriod;
  ULong64_t fCount;
  UInt_t fNbits;
  double fNsecsRollover;
  UInt_t fRolloverDays;
  UInt_t fRolloverSecs;
  double fRolloverNsecs;

};


} // namespace RAT

#endif