/* timeStamp.h */
/**
 * Copyright - See the COPYRIGHT that is included with this distribution.
 * EPICS pvDataCPP is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 */
#ifndef TIMESTAMP_H
#define TIMESTAMP_H
#include "epicsTime.h"
#include "pvType.h"

namespace epics { namespace pvData { 

extern int32 milliSecPerSec;
extern int32 microSecPerSec;
extern int32 nanoSecPerSec;
extern int64 posixEpochAtEpicsEpoch;

class TimeStamp {
public:
    TimeStamp() 
    :secondsPastEpoch(0),nanoSeconds(0) {}
    //default constructors and destructor are OK
    //This class should not be extended
    TimeStamp(int64 secondsPastEpoch,int32 nanoSeconds = 0);
    TimeStamp(epicsTimeStamp &epics);
    int64 getSecondsPastEpoch() const {return secondsPastEpoch;}
    int64 getEpicsSecondsPastEpoch() const {
        return secondsPastEpoch - posixEpochAtEpicsEpoch;
    }
    int32 getNanoSeconds() const  {return nanoSeconds;}
    void put(int64 secondsPastEpoch,int32 nanoSeconds = 0) {
        this->secondsPastEpoch = secondsPastEpoch;
        this->nanoSeconds = nanoSeconds;
    }
    void getCurrent();
    double toSeconds() const ;
    bool operator==(TimeStamp const &) const;
    bool operator!=(TimeStamp const &) const;
    bool operator<=(TimeStamp const &) const;
    bool operator< (TimeStamp const &) const;
    bool operator>=(TimeStamp const &) const;
    bool operator> (TimeStamp const &) const;
    static double diff(TimeStamp const & a,TimeStamp const & b);
    TimeStamp & operator+=(int64 seconds);
    TimeStamp & operator-=(int64 seconds);
    TimeStamp & operator+=(double seconds);
    TimeStamp & operator-=(double seconds);
    // milliseconds since epoch
    int64 getMilliseconds();
    void put(int64 milliseconds);
    
private:
    static int64 diffInt(TimeStamp const &left,TimeStamp const  &right );
    int64 secondsPastEpoch;
    int32 nanoSeconds;
};
  

}}
#endif  /* TIMESTAMP_H */