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// $Header: /bes/bes/BossCvs/Calibration/facilities/facilities/Timestamp.h,v 1.1.1.1 2005/10/17 06:11:40 maqm Exp $
#ifndef FACILITIES_TIMESTAMP_H
#define FACILITIES_TIMESTAMP_H

#include <string>

namespace facilities {

  class BadTimeInput {
  public:
    BadTimeInput(std::string msg) : complaint(msg) {};
    ~BadTimeInput() {};
    std::string complaint; 

    BadTimeInput(const BadTimeInput &other) {complaint = other.complaint; };
  }; 


  class Timestamp {
  public:
    Timestamp();

    Timestamp(long int seconds, int nano = 0, int tzOffset = 0);

    Timestamp(double julian);


    Timestamp(const std::string& str, int tzOffset = 0);

    Timestamp(int year, int month, int day, 
              int hour = 0, int minute = 0, 
              int second = 0, int nano = 0);

    std::string getString() const;

    double      getJulian() const;

    double      getNano() const {return m_nano;}
    long int    getClibTime() const {return m_time;}

    bool operator<(const Timestamp& other) const {
      return ((m_time < other.m_time) || 
              ((m_time == other.m_time) && (m_nano < other.m_nano)));
    }

    bool operator>(const Timestamp& other) const {
      return (other < (*this));
        
    }

    bool operator<=(const Timestamp& other) const {
      return ( !(other < (*this)) );
    }

    bool operator>=(const Timestamp& other) const {
      return ( !( (*this) < other ) );
    }


    Timestamp& operator= (const Timestamp& other) {
      m_time = other.m_time; m_nano = other.m_nano; 
      return *this;
    }

    bool operator==(const Timestamp& other) const{
      return ((m_time == other.m_time) && (m_nano == other.m_nano));
    }

    bool operator!=(const Timestamp& other) const {
      return (!(*this == other));
    }

    //             << (for debugging)
  private:
    // See the U.S. Naval Observatory site, 
    //   http://aa.usno.navy.mil/data/docs/JulianDate.html,
    // used to compute Julian date for Jan 1, 1970
    static const double julian1970;
    static const int    secPerDay;
    static const double  inverseNano;
    static const int     inverseNanoInt;
    static const long int maxInt;

    class TZOffset {
    public:
      TZOffset();          
      long int m_tzseconds;     // 0 for GMT, 28800 for PDT, etc.
      int      m_isDst;   // Not yet sure if we need it
    };
    static  TZOffset s_tz;

    static time_t toBinary(const std::string& strTime); 

    static void toString(time_t bin, std::string& strTime);

  protected:
    time_t m_time;

    int  m_nano;
  };

}

#endif

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