// -*- c++ -*-

#ifndef TIME_MEASURE_H

#define TIME_MEASURE_H

#include <sys/time.h>

#include <sys/times.h>

#include <fstream>

#include <iostream>

double currTime() {

  timeval tv;

  //timezone tz;

  gettimeofday(&tv, 0);

  return double(tv.tv_sec)+double(tv.tv_usec)/1000000.0;

}

class TimeStamp

{

  tms ts;

  double real_time;

public:

  tms &getTms() {return ts;}

  const tms &getTms() const {return ts;}

  double getRealTime() const {return real_time;}

  void stamp()

  {

    timeval tv;

    times(&ts);

    gettimeofday(&tv, 0);real_time=tv.tv_sec+double(tv.tv_usec)/1e6;

  }

  TimeStamp()

  { ts.tms_utime=ts.tms_stime=ts.tms_cutime=ts.tms_cstime=0; real_time=0;}

  TimeStamp(void *) { stamp();}

  TimeStamp &operator+=(const TimeStamp &b)

  {

    ts.tms_utime+=b.ts.tms_utime;

    ts.tms_stime+=b.ts.tms_stime;

    ts.tms_cutime+=b.ts.tms_cutime;

    ts.tms_cstime+=b.ts.tms_cstime;

    real_time+=b.real_time;

    return *this;

  }

  TimeStamp operator+(const TimeStamp &b) const

  {

    TimeStamp t(*this);

    return t+=b;

  }

  TimeStamp &operator-=(const TimeStamp &b)

  {

    ts.tms_utime-=b.ts.tms_utime;

    ts.tms_stime-=b.ts.tms_stime;

    ts.tms_cutime-=b.ts.tms_cutime;

    ts.tms_cstime-=b.ts.tms_cstime;

    real_time-=b.real_time;

    return *this;

  }

  TimeStamp operator-(const TimeStamp &b) const

  {

    TimeStamp t(*this);

    return t-=b;

  }

  TimeStamp Ellapsed() const

  {

    TimeStamp t(NULL);

    return t-*this;

  }

  friend std::ostream& operator<<(std::ostream& os,const TimeStamp &t);

  double getUserTime() const

  {

    long cls = sysconf(_SC_CLK_TCK);

    return double(ts.tms_utime)/cls;

  }

  double getSystemTime() const

  {

    long cls = sysconf(_SC_CLK_TCK);

    return double(ts.tms_stime)/cls;

  }

  double getCUserTime() const

  {

    long cls = sysconf(_SC_CLK_TCK);

    return double(ts.tms_cutime)/cls;

  }

  double getCSystemTime() const

  {

    long cls = sysconf(_SC_CLK_TCK);

    return double(ts.tms_cstime)/cls;

  }

};

class Timer

{

  TimeStamp start_time;

public: 

  void reset() {start_time.stamp();}

  Timer() {reset();}

  operator TimeStamp ()

  {

    TimeStamp t;

    t.stamp();

    return t-start_time;

  }  

};

inline std::ostream& operator<<(std::ostream& os,const TimeStamp &t)

{

  long cls = sysconf(_SC_CLK_TCK);

  os << "u: " << double(t.getTms().tms_utime)/cls <<

    "s, s: " << double(t.getTms().tms_stime)/cls <<

    "s, cu: " << double(t.getTms().tms_cutime)/cls <<

    "s, cs: " << double(t.getTms().tms_cstime)/cls <<

    "s, real: " << t.getRealTime() << "s";

  return os;

}

#endif //TIME_MEASURE_H