// processclock.h :
//

#if !defined(AGD_PROCESSCLOCK_H__20BF9E10_0AB6_4173_B84C_B006ED1C9A76__INCLUDED_)
#define AGD_PROCESSCLOCK_H__20BF9E10_0AB6_4173_B84C_B006ED1C9A76__INCLUDED_

#include <time.h>
#include <stdint.h>
#include <string.h>
#include <string>

#define _PC_NS_PER_US					1000LL	// nanoseconds per microsecond
#define _PC_US_PER_MS					1000LL	// microseconds per millisecond
#define _PC_MS_PER_S					1000LL	// milliseconds per second

#define _PC_NS_PER_MS					(_PC_US_PER_MS * _PC_NS_PER_US)					// nanoseconds per millisecond
#define _PC_NS_PER_S					(_PC_MS_PER_S * _PC_US_PER_MS * _PC_NS_PER_US)	// nanoseconds per second
#define _PC_US_PER_S					(_PC_MS_PER_S * _PC_US_PER_MS)					// microseconds per second

#define _PC_NUM_STOPCLOCKS				8

typedef long long int					pc_time64_t;


#ifdef __cplusplus
/////////////////////////////////////////////////////////////////////////////
// processclock.h - Declarations:

class CProcessClock
{
public:
	typedef enum
	{
		SR_Ok,
		SR_TimerUnderrun,
		SR_Interrupt,
		SR_Error
	}
	SleepResult;

typedef struct _STOPCLOCK
{
	struct timespec tsStopclock;
#if 0
	pc_time64_t nMinElapsed;
	pc_time64_t nMaxElapsed;
#endif
}STOPCLOCK, *LPSTOPCLOCK;
typedef const STOPCLOCK *LPCSTOPCLOCK;

/////////////////////////////////////////////////////////////////////////////

public:
	CProcessClock(bool bInitAtConstr = false);
	virtual ~CProcessClock(void);

	static pc_time64_t GetNanoTick(struct timespec *pts = NULL);

	inline static pc_time64_t GetMicroTick(struct timespec *pts = NULL){
		return GetNanoTick(pts) / _PC_NS_PER_US;
	}

	inline static pc_time64_t GetMilliTick(struct timespec *pts = NULL){
		return GetNanoTick(pts) / _PC_NS_PER_MS;
	}

	inline static pc_time64_t Timespec2NanoSec(const struct timespec *pts){
		return (pc_time64_t)pts->tv_sec * _PC_NS_PER_S + (pc_time64_t)pts->tv_nsec;
	}

	inline static void NanoSec2Timespec(pc_time64_t n, struct timespec *pts){
		if(pts){
			pts->tv_sec	 = (time_t)(n / _PC_NS_PER_S);
			pts->tv_nsec = (time_t)(n % _PC_NS_PER_S);
		}
	}

	inline static pc_time64_t CompareTimespec(const struct timespec *pts1, const struct timespec *pts2){
		pc_time64_t n1 = Timespec2NanoSec(pts1);
		pc_time64_t n2 = Timespec2NanoSec(pts2);
		return n1 - n2;
	}
	
	static std::string Interval2String(pc_time64_t nInterval);

	SleepResult NSleep(pc_time64_t nInterval, bool bResumeOnIntr = true);			// interval in nanoseconds

	inline SleepResult USleep(pc_time64_t nInterval, bool bResumeOnIntr = true){	// interval in microseconds
		return NSleep(nInterval * _PC_NS_PER_US, bResumeOnIntr);
	}

	SleepResult MSleep(pc_time64_t nInterval, bool bResumeOnIntr = true){			// interval in milliseconds
		return NSleep(nInterval * _PC_NS_PER_MS, bResumeOnIntr);
	}
	
	SleepResult Sleep(pc_time64_t nInterval, bool bResumeOnIntr = true){			// interval in seconds
		return NSleep(nInterval * _PC_NS_PER_S, bResumeOnIntr);
	}

    inline pc_time64_t ClockTrigger(unsigned int nClockIndex = 0){
		if(nClockIndex >= _PC_NUM_STOPCLOCKS)
			return -1;
		return GetNanoTick(&m_sc[nClockIndex].tsStopclock);
	}

	pc_time64_t ClockGetElapsed(unsigned int nClockIndex = 0) const;
	inline std::string ClockGetElapsedAsString(unsigned int nClockIndex = 0) const {
		return Interval2String(ClockGetElapsed(nClockIndex));
	}

	void StopclockReset(unsigned int nClockIndex = 0){
		if(nClockIndex < _PC_NUM_STOPCLOCKS){
			memset(&m_sc[nClockIndex].tsStopclock, 0, sizeof(struct timespec));
		}
	}

private:
	inline pc_time64_t IncTime(struct timespec *pts, pc_time64_t ns) const {
		pc_time64_t n = Timespec2NanoSec(pts);
		n += ns;
		NanoSec2Timespec(n, pts);
		return n;
	}

private:
	struct timespec m_tsDueTime;
	STOPCLOCK m_sc[_PC_NUM_STOPCLOCKS];
	bool m_bIsInit;
};

/////////////////////////////////////////////////////////////////////////////
#endif	//	__cplusplus
#endif	//	!defined(AGD_PROCESSCLOCK_H__20BF9E10_0AB6_4173_B84C_B006ED1C9A76__INCLUDED_)