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#pragma once
#ifndef CMTIMER_H
#define CMTIMER_H

#include "kyheader.h"

class CmTimer
{
public:
    CmTimer(CStr t):title(t) { is_started = false; start_clock = 0; cumulative_clock = 0; n_starts = 0; }

    ~CmTimer(){	if (is_started) printf("CmTimer '%s' is started and is being destroyed.\n", title.c_str());	}

    inline void Start();
    inline void Stop();
    inline void Reset();

    inline bool Report();
    inline bool StopAndReport() { Stop(); return Report(); }
    inline float TimeInSeconds();

private:
    CStr title;

    bool is_started;
    clock_t start_clock;
    clock_t cumulative_clock;
    unsigned int n_starts;
};

/************************************************************************/
/*                       Implementations                                */
/************************************************************************/

void CmTimer::Start()
{
    if (is_started){
        printf("CmTimer '%s' is already started. Nothing done.\n", title.c_str());
        return;
    }

    is_started = true;
    n_starts++;
    start_clock = clock();
}

void CmTimer::Stop()
{
    if (!is_started){
        printf("CmTimer '%s' is started. Nothing done\n", title.c_str());
        return;
    }

    cumulative_clock += clock() - start_clock;
    is_started = false;
}

void CmTimer::Reset()
{
    if (is_started)	{
        printf("CmTimer '%s'is started during reset request.\n Only reset cumulative time.\n", title.c_str());
        return;
    }
    cumulative_clock = 0;
}

bool CmTimer::Report()
{
    if (is_started){
        printf("CmTimer '%s' is started.\n Cannot provide a time report.", title.c_str());
        return false;
    }

    float timeUsed = TimeInSeconds();
    printf("[%s] CumuTime: %gs, #run: %d, AvgTime: %gs\n", title.c_str(), timeUsed, n_starts, timeUsed/n_starts);
    return true;
}

float CmTimer::TimeInSeconds()
{
    if (is_started){
        printf("CmTimer '%s' is started. Nothing done\n", title.c_str());
        return 0;
    }
    return float(cumulative_clock) / CLOCKS_PER_SEC;
}

#endif // CMTIMER_H
