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============================================================ */


#include <iostream>
#include <iomanip>
#include <string>
#include <vector>
#include <omp.h>
#include "Timer.h"
#include "Params.h"

using std::cout;
using std::cerr;
using std::endl;
using std::setw;
using std::string;

/////////////////////////////////////////////////////////////////
// Macros 
/////////////////////////////////////////////////////////////////

#define FREE(ptr, free_val) \
    if (ptr != free_val)    \
    {                       \
        free(ptr);          \
        ptr = free_val;     \
    }

/////////////////////////////////////////////////////////////////
// Globals
/////////////////////////////////////////////////////////////////

struct hostBufferStruct
{
    float * pInput;
    float * pFilter;
    float * pOutputCPU;
} hostBuffers;

struct timerStruct
{
    double dCpuTime;
    CPerfCounter counter;
} timers;

/////////////////////////////////////////////////////////////////
// Host buffers
/////////////////////////////////////////////////////////////////

void InitHostBuffers()
{
    hostBuffers.pInput  = NULL;
    hostBuffers.pOutputCPU = NULL;

    /////////////////////////////////////////////////////////////////
    // Allocate and initialize memory used by host 
    /////////////////////////////////////////////////////////////////
    int sizeInBytes = params.nInWidth * params.nInHeight * sizeof(float);
    hostBuffers.pInput = (float *) malloc(sizeInBytes);
    if (!hostBuffers.pInput) 
        throw(string("InitHostBuffers()::Could not allocate memory"));

    int sizeOutBytes = params.nWidth * params.nHeight * sizeof(float);
    hostBuffers.pOutputCPU = (float *) malloc(sizeOutBytes);
    if (!hostBuffers.pOutputCPU) 
        throw(string("InitHostBuffers()::Could not allocate memory"));

    int filterSizeBytes = params.nFilterWidth * params.nFilterWidth * sizeof(float);
    hostBuffers.pFilter = (float *) malloc(filterSizeBytes);
    if (!hostBuffers.pFilter) 
        throw(string("InitHostBuffers()::Could not allocate memory"));

    srand(0);
    #pragma omp parallel for num_threads(DEFAULT_NUM_THREADS)
    for (int i = 0; i < params.nInWidth * params.nInHeight; i++)
    {
        hostBuffers.pInput[i] = float(rand());
    }

    double dFilterSum = 0;
    int nFilterSize = params.nFilterWidth*params.nFilterWidth;
    for (int i = 0; i < nFilterSize; i++)
    {
        hostBuffers.pFilter[i] = float(rand());
        dFilterSum += hostBuffers.pFilter[i];
    }
    for (int i = 0; i < nFilterSize; i++)
        hostBuffers.pFilter[i] /= dFilterSum;
}

void ClearBuffer(float * pBuf)
{
    #pragma omp parallel for num_threads(DEFAULT_NUM_THREADS)
    for (int i = 0; i < params.nWidth*params.nHeight; i++)
    {
        pBuf[i] = -999.999f;
    }
}

void ReleaseHostBuffers()
{
    FREE(hostBuffers.pInput, NULL);
    FREE(hostBuffers.pOutputCPU, NULL);
    FREE(hostBuffers.pFilter, NULL);
}

/////////////////////////////////////////////////////////////////
// Convolution on CPU 
/////////////////////////////////////////////////////////////////

void Convolve(float * pInput, float * pFilter, float * pOutput,
          const int nInWidth, const int nWidth, const int nHeight,
          const int nFilterWidth, const int nNumThreads)
{
    #pragma omp parallel for num_threads(nNumThreads)
    for (int yOut = 0; yOut < nHeight; yOut++)
    {
        const int yInTopLeft = yOut;

        for (int xOut = 0; xOut < nWidth; xOut++)
        {
            const int xInTopLeft = xOut;

            float sum = 0;
            for (int r = 0; r < nFilterWidth; r++)
            {
                const int idxFtmp = r * nFilterWidth;

                const int yIn = yInTopLeft + r;
                const int idxIntmp = yIn * nInWidth + xInTopLeft;

                for (int c = 0; c < nFilterWidth; c++)
                {
                    const int idxF  = idxFtmp  + c;
                    const int idxIn = idxIntmp + c;    
                    sum += pFilter[idxF]*pInput[idxIn];
                }
            } //for (int r = 0...

            const int idxOut = yOut * nWidth + xOut;
            pOutput[idxOut] = sum;

        } //for (int xOut = 0...
    } //for (int yOut = 0...
}

void RunCPU(int run)
{
    if (params.bCPUTiming)
    {
        cout << "\n********    Starting CPU (" << params.ompThreads[run]
             << "-threads) run    ********" << endl;

        timers.counter.Reset();
        timers.counter.Start();

        for (int i = 0; i < params.nIterations; i++)
            Convolve(hostBuffers.pInput, hostBuffers.pFilter, hostBuffers.pOutputCPU,
                        params.nInWidth,
                        params.nWidth, params.nHeight, 
                        params.nFilterWidth,
                        params.ompThreads[run]);

        timers.counter.Stop();
        timers.dCpuTime = timers.counter.GetElapsedTime()/double(params.nIterations);
    }
}

/////////////////////////////////////////////////////////////////
// Print info, timing 
/////////////////////////////////////////////////////////////////

void PrintInfo()
{
    cout << endl;
    cout << "Width:          " << params.nWidth << endl;
    cout << "Height:         " << params.nHeight << endl;
    cout << "Filter Size:    " << params.nFilterWidth << " x "
                                << params.nFilterWidth << endl;
    cout << "Iterations:     " << params.nIterations << endl;
    cout << "CPU Timing:     " << (params.bCPUTiming ? "True":"False") << endl;
    cout << "Testing:        ";

    if (params.bCPUTiming)
        for (int run = 0; run < params.nOmpRuns; run++)
            cout << "CPU (" << params.ompThreads[run] << "-threads) , ";

    cout << endl << endl;
}

void PrintCPUTime(int run)
{
    if (params.bCPUTiming)
        cout << "CPU (" << params.ompThreads[run] << "-threads): " << timers.dCpuTime << endl;
}

/////////////////////////////////////////////////////////////////
// Main 
/////////////////////////////////////////////////////////////////

int main(int argc, char * argv[])
{
    try
    {
        InitParams(argc, argv);
        PrintInfo();

        InitHostBuffers();

        for (int run = 0; run < params.nOmpRuns; run++)
        {
            ClearBuffer(hostBuffers.pOutputCPU);
            RunCPU(run);
            PrintCPUTime(run);
        }

        ReleaseHostBuffers();
    }
    catch(std::string msg)
    {
        cerr << "Exception caught in main(): " << msg << endl;
        ReleaseHostBuffers();
		return -1;
    }
    catch(...)
    {
        cerr << "Exception caught in main()" << endl;
        ReleaseHostBuffers();
		return -1;
    }

    return 0;
}
