/*! \file */
/* ************************************************************************
 * Copyright (c) 2019-2021 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ************************************************************************ */
#ifdef WIN32
#include <windows.h>
#endif
#include "rocsparse_random.hpp"
#include "utility.hpp"

#include <chrono>
#include <cstdlib>

#ifdef WIN32
#define strcasecmp(A, B) _stricmp(A, B)
#endif

#ifdef __cpp_lib_filesystem
#include <filesystem>
#else
#include <experimental/filesystem>

namespace std
{
    namespace filesystem = experimental::filesystem;
}
#endif

// Random number generator
// Note: We do not use random_device to initialize the RNG, because we want
// repeatability in case of test failure. TODO: Add seed as an optional CLI
// argument, and print the seed on output, to ensure repeatability.
rocsparse_rng_t rocsparse_rng(69069);
rocsparse_rng_t rocsparse_rng_nan(69069);
rocsparse_rng_t rocsparse_seed(rocsparse_rng);

void rocsparse_rng_set(rocsparse_rng_t a)
{
    rocsparse_rng = a;
}

void rocsparse_seed_set(rocsparse_rng_t a)
{
    rocsparse_seed = a;
}

void rocsparse_rng_nan_set(rocsparse_rng_t a)
{
    rocsparse_rng_nan = a;
}

rocsparse_rng_t& rocsparse_rng_get()
{
    return rocsparse_rng;
}

rocsparse_rng_t& rocsparse_seed_get()
{
    return rocsparse_seed;
}

rocsparse_rng_t& rocsparse_rng_nan_get()
{
    return rocsparse_rng_nan;
}

/* ============================================================================================ */
// Return path of this executable
std::string rocsparse_exepath()
{

#ifdef WIN32

    std::vector<TCHAR> result(MAX_PATH + 1);
    // Ensure result is large enough to accomodate the path
    DWORD length = 0;
    for(;;)
    {
        length = GetModuleFileNameA(nullptr, result.data(), result.size());
        if(length < result.size() - 1)
        {
            result.resize(length + 1);
            break;
        }
        result.resize(result.size() * 2);
    }

    std::filesystem::path exepath(result.begin(), result.end());
    exepath = exepath.remove_filename();
    exepath += exepath.empty() ? "" : "/";
    return exepath.string();

#else
    std::string pathstr;
    char*       path = realpath("/proc/self/exe", 0);
    if(path)
    {
        char* p = strrchr(path, '/');
        if(p)
        {
            p[1]    = 0;
            pathstr = path;
        }
        free(path);
    }
    return pathstr;
#endif
}

/* ============================================================================================ */
/*  timing:*/

/*! \brief  CPU Timer(in microsecond): synchronize with the default device and return wall time */
double get_time_us(void)
{
    hipDeviceSynchronize();
    auto now = std::chrono::steady_clock::now();
    // struct timeval tv;
    // gettimeofday(&tv, NULL);
    //  return (tv.tv_sec * 1000 * 1000) + tv.tv_usec;
    auto duration
        = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch()).count();
    return (static_cast<double>(duration));
};

/*! \brief  CPU Timer(in microsecond): synchronize with given queue/stream and return wall time */
double get_time_us_sync(hipStream_t stream)
{
    hipStreamSynchronize(stream);
    auto now = std::chrono::steady_clock::now();

    // struct timeval tv;
    // gettimeofday(&tv, NULL);
    // return (tv.tv_sec * 1000 * 1000) + tv.tv_usec;
    auto duration
        = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch()).count();
    return (static_cast<double>(duration));
};