// MIT License
//
// Copyright (c) 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved.
//
// 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.

#pragma once

#include "common/defines.h"

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <stdexcept>
#include <string>
#include <string_view>
#include <type_traits>
#include <unistd.h>

#if !defined(ROCPROFSYS_ENVIRON_LOG_NAME)
#    if defined(ROCPROFSYS_COMMON_LIBRARY_NAME)
#        define ROCPROFSYS_ENVIRON_LOG_NAME "[" ROCPROFSYS_COMMON_LIBRARY_NAME "]"
#    else
#        define ROCPROFSYS_ENVIRON_LOG_NAME
#    endif
#endif

#if !defined(ROCPROFSYS_ENVIRON_LOG_START)
#    if defined(ROCPROFSYS_COMMON_LIBRARY_LOG_START)
#        define ROCPROFSYS_ENVIRON_LOG_START ROCPROFSYS_COMMON_LIBRARY_LOG_START
#    elif defined(TIMEMORY_LOG_COLORS_AVAILABLE)
#        define ROCPROFSYS_ENVIRON_LOG_START                                             \
            fprintf(stderr, "%s", ::tim::log::color::info());
#    else
#        define ROCPROFSYS_ENVIRON_LOG_START
#    endif
#endif

#if !defined(ROCPROFSYS_ENVIRON_LOG_END)
#    if defined(ROCPROFSYS_COMMON_LIBRARY_LOG_END)
#        define ROCPROFSYS_ENVIRON_LOG_END ROCPROFSYS_COMMON_LIBRARY_LOG_END
#    elif defined(TIMEMORY_LOG_COLORS_AVAILABLE)
#        define ROCPROFSYS_ENVIRON_LOG_END                                               \
            fprintf(stderr, "%s", ::tim::log::color::end());
#    else
#        define ROCPROFSYS_ENVIRON_LOG_END
#    endif
#endif

#define ROCPROFSYS_ENVIRON_LOG(CONDITION, ...)                                           \
    if(CONDITION)                                                                        \
    {                                                                                    \
        fflush(stderr);                                                                  \
        ROCPROFSYS_ENVIRON_LOG_START                                                     \
        fprintf(stderr, "[rocprof-sys]" ROCPROFSYS_ENVIRON_LOG_NAME "[%i] ", getpid());  \
        fprintf(stderr, __VA_ARGS__);                                                    \
        ROCPROFSYS_ENVIRON_LOG_END                                                       \
        fflush(stderr);                                                                  \
    }

namespace rocprofsys
{
inline namespace common
{
namespace
{
inline std::string
get_env_impl(std::string_view env_id, std::string_view _default)
{
    if(env_id.empty()) return std::string{ _default };
    char* env_var = ::std::getenv(env_id.data());
    if(env_var) return std::string{ env_var };
    return std::string{ _default };
}

inline std::string
get_env_impl(std::string_view env_id, const char* _default)
{
    return get_env_impl(env_id, std::string_view{ _default });
}

inline int
get_env_impl(std::string_view env_id, int _default)
{
    if(env_id.empty()) return _default;
    char* env_var = ::std::getenv(env_id.data());
    if(env_var)
    {
        try
        {
            return std::stoi(env_var);
        } catch(std::exception& _e)
        {
            fprintf(stderr,
                    "[rocprof-sys][get_env] Exception thrown converting getenv(\"%s\") = "
                    "%s to integer :: %s. Using default value of %i\n",
                    env_id.data(), env_var, _e.what(), _default);
        }
        return _default;
    }
    return _default;
}

inline bool
get_env_impl(std::string_view env_id, bool _default)
{
    if(env_id.empty()) return _default;
    char* env_var = ::std::getenv(env_id.data());
    if(env_var)
    {
        if(std::string_view{ env_var }.empty())
            throw std::runtime_error(std::string{ "No boolean value provided for " } +
                                     std::string{ env_id });

        if(std::string_view{ env_var }.find_first_not_of("0123456789") ==
           std::string_view::npos)
        {
            return static_cast<bool>(std::stoi(env_var));
        }
        else
        {
            for(size_t i = 0; i < strlen(env_var); ++i)
                env_var[i] = tolower(env_var[i]);
            for(const auto& itr : { "off", "false", "no", "n", "f", "0" })
                if(strcmp(env_var, itr) == 0) return false;
        }
        return true;
    }
    return _default;
}
}  // namespace

template <typename Tp>
inline auto
get_env(std::string_view env_id, Tp&& _default)
{
    if constexpr(std::is_enum<Tp>::value)
    {
        using Up = std::underlying_type_t<Tp>;
        // cast to underlying type -> get_env -> cast to enum type
        return static_cast<Tp>(get_env_impl(env_id, static_cast<Up>(_default)));
    }
    else
    {
        return get_env_impl(env_id, std::forward<Tp>(_default));
    }
}

struct ROCPROFSYS_INTERNAL_API env_config
{
    std::string env_name  = {};
    std::string env_value = {};
    int         override  = 0;

    auto operator()(bool _verbose = false) const
    {
        if(env_name.empty()) return -1;
        ROCPROFSYS_ENVIRON_LOG(_verbose, "setenv(\"%s\", \"%s\", %i)\n", env_name.c_str(),
                               env_value.c_str(), override);
        return setenv(env_name.c_str(), env_value.c_str(), override);
    }
};
}  // namespace common
}  // namespace rocprofsys