// MIT License
//
// Copyright (c) 2023 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.

#include "lib/common/environment.hpp"
#include "lib/common/demangle.hpp"

#include <cctype>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <string_view>

namespace rocprofiler
{
namespace common
{
namespace impl
{
std::string
get_env(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};
}

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

bool
get_env(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));
        }

        for(size_t i = 0; i < std::string_view{env_var}.length(); ++i)
            env_var[i] = tolower(env_var[i]);

        for(const auto& itr : {"off", "false", "no", "n", "f", "0"})
            if(std::string_view{env_var} == itr) return false;

        return true;
    }
    return _default;
}

template <typename Tp>
Tp
get_env(std::string_view env_id, Tp _default, std::enable_if_t<std::is_integral<Tp>::value, sfinae>)
{
    static_assert(!std::is_same<Tp, bool>::value, "unexpected! should be using bool overload");
    static_assert(
        sizeof(Tp) <= sizeof(uint64_t),
        "change use of stol/stoul if instantiating for type larger than a 64-bit integer");

    if(env_id.empty()) return _default;
    char* env_var = ::std::getenv(env_id.data());
    if(env_var)
    {
        try
        {
            // use stol/stoul
            if constexpr(std::is_signed<Tp>::value)
                return static_cast<Tp>(std::stol(env_var));
            else
                return static_cast<Tp>(std::stoul(env_var));
        } catch(std::exception& _e)
        {
            LOG(ERROR) << "[rocprofiler][get_env] Exception thrown converting getenv(\"" << env_id
                       << "\") = " << env_var << " to " << cxx_demangle(typeid(Tp).name())
                       << " :: " << _e.what() << ". Using default value of " << _default << "\n";
        }
        return _default;
    }
    return _default;
}

int
set_env(std::string_view env_id, bool value, int override)
{
    return ::setenv(env_id.data(), (value) ? "1" : "0", override);
}

template <typename Tp>
int
set_env(std::string_view env_id, Tp value, int override)
{
    auto str_value = std::stringstream{};
    str_value << value;
    return ::setenv(env_id.data(), str_value.str().c_str(), override);
}

#define SPECIALIZE_GET_ENV(TYPE)                                                                   \
    template TYPE get_env<TYPE>(                                                                   \
        std::string_view, TYPE, std::enable_if_t<std::is_integral<TYPE>::value, sfinae>);          \
    template int set_env<TYPE>(std::string_view, TYPE, int);

#define SPECIALIZE_SET_ENV(TYPE) template int set_env<TYPE>(std::string_view, TYPE, int);

SPECIALIZE_GET_ENV(int8_t)
SPECIALIZE_GET_ENV(int16_t)
SPECIALIZE_GET_ENV(int32_t)
SPECIALIZE_GET_ENV(int64_t)
SPECIALIZE_GET_ENV(uint8_t)
SPECIALIZE_GET_ENV(uint16_t)
SPECIALIZE_GET_ENV(uint32_t)
SPECIALIZE_GET_ENV(uint64_t)

SPECIALIZE_SET_ENV(const char*)
SPECIALIZE_SET_ENV(std::string)
SPECIALIZE_SET_ENV(float)
SPECIALIZE_SET_ENV(double)
}  // namespace impl
}  // namespace common
}  // namespace rocprofiler