/*
    This file is part of TON Blockchain Library.

    TON Blockchain Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    TON Blockchain Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2017-2020 Telegram Systems LLP
*/
#pragma once

#include "td/utils/port/config.h"

#include "td/utils/common.h"
#include "td/utils/Destructor.h"

#include <memory>
#include <utility>

namespace td {

// clang-format off
#if TD_GCC || TD_CLANG
  #define TD_THREAD_LOCAL __thread
#elif TD_INTEL || TD_MSVC
  #define TD_THREAD_LOCAL thread_local
#else
  #warning "TD_THREAD_LOCAL is not defined, trying 'thread_local'"
  #define TD_THREAD_LOCAL thread_local
#endif
// clang-format on

// If raw_ptr is not nullptr, allocate T as in std::make_unique<T>(args...) and store pointer into raw_ptr
template <class T, class P, class... ArgsT>
bool init_thread_local(P &raw_ptr, ArgsT &&... args);

// Destroy all thread locals, and store nullptr into corresponding pointers
void clear_thread_locals();

void set_thread_id(int32 id);

int32 get_thread_id();

namespace detail {
void add_thread_local_destructor(unique_ptr<Destructor> destructor);

template <class T, class P, class... ArgsT>
void do_init_thread_local(P &raw_ptr, ArgsT &&... args) {
  auto ptr = std::make_unique<T>(std::forward<ArgsT>(args)...);
  raw_ptr = ptr.get();

  detail::add_thread_local_destructor(create_destructor([ptr = std::move(ptr), &raw_ptr]() mutable {
    ptr.reset();
    raw_ptr = nullptr;
  }));
}
}  // namespace detail

template <class T, class P, class... ArgsT>
bool init_thread_local(P &raw_ptr, ArgsT &&... args) {
  if (likely(raw_ptr != nullptr)) {
    return false;
  }
  detail::do_init_thread_local<T>(raw_ptr, std::forward<ArgsT>(args)...);
  return true;
}

}  // namespace td