/*
    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"

#ifdef TD_PORT_WINDOWS

#include "td/utils/common.h"
#include "td/utils/Context.h"
#include "td/utils/port/detail/NativeFd.h"
#include "td/utils/Status.h"

#include <memory>

namespace td {
namespace detail {

class IocpRef;
class Iocp final : public Context<Iocp> {
 public:
  Iocp() = default;
  Iocp(const Iocp &) = delete;
  Iocp &operator=(const Iocp &) = delete;
  Iocp(Iocp &&) = delete;
  Iocp &operator=(Iocp &&) = delete;
  ~Iocp();

  class Callback {
   public:
    virtual ~Callback() = default;
    virtual void on_iocp(Result<size_t> r_size, WSAOVERLAPPED *overlapped) = 0;
  };

  void init();
  void subscribe(const NativeFd &fd, Callback *callback);
  void post(size_t size, Callback *callback, WSAOVERLAPPED *overlapped);
  void loop();
  void interrupt_loop();
  void clear();

  IocpRef get_ref() const;

 private:
  std::shared_ptr<NativeFd> iocp_handle_;
};

class IocpRef {
 public:
  IocpRef() = default;
  IocpRef(const Iocp &) = delete;
  IocpRef &operator=(const Iocp &) = delete;
  IocpRef(IocpRef &&) = default;
  IocpRef &operator=(IocpRef &&) = default;

  explicit IocpRef(std::weak_ptr<NativeFd> iocp_handle);

  bool post(size_t size, Iocp::Callback *callback, WSAOVERLAPPED *overlapped);

 private:
  std::weak_ptr<NativeFd> iocp_handle_;
};

}  // namespace detail
}  // namespace td

#endif