//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012-2020 OpenVPN Inc.
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU Affero General Public License Version 3
//    as published by the Free Software Foundation.
//
//    This program 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 Affero General Public License for more details.
//
//    You should have received a copy of the GNU Affero General Public License
//    along with this program in the COPYING file.
//    If not, see <http://www.gnu.org/licenses/>.
//

#pragma once

#include <openvpn/asio/scoped_asio_stream.hpp>
#include <openvpn/tun/client/tunbase.hpp>
#include <openvpn/tun/client/tunprop.hpp>
#include <openvpn/tun/persist/tunpersist.hpp>
#include <openvpn/tun/win/client/tunsetup.hpp>

namespace openvpn {
  namespace TunWin {

    // These types manage the underlying TAP driver HANDLE
    typedef openvpn_io::windows::stream_handle TAPStream;
    typedef ScopedAsioStream<TAPStream> ScopedTAPStream;
    struct TunPersistState {
      TunProp::State::Ptr state;
      RingBuffer::Ptr ring_buffer;

      void reset()
      {
	state.reset();
	ring_buffer.reset();
      }
    };
    typedef TunPersistTemplate<ScopedTAPStream, TunPersistState> TunPersist;

    class ClientConfig : public TunClientFactory
    {
      friend class Client; // accesses wfp

    public:
      typedef RCPtr<ClientConfig> Ptr;

      TunProp::Config tun_prop;
      int n_parallel = 8;         // number of parallel async reads on tun socket
      bool wintun = false;

      Frame::Ptr frame;
      SessionStats::Ptr stats;

      Stop* stop = nullptr;

      TunPersist::Ptr tun_persist;

      TunWin::SetupFactory::Ptr tun_setup_factory;

      TunWin::SetupBase::Ptr new_setup_obj(openvpn_io::io_context& io_context)
      {
	if (tun_setup_factory)
	  return tun_setup_factory->new_setup_obj(io_context, wintun);
	else
	  return new TunWin::Setup(io_context, wintun);
      }

      static Ptr new_obj()
      {
	return new ClientConfig;
      }

      virtual TunClient::Ptr new_tun_client_obj(openvpn_io::io_context& io_context,
	TunClientParent& parent,
	TransportClient* transcli) override;

      virtual void finalize(const bool disconnected) override
      {
	if (disconnected)
	  tun_persist.reset();
      }

      virtual bool layer_2_supported() const override
      {
	return true;
      }
    };
  }
}