/*
 *  Copyright 2013 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef P2P_BASE_ASYNC_STUN_TCP_SOCKET_H_
#define P2P_BASE_ASYNC_STUN_TCP_SOCKET_H_

#include <cstddef>
#include <cstdint>
#include <memory>
#include <span>

#include "absl/base/nullability.h"
#include "api/environment/environment.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/async_tcp_socket.h"
#include "rtc_base/socket.h"

namespace webrtc {

class AsyncStunTCPSocket : public AsyncTCPSocketBase {
 public:
  AsyncStunTCPSocket(const Environment& env,
                     absl_nonnull std::unique_ptr<Socket> socket);

  AsyncStunTCPSocket(const AsyncStunTCPSocket&) = delete;
  AsyncStunTCPSocket& operator=(const AsyncStunTCPSocket&) = delete;

  using AsyncPacketSocket::Send;
  using AsyncPacketSocket::SendTo;

  int Send(const void* pv,
           size_t cb,
           const AsyncSocketPacketOptions& options) override;
  size_t ProcessInput(std::span<const uint8_t> data) override;

 private:
  // This method returns the message hdr + length written in the header.
  // This method also returns the number of padding bytes needed/added to the
  // turn message. `pad_bytes` should be used only when `is_turn` is true.
  size_t GetExpectedLength(const void* data, size_t len, int* pad_bytes);

  const Environment env_;
};

}  //  namespace webrtc


#endif  // P2P_BASE_ASYNC_STUN_TCP_SOCKET_H_