/** @file
 *
 *  A brief file description
 *
 *  @section license License
 *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#pragma once

#include "QUICStream.h"

class QUICBidirectionalStream : public QUICStreamVConnection, public QUICTransferProgressProvider
{
public:
  QUICBidirectionalStream(QUICRTTProvider *rtt_provider, QUICConnectionInfoProvider *cinfo, QUICStreamId sid,
                          uint64_t recv_max_stream_data, uint64_t send_max_stream_data);
  QUICBidirectionalStream()
    : QUICStreamVConnection(),
      _remote_flow_controller(0, 0),
      _local_flow_controller(nullptr, 0, 0),
      _state(nullptr, nullptr, nullptr, nullptr)
  {
  }

  ~QUICBidirectionalStream() {}

  int state_stream_open(int event, void *data);
  int state_stream_closed(int event, void *data);

  // QUICFrameGenerator
  bool will_generate_frame(QUICEncryptionLevel level, size_t current_packet_size, bool ack_eliciting, uint32_t seq_num) override;
  QUICFrame *generate_frame(uint8_t *buf, QUICEncryptionLevel level, uint64_t connection_credit, uint16_t maximum_frame_size,
                            size_t current_packet_size, uint32_t seq_num) override;

  virtual QUICConnectionErrorUPtr recv(const QUICStreamFrame &frame) override;
  virtual QUICConnectionErrorUPtr recv(const QUICMaxStreamDataFrame &frame) override;
  virtual QUICConnectionErrorUPtr recv(const QUICStreamDataBlockedFrame &frame) override;
  virtual QUICConnectionErrorUPtr recv(const QUICStopSendingFrame &frame) override;
  virtual QUICConnectionErrorUPtr recv(const QUICRstStreamFrame &frame) override;

  // Implement VConnection Interface.
  VIO *do_io_read(Continuation *c, int64_t nbytes = INT64_MAX, MIOBuffer *buf = 0) override;
  VIO *do_io_write(Continuation *c = nullptr, int64_t nbytes = INT64_MAX, IOBufferReader *buf = 0, bool owner = false) override;
  void do_io_close(int lerrno = -1) override;
  void do_io_shutdown(ShutdownHowTo_t howto) override;
  void reenable(VIO *vio) override;

  void stop_sending(QUICStreamErrorUPtr error) override;
  void reset(QUICStreamErrorUPtr error) override;

  // QUICTransferProgressProvider
  bool is_transfer_goal_set() const override;
  uint64_t transfer_progress() const override;
  uint64_t transfer_goal() const override;
  bool is_cancelled() const override;

  /*
   * QUICApplication need to call one of these functions when it process VC_EVENT_*
   */
  virtual void on_read() override;
  virtual void on_eos() override;

  QUICOffset largest_offset_received() const override;
  QUICOffset largest_offset_sent() const override;

private:
  QUICStreamErrorUPtr _reset_reason        = nullptr;
  bool _is_reset_sent                      = false;
  QUICStreamErrorUPtr _stop_sending_reason = nullptr;
  bool _is_stop_sending_sent               = false;

  bool _is_transfer_complete = false;
  bool _is_reset_complete    = false;

  QUICTransferProgressProviderVIO _progress_vio = {this->_write_vio};

  QUICRemoteStreamFlowController _remote_flow_controller;
  QUICLocalStreamFlowController _local_flow_controller;
  uint64_t _flow_control_buffer_size = 1024;

  // Fragments of received STREAM frame (offset is unmatched)
  // TODO: Consider to replace with ts/RbTree.h or other data structure
  QUICIncomingStreamFrameBuffer _received_stream_frame_buffer;

  // FIXME Unidirectional streams should use either ReceiveStreamState or SendStreamState
  QUICBidirectionalStreamStateMachine _state;

  // QUICFrameGenerator
  void _on_frame_acked(QUICFrameInformationUPtr &info) override;
  void _on_frame_lost(QUICFrameInformationUPtr &info) override;
};