/*
 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
 * Licensed 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 <hicn/transport/interfaces/socket_consumer.h>

#include <implementation/socket_consumer.h>

#include <openssl/ssl.h>

namespace transport {
namespace implementation {

class TLSConsumerSocket : public ConsumerSocket,
                          public interface::ConsumerSocket::ReadCallback {
  /* Return the number of read bytes in readbytes */
  friend int readTLS(BIO *b, char *buf, size_t size, size_t *readbytes);

  /* Return the number of read bytes in the return param */
  friend int readOldTLS(BIO *h, char *buf, int size);

  /* Return the number of written bytes in written */
  friend int writeTLS(BIO *b, const char *buf, size_t size, size_t *written);

  /* Return the number of written bytes in the return param */
  friend int writeOldTLS(BIO *h, const char *buf, int num);

  friend long ctrlTLS(BIO *b, int cmd, long num, void *ptr);

 public:
  explicit TLSConsumerSocket(interface::ConsumerSocket *consumer_socket,
                             int protocol, SSL *ssl_);

  ~TLSConsumerSocket();

  int consume(const Name &name, std::unique_ptr<utils::MemBuf> &&buffer);
  int consume(const Name &name) override;

  int asyncConsume(const Name &name, std::unique_ptr<utils::MemBuf> &&buffer);
  int asyncConsume(const Name &name) override;

  void registerPrefix(const Prefix &producer_namespace);

  int setSocketOption(
      int socket_option_key,
      interface::ConsumerSocket::ReadCallback *socket_option_value) override;

  using ConsumerSocket::getSocketOption;
  using ConsumerSocket::setSocketOption;

 protected:
  /* Callback invoked once an interest has been received and its payload
   * decrypted */
  ConsumerInterestCallback on_interest_input_decrypted_;
  ConsumerInterestCallback on_interest_process_decrypted_;

 private:
  Name name_;
  /* SSL handle */
  SSL *ssl_;
  SSL_CTX *ctx_;
  /* Chain of MemBuf to be used as a temporary buffer to pass descypted data
   * from the underlying layer to the application */
  utils::ObjectPool<utils::MemBuf> buf_pool_;
  std::unique_ptr<utils::MemBuf> decrypted_content_;
  /* Chain of MemBuf holding the payload to be written into interest or data */
  std::unique_ptr<utils::MemBuf> payload_;
  /* Chain of MemBuf holding the data retrieved from the underlying layer */
  std::unique_ptr<utils::MemBuf> head_;
  bool something_to_read_;
  bool content_downloaded_;
  uint32_t random_suffix_;
  Prefix producer_namespace_;
  interface::ConsumerSocket::ReadCallback *read_callback_decrypted_;
  std::mutex mtx_;
  /* Condition variable for the wait */
  std::condition_variable cv_;
  utils::EventThread async_downloader_tls_;

  void setInterestPayload(interface::ConsumerSocket &c,
                          const core::Interest &interest);

  virtual void getReadBuffer(uint8_t **application_buffer,
                             size_t *max_length) override;

  virtual void readDataAvailable(size_t length) noexcept override;

  virtual size_t maxBufferSize() const override;

  virtual void readBufferAvailable(
      std::unique_ptr<utils::MemBuf> &&buffer) noexcept override;

  virtual void readError(const std::error_code ec) noexcept override;

  virtual void readSuccess(std::size_t total_size) noexcept override;

  virtual bool isBufferMovable() noexcept override;

  int download_content(const Name &name);
};

}  // namespace implementation
}  // end namespace transport