/*
 * Copyright (c) 2021 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/callbacks.h>
#include <hicn/transport/interfaces/socket_producer.h>
#include <hicn/transport/interfaces/statistics.h>
#include <hicn/transport/utils/object_pool.h>
#include <implementation/socket.h>
#include <protocols/fec_base.h>
#include <protocols/fec_utils.h>
#include <protocols/protocol.h>
#include <utils/content_store.h>

#include <atomic>
#include <thread>

namespace transport {

namespace protocol {

using namespace core;

class ProductionProtocol
    : public Protocol,
      public std::enable_shared_from_this<ProductionProtocol> {
 public:
  ProductionProtocol(implementation::ProducerSocket *icn_socket);
  virtual ~ProductionProtocol();

  virtual int start();
  using Protocol::stop;

  virtual void setProducerParam(){};

  virtual void produce(ContentObject &content_object);
  virtual void sendMapme();
  virtual uint32_t produceStream(const Name &content_name,
                                 std::unique_ptr<utils::MemBuf> &&buffer,
                                 bool is_last = true,
                                 uint32_t start_offset = 0) = 0;
  virtual uint32_t produceStream(const Name &content_name,
                                 const uint8_t *buffer, size_t buffer_size,
                                 bool is_last = true,
                                 uint32_t start_offset = 0) = 0;
  virtual uint32_t produceDatagram(const Name &content_name,
                                   std::unique_ptr<utils::MemBuf> &&buffer) = 0;
  virtual uint32_t produceDatagram(const Name &content_name,
                                   const uint8_t *buffer,
                                   size_t buffer_size) = 0;

  void setOutputBufferSize(std::size_t size) { output_buffer_.setLimit(size); }
  std::size_t getOutputBufferSize() { return output_buffer_.getLimit(); }

 protected:
  // Producer callback
  virtual void onInterest(core::Interest &i) override = 0;
  virtual void onError(const std::error_code &ec) override;

  template <typename FECHandler, typename AllocatorHandler>
  void enableFEC(FECHandler &&fec_handler,
                 AllocatorHandler &&allocator_handler) {
    if (!fec_encoder_) {
      // Try to get FEC from environment
      const char *fec_str = std::getenv("TRANSPORT_FEC_TYPE");
      if (fec_str && (fec_type_ == fec::FECType::UNKNOWN)) {
        LOG(INFO) << "Using FEC " << fec_str;
        fec_type_ = fec::FECUtils::fecTypeFromString(fec_str);
        CHECK(fec_type_ != fec::FECType::UNKNOWN);
      }

      if (fec_type_ == fec::FECType::UNKNOWN) {
        return;
      }

      fec_encoder_ = fec::FECUtils::getEncoder(fec_type_, 1);
      fec_encoder_->setFECCallback(std::forward<FECHandler>(fec_handler));
      fec_encoder_->setBufferCallback(
          std::forward<AllocatorHandler>(allocator_handler));
    }
  }

 protected:
  implementation::ProducerSocket *socket_;

  // Thread pool responsible for IO operations (send data / receive interests)
  std::vector<utils::EventThread> io_threads_;
  interface::ProductionStatistics *stats_;
  std::unique_ptr<fec::ProducerFEC> fec_encoder_;

  // Callbacks
  interface::ProducerInterestCallback *on_interest_input_;
  interface::ProducerInterestCallback *on_interest_dropped_input_buffer_;
  interface::ProducerInterestCallback *on_interest_inserted_input_buffer_;
  interface::ProducerInterestCallback *on_interest_satisfied_output_buffer_;
  interface::ProducerInterestCallback *on_interest_process_;

  interface::ProducerContentObjectCallback *on_new_segment_;
  interface::ProducerContentObjectCallback *on_content_object_to_sign_;
  interface::ProducerContentObjectCallback *on_content_object_in_output_buffer_;
  interface::ProducerContentObjectCallback *on_content_object_output_;
  interface::ProducerContentObjectCallback
      *on_content_object_evicted_from_output_buffer_;

  interface::ProducerContentCallback *on_content_produced_;

  interface::ProducerSocket::Callback *producer_callback_;

  // Output buffer
  utils::ContentStore output_buffer_;

  // Signature and manifest
  std::shared_ptr<auth::Signer> signer_;
  uint32_t manifest_max_capacity_;

  bool is_async_;
  fec::FECType fec_type_;
};

}  // end namespace protocol
}  // end namespace transport