/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef D_DOWNLOAD_COMMAND_H
#define D_DOWNLOAD_COMMAND_H

#include "AbstractCommand.h"

#include <unistd.h>

namespace aria2 {

class PeerStat;
class StreamFilter;
class MessageDigest;

class DownloadCommand : public AbstractCommand {
private:
  std::shared_ptr<PeerStat> peerStat_;

  std::unique_ptr<StreamFilter> streamFilter_;

  std::unique_ptr<MessageDigest> messageDigest_;

  std::chrono::seconds startupIdleTime_;

  int lowestDownloadSpeedLimit_;

  bool pieceHashValidationEnabled_;

  bool sinkFilterOnly_;

  void validatePieceHash(const std::shared_ptr<Segment>& segment,
                         const std::string& expectedPieceHash,
                         const std::string& actualPieceHash);

  void checkLowestDownloadSpeed() const;

  void completeSegment(cuid_t cuid, const std::shared_ptr<Segment>& segment);

protected:
  virtual bool executeInternal() CXX11_OVERRIDE;

  virtual bool prepareForNextSegment();

  // This is file local offset
  virtual int64_t getRequestEndOffset() const = 0;

  // Returns true if socket should be monitored for writing.  The
  // default implementation is return the return value of
  // getSocket()->wantWrite().
  virtual bool shouldEnableWriteCheck();

public:
  DownloadCommand(cuid_t cuid, const std::shared_ptr<Request>& req,
                  const std::shared_ptr<FileEntry>& fileEntry,
                  RequestGroup* requestGroup, DownloadEngine* e,
                  const std::shared_ptr<SocketCore>& s,
                  const std::shared_ptr<SocketRecvBuffer>& socketRecvBuffer);
  virtual ~DownloadCommand();

  const std::unique_ptr<StreamFilter>& getStreamFilter() const
  {
    return streamFilter_;
  }

  void installStreamFilter(std::unique_ptr<StreamFilter> streamFilter);

  void setStartupIdleTime(std::chrono::seconds startupIdleTime)
  {
    startupIdleTime_ = std::move(startupIdleTime);
  }

  void setLowestDownloadSpeedLimit(int lowestDownloadSpeedLimit)
  {
    lowestDownloadSpeedLimit_ = lowestDownloadSpeedLimit;
  }
};

} // namespace aria2

#endif // D_DOWNLOAD_COMMAND_H