/* <!-- copyright */
/*
 * aria2 - a simple utility for downloading files faster
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/* copyright --> */
#ifndef _D_TORRENT_DOWNLOAD_ENGINE_H_
#define _D_TORRENT_DOWNLOAD_ENGINE_H_

#include "DownloadEngine.h"
#include "TorrentMan.h"
#include "TimeA2.h"

class TorrentDownloadEngine : public DownloadEngine {
private:
  bool filenameFixed;

  void initStatistics();
  void calculateStatistics();
protected:
  Time cp[2];
  long long int sessionDownloadLengthArray[2];
  long long int sessionUploadLengthArray[2];
  int currentCp;

  int downloadSpeed;
  int uploadSpeed;
  int lastElapsed;
  long long int selectedDownloadLengthDiff;
  long long int selectedTotalLength;
  // The time when startup
  Time startup;
  // The number of bytes downloaded since startup
  long long int sessionDownloadLength;
  // The average speed(bytes per second) since startup
  int avgSpeed;
  // The estimated remaining time to complete the download.
  int eta;
  long long int downloadLength;
  long long int totalLength;

  int calculateSpeed(long long int sessionLength, int elapsed);
  virtual void onEndOfRun();
  virtual void sendStatistics() = 0;
public:
  TorrentDownloadEngine();
  virtual ~TorrentDownloadEngine();

  TorrentMan* torrentMan;

  bool isFilenameFixed() const { return filenameFixed; }

  // returns uploading speed in byte/sec.
  int getUploadSpeed() const { return uploadSpeed; }
  int getDownloadSpeed() const { return downloadSpeed; }
};

#endif // _D_TORRENT_DOWNLOAD_ENGINE_H_