/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2012 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 --> */
#include "TransferStat.h"

#include <algorithm>

namespace aria2 {

TransferStat operator+(const TransferStat& a, const TransferStat& b)
{
  TransferStat c(a);
  c += b;
  return c;
}

TransferStat operator-(const TransferStat& a, const TransferStat& b)
{
  TransferStat c(a);
  c -= b;
  return c;
}

TransferStat& TransferStat::operator+=(const TransferStat& b)
{
  downloadSpeed += b.downloadSpeed;
  uploadSpeed += b.uploadSpeed;
  sessionDownloadLength += b.sessionDownloadLength;
  sessionUploadLength += b.sessionUploadLength;
  return *this;
}

TransferStat& TransferStat::operator-=(const TransferStat& b)
{
  downloadSpeed -= b.downloadSpeed;
  uploadSpeed -= b.uploadSpeed;
  sessionDownloadLength -= b.sessionDownloadLength;
  sessionUploadLength -= b.sessionUploadLength;

  downloadSpeed = std::max(0, downloadSpeed);
  uploadSpeed = std::max(0, uploadSpeed);
  sessionDownloadLength = std::max(static_cast<int64_t>(0),
                                   sessionDownloadLength);
  sessionUploadLength = std::max(static_cast<int64_t>(0),
                                 sessionUploadLength);
  return *this;
}

} // namespace aria2