/* <!-- 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 --> */
#include "ChecksumCommand.h"
#include "DlAbortEx.h"
#include "message.h"

void ChecksumCommand::initValidator()
{
  _validator = new IteratableChecksumValidator();
  // TODO checksum will be held by DownloadContext
  _validator->setChecksum(0);
  //_validator->setDiskWriter(new DiskAdaptorWriter(_requestGroup->getSegmentMan()->getDiskAdaptor()));
  // TODO we should use PieceStorage instead of BitfieldMan
  //_validator->setBitfield(_requestGroup->getSegmentMan()->getBitfield());
  if(!_validator->canValidate()) {
    // insufficient checksums.
    throw new DlAbortEx(EX_INSUFFICIENT_CHECKSUM);
  }
  _validator->init();
}

bool ChecksumCommand::executeInternal()
{
  if(_e->isHaltRequested()) {
    return true;
  }
  _validator->validateChunk();
  if(_validator->finished()) {
    if(_requestGroup->downloadFinished()) {
      logger->notice(MSG_GOOD_CHECKSUM, cuid, _requestGroup->getFilePath().c_str());
      return true;
    } else {
      logger->error(MSG_BAD_CHECKSUM, cuid, _requestGroup->getFilePath().c_str());
      return true;
    }
  } else {
    _e->commands.push_back(this);
    return false;
  }

}

bool ChecksumCommand::handleException(Exception* e)
{
  logger->error(MSG_FILE_VALIDATION_FAILURE, e, cuid);
  logger->error(MSG_DOWNLOAD_NOT_COMPLETE, cuid, _requestGroup->getFilePath().c_str());
  // TODO We need to set bitfield back to the state when validation begun.
  // The one of the solution is having a copy of bitfield before settting its
  // all bit to 1. If exception is thrown, then assign the copy to the bitfield.
  return true;
}