/* <!-- 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 "CheckIntegrityCommand.h"
#include "FileAllocationEntry.h"
#include "InitiateConnectionCommandFactory.h"
#include "DlAbortEx.h"
#include "message.h"

void CheckIntegrityCommand::initValidator()
{
  _validator = new IteratableChunkChecksumValidator();
  _validator->setChunkChecksum(_requestGroup->getChunkChecksum());
  _validator->setDiskWriter(_requestGroup->getSegmentMan()->diskWriter);
  _validator->setBitfield(_requestGroup->getSegmentMan()->getBitfield());
  if(!_validator->canValidate()) {
    // insufficient checksums.
    throw new DlAbortEx("Insufficient checksums.");
  }
  _validator->init();
}

bool CheckIntegrityCommand::execute()
{
  setStatusRealtime();
  _e->noWait = true;

  try {
    _validator->validateChunk();
    if(_validator->finished()) {
      if(_requestGroup->downloadFinished()) {
	logger->notice(MSG_DOWNLOAD_ALREADY_COMPLETED, cuid, _requestGroup->getFilePath().c_str());
	return true;
      }
      if(_requestGroup->needsFileAllocation()) {
	_e->_fileAllocationMan->pushFileAllocationEntry(new FileAllocationEntry(cuid, _req, _requestGroup)); 
      } else {
	int32_t numCommandsToGenerate = 15;
	Commands commands = _requestGroup->getNextCommand(_e, numCommandsToGenerate);
	Command* command = InitiateConnectionCommandFactory::createInitiateConnectionCommand(cuid, _req, _requestGroup, _e);
	commands.push_front(command);
	_e->addCommand(commands);
      }
      return true;
    } else {
      _e->commands.push_back(this);
      return false;
    }
  } catch(Exception* e) {
    _requestGroup->getSegmentMan()->errors++;
    logger->error("CUID#%d - Exception caught while validating file integrity.", e, cuid);
    delete e;
    logger->error(MSG_DOWNLOAD_NOT_COMPLETE, cuid, _requestGroup->getFilePath().c_str());
    // TODO this is wrong. There may exist invalid chunk data before catching
    // exception. Fix this.
    _requestGroup->markPieceDone(_validator->getCurrentOffset());
    return true;
  }
}