/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 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 "UTMetadataRequestFactory.h"
#include "PieceStorage.h"
#include "DownloadContext.h"
#include "Peer.h"
#include "BtMessageDispatcher.h"
#include "BtMessageFactory.h"
#include "UTMetadataRequestExtensionMessage.h"
#include "UTMetadataRequestTracker.h"
#include "BtMessage.h"
#include "Logger.h"
#include "LogFactory.h"
#include "fmt.h"
#include "ExtensionMessageRegistry.h"
#include "BtExtendedMessage.h"

namespace aria2 {

UTMetadataRequestFactory::UTMetadataRequestFactory()
  : dctx_{nullptr},
    dispatcher_{nullptr},
    messageFactory_{nullptr},
    tracker_{nullptr},
    cuid_{0}
{}

std::vector<std::unique_ptr<BtMessage>> UTMetadataRequestFactory::create
(size_t num, PieceStorage* pieceStorage)
{
  auto msgs = std::vector<std::unique_ptr<BtMessage>>{};
  while(num) {
    auto metadataRequests = tracker_->getAllTrackedIndex();
    auto p = pieceStorage->getMissingPiece(peer_, metadataRequests, cuid_);
    if(!p) {
      A2_LOG_DEBUG("No ut_metadata piece is available to download.");
      break;
    }
    --num;
    A2_LOG_DEBUG(fmt("Creating ut_metadata request index=%lu",
                     static_cast<unsigned long>(p->getIndex())));
    auto m = make_unique<UTMetadataRequestExtensionMessage>
      (peer_->getExtensionMessageID(ExtensionMessageRegistry::UT_METADATA));
    m->setIndex(p->getIndex());
    m->setDownloadContext(dctx_);
    m->setBtMessageDispatcher(dispatcher_);
    m->setBtMessageFactory(messageFactory_);
    m->setPeer(peer_);

    msgs.push_back(messageFactory_->createBtExtendedMessage(std::move(m)));
    tracker_->add(p->getIndex());
  }
  return msgs;
}

} // namespace aria2
