/* <!-- 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 "UTMetadataRequestTracker.h"

#include <algorithm>

#include "Logger.h"
#include "LogFactory.h"
#include "fmt.h"

namespace aria2 {

UTMetadataRequestTracker::UTMetadataRequestTracker() {}

void UTMetadataRequestTracker::add(size_t index)
{
  trackedRequests_.push_back(RequestEntry(index));
}

bool UTMetadataRequestTracker::tracks(size_t index)
{
  return std::find(trackedRequests_.begin(), trackedRequests_.end(),
                   RequestEntry(index)) != trackedRequests_.end();
}

void UTMetadataRequestTracker::remove(size_t index)
{
  auto i = std::find(trackedRequests_.begin(), trackedRequests_.end(),
                     RequestEntry(index));
  if (i != trackedRequests_.end()) {
    trackedRequests_.erase(i);
  }
}

namespace {
constexpr auto TIMEOUT = 20_s;
} // namespace

std::vector<size_t> UTMetadataRequestTracker::removeTimeoutEntry()
{
  std::vector<size_t> indexes;
  trackedRequests_.erase(
      std::remove_if(std::begin(trackedRequests_), std::end(trackedRequests_),
                     [&indexes](const RequestEntry& ent) {
                       if (ent.elapsed(TIMEOUT)) {
                         A2_LOG_DEBUG(
                             fmt("ut_metadata request timeout. index=%lu",
                                 static_cast<unsigned long>(ent.index_)));
                         indexes.push_back(ent.index_);
                         return true;
                       }
                       return false;
                     }),
      std::end(trackedRequests_));
  return indexes;
}

size_t UTMetadataRequestTracker::avail() const
{
  const size_t MAX_OUTSTANDING_REQUEST = 1;
  if (MAX_OUTSTANDING_REQUEST > count()) {
    return MAX_OUTSTANDING_REQUEST - count();
  }
  else {
    return 0;
  }
}

std::vector<size_t> UTMetadataRequestTracker::getAllTrackedIndex() const
{
  std::vector<size_t> indexes;
  for (auto& e : trackedRequests_) {
    indexes.push_back(e.index_);
  }
  return indexes;
}

} // namespace aria2