////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Michael Hackstein
////////////////////////////////////////////////////////////////////////////////

#include "ShortestPathFinder.h"

#include "Aql/Query.h"
#include "Basics/StringUtils.h"
#include "Cluster/ServerState.h"
#include "Graph/ClusterTraverserCache.h"
#include "Graph/ShortestPathOptions.h"
#include "Logger/LogMacros.h"
#include "Network/Methods.h"
#include "Network/NetworkFeature.h"
#include "Network/Utils.h"
#include "Transaction/Methods.h"

using namespace arangodb;
using namespace arangodb::graph;

ShortestPathFinder::ShortestPathFinder(ShortestPathOptions& options)
    : _options(options),
      _httpRequests(0) {}

void ShortestPathFinder::destroyEngines() {
  if (!ServerState::instance()->isCoordinator()) {
    return;
  }
  NetworkFeature const& nf =
      _options.query()->vocbase().server().getFeature<NetworkFeature>();
  network::ConnectionPool* pool = nf.pool();
  // We have to clean up the engines in Coordinator Case.
  if (pool == nullptr) {
    return;
  }
  // nullptr only happens on controlled server shutdown
  
  auto ch = reinterpret_cast<ClusterTraverserCache*>(_options.cache());
  
  network::RequestOptions options;
  options.database = _options.trx()->vocbase().name();
  options.timeout = network::Timeout(30.0);
  options.skipScheduler = true; // hack to speed up future.get()

  for (auto const& it : *ch->engines()) {
    incHttpRequests(1);

    auto res =
        network::sendRequest(pool, "server:" + it.first, fuerte::RestVerb::Delete,
                             "/_internal/traverser/" + arangodb::basics::StringUtils::itoa(it.second),
                             VPackBuffer<uint8_t>(), options)
            .get();

    if (res.error != fuerte::Error::NoError) {
      // Note If there was an error on server side we do not have
      // CL_COMM_SENT
      std::string message("Could not destroy all traversal engines");
      message += std::string(": ") +
                 TRI_errno_string(network::fuerteToArangoErrorCode(res));
      LOG_TOPIC("d31a4", ERR, arangodb::Logger::FIXME) << message;
    }
  }
}

ShortestPathOptions& ShortestPathFinder::options() const { return _options; }