////////////////////////////////////////////////////////////////////////////////
/// 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 "ShortestPathOptions.h"

#include "Basics/VelocyPackHelper.h"

#include <velocypack/Iterator.h>
#include <velocypack/velocypack-aliases.h>

using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::graph;

ShortestPathOptions::ShortestPathOptions(transaction::Methods* trx)
    : BaseOptions(trx),
      direction("outbound"),
      weightAttribute(""),
      defaultWeight(1),
      bidirectional(true),
      multiThreaded(true) {}

ShortestPathOptions::ShortestPathOptions(transaction::Methods* trx,
                                         VPackSlice const& info)
    : BaseOptions(trx),
      direction("outbound"),
      weightAttribute(""),
      defaultWeight(1),
      bidirectional(true),
      multiThreaded(true) {
  VPackSlice obj = info.get("shortestPathFlags");

  if (obj.isObject()) {
    weightAttribute =
        VelocyPackHelper::getStringValue(obj, "weightAttribute", "");
    defaultWeight =
        VelocyPackHelper::getNumericValue<double>(obj, "defaultWeight", 1);
  }
}

ShortestPathOptions::~ShortestPathOptions() {}

void ShortestPathOptions::buildEngineInfo(VPackBuilder& result) const {
  // TODO Implement me!
  BaseOptions::buildEngineInfo(result);
}

void ShortestPathOptions::setStart(std::string const& id) {
  start = id;
  startBuilder.clear();
  startBuilder.add(VPackValue(id));
}

void ShortestPathOptions::setEnd(std::string const& id) {
  end = id;
  endBuilder.clear();
  endBuilder.add(VPackValue(id));
}

VPackSlice ShortestPathOptions::getStart() const {
  return startBuilder.slice();
}

VPackSlice ShortestPathOptions::getEnd() const { return endBuilder.slice(); }

bool ShortestPathOptions::useWeight() const {
  return !weightAttribute.empty();
}

void ShortestPathOptions::toVelocyPack(VPackBuilder& builder) const {
  VPackObjectBuilder guard(&builder);
  builder.add("weightAttribute", VPackValue(weightAttribute));
  builder.add("defaultWeight", VPackValue(defaultWeight));
}

void ShortestPathOptions::toVelocyPackIndexes(VPackBuilder& builder) const {
  // TODO Implement me
}

double ShortestPathOptions::estimateCost(size_t& nrItems) const {
  // TODO Implement me
  return 0;
}

void ShortestPathOptions::addReverseLookupInfo(
    aql::Ast* ast, std::string const& collectionName,
    std::string const& attributeName, aql::AstNode* condition) {
  injectLookupInfoInList(_reverseLookupInfos, ast, collectionName,
                         attributeName, condition);
}

EdgeCursor* ShortestPathOptions::nextCursor(ManagedDocumentResult* mmdr,
                                            StringRef vid, uint64_t depth) {
  if (_isCoordinator) {
    return nextCursorCoordinator(vid, depth);
  }
  TRI_ASSERT(mmdr != nullptr);
  return nextCursorLocal(mmdr, vid, depth, _baseLookupInfos);
}

EdgeCursor* ShortestPathOptions::nextCursorLocal(ManagedDocumentResult* mmdr,
                                                 StringRef vid, uint64_t depth,
                                                 std::vector<LookupInfo>&) {
  THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
}

EdgeCursor* ShortestPathOptions::nextCursorCoordinator(StringRef vid,
                                                       uint64_t depth) {
  THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
}

EdgeCursor* ShortestPathOptions::nextReverseCursorCoordinator(StringRef vid,
                                                              uint64_t depth) {
  THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
}