////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2018 ArangoDB 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 Tobias Goedderz
/// @author Michael Hackstein
/// @author Heiko Kernbach
/// @author Jan Christoph Uhde
////////////////////////////////////////////////////////////////////////////////

#include <lib/Logger/LogMacros.h>
#include "TestExecutorHelper.h"

#include "Basics/Common.h"

#include "Aql/InputAqlItemRow.h"
#include "Aql/AqlValue.h"
#include "Aql/ExecutorInfos.h"
#include "Aql/SingleRowFetcher.h"

#include <utility>

using namespace arangodb;
using namespace arangodb::aql;

TestExecutorHelper::TestExecutorHelper(Fetcher& fetcher, Infos& infos) : _infos(infos), _fetcher(fetcher){};
TestExecutorHelper::~TestExecutorHelper() = default;

std::pair<ExecutionState, FilterStats> TestExecutorHelper::produceRows(OutputAqlItemRow& output) {
  TRI_IF_FAILURE("TestExecutorHelper::produceRows") {
    THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
  }
  ExecutionState state;
  FilterStats stats{};
  InputAqlItemRow input{CreateInvalidInputRowHint{}};

  while (true) {
    std::tie(state, input) = _fetcher.fetchRow();

    if (state == ExecutionState::WAITING) {
      if (_returnedDone) {
        return {ExecutionState::DONE, stats};
      }
      return {state, stats};
    }

    if (!input) {
      TRI_ASSERT(state == ExecutionState::DONE);
      _returnedDone = true;
      return {state, stats};
    }
    TRI_ASSERT(input.isInitialized());

    output.copyRow(input);
    return {state, stats};
    //stats.incrFiltered();
  }
}

TestExecutorHelperInfos::TestExecutorHelperInfos(RegisterId inputRegister_,
                                                 RegisterId nrInputRegisters,
                                                 RegisterId nrOutputRegisters,
                                                 std::unordered_set<RegisterId> registersToClear,
                                                 std::unordered_set<RegisterId> registersToKeep)
    : ExecutorInfos(std::make_shared<std::unordered_set<RegisterId>>(inputRegister_),
                    nullptr, nrInputRegisters, nrOutputRegisters,
                    std::move(registersToClear), std::move(registersToKeep)),
      _inputRegister(inputRegister_) {}