/**
 *   Copyright 2016, Quickstep Research Group, Computer Sciences Department,
 *     University of Wisconsin—Madison.
 *
 *   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.
 **/

#include "transaction/ResourceId.hpp"

#include <cstddef>
#include <functional>
#include <string>

#include "catalog/CatalogTypedefs.hpp"
#include "storage/StorageBlockInfo.hpp"
#include "utility/HashPair.hpp"

#include "glog/logging.h"

namespace quickstep {
namespace transaction {

bool ResourceId::operator==(const ResourceId &other) const {
  return db_id_ == other.db_id_
      && rel_id_ == other.rel_id_
      && block_id_ == other.block_id_
      && tuple_id_ == other.tuple_id_;
}

ResourceId ResourceId::getParentResourceId() const {
  if (isRelationAccess()) {
    return ResourceId(db_id_);
  } else if (isBlockAccess()) {
    return ResourceId(db_id_, rel_id_);
  } else if (isTupleAccess()) {
    return ResourceId(db_id_, rel_id_, block_id_);
  } else {
    LOG(FATAL) << "Database level does not have any parent level.";
  }
}

std::string ResourceId::toString() const {
  return "ResourceId(" +
    std::to_string(db_id_) + ", " +
    std::to_string(rel_id_) + ", " +
    std::to_string(block_id_) + ", " +
    std::to_string(tuple_id_) + ")";
}

std::size_t
ResourceId::ResourceIdHasher::operator()(const ResourceId &rid) const {
  const std::size_t hash1 = std::hash<database_id>()(rid.db_id_);
  const std::size_t hash2 = std::hash<relation_id>()(rid.rel_id_);
  const std::size_t hash3 = std::hash<block_id>()(rid.block_id_);
  const std::size_t hash4 = std::hash<tuple_id>()(rid.tuple_id_);

  const std::size_t comb1 = CombineHashes(hash1, hash2);
  const std::size_t comb2 = CombineHashes(hash3, hash4);

  return CombineHashes(comb1, comb2);
}

}  // namespace transaction
}  // namespace quickstep