/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 "platform/consensus/ordering/poc/pow/merkle.h"

#include "platform/consensus/ordering/poc/pow/miner_utils.h"

namespace resdb {
namespace {

std::string TrverseMakeHash(const BatchClientTransactions& transaction,
                            int l_idx, int r_idx) {
  if (l_idx == r_idx) {
    return GetHashValue(transaction.transactions(l_idx).transaction_data());
  }
  int mid = (l_idx + r_idx) >> 1;

  std::string l_chd = TrverseMakeHash(transaction, l_idx, mid);
  std::string r_chd = TrverseMakeHash(transaction, mid + 1, r_idx);
  return GetHashValue(l_chd + r_chd);
}

}  // namespace

HashValue Merkle::MakeHash(const BatchClientTransactions& transaction) {
  std::string root_hash =
      TrverseMakeHash(transaction, 0, transaction.transactions_size() - 1);
  return DigestToHash(root_hash);
}

}  // namespace resdb
