// 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 "kudu/util/oid_generator.h"

#include <cstdint>
#include <exception>
#include <mutex>
#include <string>

#include <boost/uuid/uuid.hpp>
#include <glog/logging.h>

#include "kudu/gutil/stringprintf.h"
#include "kudu/gutil/strings/substitute.h"
#include "kudu/util/status.h"

using std::string;
using strings::Substitute;

namespace kudu {

namespace {

string ConvertUuidToString(const boost::uuids::uuid& to_convert) {
  const uint8_t* uuid = to_convert.data;
  return StringPrintf("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
               uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7],
               uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
}

} // anonymous namespace

string ObjectIdGenerator::Next() {
  std::lock_guard<LockType> l(oid_lock_);
  boost::uuids::uuid uuid = oid_generator_();
  return ConvertUuidToString(uuid);
}

Status ObjectIdGenerator::Canonicalize(const string& input,
                                       string* output) const {
  try {
    boost::uuids::uuid uuid = oid_validator_(input);
    *output = ConvertUuidToString(uuid);
    return Status::OK();
  } catch (std::exception& e) {
    return Status::InvalidArgument(Substitute("invalid uuid $0: $1",
                                              input, e.what()));
  }
}

string ObjectIdGenerator::NextOf(const string& id) {
  DCHECK(!id.empty());
  string next(id);
  next[next.size() - 1] += 1;
  return next;
}

} // namespace kudu