/*
 * Copyright 2015 Twitter, Inc.
 *
 * 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 "basics/ridgen.h"
#include <sstream>
#include <string>
#include "glog/logging.h"
#include "kashmir/uuid.h"
#include "kashmir/devrandom.h"

void REQID::assign(const std::string& _id) {
  CHECK_EQ(_id.length(), REQID_size) << "ReqID should be " << REQID_size << " chars!";
  id_ = _id;
}

REQID_Generator::REQID_Generator() {
  using kashmir::system::DevRandom;
  rands_ = reinterpret_cast<void*>(new DevRandom);
}

REQID_Generator::~REQID_Generator() {
  using kashmir::system::DevRandom;

  DevRandom* rs = reinterpret_cast<DevRandom*>(rands_);
  delete rs;
}

REQID
REQID_Generator::generate() {
  using kashmir::system::DevRandom;

  // Generate a unique ID
  kashmir::uuid_t uuid;
  DevRandom* rs = reinterpret_cast<DevRandom*>(rands_);
  (*rs) >> uuid;

  // Convert into string
  std::ostringstream ss;
  ss << uuid;
  return REQID(ss.str());
}

REQID
REQID_Generator::generate_zero_reqid() { return REQID(); }