////////////////////////////////////////////////////////////////////////////////
/// 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 Frank Celler
////////////////////////////////////////////////////////////////////////////////

#include "RandomStringMask.h"

#include "Basics/StringUtils.h"
#include "Basics/fasthash.h"
#include "Maskings/Maskings.h"

using namespace arangodb;
using namespace arangodb::maskings;

ParseResult<AttributeMasking> RandomStringMask::create(Path path, Maskings* maskings,
                                                       VPackSlice const&) {
  return ParseResult<AttributeMasking>(AttributeMasking(path, new RandomStringMask(maskings)));
}

VPackValue RandomStringMask::mask(bool value, std::string&) const {
  return VPackValue(value);
}

VPackValue RandomStringMask::mask(std::string const& data, std::string& buffer) const {
  uint64_t len = data.size();
  uint64_t hash;

  hash = fasthash64(data.c_str(), data.size(), _maskings->randomSeed());

  std::string hash64 = basics::StringUtils::encodeBase64(
      std::string((char const*)&hash, sizeof(decltype(hash))));

  buffer.clear();
  buffer.reserve(len);
  buffer.append(hash64);

  if (buffer.size() < len) {
    while (buffer.size() < len) {
      buffer.append(hash64);
    }

    buffer.resize(len);
  }

  return VPackValue(buffer);
}

VPackValue RandomStringMask::mask(int64_t value, std::string&) const {
  return VPackValue(value);
}

VPackValue RandomStringMask::mask(double value, std::string&) const {
  return VPackValue(value);
}