/*
 * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * 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 "ConfigManager.h"

#include <cstdlib>

namespace neurun
{
namespace config
{

ConfigManager &ConfigManager::instance()
{
  static ConfigManager manager;
  return manager;
}

ConfigManager::ConfigManager()
{
  auto fetch_from_env_var = [&](const std::string &key) {
    const char *value = std::getenv(key.c_str());
    if (value != nullptr)
    {
      _map[key] = value;
    }
  };

#define CONFIG(Name, Type, Default)                        \
  _map.insert({std::string{#Name}, std::string{Default}}); \
  fetch_from_env_var(#Name);

#include "Config.lst"

#undef CONFIG
}

template <> bool ConfigManager::get<bool>(const std::string &key) const
{
  auto raw = _map.at(key);

  static const std::array<std::string, 5> false_list{"0", "OFF", "FALSE", "N", "NO"};
  auto false_found = std::find(false_list.begin(), false_list.end(), raw);

  return (false_found == false_list.end());
}

template <> int ConfigManager::get<int>(const std::string &key) const
{
  auto raw = _map.at(key);
  return std::stoi(raw);
}

template <> std::string ConfigManager::get<std::string>(const std::string &key) const
{
  auto raw = _map.at(key);
  return raw;
}

} // namespace config
} // namespace neurun