// ----------------------------------------------------------------------
// File: Configuration.hh
// Author: Georgios Bitzes - CERN
// ----------------------------------------------------------------------

/************************************************************************
 * quarkdb - a redis-like highly available key-value store              *
 * Copyright (C) 2016 CERN/Switzerland                                  *
 *                                                                      *
 * This program is free software: you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.*
 ************************************************************************/

#ifndef __QUARKDB_CONFIGURATION_H__
#define __QUARKDB_CONFIGURATION_H__

#include <string>
#include <vector>

#include "Common.hh"
#include "utils/Macros.hh"

namespace quarkdb {

class ConfigurationReader;

enum class Mode {
  standalone = 0,
  raft = 1,
  bulkload = 2
};

inline std::string modeToString(const Mode &mode) {
  if(mode == Mode::standalone) {
    return "STANDALONE";
  }
  if(mode == Mode::raft) {
    return "RAFT";
  }
  if(mode == Mode::bulkload) {
    return "BULKLOAD";
  }
  qdb_throw("unknown mode"); // should never happen
}

class Configuration {
public:
  static bool fromFile(const std::string &filename, Configuration &out);
  static bool fromString(const std::string &str, Configuration &out);
  static bool fromReader(ConfigurationReader &reader, Configuration &out);
  bool isValid();

  Mode getMode() const { return mode; }
  std::string getDatabase() const { return database; }
  TraceLevel getTraceLevel() const { return trace; }
  std::string getCertificatePath() const { return certificatePath; }
  std::string getCertificateKeyPath() const { return certificateKeyPath; }

  std::string getPasswordFilePath() const { return passwordFilePath; }
  std::string getPassword() const { return password; }
  RaftServer getMyself() const { return myself; }
  bool getWriteAheadLog() const { return writeAheadLog; }
  bool getRequirePasswordForLocalhost() const { return requirePasswordForLocalhost; }
  std::string getConfigurationPath() const { return configurationPath; }

  std::string extractPasswordOrDie() const;
private:
  Mode mode;
  std::string database;
  TraceLevel trace = TraceLevel::info;
  std::string certificatePath;
  std::string certificateKeyPath;
  std::string passwordFilePath;
  std::string password;
  bool requirePasswordForLocalhost = false;
  bool writeAheadLog = true;
  std::string configurationPath;


  // raft options
  RaftServer myself;
};
}

#endif