text: // Copyright (c) 2014-2017 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_CHAINPARAMSBASE_H
  #define BITCOIN_CHAINPARAMSBASE_H
  
  #include <memory>
  #include <string>
  #include <vector>
  
  enum NetworkType
  {
      Mainnet,
      Testnet,
      Regtest
  };
  
  
  /**
   * CBaseChainParams defines the base parameters (shared between bitcoin-cli and bitcoind)
   * of a given instance of the Bitcoin system.
   */
  class CBaseChainParams
  {
  public:
      /** BIP70 chain name strings (main, test or regtest) */
      static const std::string MAIN;
      static const std::string TESTNET;
      static const std::string REGTEST;
  
      const std::string& DataDir() const { return strDataDir; }
      int RPCPort() const { return nRPCPort; }
  
  protected:
      CBaseChainParams() {}
  
      int nRPCPort;
      std::string strDataDir;
  };
  
  /**
   * Creates and returns a std::unique_ptr<CBaseChainParams> of the chosen chain.
   * @returns a CBaseChainParams* of the chosen chain.
   * @throws a std::runtime_error if the chain is not supported.
   */
  std::unique_ptr<CBaseChainParams> CreateBaseChainParams(NetworkType networkType);
  
  /**
   * Append the help messages for the chainparams options to the
   * parameter string.
   */
  void AppendParamsHelpMessages(std::string& strUsage, bool debugHelp=true);
  
  /**
   * Return the currently selected parameters. This won't change after app
   * startup, except for unit tests.
   */
  const CBaseChainParams& BaseParams();
  
  /** Sets the params returned by Params() to those for the given network. */
  void SelectBaseParams(NetworkType networkType);
  
  /**
   * Looks for -regtest, -testnet and returns the appropriate BIP70 chain name.
   * @return CBaseChainParams::MAX_NETWORK_TYPES if an invalid combination is given. CBaseChainParams::MAIN by default.
   */
  NetworkType ChainTypeFromCommandLine();
  
  std::string GetChainName(NetworkType networkType);
  
  #endif // BITCOIN_CHAINPARAMSBASE_H
  