/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2013, Regents of the University of California
 * BSD license, See the LICENSE file for more information
 * Author: Yingdi Yu <yingdi@cs.ucla.edu>
 */

#ifndef NDNSEC_KEY_GEN_HPP
#define NDNSEC_KEY_GEN_HPP

#include "ndnsec-util.hpp"

int 
ndnsec_key_gen(int argc, char** argv)	
{
  using namespace ndn;
  namespace po = boost::program_options;

  std::string identityName;
  bool notDefault = false;
  char keyType = 'r';
  int keySize = 2048;
  std::string outputFilename;

  po::options_description desc("General Usage\n  ndnsec key-gen [-h] [-n] identity\nGeneral options");
  desc.add_options()
    ("help,h", "produce help message")
    ("identity,i", po::value<std::string>(&identityName), "identity name, for example, /ndn/ucla.edu/alice")
    ("not_default,n", "optional, if not specified, the target identity will be set as the default identity of the system")
    // ("type,t", po::value<char>(&keyType)->default_value('r'), "optional, key type, r for RSA key (default)")
    // ("size,s", po::value<int>(&keySize)->default_value(2048), "optional, key size, 2048 (default)")
    ;

  po::positional_options_description p;
  p.add("identity", 1);
  
  po::variables_map vm;
  po::store(po::command_line_parser(argc, argv).options(desc).positional(p).run(), vm);
  po::notify(vm);

  if (vm.count("help")) 
    {
      std::cerr << desc << std::endl;
      return 0;
    }

  if (0 == vm.count("identity"))
    {
      std::cerr << "identity must be specified" << std::endl;
      std::cerr << desc << std::endl;
      return 1;
    }
  
  if (vm.count("not_default"))
    notDefault = true;
  
  if (true)
    {
      switch(keyType)
        {
        case 'r':
          {
            shared_ptr<IdentityCertificate> idcert;
            try
              {
                KeyChain keyChain;
                
                Name keyName = keyChain.generateRSAKeyPair(Name(identityName), true, keySize);            
                
                if(0 == keyName.size())
                  {                  
                    return 1;
                  }
                
                keyChain.setDefaultKeyNameForIdentity(keyName);
            
                idcert = keyChain.selfSign(keyName);
                
                if(!notDefault)
                  {
                    keyChain.setDefaultIdentity(Name(identityName));
                  }
              }
            catch(const SecPublicInfo::Error& e)
              {
                std::cerr << "ERROR: " << e.what() << std::endl;
                return 1;
              }
            catch(const SecTpm::Error& e)
              {
                std::cerr << "ERROR: " << e.what() << std::endl;
                return 1;
              }

            try
              {
                CryptoPP::StringSource ss(idcert->wireEncode().wire(), 
                                          idcert->wireEncode().size(), 
                                          true,
                                          new CryptoPP::Base64Encoder(new CryptoPP::FileSink(std::cout), true, 64));
                return 0;
              }
            catch(const CryptoPP::Exception& e)
              {
                std::cerr << "ERROR: " << e.what() << std::endl;
                return 1;
              }
        }
      default:
        std::cerr << "Unrecongized key type" << "\n";
        std::cerr << desc << std::endl;
        return 1;
      }
    }

  return 0;
}

#endif //NDNSEC_KEY_GEN_HPP