/* -*- 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_EXPORT_HPP
#define NDNSEC_EXPORT_HPP

#include "ndnsec-util.hpp"

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

  std::string identityStr;
  std::string output;
  std::string exportPassword;
  bool privateExport = false;

  po::options_description desc("General Usage\n  ndnsec export [-h] [-o output] [-p] identity \nGeneral options");
  desc.add_options()
    ("help,h", "Produce help message")
    ("output,o", po::value<std::string>(&output), "(Optional) output file, stdout if not specified")
    ("private,p", "export info contains private key")
    ("identity,i", po::value<std::string>(&identityStr), "Identity to export")
    ;

  po::positional_options_description p;
  p.add("identity", 1);

  po::variables_map vm;
  try
    {
      po::store(po::command_line_parser(argc, argv).options(desc).positional(p).run(), vm);
      po::notify(vm);
    }
  catch (std::exception &e)
    {
      std::cerr << "ERROR: " << e.what() << std::endl;
      return 1;
    }

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

  if (vm.count("private"))
    privateExport = true;

  if (!vm.count("output"))
    output = "-";

  Name identity(identityStr);
  if(!privateExport)
    {
      try
        {
          KeyChain keyChain;
          shared_ptr<IdentityCertificate> cert = keyChain.getCertificate(keyChain.getDefaultCertificateNameForIdentity(identity));          
          if(output == "-")
            io::save(*cert, std::cout);
          else
            io::save(*cert, output);
            
          return 0;
        }
      catch(SecPublicInfo::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          return 1;
        }
      catch(SecTpm::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          return 1;
        }
      catch(io::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          return 1;
        }
    }
  else
    {
      Block wire;
      try
        {
          KeyChain keyChain;

          int count = 3;
          while(!getPassword(exportPassword, "Passphrase for the private key: "))
            {
              count--;
              if(count <= 0)
                {
                  std::cerr << "ERROR: invalid password" << std::endl;
                  memset(const_cast<char*>(exportPassword.c_str()), 0, exportPassword.size());
                  return 1;
                }
            }
          shared_ptr<SecuredBag> securedBag = keyChain.exportIdentity(identity, exportPassword);
          memset(const_cast<char*>(exportPassword.c_str()), 0, exportPassword.size());
          
          if(output == "-")
            io::save(*securedBag, std::cout);
          else
            io::save(*securedBag, output);

          return 0;
        }
      catch(io::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          memset(const_cast<char*>(exportPassword.c_str()), 0, exportPassword.size());
          return 1;
        }
      catch(SecPublicInfo::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          memset(const_cast<char*>(exportPassword.c_str()), 0, exportPassword.size());
          return 1;
        }
      catch(SecTpm::Error& e)
        {
          std::cerr << "ERROR: " << e.what() << std::endl;
          memset(const_cast<char*>(exportPassword.c_str()), 0, exportPassword.size());
          return 1;
        }
    }
}

#endif //NDNSEC_EXPORT_HPP