/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2013-2014 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library 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 Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 *
 * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
 */

#ifndef NDNSEC_CERT_DUMP_HPP
#define NDNSEC_CERT_DUMP_HPP

#include "ndnsec-util.hpp"

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

  std::string name;
  bool isKeyName = false;
  bool isIdentityName = false;
  bool isCertName = true;
  // bool isFileName = false;
  bool isPretty = false;
  bool isStdOut = true;
  bool isRepoOut = false;
  std::string repoHost = "127.0.0.1";
  std::string repoPort = "7376";
  // bool isDnsOut = false;

  po::options_description description("General Usage\n  ndnsec cert-dump [-h] [-p] [-d] [-r [-H repo-host] [-P repor-port] ] [-i|k|f] name\nGeneral options");
  description.add_options()
    ("help,h", "produce help message")
    ("pretty,p", "optional, if specified, display certificate in human readable format")
    ("identity,i", "optional, if specified, name is identity name (e.g. /ndn/edu/ucla/alice), otherwise certificate name")
    ("key,k", "optional, if specified, name is key name (e.g. /ndn/edu/ucla/alice/KSK-123456789), otherwise certificate name")
    ("file,f", "optional, if specified, name is file name, - for stdin")
    ("repo-output,r", "optional, if specified, certificate is dumped (published) to repo")
    ("repo-host,H", po::value<std::string>(&repoHost)->default_value("localhost"), "optional, the repo host if repo-output is specified")
    ("repo-port,P", po::value<std::string>(&repoPort)->default_value("7376"), "optional, the repo port if repo-output is specified")
    // ("dns-output,d", "optional, if specified, certificate is dumped (published) to DNS")
    ("name,n", po::value<std::string>(&name), "certificate name, for example, /ndn/edu/ucla/KEY/cs/alice/ksk-1234567890/ID-CERT/%FD%FF%FF%FF%FF%FF%FF%FF")
    ;

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

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

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

  if (vm.count("name") == 0)
    {
      std::cerr << "identity_name must be specified" << std::endl;
      std::cerr << description << std::endl;
      return 1;
    }

  if (vm.count("key") != 0)
    {
      isCertName = false;
      isKeyName = true;
    }
  else if (vm.count("identity") != 0)
    {
      isCertName = false;
      isIdentityName = true;
    }
  else if (vm.count("file") != 0)
    {
      isCertName = false;
      // isFileName = true;
    }

  if (vm.count("pretty") != 0)
    isPretty = true;

  if (vm.count("repo-output") != 0)
    {
      isRepoOut = true;
      isStdOut = false;
    }
  else if (vm.count("dns-output") != 0)
    {
      // isDnsOut = true;
      isStdOut = false;
      std::cerr << "Error: DNS output is not supported yet!" << std::endl;
      return 1;
    }

  if (isPretty && !isStdOut)
    {
      std::cerr << "Error: pretty option can only be specified when other output option is specified" << std::endl;
      return 1;
    }

  shared_ptr<IdentityCertificate> certificate;

  KeyChain keyChain;

  if (isIdentityName || isKeyName || isCertName)
    {
      if (isIdentityName)
        {
          Name certName = keyChain.getDefaultCertificateNameForIdentity(name);
          certificate = keyChain.getCertificate(certName);
        }
      else if (isKeyName)
        {
          Name certName = keyChain.getDefaultCertificateNameForKey(name);
          certificate = keyChain.getCertificate(certName);
        }
      else
        certificate = keyChain.getCertificate(name);

      if (!static_cast<bool>(certificate))
        {
          std::cerr << "No certificate found!" << std::endl;
          return 1;
        }
    }
  else
    {
      certificate = getIdentityCertificate(name);
      if (!static_cast<bool>(certificate))
        {
          std::cerr << "No certificate read!" << std::endl;
          return 1;
        }
    }

  if (isPretty)
    {
      std::cout << *certificate << std::endl;
    }
  else
    {
      if (isStdOut)
        {
          io::save(*certificate, std::cout);
          return 0;
        }
      if (isRepoOut)
        {
          using namespace boost::asio::ip;
          tcp::iostream request_stream;
          request_stream.expires_from_now(boost::posix_time::milliseconds(3000));
          request_stream.connect(repoHost, repoPort);
          if (!request_stream)
            {
              std::cerr << "fail to open the stream!" << std::endl;
              return 1;
            }
          request_stream.write(reinterpret_cast<const char*>(certificate->wireEncode().wire()),
                               certificate->wireEncode().size());

          return 0;
        }
    }
  return 0;
}

#endif //NDNSEC_CERT_DUMP_HPP