/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2013 University of California, Los Angeles
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Wentao Shang <wentao@cs.ucla.edu>
 */

#include "face.hpp"
#include "security/key-chain.hpp"

#if NDN_CPP_HAVE_CXX11
// In the std library, the placeholders are in a different namespace than boost.
using namespace ndn::func_lib::placeholders;
#endif

#define MAX_SEG_SIZE 4096

class Producer
{
public:
  Producer (const char* name)
  : m_name (name)
  , m_verbose (false)
  {
    int segnum = 0;
    char* buf = new char[MAX_SEG_SIZE];
    do
      {
        std::cin.read (buf, MAX_SEG_SIZE);
        int got = std::cin.gcount ();

        if (got > 0)
          {
            ndn::ptr_lib::shared_ptr<ndn::Data> data = ndn::ptr_lib::make_shared<ndn::Data> (ndn::Name(m_name).appendSegment (segnum));
            data->setFreshnessPeriod (10000); // 10 sec
            data->setContent (reinterpret_cast<const uint8_t*>(buf), got);
            
            m_keychain.sign(*data);
            m_store.push_back(data);
            segnum++;
          }
      }
    while (std::cin);

    if (m_verbose)
      std::cerr << "Created " << segnum << " chunks for prefix [" << m_name << "]" << std::endl;
  }

  void
  onInterest (const ndn::ptr_lib::shared_ptr<const ndn::Name>& name, const ndn::ptr_lib::shared_ptr<const ndn::Interest>& interest)
  {
    if (m_verbose)
      std::cerr << "<< I: " << *interest << std::endl;
    
    size_t segnum = static_cast<size_t>(interest->getName ().rbegin ()->toSegment ());

    if (segnum < m_store.size())
      {
        m_face.put (*m_store[segnum]);
      }
  }

  void
  onRegisterFailed (const ndn::ptr_lib::shared_ptr<const ndn::Name>&)
  {
    std::cerr << "ERROR: Failed to register prefix in local hub's daemon" << std::endl;
    m_face.shutdown ();
  }
  
  void
  run ()
  {
    if (m_store.empty())
      {
        std::cerr << "Nothing to serve. Exiting." << std::endl;
        return;
      }
    
    m_face.setInterestFilter (m_name,
                              ndn::func_lib::bind (&Producer::onInterest, this, _1, _2),
                              ndn::func_lib::bind (&Producer::onRegisterFailed, this, _1));
    m_face.processEvents ();
  }

private:
  ndn::Name m_name;
  ndn::Face m_face;
  ndn::KeyChain m_keychain;
  
  std::vector< ndn::ptr_lib::shared_ptr<ndn::Data> > m_store;

  bool m_verbose;
};

int
main (int argc, char *argv[])
{
  if (argc < 2)
    {
      std::cerr << "Usage: ./ndnputchunks [data_prefix]\n";
      return -1;
    }
  
  try
    {
      ndn::MillisecondsSince1970 time = ndn::getNow();
      
      std::cerr << "Preparing the input..." << std::endl;
      Producer producer (argv[1]);
      std::cerr << "Ready... (took " << ((ndn::getNow() - time)/1000) << " seconds)" << std::endl;
      while(true)
        {
          try
            {
              producer.run (); // this will exit when daemon dies... so try to connect again if possible
            }
          catch (std::exception& e)
            {
              std::cerr << "ERROR: " << e.what () << std::endl;
              // and keep going
              sleep (1);
            }
        }
    }
  catch (std::exception& e)
    {
      std::cerr << "ERROR: " << e.what () << std::endl;
    }
  return 0;
}