/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2012 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: Zhenkai Zhu <zhenkai@cs.ucla.edu>
 *         卞超轶 Chaoyi Bian <bcy@pku.edu.cn>
 *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#include "sync-diff-state.h"
#include "sync-diff-leaf.h"

#include <boost/make_shared.hpp>
#include <boost/foreach.hpp>
#include <boost/assert.hpp>

using namespace boost;

namespace Sync {

DiffState::DiffState ()
{
}

DiffState::~DiffState ()
{
}

DiffStatePtr
DiffState::diff () const
{
  DiffStatePtr ret = make_shared<DiffState> ();

  DiffStatePtr state = m_next;
  while (state != 0)
    {
      *ret += *state;
      state = state->m_next;
    }

  return ret;
}

DiffState &
DiffState::operator += (const DiffState &state)
{
  return *this;
}
  
// from State
void
DiffState::update (NameInfoConstPtr info, const SeqNo &seq)
{
  m_leaves.erase (*info);

  DiffLeafPtr leaf = make_shared<DiffLeaf> (info, cref (seq));
  m_leaves.insert (leaf);
}

void
DiffState::remove (NameInfoConstPtr info)
{
  m_leaves.erase (*info);

  DiffLeafPtr leaf = make_shared<DiffLeaf> (info);
  m_leaves.insert (leaf);
}

#ifdef _DEBUG
#define DEBUG_ENDL os << "\n";
#else
#define DEBUG_ENDL
#endif

std::ostream &
operator << (std::ostream &os, const DiffState &state)
{
  os << "<state type=\"diff\">"; DEBUG_ENDL;
  
  BOOST_FOREACH (shared_ptr<const Leaf> _leaf, state.getLeaves ())
    {
      shared_ptr<const DiffLeaf> leaf = dynamic_pointer_cast<const DiffLeaf> (_leaf);
      BOOST_ASSERT (leaf != 0);

      os << "<item action=\"" << leaf->getOperation () << "\">"; DEBUG_ENDL;
      os << "<name>" << leaf->getInfo () << "</name>"; DEBUG_ENDL;
      if (leaf->getOperation () == UPDATE)
        {
          os << "<seq>" << leaf->getSeq () << "</seq>"; DEBUG_ENDL;
        }
      os << "</item>"; DEBUG_ENDL;
    }
  os << "</state>";
}


} // ns3