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/*
    This file is part of the TOBI Interface A (TiA) library.

    Commercial Usage
    Licensees holding valid Graz University of Technology Commercial
    licenses may use this file in accordance with the Graz University
    of Technology Commercial License Agreement provided with the
    Software or, alternatively, in accordance with the terms contained in
    a written agreement between you and Graz University of Technology.

    --------------------------------------------------

    GNU Lesser General Public License Usage
    Alternatively, this file may be used under the terms of the GNU Lesser
    General Public License version 3.0 as published by the Free Software
    Foundation and appearing in the file lgpl.txt included in the
    packaging of this file.  Please review the following information to
    ensure the GNU General Public License version 3.0 requirements will be
    met: http://www.gnu.org/copyleft/lgpl.html.

    In case of GNU Lesser General Public License Usage ,the TiA 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 General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with the TiA library. If not, see <http://www.gnu.org/licenses/>.

    Copyright 2010 Graz University of Technology
    Contact: TiA@tobi-project.org
*/

// Standard
#include <assert.h>
#include <iostream>

// boost
#include <boost/bind.hpp>

// local
#include "tia-private/network/tcp_data_server.h"
#include "tia/data_packet_interface.h"

namespace tia
{
using std::cout;
using std::cerr;
using std::endl;
using std::make_pair;

using boost::uint32_t;

//-----------------------------------------------------------------------------

TCPDataConnection::TCPDataConnection(boost::asio::io_service& io_service) :
    TCPServer(io_service)
{}


//-----------------------------------------------------------------------------

void TCPDataConnection::handleWrite(const boost::system::error_code& ec,
    std::size_t /*bytes_transferred*/)
{
  if (ec)
  {
    cerr << "TCPDataConnection::handleWrite: sending data packet to client @"
              << remote_endpoint_.address().to_string() << ":" << remote_endpoint_.port()
              << " failed - closing connection -- Error:" << endl
              << "--> " << ec.message() << endl;

    boost::unique_lock<boost::mutex> lock(mutex_);

    // Initiate graceful connection closure.
    boost::system::error_code ignored_ec;
    connection_->socket().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
    connection_->socket().close();
  }
}

//-----------------------------------------------------------------------------

void TCPDataConnection::sendDataPacket(DataPacket& packet)
{
  boost::unique_lock<boost::mutex> lock(mutex_);

  if (!connection_ || !connection_->socket().is_open()) return;

  void* data = packet.getRaw();
  uint32_t size = packet.getRawMemorySize();

  assert(data != 0);
  assert(size != 0);

#ifdef DEBUG
  std::cout << "TCPDataConnection::sendDataPacket: sending data packet to "
                << remote_endpoint_.address().to_string() << ":" << remote_endpoint_.port()
                << std::endl;
#endif

  connection_->socket().async_send(boost::asio::buffer(data, size),
      boost::bind(&TCPDataConnection::handleWrite,
          shared_from_this(),
          boost::asio::placeholders::error,
          boost::asio::placeholders::bytes_transferred));
}

//-----------------------------------------------------------------------------

void TCPDataConnection::startAccept()
{
  TCPConnection::pointer new_connection = TCPConnection::create(io_service_);

  acceptor_.async_accept(new_connection->socket(), boost::bind(
      &TCPDataConnection::handleAccept, shared_from_this(), new_connection,
      boost::asio::placeholders::error));
}

//-----------------------------------------------------------------------------

void TCPDataConnection::handleAccept(const TCPConnection::pointer& new_connection,
      const boost::system::error_code& error)
{
  if (error)
  {
    cerr << "TCPDataConnection::handleAccept: cannot accept connection on "
         << localEndpoint().address().to_string() << ":" << localEndpoint().port()
         << "-- Error:" << endl
         << error.message() << endl;

    startAccept();
    return;
  }

  boost::unique_lock<boost::mutex> lock(mutex_);

  connection_ = new_connection;
  remote_endpoint_ = connection_->socket().remote_endpoint();
  boost::asio::socket_base::send_buffer_size buffer_option(BUFFER_SIZE);
  connection_->socket().set_option(buffer_option);

  boost::asio::ip::tcp::no_delay delay_option(true);
  connection_->socket().set_option(delay_option);

  boost::asio::socket_base::linger linger_option(false, 0);
  connection_->socket().set_option(linger_option);

#ifdef DEBUG
  cout << "TCPDataConnection::handleAccept: client @"
       << remote_endpoint_.address().to_string() << ":" << remote_endpoint_.port()
       << " connected on  "
       << connection_->socket().local_endpoint().address().to_string()
       << connection_->socket().local_endpoint().port();
#endif
}
//-----------------------------------------------------------------------------

TCPDataServer::TCPDataServer(boost::asio::io_service& io_service) :
  io_service_(io_service)
{}

//-----------------------------------------------------------------------------

bool TCPDataServer::connected(const boost::asio::ip::tcp::endpoint& endpoint) const
{
  boost::unique_lock<boost::mutex> lock(mutex_);
  ClientConnectionMap::const_iterator it = connections_.find(endpoint);
  if (it != connections_.end())
  {
    throw(std::invalid_argument("No connection with that local endpoint"));
  }

  TCPDataConnection::pointer connection = (*it).second;
  return connection->connected();
}

//-----------------------------------------------------------------------------

boost::asio::ip::tcp::endpoint TCPDataServer::addConnection()
{
  boost::unique_lock<boost::mutex> lock(mutex_);
  TCPDataConnection::pointer connection = TCPDataConnection::create(io_service_);

  boost::asio::ip::tcp::endpoint local_endpoint;

  try
  {
    connection->bind(0);
    local_endpoint = connection->localEndpoint();
  }
  catch (boost::exception& e)
  {
    throw (std::runtime_error("Could not bind socket - adding new connection failed"));
  }

  connection->listen();

  connections_.insert(make_pair(local_endpoint, connection));

  return local_endpoint;
}

//-----------------------------------------------------------------------------

void TCPDataServer::removeConnection(const boost::asio::ip::tcp::endpoint& endpoint)
{
  boost::unique_lock<boost::mutex> lock(mutex_);
  ClientConnectionMap::iterator it = connections_.find(endpoint);
  if (it == connections_.end())
  {
    throw(std::invalid_argument("No connection with that local endpoint"));
  }

  connections_.erase(it);

  connections_transmission_enabled_.erase(endpoint);
}

//-----------------------------------------------------------------------------

void TCPDataServer::enableTransmission(const boost::asio::ip::tcp::endpoint& endpoint,
                                       bool enable)
{
  boost::unique_lock<boost::mutex> lock(mutex_);

  ClientConnectionMap::iterator it = connections_.find(endpoint);
  if (it == connections_.end())
  {
    throw(std::invalid_argument("No connection with that local endpoint"));
  }

  if (enable)
  {
    connections_transmission_enabled_[(*it).first] = (*it).second;
  }
  else
  {
    connections_transmission_enabled_.erase((*it).first);
  }
}

//-----------------------------------------------------------------------------

void TCPDataServer::sendDataPacket(DataPacket& packet)
{
  // lock the connection list
  boost::unique_lock<boost::mutex> lock(mutex_);

  ClientConnectionMap::iterator it  = connections_transmission_enabled_.begin();
  ClientConnectionMap::iterator end = connections_transmission_enabled_.end();

  for (; it != end; ++it)
  {
    TCPDataConnection::pointer connection = (*it).second;
    connection->sendDataPacket(packet);
  }
}

//-----------------------------------------------------------------------------

} // Namespace tobiss