#include <fc/udp_socket.hpp>
#include <fc/ip.hpp>
#include <fc/fwd_impl.hpp>
#include <fc/asio.hpp>


namespace fc {
  
  class udp_socket::impl {
    public:
      impl():_sock( fc::asio::default_io_service() ){}

      boost::asio::ip::udp::socket _sock;
  };

  boost::asio::ip::udp::endpoint to_asio_ep( const fc::ip::endpoint& e ) {
    return boost::asio::ip::udp::endpoint(boost::asio::ip::address_v4(e.get_address()), e.port() );
  }
  fc::ip::endpoint to_fc_ep( const boost::asio::ip::udp::endpoint& e ) {
    return fc::ip::endpoint( e.address().to_v4().to_ulong(), e.port() );
  }

  udp_socket::udp_socket() {
  }
  udp_socket::~udp_socket() {
  }

  size_t udp_socket::send_to( const char* b, size_t l, const ip::endpoint& to ) {
    try {
      return my->_sock.send_to( boost::asio::buffer(b, l), to_asio_ep(to) );
    } catch( const boost::system::system_error& e ) {
        if( e.code() == boost::asio::error::would_block ) {
            promise<size_t>::ptr p(new promise<size_t>("udp_socket::send_to"));
            my->_sock.async_send_to( boost::asio::buffer(b,l), to_asio_ep(to), 
                [=]( const boost::system::error_code& ec, size_t bt ) {
                    if( !ec ) p->set_value(bt);
                    else p->set_exception( fc::copy_exception( boost::system::system_error(ec) ) );
                });
            return p->wait();
        }
        throw;
    }
  }
  void udp_socket::open() {
    my->_sock.open( boost::asio::ip::udp::v4() );
    my->_sock.non_blocking(true);
  }
  void udp_socket::set_receive_buffer_size( size_t s ) {
    my->_sock.set_option(boost::asio::socket_base::receive_buffer_size(s) );
  }
  void udp_socket::bind( const fc::ip::endpoint& e ) {
    my->_sock.bind( to_asio_ep(e) );
  }
  size_t udp_socket::receive_from( char* b, size_t l, fc::ip::endpoint& _from ) {
    try {
      boost::asio::ip::udp::endpoint from;
      size_t r =  my->_sock.receive_from( boost::asio::buffer(b, l), from );
      _from = to_fc_ep(from);
      return r;
    } catch( const boost::system::system_error& e ) {
        if( e.code() == boost::asio::error::would_block ) {
            boost::asio::ip::udp::endpoint from;
            promise<size_t>::ptr p(new promise<size_t>("udp_socket::send_to"));
            my->_sock.async_receive_from( boost::asio::buffer(b,l), from,
                [=]( const boost::system::error_code& ec, size_t bt ) {
                    if( !ec ) p->set_value(bt);
                    else p->set_exception( fc::copy_exception( boost::system::system_error(ec) ) );
                });
            auto r =  p->wait();
            _from = to_fc_ep(from);
            return r;
        }
        throw;
    }
  }
  void   udp_socket::close() {
    my->_sock->cancel(); 
    my->_sock.close();
  }

}