/* -*- c++ -*- */
/*
 * Copyright 2007-2010,2013 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_UDP_SOURCE_IMPL_H
#define INCLUDED_GR_UDP_SOURCE_IMPL_H

#include <gnuradio/blocks/udp_source.h>
#include <gnuradio/thread/thread.h>
#include <boost/asio.hpp>
#include <boost/format.hpp>

namespace gr {
namespace blocks {

class udp_source_impl : public udp_source
{
private:
    size_t d_itemsize;
    int d_payload_size; // maximum transmission unit (packet length)
    bool d_eof;         // look for an EOF signal
    bool d_connected;   // are we connected?
    char* d_rxbuf;      // get UDP buffer items
    char* d_residbuf;   // hold buffer between calls
    ssize_t d_residual; // hold information about number of bytes stored in residbuf
    ssize_t d_sent;     // track how much of d_residbuf we've outputted

    static const int
        BUF_SIZE_PAYLOADS; //!< The d_residbuf size in multiples of d_payload_size

    std::string d_host;
    unsigned short d_port;

    boost::asio::ip::udp::socket* d_socket;
    boost::asio::ip::udp::endpoint d_endpoint;
    boost::asio::ip::udp::endpoint d_endpoint_rcvd;
    boost::asio::io_service d_io_service;

    gr::thread::condition_variable d_cond_wait;
    gr::thread::mutex d_udp_mutex;
    gr::thread::thread d_udp_thread;

    void start_receive();
    void handle_read(const boost::system::error_code& error, size_t bytes_transferred);
    void run_io_service() { d_io_service.run(); }

public:
    udp_source_impl(
        size_t itemsize, const std::string& host, int port, int payload_size, bool eof);
    ~udp_source_impl();

    void connect(const std::string& host, int port);
    void disconnect();

    int payload_size() { return d_payload_size; }
    int get_port();

    int work(int noutput_items,
             gr_vector_const_void_star& input_items,
             gr_vector_void_star& output_items);
};

} /* namespace blocks */
} /* namespace gr */

#endif /* INCLUDED_GR_UDP_SOURCE_H */
