/* -*- c++ -*- */
/*
 * Copyright 2013,2014,2019 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio.
 *
 * This 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.
 *
 * This software 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "rep_msg_sink_impl.h"
#include "tag_headers.h"
#include <gnuradio/io_signature.h>

namespace gr {
namespace zeromq {

rep_msg_sink::sptr rep_msg_sink::make(char* address, int timeout)
{
    return gnuradio::get_initial_sptr(new rep_msg_sink_impl(address, timeout));
}

rep_msg_sink_impl::rep_msg_sink_impl(char* address, int timeout)
    : gr::block("rep_msg_sink",
                gr::io_signature::make(0, 0, 0),
                gr::io_signature::make(0, 0, 0)),
      d_timeout(timeout),
      d_port(pmt::mp("in"))
{
    int major, minor, patch;
    zmq::version(&major, &minor, &patch);

    if (major < 3) {
        d_timeout = timeout * 1000;
    }

    d_context = new zmq::context_t(1);
    d_socket = new zmq::socket_t(*d_context, ZMQ_REP);

    int time = 0;
    d_socket->setsockopt(ZMQ_LINGER, &time, sizeof(time));
    d_socket->bind(address);

    message_port_register_in(d_port);
}

rep_msg_sink_impl::~rep_msg_sink_impl()
{
    d_socket->close();
    delete d_socket;
    delete d_context;
}

bool rep_msg_sink_impl::start()
{
    d_finished = false;
    d_thread = new boost::thread(boost::bind(&rep_msg_sink_impl::readloop, this));
    return true;
}

bool rep_msg_sink_impl::stop()
{
    d_finished = true;
    d_thread->join();
    return true;
}

void rep_msg_sink_impl::readloop()
{
    while (!d_finished) {

        // while we have data, wait for query...
        while (!empty_p(d_port)) {

            // wait for query...
            zmq::pollitem_t items[] = {
                { static_cast<void*>(*d_socket), 0, ZMQ_POLLIN, 0 }
            };
            zmq::poll(&items[0], 1, d_timeout);

            //  If we got a reply, process
            if (items[0].revents & ZMQ_POLLIN) {

                // receive data request
                zmq::message_t request;
#if USE_NEW_CPPZMQ_SEND_RECV
                d_socket->recv(request);
#else
                d_socket->recv(&request);
#endif

                int req_output_items = *(static_cast<int*>(request.data()));
                if (req_output_items != 1)
                    throw std::runtime_error(
                        "Request was not 1 msg for rep/req request!!");

                // create message copy and send
                pmt::pmt_t msg = delete_head_nowait(d_port);
                std::stringbuf sb("");
                pmt::serialize(msg, sb);
                std::string s = sb.str();
                zmq::message_t zmsg(s.size());
                memcpy(zmsg.data(), s.c_str(), s.size());
                d_socket->send(zmsg);
            } // if req
        }     // while !empty

    } // while !d_finished
}

} /* namespace zeromq */
} /* namespace gr */
