/* -*- c++ -*- */
/*
 * Copyright 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.
 */

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

#include "pdu_filter_impl.h"
#include <gnuradio/blocks/pdu.h>
#include <gnuradio/io_signature.h>

namespace gr {
namespace blocks {

pdu_filter::sptr pdu_filter::make(pmt::pmt_t k, pmt::pmt_t v, bool invert)
{
    return gnuradio::get_initial_sptr(new pdu_filter_impl(k, v, invert));
}

pdu_filter_impl::pdu_filter_impl(pmt::pmt_t k, pmt::pmt_t v, bool invert)
    : block("pdu_filter", io_signature::make(0, 0, 0), io_signature::make(0, 0, 0)),
      d_k(k),
      d_v(v),
      d_invert(invert)
{
    message_port_register_out(pdu::pdu_port_id());
    message_port_register_in(pdu::pdu_port_id());
    set_msg_handler(pdu::pdu_port_id(),
                    boost::bind(&pdu_filter_impl::handle_msg, this, _1));
}

void pdu_filter_impl::handle_msg(pmt::pmt_t pdu)
{
    pmt::pmt_t meta = pmt::car(pdu);
    bool output = d_invert;

    // check base type
    // key exists
    // value matches
    if (pmt::is_dict(meta) && dict_has_key(meta, d_k) &&
        pmt::eqv(pmt::dict_ref(meta, d_k, pmt::PMT_NIL), d_v)) {
        output = !d_invert;
    }

    // if all tests pass, propagate the pdu
    if (output) {
        message_port_pub(pdu::pdu_port_id(), pdu);
    }
}

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