/* -*- c++ -*- */
/*
 * Copyright 2004,2010-2012 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 "constellation_metrics_cf_impl.h"
#include <gnuradio/io_signature.h>
#include <assert.h>
#include <iostream>
#include <stdexcept>

namespace gr {
namespace trellis {

constellation_metrics_cf::sptr
constellation_metrics_cf::make(digital::constellation_sptr constellation,
                               digital::trellis_metric_type_t TYPE)
{
    return gnuradio::get_initial_sptr(
        new constellation_metrics_cf_impl(constellation, TYPE));
}

constellation_metrics_cf_impl::constellation_metrics_cf_impl(
    digital::constellation_sptr constellation, digital::trellis_metric_type_t TYPE)
    : block("constellation_metrics_cf",
            io_signature::make(1, -1, sizeof(gr_complex)),
            io_signature::make(1, -1, sizeof(float))),
      d_constellation(constellation),
      d_TYPE(TYPE),
      d_O(constellation->arity()),
      d_D(constellation->dimensionality())
{
    set_relative_rate((uint64_t)d_O, (uint64_t)d_D);
    set_output_multiple((int)d_O);
}

constellation_metrics_cf_impl::~constellation_metrics_cf_impl() {}

void constellation_metrics_cf_impl::forecast(int noutput_items,
                                             gr_vector_int& ninput_items_required)
{
    assert(noutput_items % d_O == 0);

    unsigned int input_required = d_D * noutput_items / d_O;
    unsigned int ninputs = ninput_items_required.size();
    for (unsigned int i = 0; i < ninputs; i++)
        ninput_items_required[i] = input_required;
}

int constellation_metrics_cf_impl::general_work(int noutput_items,
                                                gr_vector_int& ninput_items,
                                                gr_vector_const_void_star& input_items,
                                                gr_vector_void_star& output_items)
{
    unsigned int nstreams = input_items.size();

    for (unsigned int m = 0; m < nstreams; m++) {
        const gr_complex* in = (gr_complex*)input_items[m];
        float* out = (float*)output_items[m];

        for (unsigned int i = 0; i < noutput_items / d_O; i++) {
            d_constellation->calc_metric(&(in[i * d_D]), &(out[i * d_O]), d_TYPE);
        }
    }

    consume_each(d_D * noutput_items / d_O);
    return noutput_items;
}

} /* namespace trellis */
} /* namespace gr */
