/* -*- c++ -*- */
/*
 * Copyright 2014 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 "fft_filter_ccf_impl.h"
#include <gnuradio/io_signature.h>

#include <assert.h>
#include <math.h>
#include <stdexcept>

namespace gr {
namespace filter {

fft_filter_ccf::sptr
fft_filter_ccf::make(int decimation, const std::vector<float>& taps, int nthreads)
{
    return gnuradio::get_initial_sptr(
        new fft_filter_ccf_impl(decimation, taps, nthreads));
}

fft_filter_ccf_impl::fft_filter_ccf_impl(int decimation,
                                         const std::vector<float>& taps,
                                         int nthreads)
    : sync_decimator("fft_filter_ccf",
                     io_signature::make(1, 1, sizeof(gr_complex)),
                     io_signature::make(1, 1, sizeof(gr_complex)),
                     decimation),
      d_updated(false)
{
    set_history(1);

    d_filter = new kernel::fft_filter_ccf(decimation, taps, nthreads);

    d_new_taps = taps;
    d_nsamples = d_filter->set_taps(taps);
    set_output_multiple(d_nsamples);
}

fft_filter_ccf_impl::~fft_filter_ccf_impl() { delete d_filter; }

void fft_filter_ccf_impl::set_taps(const std::vector<float>& taps)
{
    d_new_taps = taps;
    d_updated = true;
}

std::vector<float> fft_filter_ccf_impl::taps() const { return d_new_taps; }

void fft_filter_ccf_impl::set_nthreads(int n)
{
    if (d_filter)
        d_filter->set_nthreads(n);
}

int fft_filter_ccf_impl::nthreads() const
{
    if (d_filter)
        return d_filter->nthreads();
    else
        return 0;
}

int fft_filter_ccf_impl::work(int noutput_items,
                              gr_vector_const_void_star& input_items,
                              gr_vector_void_star& output_items)
{
    const gr_complex* in = (const gr_complex*)input_items[0];
    gr_complex* out = (gr_complex*)output_items[0];

    if (d_updated) {
        d_nsamples = d_filter->set_taps(d_new_taps);
        d_updated = false;
        set_output_multiple(d_nsamples);
        return 0; // output multiple may have changed
    }

    d_filter->filter(noutput_items, in, out);

    return noutput_items;
}

} /* namespace filter */
} /* namespace gr */
