/* -*- c++ -*- */
/*
 * Copyright 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

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

#include "tagged_decoder_impl.h"
#include <gnuradio/io_signature.h>
#include <cmath>
#include <cstdio>

namespace gr {
namespace fec {

tagged_decoder::sptr tagged_decoder::make(generic_decoder::sptr my_decoder,
                                          size_t input_item_size,
                                          size_t output_item_size,
                                          const std::string& lengthtagname,
                                          int mtu)
{
    return gnuradio::make_block_sptr<tagged_decoder_impl>(
        my_decoder, input_item_size, output_item_size, lengthtagname, mtu);
}

tagged_decoder_impl::tagged_decoder_impl(generic_decoder::sptr my_decoder,
                                         size_t input_item_size,
                                         size_t output_item_size,
                                         const std::string& lengthtagname,
                                         int mtu)
    : tagged_stream_block("fec_tagged_decoder",
                          io_signature::make(1, 1, input_item_size),
                          io_signature::make(1, 1, output_item_size),
                          lengthtagname),
      d_mtu(mtu)
{
    d_decoder = my_decoder;
    d_decoder->set_frame_size(d_mtu * 8);

    set_relative_rate(d_decoder->rate());
}

int tagged_decoder_impl::calculate_output_stream_length(const gr_vector_int& ninput_items)
{
    if (std::lround(ninput_items[0] * d_decoder->rate()) > (d_mtu * 8)) {
        throw std::runtime_error("tagged_encoder: received frame is larger than MTU.");
    }
    int diff = std::lround(d_decoder->rate() * d_decoder->get_input_size()) -
               d_decoder->get_output_size();
    d_decoder->set_frame_size(std::lround(ninput_items[0] * d_decoder->rate()) - diff);
    return d_decoder->get_output_size();
}

tagged_decoder_impl::~tagged_decoder_impl() {}

int tagged_decoder_impl::work(int noutput_items,
                              gr_vector_int& ninput_items,
                              gr_vector_const_void_star& input_items,
                              gr_vector_void_star& output_items)
{
    const unsigned char* in = (const unsigned char*)input_items[0];
    unsigned char* out = (unsigned char*)output_items[0];

    d_debug_logger->debug(
        "{:d}, {:d}, {:d}", noutput_items, ninput_items[0], d_decoder->get_output_size());

    d_decoder->generic_work((const void*)in, (void*)out);

    return d_decoder->get_output_size();
}

} /* namespace fec */
} /* namespace gr */
