/*!
 * \file pass_through.cc
 * \brief Implementation of a block that just puts its input in its
 *        output.
 * \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
 *
 *
 * -----------------------------------------------------------------------------
 *
 * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
 * This file is part of GNSS-SDR.
 *
 * Copyright (C) 2010-2020  (see AUTHORS file for a list of contributors)
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * -----------------------------------------------------------------------------
 */

#include "pass_through.h"
#include "configuration_interface.h"
#include <gnuradio/gr_complex.h>
#include <volk/volk_complex.h>
#include <cstdint>  // for int8_t
#include <ostream>  // for operator<<

#if USE_GLOG_AND_GFLAGS
#include <glog/logging.h>
#else
#include <absl/log/log.h>
#endif

Pass_Through::Pass_Through(const ConfigurationInterface* configuration,
    const std::string& role,
    unsigned int in_streams,
    unsigned int out_streams)
    : role_(role),
      in_streams_(in_streams),
      out_streams_(out_streams),
      inverted_spectrum(configuration->property(role + ".inverted_spectrum", false))
{
    const std::string default_item_type("gr_complex");
    item_type_ = configuration->property(role + ".item_type", default_item_type);

    if (item_type_ == "float")
        {
            item_size_ = sizeof(float);
        }
    else if (item_type_ == "gr_complex")
        {
            item_size_ = sizeof(gr_complex);
            if (inverted_spectrum)
                {
                    conjugate_cc_ = make_conjugate_cc();
                }
        }
    else if ((item_type_ == "short") || (item_type_ == "ishort"))
        {
            item_size_ = sizeof(int16_t);
        }
    else if (item_type_ == "cshort")
        {
            item_size_ = sizeof(lv_16sc_t);
            if (inverted_spectrum)
                {
                    conjugate_sc_ = make_conjugate_sc();
                }
        }
    else if ((item_type_ == "byte") || (item_type_ == "ibyte"))
        {
            item_size_ = sizeof(int8_t);
        }
    else if (item_type_ == "cbyte")
        {
            item_size_ = sizeof(lv_8sc_t);
            if (inverted_spectrum)
                {
                    conjugate_ic_ = make_conjugate_ic();
                }
        }
    else
        {
            LOG(WARNING) << item_type_ << " unrecognized item type. Using float";
            item_size_ = sizeof(float);
        }

    kludge_copy_ = gr::blocks::copy::make(item_size_);
    const uint64_t max_source_buffer_samples = configuration->property("GNSS-SDR.max_source_buffer_samples", 0);
    if (max_source_buffer_samples > 0)
        {
            kludge_copy_->set_max_output_buffer(max_source_buffer_samples);
            LOG(INFO) << "Set signal conditioner max output buffer to " << max_source_buffer_samples;
        }
    DLOG(INFO) << "kludge_copy(" << kludge_copy_->unique_id() << ")";
    if (in_streams_ > 1)
        {
            LOG(ERROR) << "This implementation only supports one input stream but it is set to " << in_streams_;
        }
    if (out_streams_ > 1)
        {
            LOG(ERROR) << "This implementation only supports one output stream but it is set to " << out_streams_;
        }
}


void Pass_Through::connect(gr::top_block_sptr top_block)
{
    if (top_block)
        { /* top_block is not null */
        };
    DLOG(INFO) << "nothing to connect internally";
}


void Pass_Through::disconnect(gr::top_block_sptr top_block)
{
    if (top_block)
        { /* top_block is not null */
        };
    // Nothing to disconnect
}


gr::basic_block_sptr Pass_Through::get_left_block()
{
    if (inverted_spectrum)
        {
            if (item_type_ == "gr_complex")
                {
                    return conjugate_cc_;
                }
            if (item_type_ == "cshort")
                {
                    return conjugate_sc_;
                }
            if (item_type_ == "cbyte")
                {
                    return conjugate_ic_;
                }
            LOG(WARNING) << "Setting inverted_spectrum to true with item_type "
                         << item_type_ << " is not defined and has no effect.";
        }

    return kludge_copy_;
}


gr::basic_block_sptr Pass_Through::get_right_block()
{
    if (inverted_spectrum)
        {
            if (item_type_ == "gr_complex")
                {
                    return conjugate_cc_;
                }
            if (item_type_ == "cshort")
                {
                    return conjugate_sc_;
                }
            if (item_type_ == "cbyte")
                {
                    return conjugate_ic_;
                }
            DLOG(WARNING) << "Setting inverted_spectrum to true with item_type "
                          << item_type_ << " is not defined and has no effect.";
        }

    return kludge_copy_;
}