/* -*- c++ -*- */
/*
 * Copyright 2006,2010-2013,2018 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 "pll_carriertracking_cc_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/math.h>
#include <gnuradio/sincos.h>

#include <cmath>

namespace gr {
namespace analog {

pll_carriertracking_cc::sptr
pll_carriertracking_cc::make(float loop_bw, float max_freq, float min_freq)
{
    return gnuradio::get_initial_sptr(
        new pll_carriertracking_cc_impl(loop_bw, max_freq, min_freq));
}

pll_carriertracking_cc_impl::pll_carriertracking_cc_impl(float loop_bw,
                                                         float max_freq,
                                                         float min_freq)
    : sync_block("pll_carriertracking_cc",
                 io_signature::make(1, 1, sizeof(gr_complex)),
                 io_signature::make(1, 1, sizeof(gr_complex))),
      blocks::control_loop(loop_bw, max_freq, min_freq),
      d_locksig(0),
      d_lock_threshold(0),
      d_squelch_enable(false)
{
}

pll_carriertracking_cc_impl::~pll_carriertracking_cc_impl() {}

float pll_carriertracking_cc_impl::mod_2pi(float in)
{
    if (in > GR_M_PI)
        return in - GR_M_TWOPI;
    else if (in < -GR_M_PI)
        return in + GR_M_TWOPI;
    else
        return in;
}

float pll_carriertracking_cc_impl::phase_detector(gr_complex sample, float ref_phase)
{
    float sample_phase;
    //  sample_phase = atan2(sample.imag(),sample.real());
    sample_phase = gr::fast_atan2f(sample.imag(), sample.real());
    return mod_2pi(sample_phase - ref_phase);
}

bool pll_carriertracking_cc_impl::lock_detector(void)
{
    return (fabsf(d_locksig) > d_lock_threshold);
}

bool pll_carriertracking_cc_impl::squelch_enable(bool set_squelch)
{
    return d_squelch_enable = set_squelch;
}

float pll_carriertracking_cc_impl::set_lock_threshold(float threshold)
{
    return d_lock_threshold = threshold;
}

int pll_carriertracking_cc_impl::work(int noutput_items,
                                      gr_vector_const_void_star& input_items,
                                      gr_vector_void_star& output_items)
{
    const gr_complex* iptr = (gr_complex*)input_items[0];
    gr_complex* optr = (gr_complex*)output_items[0];

    float error;
    float t_imag, t_real;

    for (int i = 0; i < noutput_items; i++) {
        gr::sincosf(d_phase, &t_imag, &t_real);
        optr[i] = iptr[i] * gr_complex(t_real, -t_imag);

        error = phase_detector(iptr[i], d_phase);

        advance_loop(error);
        phase_wrap();
        frequency_limit();

        d_locksig = d_locksig * (1.0 - d_alpha) +
                    d_alpha * (iptr[i].real() * t_real + iptr[i].imag() * t_imag);

        if ((d_squelch_enable) && !lock_detector())
            optr[i] = 0;
    }
    return noutput_items;
}

void pll_carriertracking_cc_impl::set_loop_bandwidth(float bw)
{
    blocks::control_loop::set_loop_bandwidth(bw);
}

void pll_carriertracking_cc_impl::set_damping_factor(float df)
{
    blocks::control_loop::set_damping_factor(df);
}

void pll_carriertracking_cc_impl::set_alpha(float alpha)
{
    blocks::control_loop::set_alpha(alpha);
}

void pll_carriertracking_cc_impl::set_beta(float beta)
{
    blocks::control_loop::set_beta(beta);
}

void pll_carriertracking_cc_impl::set_frequency(float freq)
{
    blocks::control_loop::set_frequency(freq);
}

void pll_carriertracking_cc_impl::set_phase(float phase)
{
    blocks::control_loop::set_phase(phase);
}

void pll_carriertracking_cc_impl::set_min_freq(float freq)
{
    blocks::control_loop::set_min_freq(freq);
}

void pll_carriertracking_cc_impl::set_max_freq(float freq)
{
    blocks::control_loop::set_max_freq(freq);
}


float pll_carriertracking_cc_impl::get_loop_bandwidth() const
{
    return blocks::control_loop::get_loop_bandwidth();
}

float pll_carriertracking_cc_impl::get_damping_factor() const
{
    return blocks::control_loop::get_damping_factor();
}

float pll_carriertracking_cc_impl::get_alpha() const
{
    return blocks::control_loop::get_alpha();
}

float pll_carriertracking_cc_impl::get_beta() const
{
    return blocks::control_loop::get_beta();
}

float pll_carriertracking_cc_impl::get_frequency() const
{
    return blocks::control_loop::get_frequency();
}

float pll_carriertracking_cc_impl::get_phase() const
{
    return blocks::control_loop::get_phase();
}

float pll_carriertracking_cc_impl::get_min_freq() const
{
    return blocks::control_loop::get_min_freq();
}

float pll_carriertracking_cc_impl::get_max_freq() const
{
    return blocks::control_loop::get_max_freq();
}

} /* namespace analog */
} /* namespace gr */
