/* -*- c++ -*- */
/*
 * Copyright 2006,2010,2013 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 "bin_statistics_f_impl.h"
#include <gnuradio/io_signature.h>
#include <string.h>

namespace gr {
namespace blocks {

bin_statistics_f::sptr bin_statistics_f::make(unsigned int vlen,
                                              msg_queue::sptr msgq,
                                              feval_dd* tune,
                                              size_t tune_delay,
                                              size_t dwell_delay)
{
    return gnuradio::get_initial_sptr(
        new bin_statistics_f_impl(vlen, msgq, tune, tune_delay, dwell_delay));
}

bin_statistics_f_impl::bin_statistics_f_impl(unsigned int vlen,
                                             msg_queue::sptr msgq,
                                             feval_dd* tune,
                                             size_t tune_delay,
                                             size_t dwell_delay)
    : sync_block("bin_statistics_f",
                 io_signature::make(1, 1, sizeof(float) * vlen),
                 io_signature::make(0, 0, 0)),
      d_vlen(vlen),
      d_msgq(msgq),
      d_tune(tune),
      d_tune_delay(tune_delay),
      d_dwell_delay(dwell_delay),
      d_center_freq(0),
      d_delay(0),
      d_max(vlen)
{
    enter_init();
}

bin_statistics_f_impl::~bin_statistics_f_impl() {}

void bin_statistics_f_impl::enter_init()
{
    d_state = ST_INIT;
    d_delay = 0;
}

void bin_statistics_f_impl::enter_tune_delay()
{
    d_state = ST_TUNE_DELAY;
    d_delay = d_tune_delay;
    d_center_freq = d_tune->calleval(0);
}

void bin_statistics_f_impl::enter_dwell_delay()
{
    d_state = ST_DWELL_DELAY;
    d_delay = d_dwell_delay;
    reset_stats();
}

void bin_statistics_f_impl::leave_dwell_delay() { send_stats(); }

int bin_statistics_f_impl::work(int noutput_items,
                                gr_vector_const_void_star& input_items,
                                gr_vector_void_star& output_items)
{
    const float* input = (const float*)input_items[0];
    size_t vlen = d_max.size();

    int n = 0;
    int t;

    while (n < noutput_items) {
        switch (d_state) {

        case ST_INIT:
            enter_tune_delay();
            break;

        case ST_TUNE_DELAY:
            t = std::min(noutput_items - n, int(d_delay));
            n += t;
            d_delay -= t;
            if (d_delay == 0)
                enter_dwell_delay();
            break;

        case ST_DWELL_DELAY:
            t = std::min(noutput_items - n, int(d_delay));
            for (int i = 0; i < t; i++) {
                accrue_stats(&input[n * vlen]);
                n++;
            }
            d_delay -= t;
            if (d_delay == 0) {
                leave_dwell_delay();
                enter_tune_delay();
            }
            break;

        default:
            assert(0);
        }
    }

    return noutput_items;
}

//////////////////////////////////////////////////////////////////////////
//           virtual methods for gathering stats
//////////////////////////////////////////////////////////////////////////

void bin_statistics_f_impl::reset_stats()
{
    for (size_t i = 0; i < vlen(); i++) {
        d_max[i] = 0;
    }
}

void bin_statistics_f_impl::accrue_stats(const float* input)
{
    for (size_t i = 0; i < vlen(); i++) {
        d_max[i] = std::max(d_max[i], input[i]); // compute per bin maxima
    }
}

void bin_statistics_f_impl::send_stats()
{
    if (msgq()->full_p()) // if the queue is full, don't block, drop the data...
        return;

    // build & send a message
    message::sptr msg = message::make(0, center_freq(), vlen(), vlen() * sizeof(float));
    memcpy(msg->msg(), &d_max[0], vlen() * sizeof(float));
    msgq()->insert_tail(msg);
}

} /* namespace blocks */
} /* namespace gr */
