/* -*- c++ -*- */
/*
 * Copyright 2004 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 <gsm_receiver_cf.h>
#include <gr_io_signature.h>

gsm_receiver_cf_sptr 
gsm_make_receiver_cf ()
{
  return gsm_receiver_cf_sptr (new gsm_receiver_cf ());
}

static const int MIN_IN = 1;	// mininum number of input streams
static const int MAX_IN = 1;	// maximum number of input streams
static const int MIN_OUT = 1;	// minimum number of output streams
static const int MAX_OUT = 1;	// maximum number of output streams

/*
 * The private constructor
 */
gsm_receiver_cf::gsm_receiver_cf ()
  : gr_block ("gsm_receiver",
	      gr_make_io_signature (MIN_IN, MAX_IN, sizeof (gr_complex)),
	      gr_make_io_signature (MIN_OUT, MAX_OUT, sizeof (float)))
{
}

/*
 * Virtual destructor.
 */
gsm_receiver_cf::~gsm_receiver_cf ()
{
}

int 
gsm_receiver_cf::general_work (int noutput_items,
			       gr_vector_int &ninput_items,
			       gr_vector_const_void_star &input_items,
			       gr_vector_void_star &output_items)
{
  const float *in = (const float *) input_items[0];
  float *out = (float *) output_items[0];

  for (int i = 0; i < noutput_items; i++){
    out[i] = in[i] * in[i];
  }

  consume_each (noutput_items);

  return noutput_items;
}


bool gsm_receiver_cf::get_fcch_burst()
{
  int hit_count = 0;
  int miss_count = 0;
  int start_pos = -1;
/*
  for ( int i=0; i < BBUF_SIZE; i++ ) {
      if ( d_burst_buffer[i] > 0 ) {
          if ( ! hit_count++ )
            start_pos = i;
        } else {
          if ( hit_count >= FCCH_HITS_NEEDED ) {
              break;
            } else
            if ( ++miss_count > FCCH_MAX_MISSES ) {
                start_pos = -1;
                hit_count = miss_count = 0;
              }
        }
    }

  //Do we have a match?
  if ( start_pos >= 0 ) {
      //Is it within range? (we know it's long enough then too)
      if ( start_pos < 2*MAX_CORR_DIST ) {
          d_burst_start = start_pos;
          d_bbuf_pos = 0; //load buffer from start
          return FCCH;

        } else {
          //TODO: don't shift a tiny amount
          shift_burst( start_pos - MAX_CORR_DIST );
        }
    } else {
      //Didn't find anything
      d_burst_start = MAX_CORR_DIST;
      d_bbuf_pos = 0; //load buffer from start
    }

  return UNKNOWN;
*/
}