/*                                                                              
 * simile : windowed similarity comparison                                      
 * Copyright (c) 2005, Dr Edward Kelly <morph_2016@yahoo.co.uk>
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, 
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice, this list 
 * of conditions and the following disclaimer in the documentation and/or other materials 
 * 
 * provided with the distribution.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "m_pd.h"

typedef struct _simile {
  t_object  x_obj;
  t_float x_win;
  t_float min;
  t_float sign;
  t_float x_in1;
  t_float x_in2;
  t_float x_result;
  t_outlet *x_sim, *x_sign;
} t_simile;

void simile_float(t_simile *x, t_floatarg in1) {
  x->x_in1 = in1;
  x->x_win = x->x_win > 0 ? x->x_win : 0.01; /* defaults to 0.01 so that we avoid /0 errors */
  x->min = ( x->x_in1 > x->x_in2 ) ? (x->x_in1 - x->x_in2) : (x->x_in2 - x->x_in1);
  x->sign = ( x->x_in1 >= x->x_in2 ) ? 1 : -1;
  x->x_result = 1 / ((x->min / x->x_win) + 1);
  outlet_float(x->x_sign, x->sign);
  outlet_float(x->x_sim, x->x_result);
}
	
void simile_bang(t_simile *x) {
  outlet_float(x->x_sign, x->sign);
  outlet_float(x->x_sim, x->x_result);
}

t_class *simile_class;

void *simile_new(t_floatarg x_win) {
  t_simile *x = (t_simile *)pd_new(simile_class);
  x->x_sim = outlet_new(&x->x_obj, gensym("float"));
  x->x_sign = outlet_new(&x->x_obj, gensym("float"));
  floatinlet_new(&x->x_obj, &x->x_in2);
  floatinlet_new(&x->x_obj, &x->x_win);
  return (void *)x;
}

void simile_setup(void) {
  simile_class = class_new(gensym("simile"),
  (t_newmethod)simile_new,
  0, sizeof(t_simile),
  0, A_DEFFLOAT, 0);
  post("|------------->simile<--------------|");
  post("|->weighted similarity measurement<-|");
  post("|-->edward<----->kelly<----->2005<--|");

  class_addbang(simile_class, simile_bang);
  class_addfloat(simile_class, simile_float);
}