/*
 *  iemmatrix
 *
 *  objects for manipulating simple matrices
 *  mostly refering to matlab/octave matrix functions
 *
 * Copyright (c) 2005, Franz Zotter
 * IEM, Graz, Austria
 *
 * For information on usage and redistribution, and for a DISCLAIMER OF ALL
 * WARRANTIES, see the file, "LICENSE.txt," in this distribution.
 *
 */

#include "iemmatrix.h"

static t_class *mtx_decay_class;

typedef struct _MTXDecay_ MTXDecay;
struct _MTXDecay_
{
   t_object x_obj;
   int rows;
   int columns;
   int size;
   int decay_dimension;
   int decay_direction;
   t_float decay_parameter;

   t_outlet *list_outlet;

   t_atom *list_out;
   t_atom *list_in;
   t_float *x;
   t_float *y;
};

static void deleteMTXDecay (MTXDecay *mtx_decay_obj) 
{
   if (mtx_decay_obj->list_out)
      freebytes (mtx_decay_obj->list_out, sizeof(t_atom)*(mtx_decay_obj->size+2));
   if (mtx_decay_obj->x)
      freebytes (mtx_decay_obj->x, sizeof(t_float)*(mtx_decay_obj->size));
   if (mtx_decay_obj->y)
      freebytes (mtx_decay_obj->y, sizeof(t_float)*(mtx_decay_obj->size));
}

static void mTXSetDecayParameter (MTXDecay *mtx_decay_obj, t_float d_param)
{
   d_param = (d_param > 0.0f)?d_param:0.0f;
   d_param = (d_param < 1.0f)?d_param:1.0f;
   mtx_decay_obj->decay_parameter = d_param;
}
static void mTXSetDecayDirection (MTXDecay *mtx_decay_obj, t_float c_dir)
{
   int direction = (int) c_dir;
   mtx_decay_obj->decay_direction = (direction==-1)?direction:1;
}
static void mTXSetDecayDimension (MTXDecay *mtx_decay_obj, t_float c_dim)
{
   int dimension = (int) c_dim;
   mtx_decay_obj->decay_dimension = (dimension==2)?dimension:1;
}

static void *newMTXDecay (t_symbol *s, int argc, t_atom *argv)
{
   MTXDecay *mtx_decay_obj = (MTXDecay *) pd_new (mtx_decay_class);
   int c_dir = 1;
   int c_dim = 1;
   t_float c_par = 0.9f;

   mtx_decay_obj->decay_dimension = c_dim;
   switch ((argc>3)?3:argc) {
      case 3:
	 c_dir = atom_getint(argv+2);
      case 2:
	 c_dim = atom_getint(argv+1);
      case 1:
	 c_par = atom_getfloat(argv);
   }
   mTXSetDecayParameter (mtx_decay_obj, c_par);
   mTXSetDecayDirection (mtx_decay_obj, (t_float) c_dir);
   mTXSetDecayDimension (mtx_decay_obj, (t_float) c_dim);

   mtx_decay_obj->list_outlet = outlet_new (&mtx_decay_obj->x_obj, gensym("matrix"));
   return ((void *) mtx_decay_obj);
} 

static void mTXDecayBang (MTXDecay *mtx_decay_obj)
{
   if (mtx_decay_obj->list_out) 
      outlet_anything(mtx_decay_obj->list_outlet, gensym("matrix"), 
	    mtx_decay_obj->size+2, mtx_decay_obj->list_out);
}

static void writeFloatIntoList (int n, t_atom *l, t_float *f) 
{
   for (;n--;f++, l++) 
      SETFLOAT (l, *f);
}
static void readFloatFromList (int n, t_atom *l, t_float *f) 
{
   while (n--) 
      *f++ = atom_getfloat (l++);
}
static void readFloatFromListModulo (int n, int m, t_atom *l, t_float *f) 
{
   t_atom *ptr = l;
   int count1, count2;
   n /= m;
   count1 = m;
   while (count1--) 
      for (count2 = n, ptr = l++; count2--; ptr += m, f++) 
	 *f = atom_getfloat (ptr);
}
static void writeFloatIntoListModulo (int n, int m, t_atom *l, t_float *f) 
{
   t_atom *ptr = l;
   int count1, count2;
   n /= m;
   count1 = m;
   while (count1--) 
      for (count2 = n, ptr = l++; count2--; ptr += m, f++) 
	 SETFLOAT(ptr,*f);
}

static void deCay (int n, t_float *x, t_float *y, t_float alpha)
{
   t_float decay = *x;
   t_float oneminusalpha = 1.0f-alpha;
   for (;n--; x++, y++) {
      decay = alpha * decay + oneminusalpha * *x;
      *y = decay = (decay < *x)? *x : decay;
   }
}
static void deCayReverse (int n, t_float *x, t_float *y, t_float alpha)
{
   t_float decay = *x;
   t_float oneminusalpha = 1.0f-alpha;
   for (;n--; x--, y--) {
      decay = alpha * decay + oneminusalpha * *x;
      *y = decay = (decay < *x)? *x : decay;
   }
}

static void mTXDecayMatrix (MTXDecay *mtx_decay_obj, t_symbol *s, 
      int argc, t_atom *argv)
{
   int rows = atom_getint (argv++);
   int columns = atom_getint (argv++);
   int size = rows * columns;
   int list_size = argc - 2;
   t_atom *list_ptr = argv;
   t_atom *list_out = mtx_decay_obj->list_out;
   t_float *x = mtx_decay_obj->x;
   t_float *y = mtx_decay_obj->y;
   int count;

   // size check
   if (!size) {
      post("mtx_decay: invalid dimensions");
      return;
   }
   else if (list_size<size) {
      post("mtx_decay: sparse matrix not yet supported: use \"mtx_check\"");
      return;
   }
   else if ((!x)||(!list_out)||(!y)) {
      if (!x)
	 x = (t_float *) getbytes (sizeof (t_float) * (size));
      if (!y)
	 y = (t_float *) getbytes (sizeof (t_float) * (size));
      if (!list_out)
	 list_out = (t_atom *) getbytes (sizeof (t_atom) * (size+2));
   }
   else if (size != mtx_decay_obj->size) {
      x = (t_float *) resizebytes (x,
	    sizeof (t_float) * (mtx_decay_obj->size),
	    sizeof (t_float) * (size));
      y = (t_float *) resizebytes (y,
	    sizeof (t_float) * (mtx_decay_obj->size),
	    sizeof (t_float) * (size));
      list_out = (t_atom *) resizebytes (list_out,
	    sizeof (t_atom) * (mtx_decay_obj->size+2),
	    sizeof (t_atom) * (size + 2));
   }
   mtx_decay_obj->size = size;
   mtx_decay_obj->rows = rows;
   mtx_decay_obj->columns = columns;
   mtx_decay_obj->list_out = list_out;
   mtx_decay_obj->x = x;
   mtx_decay_obj->y = y;

   // main part
   // reading matrix from inlet
   if (mtx_decay_obj->decay_dimension == 2) {
      readFloatFromListModulo (size, columns, list_ptr, x);
      columns = mtx_decay_obj->rows;
      rows = mtx_decay_obj->columns;
   }
   else
      readFloatFromList (size, list_ptr, x);
   
   // calculating decay
   if (mtx_decay_obj->decay_direction == -1) {
      x += columns-1;
      y += columns-1;
      for (count = rows; count--; x += columns, y += columns)
	 deCayReverse (columns,x,y,mtx_decay_obj->decay_parameter);
   }
   else
      for (count = rows; count--; x += columns, y += columns)
	 deCay (columns,x,y,mtx_decay_obj->decay_parameter);
   x = mtx_decay_obj->x;
   y = mtx_decay_obj->y;

   // writing matrix to outlet
   if (mtx_decay_obj->decay_dimension == 2) {
      columns = mtx_decay_obj->columns;
      rows = mtx_decay_obj->rows;
      writeFloatIntoListModulo (size, columns, list_out+2, y);
   }
   else
      writeFloatIntoList (size, list_out+2, y);

   SETSYMBOL(list_out, gensym("matrix"));
   SETFLOAT(list_out, rows);
   SETFLOAT(&list_out[1], columns);
   outlet_anything(mtx_decay_obj->list_outlet, gensym("matrix"), 
	 mtx_decay_obj->size+2, list_out);
}

void mtx_decay_setup (void)
{
   mtx_decay_class = class_new 
      (gensym("mtx_decay"),
       (t_newmethod) newMTXDecay,
       (t_method) deleteMTXDecay,
       sizeof (MTXDecay),
       CLASS_DEFAULT, A_GIMME, 0);
   class_addbang (mtx_decay_class, (t_method) mTXDecayBang);
   class_addmethod (mtx_decay_class, (t_method) mTXDecayMatrix, gensym("matrix"), A_GIMME,0);
   class_addmethod (mtx_decay_class, (t_method) mTXSetDecayParameter, gensym("alpha"), A_DEFFLOAT,0);
   class_addmethod (mtx_decay_class, (t_method) mTXSetDecayDimension, gensym("dimension"), A_DEFFLOAT,0);
   class_addmethod (mtx_decay_class, (t_method) mTXSetDecayDirection, gensym("direction"), A_DEFFLOAT,0);
   class_sethelpsymbol (mtx_decay_class, gensym("iemmatrix/mtx_decay"));
}

void iemtx_decay_setup(void){
  mtx_decay_setup();
}