/*******************************************************************************
*
* McStas, neutron ray-tracing package
*         Copyright 1997-2002, All rights reserved
*         Risoe National Laboratory, Roskilde, Denmark
*         Institut Laue Langevin, Grenoble, France
*
* Component: Scatter_logger.comp
*
* %I
*
* Written by: Erik B Knudsen, Peter K Willendrup & Esben Klinkby
* Date: January 2013
* Version: $Revision: 1.12 $
* Release: McStas 2.1
* Origin: DTU Physics / DTU Nutech
*
* Logging iteractions of neutrons with components
*
* %D
* Start of the trace-region in which SCATTER events should be logged.
* Whenever a SCATTER occurs in components between this one and its counterpart Scatter_logger_stop the neutron state is logged.
* The log is kept in memory - but only for one single
* numerical neutron at a time, so there should be no real danger of memory overrun.
*
* %P
* Input parameters:
*
* %E
*******************************************************************************/

DEFINE COMPONENT Scatter_logger

SETTING PARAMETERS ()


SHARE
  %{
  struct Generalized_State_t {
    double _x,_y,_z,_vx,_vy,_vz;
    double _p,_t,_sx,_sy,_sz;
    long long int _nid;
    int _comp, _idx;
  };

#define SCATTER_LOG(Size,Store,index,overrun) do { \
    if (index<Size-1){\
      struct Generalized_State_t *bp=&(Store[index]);\
      if( (bp-1)->_p!=p || (bp-1)->_vx!=vx || (bp-1)->_vy!=vy || (bp-1)->_vz!=vz ){\
        Coords ctmp=POS_A_CURRENT_COMP;\
        Coords _r = coords_set(x,y,z);\
        Coords _v = coords_set(vx,vy,vz);\
        Coords _s = coords_set(sx,sy,sz);\
        Coords _rg,_vg,_sg;\
        Rotation _Rt;\
        rot_transpose(ROT_A_CURRENT_COMP,_Rt);\
        _rg=coords_add(rot_apply(_Rt,_r),ctmp);\
        _vg=rot_apply(_Rt,_v);\
        _sg=rot_apply(_Rt,_s);\
        coords_get(_rg,&(bp->_x),&(bp->_y),&(bp->_z));\
        coords_get(_vg,&(bp->_vx),&(bp->_vy),&(bp->_vz));\
        coords_get(_sg,&(bp->_sx),&(bp->_sy),&(bp->_sz));\
        bp->_t=t;\
        bp->_p=p;\
        bp->_nid=mcget_run_num();\
        bp->_comp=INDEX_CURRENT_COMP;\
        bp->_idx=index;\
        index++;\
      }\
    }else if(index==(Size-1) && !overrun){\
      printf("Warning (%s): Scatter_log overrun at %llu - not logging any more events\n",NAME_CURRENT_COMP,mcget_run_num());\
      overrun=1;\
    }\
    do {mcDEBUG_SCATTER(x, y, z, vx, vy, vz, \
			t,sx,sy,sz, p); SCATTERED++;} while(0);\
} while(0)

#define SCATTER0\
    do {mcDEBUG_SCATTER(x, y, z, vx, vy, vz, \
			t,sx,sy,sz, p); SCATTERED++;} while(0)

  const int BOUNCE_LOG_SIZE=1000000;
  struct Generalized_State_t *Bounce_store;

%}

DECLARE
%{
  int bounce_store_index;
  int bounce_store_overrun;
%}

INITIALIZE
%{
  bounce_store_index=0;
  if ( (Bounce_store=malloc(sizeof(*Bounce_store)*BOUNCE_LOG_SIZE))==NULL){
    fprintf(stderr,"Error: Scatter_logger: Cannot allocate memory for %d Generalized_State_ts of size %d bytes\n",BOUNCE_LOG_SIZE,sizeof(*Bounce_store));
    exit(-1);
  }
  Bounce_store[BOUNCE_LOG_SIZE-1]._p=-1;
%}


TRACE
%{
#undef SCATTER
#define SCATTER SCATTER_LOG(BOUNCE_LOG_SIZE, Bounce_store, bounce_store_index,bounce_store_overrun)

#undef mcabsorb
#define mcabsorb scatter_logger_stop
  bounce_store_index=0;/*we are now starting logging so we should start afresh*/
  if (bounce_store_index<BOUNCE_LOG_SIZE){
    struct Generalized_State_t *bp=&(Bounce_store[bounce_store_index]);
    Coords ctmp=POS_A_CURRENT_COMP;
    Coords r = coords_set(x,y,z);
    Coords v = coords_set(vx,vy,vz);
    Coords s = coords_set(sx,sy,sz);

    Coords rg,vg,sg;

    Rotation Rt;
    rot_transpose(ROT_A_CURRENT_COMP,Rt);
    rg=coords_add(rot_apply(Rt,r),ctmp);
    vg=rot_apply(Rt,v);
    sg=rot_apply(Rt,s);
    coords_get(rg,&(bp->_x),&(bp->_y),&(bp->_z));
    coords_get(vg,&(bp->_vx),&(bp->_vy),&(bp->_vz));
    coords_get(sg,&(bp->_sx),&(bp->_sy),&(bp->_sz));
    bp->_t=t;
    bp->_p=p;
    bp->_nid=mcget_run_num();
    bp->_comp=INDEX_CURRENT_COMP;
    bp->_idx=bounce_store_index;
    bounce_store_index++;
  }else if(bounce_store_index==BOUNCE_LOG_SIZE && !bounce_store_overrun){
    printf("Warning (%s): Scatter_log overrun - not logging any more SCATTER events\n",NAME_CURRENT_COMP);
    bounce_store_overrun=1;
  }
%}

FINALLY
%{
%}

END
