/* The LearningOnline Network with CAPA 
 * CAPA wrapper code
 * $Id: caparesponse.c,v 1.20 2005/12/20 19:59:52 albertel Exp $
 *
 * Copyright Michigan State University Board of Trustees
 *
 * This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 *
 * LON-CAPA 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 2 of the License, or
 * (at your option) any later version.
 *
 * LON-CAPA 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 LON-CAPA; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * /home/httpd/html/adm/gpl.txt
 *
 * http://www.lon-capa.org/
 */

#include <capaCommon.h>
#include <ranlib.h>

PointsList_t * parse_pts_list (char *pts_list) {
  PointsList_t *new=NULL, *end=NULL, *beforeend=NULL, *rlist=NULL;
  char *idx_pts=pts_list;
  int done=0;
  /*fprintf(stderr,"ids %s\n",id_list);
    fprintf(stderr,"pts %s\n",pts_list);*/
  while (!done && pts_list) {
    int idx;
    /*fprintf(stderr,"pts; %s\n",idx_pts);*/
    new=gen_ptslist_str(idx_pts);
    if (!new) break;
    if (!rlist) { rlist=new; }
    if (end) { 
      end->pts_next=new; 
      idx=end->pts_idx;
    } else {
      idx=-1;
    }
    end=new;
    while (end) {
      idx++;
      end->pts_idx=idx;
      /*fprintf(stderr,"end is:%d:%d:%s:%d\n",idx,end->pts_idx,end->pts_str,
	end->pts_next);*/
      beforeend=end;
      end=end->pts_next;
    }
    end=beforeend;
    idx_pts=strchr(idx_pts,';');
    if (idx_pts) { idx_pts++; } else { done=1; }
  }
  
  return rlist;
}

int caparesponse_capa_check_answer(char *response,char *correct,
				   int type,int tol_type,double tolerance,
				   int sig_lbound,int sig_ubound, 
				   char *ans_fmt, char *unit_str,
				   int calc, char *id_list, char *pts_list, 
				   char *rndseed, char** reterror)
				   
{
  long result,seed1,seed2;
  Problem_t p;
  char *error=NULL,filename[FILE_NAME_LENGTH];
  FILE *fp;

  /* need to initialize unit parser*/
  *reterror=NULL;
  sprintf(filename,"/home/httpd/html/res/adm/includes/capa.units");
  if ((fp=fopen(filename,"r"))==NULL) {
    /* printf("Error: can't open %s\n",filename);*/
      return (-1); 
  }
  u_getunit(fp);
  fclose(fp);
  /* need to setup random generator (FIXME) should only do this if 
     it hasn't been yet*/
  phrtsd(rndseed,&seed1,&seed2);
  setall(seed1,seed2);

  /* assign_id_list and assign_pts_list exist in capaGrammerDef.y */
  p.id_list=NULL;
  p.pts_list=NULL;

  if (type == ANSWER_IS_FORMULA) {
    p.id_list=id_list;
    p.pts_list=parse_pts_list(pts_list);
//  if ( p.id_list == NULL || p.pts_list == NULL) {
//    return BAD_FORMULA;
//  }
  }
  p.ans_type   = type;
  p.answer     = correct;
  p.tol_type   = tol_type;
  p.tolerance  = tolerance;
  p.sig_lbound = sig_lbound;
  p.sig_ubound = sig_ubound;
  
  if (ans_fmt != NULL ) {
    strncpy(p.ans_fmt,ans_fmt,ANSWER_STRING_LENG-1);
  }
  if (unit_str != NULL && unit_str[0]!='\0') {
    strncpy(p.unit_str,unit_str,ANSWER_STRING_LENG-1);
    //p.ans_unit = u_parse_unit(unit_str);
    p.ans_unit   = parse_unit_expr(unit_str);
    p.ans_unit   = process_utree(p.ans_unit);
    //print_unit_t(p.ans_unit);
  } else {
    p.unit_str[0]='\0';
    p.ans_unit=NULL;
  }
  p.calc       = calc;

  result=capa_check_answer(&p,response,&error);
  *reterror=error;
  // Caller is expected to free reterror
  //  if (error!=NULL) {free(error);}

  return result;
}

int caparesponse_get_real_response (char* unit_str, char* answer,
				    double* scaled) {
  //double caparesponse_get_real_response (char* unit_str, char* answer) {
  int     input_len,all_alphabet,idx,outcome=-1,result;
  double  n_part,scale=1.0,given,target;
  char    input[ANSWER_STRING_LENG],filename[FILE_NAME_LENGTH],
    tmp_unit_str[ANSWER_STRING_LENG];
  Unit_t *ans_unit;
  long    seed1,seed2;
  FILE   *fp;
  sprintf(filename,"/home/httpd/html/res/adm/includes/capa.units");
  if ((fp=fopen(filename,"r"))==NULL) {
    /* printf("Error: can't open %s\n",filename);*/
    return (-1); 
  }
  u_getunit(fp);
  fclose(fp);

  if (unit_str != NULL && unit_str[0]!='\0') {
    ans_unit   = parse_unit_expr(unit_str);
    ans_unit   = process_utree(ans_unit);
  } else {
    ans_unit=NULL;
  }
  input_len = strlen(answer);
  all_alphabet = 1;
  for(idx=0;idx<input_len;idx++) {
    if( isdigit(answer[idx]) ) {
      all_alphabet = 0;
    }
  }
  if( !all_alphabet ) {
    tmp_unit_str[0] = 0;
    outcome = split_num_unit(answer,&n_part,input,tmp_unit_str);
  }
  if( outcome > 0 ) {
    if( outcome > 1 ) { /* with both num and unit parts or only unit part */
      if( ans_unit != NULL ) {
	result = check_correct_unit(tmp_unit_str,ans_unit,&scale);
      } else {
	/* what to do when no unit is specified but student entered a unit? */
	result = UNIT_NOTNEEDED;
      }
    } else {
      if( ans_unit != NULL ) {
	result = NO_UNIT;
      }
    }
    if( (result != NO_UNIT) && (!check_for_unit_fail(result)) && ( result != UNIT_NOTNEEDED) ) {
      given = n_part * scale;
      *scaled=given;
      /* convert the given answer into proper scale for units */
    } /* end if unit check */
  } else { /* user entered a
lphabet, but no number */
    result = WANTED_NUMERIC;
  } 
  return result;
}

/* Testing harnass
int main(void) {
  int result=0;
  char *reterror=NULL;
  result= caparesponse_capa_check_answer("10^3","1000",
					 ANSWER_IS_FORMULA,
					 TOL_ABSOLUTE,1E-3,
					 3,5,NULL,NULL,
					 CALC_UNFORMATED,
					 "","4",
					 "rndseed",
					 &reterror);
  fprintf(stderr,"result %d\nreterror: %s\n",result,reterror);
}
*/