/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * This program 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.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "pg_config.h"

IDENT("@(#) LOINC.cc (Gunther Schadow) 12/19/96");

#pragma implementation "LOINC.h"

#include "LOINC.h"
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <exception.h>
#include <iostream.h>
#include <ctype.h>
#include <ExternalCode.h>
#include <stdio.h> // for sprintf(3) only

static const char *loinc_db_base = "LOINC.db";
static char *loinc_db_file = NULL;

odbm::odbm_file Loinc::odbmf = odbm::null_dbf;
u_int Loinc::odbm_obj_cnt = 0;

Loinc::Loinc()
     : Code(),
       odbm(&loinc_num, &measure, &num_loinc, sizeof(num_loinc),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(loinc_db_file, loinc_db_base))
{
  index_on(&measure);
  index_on(&mclass);
  index_on(&source);
  index_on(&euclide_cd);
  index_on(&astm_cd);
  index_on(&iupac_cd);
  index_on(&metpath_code);
  num_loinc = 0;
}

Loinc::Loinc(int mode)
     : Code(),
       odbm(&loinc_num, &measure, &num_loinc, sizeof(num_loinc),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(loinc_db_file, loinc_db_base), mode)
{
  index_on(&measure);
  index_on(&mclass);
  index_on(&source);
  index_on(&euclide_cd);
  index_on(&astm_cd);
  index_on(&iupac_cd);
  index_on(&metpath_code);
}

Loinc::Loinc(const char *name)
     : Code(),
       odbm(&loinc_num, &measure, &num_loinc, sizeof(num_loinc),
	    &odbmf, &odbm_obj_cnt,
	    ExternalCode::new_dbf_path(loinc_db_file, loinc_db_base))
{
  index_on(&measure);
  index_on(&mclass);
  index_on(&source);
  index_on(&euclide_cd);
  index_on(&astm_cd);
  index_on(&iupac_cd);
  index_on(&metpath_code);
  set(name);
}

/*
 * Set the LOINC code to name is the loinc_num with check digit
 */
void
Loinc::set(const char *s)
{
  if(fetch(s) == FAIL)
    ERROR("loinc code `%s' not found", s);
  num_loinc = atoi(loinc_num);
  Code::set();
}

Loinc& Loinc::operator = (const char *s)
{
  free();
  set(s);  
  return *this;
}

// compute the LOINC check digit (FIX also in support/checkdigit)
int
Loinc::chkdg(int x)
{
  int odd = 0, even = 0, sum = 0;

  while(x != 0)
    {
      odd = odd * 10 + x % 10;
      x = x / 10;
      if(x == 0) break;
      even = even * 10 + x % 10;
      x = x / 10;
    }
  
  odd = odd * 2;
  
  while(odd != 0 || even != 0)
    {
      sum = sum + odd % 10 + even % 10;
      odd = odd / 10;
      even = even / 10;
    }

  return (10 - (sum % 10)) % 10;
}

Loinc& Loinc::operator = (int x)
{
  char buf[10];
  sprintf(&buf[0], "%d-%d", x, chkdg(x));
  free();
  set(buf);
  return *this;
}

bool Loinc::lookup(const char *s)
{
  if(fetch(s) == SUCCESS)
    return TRUE;
  else
    return FALSE;
}

bool Loinc::lookup(int x)
{
  char buf[10];
  sprintf(&buf[0], "%d-%d", x, chkdg(x));
  if(fetch(buf) == SUCCESS)
    return TRUE;
  else
    return FALSE;
}

inline bool
Loinc::lookup()
{
  u_int cursor = 0;

  if(odbm::fetch(&cursor) == SUCCESS)
    return TRUE;
  else
    return FALSE;
}

bool
Loinc::exists(int x) const
{
  char buf[10];
  sprintf(&buf[0], "%d-%d", x, chkdg(x));
  return odbm::exists(buf);
}