/*
    Sjeng - a chess variants playing program
    Copyright (C) 2000 Gian-Carlo Pascutto

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    File: learn.c                                        
    Purpose: remembering of positions

*/

#include "sjeng.h"
#include "protos.h"
#include "extvars.h"

typedef struct 
{
  signed Depth:7;
  unsigned OnMove:1;  
  unsigned char Bestmove;
  unsigned long Hash;
  unsigned long Hold_hash;
  signed long Bound;
}
LearnType;

void Learn(int score, int best, int depth)
{
  int number = 0, next = 0;
  LearnType draft;
  FILE **lrnfile;

  printf("Learning score: %d  best: %d  depth:%d  hash: %X\n", score, best, depth, hash);
  
  if (Variant == Normal)
    {
      lrnfile = &lrn_standard;
    }
  else if ((Variant == Crazyhouse) || (Variant == Bughouse))
    {
      lrnfile = &lrn_zh;
    }
  else if (Variant == Suicide)
  {
      lrnfile = &lrn_suicide;
  }
  else if (Variant == Losers)
  {
      lrnfile = &lrn_losers;
  }
  else
    return;

  fseek(*lrnfile, 0, SEEK_SET);
  fread(&number, sizeof(int), 1, *lrnfile);
  fread(&next, sizeof(int), 1, *lrnfile);
  
  if (number < 50000) number++;
  
  fseek(*lrnfile, 0, SEEK_SET);
  fwrite(&number, sizeof(int), 1, *lrnfile);
  
  next++;
  if (next == 50000) next = 1;
  
  fwrite(&next, sizeof(int), 1, *lrnfile);
  
  fseek(*lrnfile, (2*sizeof(int)) + ((next-1)*sizeof(LearnType)), SEEK_SET);
  
  draft.Depth = depth;
  draft.OnMove = ToMove;
  draft.Hash = hash;
  draft.Hold_hash = hold_hash;
  draft.Bound = score;
  draft.Bestmove = best;
  
  fwrite(&draft, sizeof(draft), 1, *lrnfile);
  
  fflush(*lrnfile);
}

void LoadLearn(void)
{
  int number = 0, posloop;
  LearnType draft;
  FILE **lrnfile;
    
  if (((Variant == Crazyhouse) || (Variant == Bughouse)) && (!lrn_zh))
    return;
  else if ((Variant == Normal) && !lrn_standard)
    return;
  else if (Variant == Suicide && !lrn_suicide)
    return;
  else if (Variant == Losers && !lrn_losers)
    return;
  
  if (Variant == Normal)
    {
      lrnfile = &lrn_standard;
    }
  else if ((Variant == Crazyhouse) || (Variant == Bughouse))
    {
      lrnfile = &lrn_zh;
    }
  else if (Variant == Suicide)
    {
      lrnfile = &lrn_suicide;
    }
  else if (Variant == Losers)
  {
      lrnfile = &lrn_losers;
  }

  fseek(*lrnfile, 0, SEEK_SET);
  fread(&number, sizeof(int), 1, *lrnfile);
  fseek(*lrnfile, 2*sizeof(int), SEEK_SET);

  for (posloop = 0; posloop < number; posloop++)
    {
      fread(&draft, sizeof(LearnType), 1, *lrnfile);
      LearnStoreTT(draft.Bound, draft.Hash, draft.Hold_hash, 
		   draft.OnMove, draft.Bestmove, draft.Depth);	  
    }

  return;
}