import java.util.*;

/**
  Class containing Hash Table for a particular game.
 */
public class HashTable {
  public static final int NONULL = 04;
  public static final int EXACT = 03;
  public static final int UPPER = 02;
  public static final int LOWER = 01;
  public static final int WORTHLESS = 00;


  private long[] word1;
  private long[] word2;
  private long[] worda1;
  private long[] worda2;
  private int    old=0,old1=0,age=0;
  private int    hits, stores, probes, collisions,hash_size;
  
  private long[][] hashval = new long[12][64];

  public HashTable(int sz)
  {
     RandomX r = new RandomX();
     int i,j;

     if (sz > 0) {
       word1 = new long[sz];
       word2 = new long[sz];
       worda1 = new long[sz*2];
       worda2 = new long[sz*2];
     }
     hash_size = sz;

     for(i=0; i < 12; ++i)
       for(j=0; j < 64; ++j)
          hashval[i][j] = r.nextLong();

     StatReset();
        
  }

  /*
     age    3   07
     depth  7   0177
     type   2   03
     val   21   07777777
     pvc   23   037777777
  */

  public int[] probe(long hkey, int ply, int depth, int side, 
                     int alpha, int beta, int random)
  {
      long w1;
      long w2;
      int key;
      int[] ret = new int[4];
      boolean found = false;

      ret[0] = alpha;
      ret[1] = beta;
      ret[2] = WORTHLESS;
      ret[3] = 0;

      if (hash_size == 0) return ret;

      probes++;
      
      w2 = (side==1?hkey:~hkey);
      key = (int) (w2 & (hash_size-1));
      w1 = word1[key];
      if (w2 == word2[key])
        ret[3] = (int) (w1>>33 & 037777777);
      int d = (int) (w1>>3 & 0177);
      if (depth <= d && w2 == word2[key]){
        found = true;
        w1 = (w1&(~07L)) | ((long) (age&07));
        word1[key] = w1;
      } else {
        key = (int) (w2 & (hash_size*2-1));
        w1 = worda1[key];
        if (w2 == worda2[key])
          ret[3] = (int) (w1>>33 & 037777777);
        d = (int) (w1>>3 & 0177);
        if (depth <= d && w2 == worda2[key]) {
          found = true;
          w1 = (w1&(~07L)) | ((long) (age&07));
          worda1[key] = w1;
        }
      }

      if (found) {
        int val  = (int) (w1>>12 & 07777777)-Board.WIN_SCORE;
        int type = (int) (w1>>10 & 03);

        hits++;

        switch (type) {
          case EXACT:
            if (val > Board.WIN_SCORE-100) val-=(ply-1);
            else if (val < -Board.WIN_SCORE+100) val+=(ply-1);
            else val += random*side;
            ret[0]=val;           
            ret[2]=EXACT;
            break;
          case UPPER:
            val += random*side;
            if (val <= alpha) {
              ret[0]=val;
              ret[2]=UPPER;
            } else
              ret[2]=NONULL;
            break;
          case LOWER:
            val += random*side;
            if (val >= beta) {
              ret[1]=val;
              ret[2]=LOWER;
            } else
              ret[2]=NONULL;
            break;
        }

      }

      return ret;
  }


  public void store(long hkey, int pvc, int ply, int depth, 
                    int side, int type, int val, int random)
  {
      if (hash_size == 0) return;

      long w1,w2 = (side==1?hkey:~hkey);
      int key = (int) (w2 & (hash_size-1));
      w1 = word1[key];

      if (depth < 0) depth=0;
      int a = (int) (w1 & 07);
      int d = (int) (w1>>3&0177);  

      if (type == EXACT) {
        if (val > Board.WIN_SCORE-100) val=val+ply-1;
        else if (val < -Board.WIN_SCORE+100) val=val-ply+1;
        else val -= random*side;
      } else val -= random*side;
      w1 = pvc&037777777;
      w1 = (w1<<21) | ((long) (val+Board.WIN_SCORE)& 07777777);
      w1 = (w1<<2) | ((long) (type&03));
      w1 = (w1<<7) | ((long) (depth&0177));
      w1 = (w1<<3) | ((long) (age&07));
      stores++;

      if (expired(a) || depth >= d) {
         if (word2[key] != w2 && word2[key] != 0) {
           int k = (int) (word2[key] & (hash_size*2-1));
           worda1[k] = word1[key];
           worda2[k] = word2[key];
         }
         if (word2[key] != 0 && word2[key] != w2 && age == a)
            collisions++;
         word1[key] = w1;
         word2[key] = w2;
      } else {
        key = (int) (w2 & (hash_size*2-1));
        if (worda2[key] != 0 && worda2[key] != w2 && age == (int)(worda1[key] & 07))
            collisions++;
         worda1[key] = w1;
         worda2[key] = w2;
      }
  }

  public boolean expired(int a)
  {
    // (a != age && a != old && a != old1)
    return (a != age);
  }
  public void aged()
  {
     old1 = old;
     old  = age;
     age = (age+1)& 07;
  }

  public long hashVal(long hkey, int piece, int row, int col)
  {
    int i = (piece<0?piece+6:piece+5);
    int j = row<<3|col;
    if (piece == 0) return hkey;
    return hashval[i][j]^hkey;
  }

  public long hashVal(Board b)
  {
    long hkey=0;
    int i,j;
    for (i=0; i < 8; ++i)
      for (j=0; j < 8; ++j)
         hkey = hashVal(hkey, b.Space(i,j), i, j);

    return hkey;
  }

  public void StatReset()
  {
    hits=0;
    stores=0;
    probes=0;
    collisions=0;
  }

  public String StatString()
  {
     if (hash_size == 0) return  "";
     return " hs=" + stores + 
            " hp=" + probes + 
            " hh=" + hits +
            " " + 100*hits/(probes+1) + "% " +
            " hc=" + collisions + 
            " " + 100*collisions/(stores+1) + "% "
            ;   
  }


  public boolean isSet()
  {
     return (hash_size > 0);
  }
}
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