package org.myrobotlab.chess;

//
//  Move.java
//
//  Created by Peter Hunter on Mon Dec 31 2001.
//  Copyright (c) 2001 Peter Hunter. All rights reserved.
//
public final class HMove extends org.op.chess.Move implements Comparable<HMove>, Constants {
  public final int promote;
  public final int bits;
  final char pieceLetter;
  int score = 0;

  public HMove(int from, int to, int promote, int bits, char pieceLetter) {
    super(from, to);
    this.promote = promote;
    this.bits = bits;
    this.pieceLetter = pieceLetter;
  }

  /**
   * Compares this move to another move. The implementation is strictly
   * defective - it ought to do something other than throw a ClassCastException
   * if o is not a Move, but for optimization reasons it doesn't. This class is
   * only partially ordered. That is, the ordering is incompatible with equals.
   */

  @Override
  public int compareTo(HMove m) {
    int mScore = m.getScore();
    return mScore - score; // Can't overflow so this should work.
  }

  @Override
  public boolean equals(Object o) {
    HMove m = (HMove) o;
    return (m.from == from && m.to == to && m.promote == promote);
  }

  int getScore() {
    return score;
  }

  @Override
  public int hashCode() {
    return from + (to << 8) + (promote << 16);
  }

  void setScore(int i) {
    score = i;
  }

  @Override
  public String toString() {
    char c;
    StringBuffer sb = new StringBuffer();

    if ((bits & 32) != 0) {
      switch (promote) {
        case KNIGHT:
          c = 'n';
          break;
        case BISHOP:
          c = 'b';
          break;
        case ROOK:
          c = 'r';
          break;
        default:
          c = 'q';
          break;
      }
      sb.append((char) (getFromCol() + 'a'));
      sb.append(8 - getFromRow());
      sb.append("-");
      sb.append((char) (getToCol() + 'a'));
      sb.append(8 - getToRow());
      sb.append(c);
    } else {
      if (pieceLetter != 'P')
        sb.append(pieceLetter);
      sb.append((char) (getFromCol() + 'a'));
      sb.append(8 - getFromRow());
      sb.append("-");
      sb.append((char) (getToCol() + 'a'));
      sb.append(8 - getToRow());
    }
    return sb.toString();
  }
}