/*
 * Pawn.java
 *
 * Created on February 10, 2007, 6:42 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package chess;

/**
 *
 * @author Stanislav Hromek
 */
public class Pawn extends Piece {
    private static final String name = "pawn";
        
    /** Creates a new instance of Pawn */
    public Pawn(String pieceColor) {
        this.pieceColor = pieceColor;
    }
    
    boolean isRoadOk(Board board,  String movePieceFrom, String movePieceTo) {
        // get squares between (vertical)
        if(board.isVertical(movePieceFrom, movePieceTo)){
            Square[] squares = board.getSquaresVertical(movePieceFrom, movePieceTo);
            for (int i = 0; i < squares.length; i++) {
                if(squares[i].getPiece() != null)
                    return false;
            }
        } else
            assert false;
        
        return true;
    }
    
    /**
     * this is little bit complicated
     * pawn can move:
     * forwards one square
     * forwards two squares if in starting position
     * can take opposite piece to the sides
     * can take opposite pawn if it moved two squares on the middle square
     */
    boolean possibleToMoveToEndSquare(Board board, String movePieceFrom, String movePieceTo) {
        // test starting square gave, that on movePieceFrom is pawn (we can get his color)
        String color = board.getSquare(movePieceFrom).getPiece().getPieceColor();
        if(board.isOneForward(color, movePieceFrom, movePieceTo)){
            // if ending square is empty
            if(board.getSquare(movePieceTo).isEmpty()){
                return true;
            }
        } else if(board.isTwoForward(color, movePieceFrom, movePieceTo)){
            // road to ending square is tested in isRoadOk
            if(board.getSquare(movePieceTo).isEmpty()){
                return true;
            }
        } else if(board.isExchange(color, movePieceFrom, movePieceTo)){
            if( board.getSquare(movePieceTo).isEmpty() ){
                return false;
            } else{
                if(board.getSquare(movePieceTo).getPiece().isOppositeColor(color)){
                    return true;
                }
            }
        } else if(board.isExchange2(color, movePieceFrom, movePieceTo)){
            return true;
        }
        
        return false;
    }

    public String getName() {
        return name;
    }
    
}