/*
 * Copyright (c) 2018. Developed by Hedgecode.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hedgecode.chess.uci.command;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.hedgecode.chess.position.Piece;
import org.hedgecode.chess.position.Square;
import org.hedgecode.chess.uci.UCICommand;
import org.hedgecode.chess.uci.UCIConstants;

/**
 * Abstract UCI command with parsing functionality.
 *
 * @author Dmitry Samoshin aka gotty
 */
public abstract class AbstractCommand implements UCICommand {

    private static final String NULLMOVE = UCIConstants.NULLMOVE;

    private static final Pattern MOVE_PATTERN = Pattern.compile(UCIConstants.MOVE_REGEX);

    private static final int SQUARE_FROM = UCIConstants.MOVE_REGEX_FROM;
    private static final int SQUARE_TO = UCIConstants.MOVE_REGEX_TO;
    private static final int PIECE_PROMOTE = UCIConstants.MOVE_REGEX_PROMOTE;


    protected Move parseMove(String move) {
        if (NULLMOVE.equals(move))
            return new Move(null, null);

        Matcher matcher = MOVE_PATTERN.matcher(move);
        if (matcher.find()) {
            return new Move(
                    Square.getSquare(matcher.group(SQUARE_FROM)),
                    Square.getSquare(matcher.group(SQUARE_TO)),
                    Piece.byLetter(matcher.group(PIECE_PROMOTE))
            );
        }
        return null;
    }

}