/*
 * Copyright (c) 2018-2020. 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.pgn.format.wrap;

import static org.hedgecode.chess.pgn.PGNConstants.*;

/**
 * AbstractWrapper
 *
 * @author Dmitry Samoshin aka gotty
 */
public abstract class AbstractWrapper implements MovesWrapper {

    protected abstract int length();

    @Override
    public String wrap(String moves) {
        StringBuilder sb = new StringBuilder();
        int startIndex = 0, endIndex = 0;
        moves = moves.concat(PGN_SPACE);
        int index = moves.indexOf(PGN_SPACE);
        while (index >= 0) {
            if (index - startIndex >= length()) {
                sb.append(
                        moves.substring(startIndex, endIndex)
                ).append(PGN_CRLF);
                startIndex = endIndex + 1;
            }
            endIndex = index;
            index = moves.indexOf(PGN_SPACE, index + 1);
        }
        sb.append(
                moves.substring(startIndex)
        ).append(PGN_CRLF);
        return sb.toString();
    }

}