/*
 *
 * Copyright (c) 2013 - 2017 Lijun Liao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 *
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the XiPKI software without
 * disclosing the source code of your own applications.
 *
 * For more information, please contact Lijun Liao at this
 * address: lijun.liao@gmail.com
 */

package org.xipki.commons.console.karaf.completer;

import java.io.File;
import java.util.List;

import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.support.completers.FileCompleter;

/**
 * @author Lijun Liao
 * @since 2.0.0
 */

@Service
public class DirPathCompleter extends FileCompleter {

    /* Comment in for karaf 4.1.*
    @Override
    protected boolean accept(Path path) {
        return path.toFile().isDirectory() && super.accept(path);
    }
    */

    // This method is for karaf 4.0.*
    @Override
    protected int matchFiles(final String buffer, final String translated, final File[] files,
            final List<String> candidates) {
        if (files == null) {
            return -1;
        }

        int matches = 0;

        // first pass: just count the matches
        for (File file : files) {
            if (file.isDirectory() && file.getAbsolutePath().startsWith(translated)) {
                matches++;
            }
        }
        for (File file : files) {
            if (file.isDirectory() && file.getAbsolutePath().startsWith(translated)) {
                CharSequence name =
                        file.getName() + (matches == 1 && file.isDirectory() ? separator() : " ");
                candidates.add(render(file, name).toString());
            }
        }

        final int index = buffer.lastIndexOf(separator());

        return index + separator().length();
    }

}