/*
 * Copyright (C) 2008, Jonas Fonseca <fonseca@diku.dk>
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.pgm;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.filter.RevFilter;
import org.kohsuke.args4j.Argument;
import org.kohsuke.args4j.Option;

@Command(usage = "usage_MergeBase")
class MergeBase extends TextBuiltin {
	@Option(name = "--all", usage = "usage_displayAllPossibleMergeBases")
	private boolean all;

	@Argument(index = 0, metaVar = "metaVar_commitish", required = true)
	void commit_0(final RevCommit c) {
		commits.add(c);
	}

	@Argument(index = 1, metaVar = "metaVar_commitish", required = true)
	private List<RevCommit> commits = new ArrayList<>();

	/** {@inheritDoc} */
	@Override
	protected void run() {
		try {
			for (RevCommit c : commits) {
				argWalk.markStart(c);
			}
			argWalk.setRevFilter(RevFilter.MERGE_BASE);
			int max = all ? Integer.MAX_VALUE : 1;
			while (max-- > 0) {
				final RevCommit b = argWalk.next();
				if (b == null) {
					break;
				}
				outw.println(b.getId().name());
			}
		} catch (IOException e) {
			throw die(e.getMessage(), e);
		}
	}
}