/*
 * Copyright (C) 2012, Christian Halstrick <christian.halstrick@sap.com>
 * 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.internal.storage.file;

import static org.junit.Assert.assertEquals;

import java.io.File;
import java.util.Collections;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.junit.TestRepository.BranchBuilder;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.util.FileUtils;
import org.junit.Test;

public class GcReflogTest extends GcTestCase {
	@Test
	public void testPruneNone() throws Exception {
		BranchBuilder bb = tr.branch("refs/heads/master");
		bb.commit().add("A", "A").add("B", "B").create();
		bb.commit().add("A", "A2").add("B", "B2").create();
		new File(repo.getDirectory(), Constants.LOGS + "/refs/heads/master")
				.delete();
		stats = gc.getStatistics();
		assertEquals(8, stats.numberOfLooseObjects);
		gc.setExpireAgeMillis(0);
		fsTick();
		gc.prune(Collections.<ObjectId> emptySet());
		stats = gc.getStatistics();
		assertEquals(8, stats.numberOfLooseObjects);
		tr.blob("x");
		stats = gc.getStatistics();
		assertEquals(9, stats.numberOfLooseObjects);
		fsTick();
		gc.prune(Collections.<ObjectId> emptySet());
		stats = gc.getStatistics();
		assertEquals(8, stats.numberOfLooseObjects);
	}

	@Test
	public void testPackRepoWithCorruptReflog() throws Exception {
		// create a reflog entry "0000... 0000... foobar" by doing an initial
		// refupdate for HEAD which points to a non-existing ref. The
		// All-Projects repo of gerrit instances had such entries
		RefUpdate ru = repo.updateRef(Constants.HEAD);
		ru.link("refs/to/garbage");
		tr.branch("refs/heads/master").commit().add("A", "A").add("B", "B")
				.create();
		// make sure HEAD exists
		Git.wrap(repo).checkout().setName("refs/heads/master").call();
		gc.gc();
	}

	@Test
	public void testPackCommitsAndLooseOneNoReflog() throws Exception {
		BranchBuilder bb = tr.branch("refs/heads/master");
		RevCommit first = bb.commit().add("A", "A").add("B", "B").create();
		bb.commit().add("A", "A2").add("B", "B2").create();
		tr.update("refs/heads/master", first);

		stats = gc.getStatistics();
		assertEquals(8, stats.numberOfLooseObjects);
		assertEquals(0, stats.numberOfPackedObjects);

		FileUtils.delete(new File(repo.getDirectory(), "logs/HEAD"),
				FileUtils.RETRY | FileUtils.SKIP_MISSING);
		FileUtils.delete(
				new File(repo.getDirectory(), "logs/refs/heads/master"),
				FileUtils.RETRY | FileUtils.SKIP_MISSING);
		gc.gc();

		stats = gc.getStatistics();
		assertEquals(4, stats.numberOfLooseObjects);
		assertEquals(4, stats.numberOfPackedObjects);
		assertEquals(1, stats.numberOfPackFiles);
	}

	@Test
	public void testPackCommitsAndLooseOneWithPruneNowNoReflog()
			throws Exception {
		BranchBuilder bb = tr.branch("refs/heads/master");
		RevCommit first = bb.commit().add("A", "A").add("B", "B").create();
		bb.commit().add("A", "A2").add("B", "B2").create();
		tr.update("refs/heads/master", first);

		stats = gc.getStatistics();
		assertEquals(8, stats.numberOfLooseObjects);
		assertEquals(0, stats.numberOfPackedObjects);

		FileUtils.delete(new File(repo.getDirectory(), "logs/HEAD"),
				FileUtils.RETRY | FileUtils.SKIP_MISSING);
		FileUtils.delete(
				new File(repo.getDirectory(), "logs/refs/heads/master"),
				FileUtils.RETRY | FileUtils.SKIP_MISSING);
		gc.setExpireAgeMillis(0);
		gc.gc();

		stats = gc.getStatistics();
		assertEquals(0, stats.numberOfLooseObjects);
		assertEquals(4, stats.numberOfPackedObjects);
		assertEquals(1, stats.numberOfPackFiles);
	}
}