/*
 * 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 static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

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

import org.eclipse.jgit.junit.TestRepository.BranchBuilder;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.revwalk.RevBlob;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.junit.Test;

public class GcPruneNonReferencedTest extends GcTestCase {
	@Test
	public void nonReferencedNonExpiredObject_notPruned() throws Exception {
		RevBlob a = tr.blob("a");
		gc.setExpire(new Date(lastModified(a)));
		gc.prune(Collections.<ObjectId> emptySet());
		assertTrue(repo.hasObject(a));
	}

	@Test
	public void nonReferencedExpiredObject_pruned() throws Exception {
		RevBlob a = tr.blob("a");
		gc.setExpireAgeMillis(0);
		fsTick();
		gc.prune(Collections.<ObjectId> emptySet());
		assertFalse(repo.hasObject(a));
	}

	@Test
	public void nonReferencedExpiredObjectTree_pruned() throws Exception {
		RevBlob a = tr.blob("a");
		RevTree t = tr.tree(tr.file("a", a));
		gc.setExpireAgeMillis(0);
		fsTick();
		gc.prune(Collections.<ObjectId> emptySet());
		assertFalse(repo.hasObject(t));
		assertFalse(repo.hasObject(a));
	}

	@Test
	public void nonReferencedObjects_onlyExpiredPruned() throws Exception {
		RevBlob a = tr.blob("a");
		gc.setExpire(new Date(lastModified(a) + 1));

		fsTick();
		RevBlob b = tr.blob("b");

		gc.prune(Collections.<ObjectId> emptySet());
		assertFalse(repo.hasObject(a));
		assertTrue(repo.hasObject(b));
	}

	@Test
	public void testPackCommitsAndLooseOneWithPruneNow() 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);
		gc.setExpireAgeMillis(0);
		fsTick();
		gc.gc();
		stats = gc.getStatistics();
		assertNoEmptyFanoutDirectories();
		assertEquals(0, stats.numberOfLooseObjects);
		assertEquals(8, stats.numberOfPackedObjects);
		assertEquals(2, stats.numberOfPackFiles);
	}

	private void assertNoEmptyFanoutDirectories() {
		File[] fanout = repo.getObjectsDirectory().listFiles();
		for (File f : fanout) {
			if (f.isDirectory()) {
				String[] entries = f.list();
				if (entries == null || entries.length == 0) {
					assertFalse(
							"Found empty fanout directory "
									+ f.getAbsolutePath() + " after pruning",
							f.getName().length() == 2);
				}
			}
		}
	}
}