/*
    * Copyright (C) 2017, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.internal.storage.dfs;
  
  import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.COMPACT;
  import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.INSERT;
  import static org.eclipse.jgit.internal.storage.pack.PackExt.PACK;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  
  import org.eclipse.jgit.junit.TestRepository;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.junit.Before;
  import org.junit.Test;
  
  public class DfsPackCompacterTest {
  	private TestRepository<InMemoryRepository> git;
  	private InMemoryRepository repo;
  	private DfsObjDatabase odb;
  
  	@Before
  	public void setUp() throws IOException {
  		DfsRepositoryDescription desc = new DfsRepositoryDescription("test");
  		git = new TestRepository<>(new InMemoryRepository(desc));
  		repo = git.getRepository();
  		odb = repo.getObjectDatabase();
  	}
  
  	@Test
  	public void testEstimateCompactPackSizeInNewRepo() throws Exception {
  		RevCommit commit0 = commit().message("0").create();
  		RevCommit commit1 = commit().message("1").parent(commit0).create();
  		git.update("master", commit1);
  
  		// Packs start out as INSERT.
  		long inputPacksSize = 32;
  		assertEquals(2, odb.getPacks().length);
  		for (DfsPackFile pack : odb.getPacks()) {
  			assertEquals(INSERT, pack.getPackDescription().getPackSource());
  			inputPacksSize += pack.getPackDescription().getFileSize(PACK) - 32;
  		}
  
  		compact();
  
  		// INSERT packs are compacted into a single COMPACT pack.
  		assertEquals(1, odb.getPacks().length);
  		DfsPackFile pack = odb.getPacks()[0];
  		assertEquals(COMPACT, pack.getPackDescription().getPackSource());
  		assertEquals(inputPacksSize,
  				pack.getPackDescription().getEstimatedPackSize());
  	}
  
  	@Test
  	public void testEstimateGcPackSizeWithAnExistingGcPack() throws Exception {
  		RevCommit commit0 = commit().message("0").create();
  		RevCommit commit1 = commit().message("1").parent(commit0).create();
  		git.update("master", commit1);
  
  		compact();
  
  		RevCommit commit2 = commit().message("2").parent(commit1).create();
  		git.update("master", commit2);
  
  		// There will be one INSERT pack and one COMPACT pack.
  		assertEquals(2, odb.getPacks().length);
  		boolean compactPackFound = false;
  		boolean insertPackFound = false;
  		long inputPacksSize = 32;
  		for (DfsPackFile pack : odb.getPacks()) {
  			DfsPackDescription packDescription = pack.getPackDescription();
  			if (packDescription.getPackSource() == COMPACT) {
  				compactPackFound = true;
  			}
  			if (packDescription.getPackSource() == INSERT) {
  				insertPackFound = true;
  			}
  			inputPacksSize += packDescription.getFileSize(PACK) - 32;
  		}
  		assertTrue(compactPackFound);
  		assertTrue(insertPackFound);
  
  		compact();
  
  		// INSERT pack is combined into the COMPACT pack.
  		DfsPackFile pack = odb.getPacks()[0];
  		assertEquals(COMPACT, pack.getPackDescription().getPackSource());
  		assertEquals(inputPacksSize,
  				pack.getPackDescription().getEstimatedPackSize());
  	}
 
 	private TestRepository<InMemoryRepository>.CommitBuilder commit() {
 		return git.commit();
 	}
 
 	private void compact() throws IOException {
 		DfsPackCompactor compactor = new DfsPackCompactor(repo);
 		compactor.autoAdd();
 		compactor.compact(null);
 		odb.clearCache();
 	}
 }