/*
    * Copyright (C) 2015, 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.revwalk;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.util.Set;
  
  import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
  import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
  import org.eclipse.jgit.junit.TestRepository;
  import org.eclipse.jgit.lib.AnyObjectId;
  import org.eclipse.jgit.lib.Sets;
  import org.eclipse.jgit.revwalk.filter.MessageRevFilter;
  import org.eclipse.jgit.revwalk.filter.NotRevFilter;
  import org.eclipse.jgit.revwalk.filter.ObjectFilter;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  public class ObjectWalkFilterTest {
  	private TestRepository<InMemoryRepository> tr;
  	private ObjectWalk rw;
  
  	// 3 commits, 2 top-level trees, 4 subtrees, 3 blobs
  	private static final int OBJECT_COUNT = 12;
  
  	@Before
  	public void setUp() throws Exception {
  		tr = new TestRepository<>(new InMemoryRepository(
  				new DfsRepositoryDescription("test")));
  		rw = new ObjectWalk(tr.getRepository());
  
  		rw.markStart(tr.branch("master").commit()
  			.add("a/a", "1")
  			.add("b/b", "2")
  			.add("c/c", "3")
  			.message("initial commit")
  
  			.child()
  			.rm("a/a")
  			.add("a/A", "1")
  			.message("capitalize a/a")
  
  			.child()
  			.rm("a/A")
  			.add("a/a", "1")
  			.message("make a/A lowercase again")
  			.create());
  	}
  
  	@After
  	public void tearDown() {
  		rw.close();
  		tr.getRepository().close();
  	}
  
  	private static class BlacklistObjectFilter extends ObjectFilter {
  		final Set<AnyObjectId> badObjects;
  
  		BlacklistObjectFilter(Set<AnyObjectId> badObjects) {
  			this.badObjects = badObjects;
  		}
  
  		@Override
  		public boolean include(ObjectWalk walker, AnyObjectId o) {
  			return !badObjects.contains(o);
  		}
  	}
  
  	private AnyObjectId resolve(String revstr) throws Exception {
  		return tr.getRepository().resolve(revstr);
  	}
  
  	private int countObjects() throws IOException {
  		int n = 0;
  		while (rw.next() != null) {
  			n++;
  		}
  		while (rw.nextObject() != null) {
  			n++;
  		}
  		return n;
  	}
  
  	@Test
  	public void testDefaultFilter() throws Exception {
  		assertTrue("filter is ALL",
  				rw.getObjectFilter() == ObjectFilter.ALL);
 		assertEquals(OBJECT_COUNT, countObjects());
 	}
 
 	@Test
 	public void testObjectFilterCanFilterOutBlob() throws Exception {
 		AnyObjectId one = rw.parseAny(resolve("master:a/a"));
 		AnyObjectId two = rw.parseAny(resolve("master:b/b"));
 		rw.setObjectFilter(new BlacklistObjectFilter(Sets.of(one, two)));
 
 		// 2 blobs filtered out
 		assertEquals(OBJECT_COUNT - 2, countObjects());
 	}
 
 	@Test
 	public void testFilteringCommitsHasNoEffect() throws Exception {
 		AnyObjectId initial = rw.parseCommit(resolve("master^^"));
 		rw.setObjectFilter(new BlacklistObjectFilter(Sets.of(initial)));
 		assertEquals(OBJECT_COUNT, countObjects());
 	}
 
 	@Test
 	public void testRevFilterAndObjectFilterCanCombine() throws Exception {
 		AnyObjectId one = rw.parseAny(resolve("master:a/a"));
 		AnyObjectId two = rw.parseAny(resolve("master:b/b"));
 		rw.setObjectFilter(new BlacklistObjectFilter(Sets.of(one, two)));
 		rw.setRevFilter(NotRevFilter.create(
 				MessageRevFilter.create("capitalize")));
 
 		// 2 blobs, one commit, two trees filtered out
 		assertEquals(OBJECT_COUNT - 5, countObjects());
 	}
 
 	@Test
 	public void testFilteringTreeFiltersSubtrees() throws Exception {
 		AnyObjectId capitalizeTree = rw.parseAny(resolve("master^:"));
 		rw.setObjectFilter(new BlacklistObjectFilter(
 				Sets.of(capitalizeTree)));
 
 		// trees "master^:" and "master^:a" filtered out
 		assertEquals(OBJECT_COUNT - 2, countObjects());
 	}
 
 	@Test
 	public void testFilteringTreeFiltersReferencedBlobs() throws Exception {
 		AnyObjectId a1 = rw.parseAny(resolve("master:a"));
 		AnyObjectId a2 = rw.parseAny(resolve("master^:a"));
 		rw.setObjectFilter(new BlacklistObjectFilter(Sets.of(a1, a2)));
 
 		// 2 trees, one blob filtered out
 		assertEquals(OBJECT_COUNT - 3, countObjects());
 	}
 }