/*
    * Copyright (C) 2014, Robin Stocker <robin@nibor.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,
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   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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  package org.eclipse.jgit.revwalk;
  
  import static java.util.Arrays.asList;
  import static org.junit.Assert.assertEquals;
  
  import java.util.Collection;
  import java.util.List;
  
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.RefComparator;
  import org.junit.Test;
  
  public class RevWalkUtilsReachableTest extends RevWalkTestCase {
  
  	@Test
  	public void oneCommit() throws Exception {
  		RevCommit a = commit();
  		Ref branchA = branch("a", a);
  
  		assertContains(a, asList(branchA));
  	}
  
  	@Test
  	public void twoCommits() throws Exception {
  		RevCommit a = commit();
  		RevCommit b = commit(a);
  		branch("a", a);
  		Ref branchB = branch("b", b);
  
  		assertContains(b, asList(branchB));
  	}
  
  	@Test
  	public void multipleBranches() throws Exception {
  		RevCommit a = commit();
  		RevCommit b = commit(a);
  		branch("a", a);
  		Ref branchB = branch("b", b);
  		Ref branchB2 = branch("b2", b);
  
  		assertContains(b, asList(branchB, branchB2));
  	}
  
  	@Test
  	public void withMerge() throws Exception {
  		RevCommit a = commit();
  		RevCommit b = commit();
  		RevCommit c = commit(a, b);
  		Ref branchA = branch("a", a);
  		Ref branchB = branch("b", b);
  		Ref branchC = branch("c", c);
  
  		assertContains(a, asList(branchA, branchC));
  		assertContains(b, asList(branchB, branchC));
  	}
 
 	@Test
 	public void withCommitLoadedByDifferentRevWalk() throws Exception {
 		RevCommit a = commit();
 		Ref branchA = branch("a", a);
 
 		try (RevWalk walk = new RevWalk(db)) {
 			RevCommit parsedCommit = walk.parseCommit(a.getId());
 			assertContains(parsedCommit, asList(branchA));
 		}
 	}
 
 	private Ref branch(String name, RevCommit dst) throws Exception {
 		return Git.wrap(db).branchCreate().setName(name)
 				.setStartPoint(dst.name()).call();
 	}
 
 	private void assertContains(RevCommit commit, Collection<Ref> refsThatShouldContainCommit) throws Exception {
 		Collection<Ref> allRefs = db.getRefDatabase().getRefs();
 		Collection<Ref> sortedRefs = RefComparator.sort(allRefs);
 		List<Ref> actual = RevWalkUtils.findBranchesReachableFrom(commit,
 				rw, sortedRefs);
 		assertEquals(refsThatShouldContainCommit, actual);
 	}
 
 }