/*
    * Copyright (C) 2013, CloudBees, Inc.
    * 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.api;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collection;
  
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.RefNotFoundException;
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.eclipse.jgit.lib.ObjectId;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  import org.junit.runners.Parameterized.Parameter;
  import org.junit.runners.Parameterized.Parameters;
  
  @RunWith(Parameterized.class)
  public class DescribeCommandTest extends RepositoryTestCase {
  
  	private Git git;
  
  	@Parameter
  	public boolean useAnnotatedTags;
  
  	@Parameters
  	public static Collection<Boolean[]> getUseAnnotatedTagsValues() {
  		return Arrays.asList(new Boolean[][] { { Boolean.TRUE },
  				{ Boolean.FALSE } });
  	}
  
  	@Override
  	public void setUp() throws Exception {
  		super.setUp();
  		git = new Git(db);
  	}
  
  	@Test(expected = RefNotFoundException.class)
  	public void noTargetSet() throws Exception {
  		git.describe().call();
  	}
  
  	@Test
  	public void testDescribe() throws Exception {
  		ObjectId c1 = modify("aaa");
  
  		ObjectId c2 = modify("bbb");
  		tag("t1");
  
  		ObjectId c3 = modify("ccc");
  		tag("t2");
  
 		ObjectId c4 = modify("ddd");
 
 		assertNull(describe(c1));
 		assertNull(describe(c1, true));
 		assertEquals("t1", describe(c2));
 		assertEquals("t2", describe(c3));
 		assertEquals("t2-0-g44579eb", describe(c3, true));
 
 		assertNameStartsWith(c4, "3e563c5");
 		// the value verified with git-describe(1)
 		assertEquals("t2-1-g3e563c5", describe(c4));
 		assertEquals("t2-1-g3e563c5", describe(c4, true));
 
 		// test default target
 		assertEquals("t2-1-g3e563c5", git.describe().call());
 	}
 
 	/**
 	 * Make sure it finds a tag when not all ancestries include a tag.
 	 *
 	 * <pre>
 	 * c1 -+-> T  -
 	 *     |       |
 	 *     +-> c3 -+-> c4
 	 * </pre>
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void testDescribeBranch() throws Exception {
 		ObjectId c1 = modify("aaa");
 
 		ObjectId c2 = modify("bbb");
 		tag("t");
 
 		branch("b", c1);
 
 		ObjectId c3 = modify("ccc");
 
 		ObjectId c4 = merge(c2);
 
 		assertNameStartsWith(c4, "119892b");
 		assertEquals("t-2-g119892b", describe(c4)); // 2 commits: c4 and c3
 		assertNull(describe(c3));
 		assertNull(describe(c3, true));
 	}
 
 	private void branch(String name, ObjectId base) throws GitAPIException {
 		git.checkout().setCreateBranch(true).setName(name)
 				.setStartPoint(base.name()).call();
 	}
 
 	/**
 	 * When t2 dominates t1, it's clearly preferable to describe by using t2.
 	 *
 	 * <pre>
 	 * t1 -+-> t2  -
 	 *     |       |
 	 *     +-> c3 -+-> c4
 	 * </pre>
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void t1DominatesT2() throws Exception {
 		ObjectId c1 = modify("aaa");
 		tag("t1");
 
 		ObjectId c2 = modify("bbb");
 		tag("t2");
 
 		branch("b", c1);
 
 		ObjectId c3 = modify("ccc");
 
 		ObjectId c4 = merge(c2);
 
 		assertNameStartsWith(c4, "119892b");
 		assertEquals("t2-2-g119892b", describe(c4)); // 2 commits: c4 and c3
 
 		assertNameStartsWith(c3, "0244e7f");
 		assertEquals("t1-1-g0244e7f", describe(c3));
 	}
 
 	/**
 	 * When t1 is nearer than t2, t2 should be found
 	 *
 	 * <pre>
 	 * c1 -+-> c2 -> t1 -+
 	 *     |             |
 	 *     +-> t2 -> c3 -+-> c4
 	 * </pre>
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void t1nearerT2() throws Exception {
 		ObjectId c1 = modify("aaa");
 		modify("bbb");
 		ObjectId t1 = modify("ccc");
 		tag("t1");
 
 		branch("b", c1);
 		modify("ddd");
 		tag("t2");
 		modify("eee");
 		ObjectId c4 = merge(t1);
 
 		assertNameStartsWith(c4, "bb389a4");
 		assertEquals("t1-3-gbb389a4", describe(c4));
 	}
 
 	/**
 	 * When t1 and t2 have same depth native git seems to add the depths of both
 	 * paths
 	 *
 	 * <pre>
 	 * c1 -+-> t1 -> c2 -+
 	 *     |             |
 	 *     +-> t2 -> c3 -+-> c4
 	 * </pre>
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void t1sameDepthT2() throws Exception {
 		ObjectId c1 = modify("aaa");
 		modify("bbb");
 		tag("t1");
 		ObjectId c2 = modify("ccc");
 
 		branch("b", c1);
 		modify("ddd");
 		tag("t2");
 		modify("eee");
 		ObjectId c4 = merge(c2);
 
 		assertNameStartsWith(c4, "bb389a4");
 		assertEquals("t2-4-gbb389a4", describe(c4));
 	}
 
 	private ObjectId merge(ObjectId c2) throws GitAPIException {
 		return git.merge().include(c2).call().getNewHead();
 	}
 
 	private ObjectId modify(String content) throws Exception {
 		File a = new File(db.getWorkTree(), "a.txt");
 		touch(a, content);
 		return git.commit().setAll(true).setMessage(content).call().getId();
 	}
 
 	private void tag(String tag) throws GitAPIException {
 		TagCommand tagCommand = git.tag().setName(tag)
 				.setAnnotated(useAnnotatedTags);
 		if (useAnnotatedTags)
 			tagCommand.setMessage(tag);
 		tagCommand.call();
 	}
 
 	private static void touch(File f, String contents) throws Exception {
 		FileWriter w = new FileWriter(f);
 		w.write(contents);
 		w.close();
 	}
 
 	private String describe(ObjectId c1, boolean longDesc)
 			throws GitAPIException, IOException {
 		return git.describe().setTarget(c1).setLong(longDesc).call();
 	}
 
 	private String describe(ObjectId c1) throws GitAPIException, IOException {
 		return describe(c1, false);
 	}
 
 	private static void assertNameStartsWith(ObjectId c4, String prefix) {
 		assertTrue(c4.name(), c4.name().startsWith(prefix));
 	}
 }