/*
    * 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
    *
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   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
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   * - 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
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   *   with the distribution.
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  package org.eclipse.jgit.api;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertNotNull;
  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(0)
  	public boolean useAnnotatedTags;
  
  	@Parameter(1)
  	public boolean describeUseAllTags;
  
  	@Parameters(name = "git tag -a {0}?-a: with git describe {1}?--tags:")
  	public static Collection<Boolean[]> getUseAnnotatedTagsValues() {
  		return Arrays.asList(new Boolean[][] { { Boolean.TRUE, Boolean.FALSE },
  				{ Boolean.FALSE, Boolean.FALSE },
  				{ Boolean.TRUE, Boolean.TRUE },
  				{ Boolean.FALSE, Boolean.TRUE } });
  	}
  
  	@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("alice-t1");
 
 		ObjectId c3 = modify("ccc");
 		tag("bob-t2");
 
 		ObjectId c4 = modify("ddd");
 		assertNameStartsWith(c4, "3e563c5");
 
 		assertNull(describe(c1));
 		assertNull(describe(c1, true));
 		assertNull(describe(c1, "a*", "b*", "c*"));
 		assertNull(describe(c2, "bob*"));
 		assertNull(describe(c2, "?ob*"));
 
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("alice-t1", describe(c2));
 			assertEquals("alice-t1", describe(c2, "alice*"));
 			assertEquals("alice-t1", describe(c2, "a*", "b*", "c*"));
 
 			assertEquals("bob-t2", describe(c3));
 			assertEquals("bob-t2-0-g44579eb", describe(c3, true));
 			assertEquals("alice-t1-1-g44579eb", describe(c3, "alice*"));
 			assertEquals("alice-t1-1-g44579eb", describe(c3, "a??c?-t*"));
 			assertEquals("bob-t2", describe(c3, "bob*"));
 			assertEquals("bob-t2", describe(c3, "?ob*"));
 			assertEquals("bob-t2", describe(c3, "a*", "b*", "c*"));
 
 			// the value verified with git-describe(1)
 			assertEquals("bob-t2-1-g3e563c5", describe(c4));
 			assertEquals("bob-t2-1-g3e563c5", describe(c4, true));
 			assertEquals("alice-t1-2-g3e563c5", describe(c4, "alice*"));
 			assertEquals("bob-t2-1-g3e563c5", describe(c4, "bob*"));
 			assertEquals("bob-t2-1-g3e563c5", describe(c4, "a*", "b*", "c*"));
 		} else {
 			assertEquals(null, describe(c2));
 			assertEquals(null, describe(c3));
 			assertEquals(null, describe(c4));
 		}
 
 		// test default target
 		if (useAnnotatedTags) {
 			assertEquals("bob-t2-1-g3e563c5", git.describe().call());
 			assertEquals("bob-t2-1-g3e563c5",
 					git.describe().setTags(false).call());
 			assertEquals("bob-t2-1-g3e563c5",
 					git.describe().setTags(true).call());
 		} else {
 			assertEquals(null, git.describe().call());
 			assertEquals(null, git.describe().setTags(false).call());
 			assertEquals("bob-t2-1-g3e563c5",
 					git.describe().setTags(true).call());
 		}
 	}
 
 	@Test
 	public void testDescribeMultiMatch() throws Exception {
 		ObjectId c1 = modify("aaa");
 		tag("v1.0.0");
 		tick();
 		tag("v1.0.1");
 		tick();
 		tag("v1.1.0");
 		tick();
 		tag("v1.1.1");
 		ObjectId c2 = modify("bbb");
 
 		if (!useAnnotatedTags && !describeUseAllTags) {
 			assertEquals(null, describe(c1));
 			assertEquals(null, describe(c2));
 			return;
 		}
 
 		// Ensure that if we're interested in any tags, we get the most recent tag
 		// as per Git behaviour since 1.7.1.1
 		if (useAnnotatedTags) {
 			assertEquals("v1.1.1", describe(c1));
 			assertEquals("v1.1.1-1-gb89dead", describe(c2));
 			// Ensure that if we're only interested in one of multiple tags, we get the right match
 			assertEquals("v1.0.1", describe(c1, "v1.0*"));
 			assertEquals("v1.1.1", describe(c1, "v1.1*"));
 			assertEquals("v1.0.1-1-gb89dead", describe(c2, "v1.0*"));
 			assertEquals("v1.1.1-1-gb89dead", describe(c2, "v1.1*"));
 
 			// Ensure that ordering of match precedence is preserved as per Git behaviour
 			assertEquals("v1.1.1", describe(c1, "v1.0*", "v1.1*"));
 			assertEquals("v1.1.1", describe(c1, "v1.1*", "v1.0*"));
 			assertEquals("v1.1.1-1-gb89dead", describe(c2, "v1.0*", "v1.1*"));
 			assertEquals("v1.1.1-1-gb89dead", describe(c2, "v1.1*", "v1.0*"));
 		} else {
 			// no timestamps so no guarantees on which tag is chosen
 			assertNotNull(describe(c1));
 			assertNotNull(describe(c2));
 
 			assertNotNull(describe(c1, "v1.0*"));
 			assertNotNull(describe(c1, "v1.1*"));
 			assertNotNull(describe(c2, "v1.0*"));
 			assertNotNull(describe(c2, "v1.1*"));
 
 			// Ensure that ordering of match precedence is preserved as per Git behaviour
 			assertNotNull(describe(c1, "v1.0*", "v1.1*"));
 			assertNotNull(describe(c1, "v1.1*", "v1.0*"));
 			assertNotNull(describe(c2, "v1.0*", "v1.1*"));
 			assertNotNull(describe(c2, "v1.1*", "v1.0*"));
 
 		}
 	}
 
 	/**
 	 * Make sure it finds a tag when not all ancestries include a tag.
 	 *
 	 * <pre>
 	 * c1 -+-&gt; T  -
 	 *     |       |
 	 *     +-&gt; c3 -+-&gt; 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");
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("2 commits: c4 and c3", "t-2-g119892b", describe(c4));
 		} else {
 			assertEquals(null, describe(c4));
 		}
 		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 -+-&gt; t2  -
 	 *     |       |
 	 *     +-&gt; c3 -+-&gt; 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");
 		assertNameStartsWith(c3, "0244e7f");
 
 		ObjectId c4 = merge(c2);
 
 		assertNameStartsWith(c4, "119892b");
 
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("t2-2-g119892b", describe(c4)); // 2 commits: c4 and c3
 			assertEquals("t1-1-g0244e7f", describe(c3));
 		} else {
 			assertEquals(null, describe(c4));
 			assertEquals(null, describe(c3));
 		}
 	}
 
 	/**
 	 * When t1 annotated dominates t2 lightweight tag
 	 *
 	 * <pre>
 	 * t1 -+-> t2  -
 	 *     |       |
 	 *     +-> c3 -+-> c4
 	 * </pre>
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void t1AnnotatedDominatesT2lightweight() throws Exception {
 		ObjectId c1 = modify("aaa");
 		tag("t1", useAnnotatedTags);
 
 		ObjectId c2 = modify("bbb");
 		tag("t2", false);
 
 		assertNameStartsWith(c2, "3747db3");
 		if (useAnnotatedTags && !describeUseAllTags) {
 			assertEquals(
 					"only annotated tag t1 expected to be used for describe",
 					"t1-1-g3747db3", describe(c2)); // 1 commits: t2 overridden
 													// by t1
 		} else if (!useAnnotatedTags && !describeUseAllTags) {
 			assertEquals("no commits to describe expected", null, describe(c2));
 		} else {
 			assertEquals("lightweight tag t2 expected in describe", "t2",
 					describe(c2));
 		}
 
 		branch("b", c1);
 
 		ObjectId c3 = modify("ccc");
 
 		assertNameStartsWith(c3, "0244e7f");
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("t1-1-g0244e7f", describe(c3));
 		}
 
 		ObjectId c4 = merge(c2);
 
 		assertNameStartsWith(c4, "119892b");
 		if (describeUseAllTags) {
 			assertEquals(
 					"2 commits for describe commit increment expected since lightweight tag: c4 and c3",
 					"t2-2-g119892b", describe(c4)); // 2 commits: c4 and c3
 		} else if (!useAnnotatedTags && !describeUseAllTags) {
 			assertEquals("no matching commits expected", null, describe(c4));
 		} else {
 			assertEquals(
 					"3 commits for describe commit increment expected since annotated tag: c4 and c3 and c2",
 					"t1-3-g119892b", describe(c4)); //
 		}
 	}
 
 	/**
 	 * When t1 is nearer than t2, t2 should be found
 	 *
 	 * <pre>
 	 * c1 -+-&gt; c2 -&gt; t1 -+
 	 *     |             |
 	 *     +-&gt; t2 -&gt; c3 -+-&gt; 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");
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("t1-3-gbb389a4", describe(c4));
 		} else {
 			assertEquals(null, describe(c4));
 		}
 	}
 
 	/**
 	 * When t1 and t2 have same depth native git seems to add the depths of both
 	 * paths
 	 *
 	 * <pre>
 	 * c1 -+-&gt; t1 -&gt; c2 -+
 	 *     |             |
 	 *     +-&gt; t2 -&gt; c3 -+-&gt; 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");
 		if (useAnnotatedTags || describeUseAllTags) {
 			assertEquals("t2-4-gbb389a4", describe(c4));
 		} else {
 			assertEquals(null, 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 {
 		tag(tag, this.useAnnotatedTags);
 	}
 
 	private void tag(String tag, boolean annotatedTag) throws GitAPIException {
 		TagCommand tagCommand = git.tag().setName(tag)
 				.setAnnotated(annotatedTag);
 		if (annotatedTag) {
 			tagCommand.setMessage(tag);
 		}
 		tagCommand.call();
 	}
 
 	private static void touch(File f, String contents) throws Exception {
 		try (FileWriter w = new FileWriter(f)) {
 			w.write(contents);
 		}
 	}
 
 	private String describe(ObjectId c1, boolean longDesc)
 			throws GitAPIException, IOException {
 		return git.describe().setTarget(c1).setTags(describeUseAllTags)
 				.setLong(longDesc).call();
 	}
 
 	private String describe(ObjectId c1) throws GitAPIException, IOException {
 		return describe(c1, false);
 	}
 
 	private String describe(ObjectId c1, String... patterns) throws Exception {
 		return git.describe().setTarget(c1).setTags(describeUseAllTags)
 				.setMatch(patterns).call();
 	}
 
 	private static void assertNameStartsWith(ObjectId c4, String prefix) {
 		assertTrue(c4.name(), c4.name().startsWith(prefix));
 	}
 }