/*
    * Copyright (C) 2015, Google 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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  package org.eclipse.jgit.junit;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  
  import java.util.Date;
  import java.util.regex.Pattern;
  
  import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
  import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
  import org.eclipse.jgit.lib.AnyObjectId;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ObjectLoader;
  import org.eclipse.jgit.lib.PersonIdent;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.revwalk.RevBlob;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.revwalk.RevObject;
  import org.eclipse.jgit.revwalk.RevWalk;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  public class TestRepositoryTest {
  	private TestRepository<InMemoryRepository> tr;
  	private InMemoryRepository repo;
  	private RevWalk rw;
  
  	@Before
  	public void setUp() throws Exception {
  		tr = new TestRepository<>(new InMemoryRepository(
  				new DfsRepositoryDescription("test")));
  		repo = tr.getRepository();
  		rw = tr.getRevWalk();
  	}
  
  	@After
  	public void tearDown() {
  		rw.close();
  		repo.close();
  	}
  
  	@Test
  	public void insertChangeId() throws Exception {
  		RevCommit c1 = tr.commit().message("message").insertChangeId().create();
  		rw.parseBody(c1);
  		assertTrue(Pattern.matches(
  				"^message\n\nChange-Id: I[0-9a-f]{40}\n$", c1.getFullMessage()));
  
 		RevCommit c2 = tr.commit().message("").insertChangeId().create();
 		rw.parseBody(c2);
 		assertEquals("\n\nChange-Id: I0000000000000000000000000000000000000000\n",
 				c2.getFullMessage());
 	}
 
 	@Test
 	public void insertChangeIdIgnoresExisting() throws Exception {
 		String msg = "message\n"
 				+ "\n"
 				+	"Change-Id: Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef\n";
 		RevCommit c = tr.commit().message(msg).insertChangeId().create();
 		rw.parseBody(c);
 		assertEquals(msg, c.getFullMessage());
 	}
 
 	@Test
 	public void insertExplicitChangeId() throws Exception {
 		RevCommit c = tr.commit().message("message")
 				.insertChangeId("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef")
 				.create();
 		rw.parseBody(c);
 		assertEquals("message\n\n"
 				+ "Change-Id: Ideadbeefdeadbeefdeadbeefdeadbeefdeadbeef\n"
 				, c.getFullMessage());
 	}
 
 	@Test
 	public void resetFromSymref() throws Exception {
 		repo.updateRef("HEAD").link("refs/heads/master");
 		Ref head = repo.exactRef("HEAD");
 		RevCommit master = tr.branch("master").commit().create();
 		RevCommit branch = tr.branch("branch").commit().create();
 		RevCommit detached = tr.commit().create();
 
 		assertTrue(head.isSymbolic());
 		assertEquals("refs/heads/master", head.getTarget().getName());
 		assertEquals(master, repo.exactRef("refs/heads/master").getObjectId());
 		assertEquals(branch, repo.exactRef("refs/heads/branch").getObjectId());
 
 		// Reset to branches preserves symref.
 		tr.reset("master");
 		head = repo.exactRef("HEAD");
 		assertEquals(master, head.getObjectId());
 		assertTrue(head.isSymbolic());
 		assertEquals("refs/heads/master", head.getTarget().getName());
 
 		tr.reset("branch");
 		head = repo.exactRef("HEAD");
 		assertEquals(branch, head.getObjectId());
 		assertTrue(head.isSymbolic());
 		assertEquals("refs/heads/master", head.getTarget().getName());
 		ObjectId lastHeadBeforeDetach = head.getObjectId().copy();
 
 		// Reset to a SHA-1 detaches.
 		tr.reset(detached);
 		head = repo.exactRef("HEAD");
 		assertEquals(detached, head.getObjectId());
 		assertFalse(head.isSymbolic());
 
 		tr.reset(detached.name());
 		head = repo.exactRef("HEAD");
 		assertEquals(detached, head.getObjectId());
 		assertFalse(head.isSymbolic());
 
 		// Reset back to a branch remains detached.
 		tr.reset("master");
 		head = repo.exactRef("HEAD");
 		assertEquals(lastHeadBeforeDetach, head.getObjectId());
 		assertFalse(head.isSymbolic());
 	}
 
 	@Test
 	public void resetFromDetachedHead() throws Exception {
 		Ref head = repo.exactRef("HEAD");
 		RevCommit master = tr.branch("master").commit().create();
 		RevCommit branch = tr.branch("branch").commit().create();
 		RevCommit detached = tr.commit().create();
 
 		assertNull(head);
 		assertEquals(master, repo.exactRef("refs/heads/master").getObjectId());
 		assertEquals(branch, repo.exactRef("refs/heads/branch").getObjectId());
 
 		tr.reset("master");
 		head = repo.exactRef("HEAD");
 		assertEquals(master, head.getObjectId());
 		assertFalse(head.isSymbolic());
 
 		tr.reset("branch");
 		head = repo.exactRef("HEAD");
 		assertEquals(branch, head.getObjectId());
 		assertFalse(head.isSymbolic());
 
 		tr.reset(detached);
 		head = repo.exactRef("HEAD");
 		assertEquals(detached, head.getObjectId());
 		assertFalse(head.isSymbolic());
 
 		tr.reset(detached.name());
 		head = repo.exactRef("HEAD");
 		assertEquals(detached, head.getObjectId());
 		assertFalse(head.isSymbolic());
 	}
 
 	@Test
 	public void amendRef() throws Exception {
 		RevCommit root = tr.commit()
 				.add("todelete", "to be deleted")
 				.create();
 		RevCommit orig = tr.commit().parent(root)
 				.rm("todelete")
 				.add("foo", "foo contents")
 				.add("bar", "bar contents")
 				.add("dir/baz", "baz contents")
 				.create();
 		rw.parseBody(orig);
 		tr.branch("master").update(orig);
 		assertEquals("foo contents", blobAsString(orig, "foo"));
 		assertEquals("bar contents", blobAsString(orig, "bar"));
 		assertEquals("baz contents", blobAsString(orig, "dir/baz"));
 
 		RevCommit amended = tr.amendRef("master")
 				.tick(3)
 				.add("bar", "fixed bar contents")
 				.create();
 		assertEquals(amended, repo.exactRef("refs/heads/master").getObjectId());
 		rw.parseBody(amended);
 
 		assertEquals(1, amended.getParentCount());
 		assertEquals(root, amended.getParent(0));
 		assertEquals(orig.getFullMessage(), amended.getFullMessage());
 		assertEquals(orig.getAuthorIdent(), amended.getAuthorIdent());
 
 		// Committer name/email is the same, but time was incremented.
 		assertEquals(new PersonIdent(orig.getCommitterIdent(), new Date(0)),
 				new PersonIdent(amended.getCommitterIdent(), new Date(0)));
 		assertTrue(orig.getCommitTime() < amended.getCommitTime());
 
 		assertEquals("foo contents", blobAsString(amended, "foo"));
 		assertEquals("fixed bar contents", blobAsString(amended, "bar"));
 		assertEquals("baz contents", blobAsString(amended, "dir/baz"));
 		assertNull(TreeWalk.forPath(repo, "todelete", amended.getTree()));
 	}
 
 	@Test
 	public void amendHead() throws Exception {
 		repo.updateRef("HEAD").link("refs/heads/master");
 		RevCommit root = tr.commit()
 				.add("foo", "foo contents")
 				.create();
 		RevCommit orig = tr.commit().parent(root)
 				.message("original message")
 				.add("bar", "bar contents")
 				.create();
 		tr.branch("master").update(orig);
 
 		RevCommit amended = tr.amendRef("HEAD")
 				.add("foo", "fixed foo contents")
 				.create();
 
 		Ref head = repo.exactRef(Constants.HEAD);
 		assertEquals(amended, head.getObjectId());
 		assertTrue(head.isSymbolic());
 		assertEquals("refs/heads/master", head.getTarget().getName());
 
 		rw.parseBody(amended);
 		assertEquals("original message", amended.getFullMessage());
 		assertEquals("fixed foo contents", blobAsString(amended, "foo"));
 		assertEquals("bar contents", blobAsString(amended, "bar"));
 	}
 
 	@Test
 	public void amendCommit() throws Exception {
 		RevCommit root = tr.commit()
 				.add("foo", "foo contents")
 				.create();
 		RevCommit orig = tr.commit().parent(root)
 				.message("original message")
 				.add("bar", "bar contents")
 				.create();
 		RevCommit amended = tr.amend(orig.copy())
 				.add("foo", "fixed foo contents")
 				.create();
 
 		rw.parseBody(amended);
 		assertEquals("original message", amended.getFullMessage());
 		assertEquals("fixed foo contents", blobAsString(amended, "foo"));
 		assertEquals("bar contents", blobAsString(amended, "bar"));
 	}
 
 	@Test
 	public void commitToUnbornHead() throws Exception {
 		repo.updateRef("HEAD").link("refs/heads/master");
 		RevCommit root = tr.branch("HEAD").commit().create();
 		Ref ref = repo.exactRef(Constants.HEAD);
 		assertEquals(root, ref.getObjectId());
 		assertTrue(ref.isSymbolic());
 		assertEquals("refs/heads/master", ref.getTarget().getName());
 	}
 
 	@Test
 	public void cherryPick() throws Exception {
 		repo.updateRef("HEAD").link("refs/heads/master");
 		RevCommit head = tr.branch("master").commit()
 				.add("foo", "foo contents\n")
 				.create();
 		rw.parseBody(head);
 		RevCommit toPick = tr.commit()
 				.parent(tr.commit().create()) // Can't cherry-pick root.
 				.author(new PersonIdent("Cherrypick Author", "cpa@example.com",
 						tr.getDate(), tr.getTimeZone()))
 				.author(new PersonIdent("Cherrypick Committer", "cpc@example.com",
 						tr.getDate(), tr.getTimeZone()))
 				.message("message to cherry-pick")
 				.add("bar", "bar contents\n")
 				.create();
 		RevCommit result = tr.cherryPick(toPick);
 		rw.parseBody(result);
 
 		Ref headRef = tr.getRepository().exactRef("HEAD");
 		assertEquals(result, headRef.getObjectId());
 		assertTrue(headRef.isSymbolic());
 		assertEquals("refs/heads/master", headRef.getLeaf().getName());
 
 		assertEquals(1, result.getParentCount());
 		assertEquals(head, result.getParent(0));
 		assertEquals(toPick.getAuthorIdent(), result.getAuthorIdent());
 
 		// Committer name/email matches default, and time was incremented.
 		assertEquals(new PersonIdent(head.getCommitterIdent(), new Date(0)),
 				new PersonIdent(result.getCommitterIdent(), new Date(0)));
 		assertTrue(toPick.getCommitTime() < result.getCommitTime());
 
 		assertEquals("message to cherry-pick", result.getFullMessage());
 		assertEquals("foo contents\n", blobAsString(result, "foo"));
 		assertEquals("bar contents\n", blobAsString(result, "bar"));
 	}
 
 	@Test
 	public void cherryPickWithContentMerge() throws Exception {
 		RevCommit base = tr.branch("HEAD").commit()
 				.add("foo", "foo contents\n\n")
 				.create();
 		tr.branch("HEAD").commit()
 				.add("foo", "foo contents\n\nlast line\n")
 				.create();
 		RevCommit toPick = tr.commit()
 				.message("message to cherry-pick")
 				.parent(base)
 				.add("foo", "changed foo contents\n\n")
 				.create();
 		RevCommit result = tr.cherryPick(toPick);
 		rw.parseBody(result);
 
 		assertEquals("message to cherry-pick", result.getFullMessage());
 		assertEquals("changed foo contents\n\nlast line\n",
 				blobAsString(result, "foo"));
 	}
 
 	@Test
 	public void cherryPickWithIdenticalContents() throws Exception {
 		RevCommit base = tr.branch("HEAD").commit().add("foo", "foo contents\n")
 				.create();
 		RevCommit head = tr.branch("HEAD").commit()
 				.parent(base)
 				.add("bar", "bar contents\n")
 				.create();
 		RevCommit toPick = tr.commit()
 				.parent(base)
 				.message("message to cherry-pick")
 				.add("bar", "bar contents\n")
 				.create();
 		assertNotEquals(head, toPick);
 		assertNull(tr.cherryPick(toPick));
 		assertEquals(head, repo.exactRef("HEAD").getObjectId());
 	}
 
 	private String blobAsString(AnyObjectId treeish, String path)
 			throws Exception {
 		RevObject obj = tr.get(rw.parseTree(treeish), path);
 		assertSame(RevBlob.class, obj.getClass());
 		ObjectLoader loader = rw.getObjectReader().open(obj);
 		return new String(loader.getCachedBytes(), UTF_8);
 	}
 }