/*
    * Copyright (C) 2012, GitHub 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.api;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.List;
  
  import org.eclipse.jgit.api.errors.UnmergedPathsException;
  import org.eclipse.jgit.diff.DiffEntry;
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.PersonIdent;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.ReflogEntry;
  import org.eclipse.jgit.lib.ReflogReader;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.revwalk.RevWalk;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.eclipse.jgit.treewalk.filter.TreeFilter;
  import org.eclipse.jgit.util.FileUtils;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Unit tests of {@link StashCreateCommand}
   */
  public class StashCreateCommandTest extends RepositoryTestCase {
  
  	private RevCommit head;
  
  	private Git git;
  
  	private File committedFile;
  
  	private File untrackedFile;
  
  	@Before
  	public void setUp() throws Exception {
  		super.setUp();
  		git = Git.wrap(db);
  		committedFile = writeTrashFile("file.txt", "content");
  		git.add().addFilepattern("file.txt").call();
  		head = git.commit().setMessage("add file").call();
  		assertNotNull(head);
  		untrackedFile = writeTrashFile("untracked.txt", "content");
  	}
  
  	private void validateStashedCommit(final RevCommit commit)
  			throws IOException {
  		validateStashedCommit(commit, 2);
  	}
 
 	/**
 	 * Core validation to be performed on all stashed commits
 	 *
 	 * @param commit
 	 * @param parentCount
 	 *            number of parent commits required
 	 * @throws IOException
 	 */
 	private void validateStashedCommit(final RevCommit commit,
 			int parentCount)
 			throws IOException {
 		assertNotNull(commit);
 		Ref stashRef = db.exactRef(Constants.R_STASH);
 		assertNotNull(stashRef);
 		assertEquals(commit, stashRef.getObjectId());
 		assertNotNull(commit.getAuthorIdent());
 		assertEquals(commit.getAuthorIdent(), commit.getCommitterIdent());
 		assertEquals(parentCount, commit.getParentCount());
 
 		// Load parents
 		try (RevWalk walk = new RevWalk(db)) {
 			for (RevCommit parent : commit.getParents())
 				walk.parseBody(parent);
 		}
 
 		assertEquals(1, commit.getParent(1).getParentCount());
 		assertEquals(head, commit.getParent(1).getParent(0));
 		assertFalse("Head tree matches stashed commit tree", commit.getTree()
 				.equals(head.getTree()));
 		assertEquals(head, commit.getParent(0));
 		assertFalse(commit.getFullMessage().equals(
 				commit.getParent(1).getFullMessage()));
 	}
 
 	private TreeWalk createTreeWalk() {
 		TreeWalk walk = new TreeWalk(db);
 		walk.setRecursive(true);
 		walk.setFilter(TreeFilter.ANY_DIFF);
 		return walk;
 	}
 
 	private List<DiffEntry> diffWorkingAgainstHead(final RevCommit commit)
 			throws IOException {
 		try (TreeWalk walk = createTreeWalk()) {
 			walk.addTree(commit.getParent(0).getTree());
 			walk.addTree(commit.getTree());
 			return DiffEntry.scan(walk);
 		}
 	}
 
 	private List<DiffEntry> diffIndexAgainstHead(final RevCommit commit)
 			throws IOException {
 		try (TreeWalk walk = createTreeWalk()) {
 			walk.addTree(commit.getParent(0).getTree());
 			walk.addTree(commit.getParent(1).getTree());
 			return DiffEntry.scan(walk);
 		}
 	}
 
 	private List<DiffEntry> diffIndexAgainstWorking(final RevCommit commit)
 			throws IOException {
 		try (TreeWalk walk = createTreeWalk()) {
 			walk.addTree(commit.getParent(1).getTree());
 			walk.addTree(commit.getTree());
 			return DiffEntry.scan(walk);
 		}
 	}
 
 	@Test
 	public void noLocalChanges() throws Exception {
 		assertNull(git.stashCreate().call());
 	}
 
 	@Test
 	public void workingDirectoryDelete() throws Exception {
 		deleteTrashFile("file.txt");
 		RevCommit stashed = git.stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertEquals(head.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, diffs.size());
 		assertEquals(DiffEntry.ChangeType.DELETE, diffs.get(0).getChangeType());
 		assertEquals("file.txt", diffs.get(0).getOldPath());
 	}
 
 	@Test
 	public void indexAdd() throws Exception {
 		File addedFile = writeTrashFile("file2.txt", "content2");
 		git.add().addFilepattern("file2.txt").call();
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertFalse(addedFile.exists());
 		validateStashedCommit(stashed);
 
 		assertEquals(stashed.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, diffs.size());
 		assertEquals(DiffEntry.ChangeType.ADD, diffs.get(0).getChangeType());
 		assertEquals("file2.txt", diffs.get(0).getNewPath());
 	}
 
 	@Test
 	public void newFileInIndexThenModifiedInWorkTree() throws Exception {
 		writeTrashFile("file", "content");
 		git.add().addFilepattern("file").call();
 		writeTrashFile("file", "content2");
 		RevCommit stashedWorkTree = Git.wrap(db).stashCreate().call();
 		validateStashedCommit(stashedWorkTree);
 		try (RevWalk walk = new RevWalk(db)) {
 			RevCommit stashedIndex = stashedWorkTree.getParent(1);
 			walk.parseBody(stashedIndex);
 			walk.parseBody(stashedIndex.getTree());
 			walk.parseBody(stashedIndex.getParent(0));
 		}
 		List<DiffEntry> workTreeStashAgainstWorkTree = diffWorkingAgainstHead(stashedWorkTree);
 		assertEquals(1, workTreeStashAgainstWorkTree.size());
 		List<DiffEntry> workIndexAgainstWorkTree = diffIndexAgainstHead(stashedWorkTree);
 		assertEquals(1, workIndexAgainstWorkTree.size());
 		List<DiffEntry> indexStashAgainstWorkTree = diffIndexAgainstWorking(stashedWorkTree);
 		assertEquals(1, indexStashAgainstWorkTree.size());
 	}
 
 	@Test
 	public void indexDelete() throws Exception {
 		git.rm().addFilepattern("file.txt").call();
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertEquals(stashed.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, diffs.size());
 		assertEquals(DiffEntry.ChangeType.DELETE, diffs.get(0).getChangeType());
 		assertEquals("file.txt", diffs.get(0).getOldPath());
 	}
 
 	@Test
 	public void workingDirectoryModify() throws Exception {
 		writeTrashFile("file.txt", "content2");
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertEquals(head.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, diffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, diffs.get(0).getChangeType());
 		assertEquals("file.txt", diffs.get(0).getNewPath());
 	}
 
 	@Test
 	public void workingDirectoryModifyInSubfolder() throws Exception {
 		String path = "d1/d2/f.txt";
 		File subfolderFile = writeTrashFile(path, "content");
 		git.add().addFilepattern(path).call();
 		head = git.commit().setMessage("add file").call();
 
 		writeTrashFile(path, "content2");
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(subfolderFile));
 		validateStashedCommit(stashed);
 
 		assertEquals(head.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, diffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, diffs.get(0).getChangeType());
 		assertEquals(path, diffs.get(0).getNewPath());
 	}
 
 	@Test
 	public void workingDirectoryModifyIndexChanged() throws Exception {
 		writeTrashFile("file.txt", "content2");
 		git.add().addFilepattern("file.txt").call();
 		writeTrashFile("file.txt", "content3");
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertFalse(stashed.getTree().equals(stashed.getParent(1).getTree()));
 
 		List<DiffEntry> workingDiffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, workingDiffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, workingDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", workingDiffs.get(0).getNewPath());
 
 		List<DiffEntry> indexDiffs = diffIndexAgainstHead(stashed);
 		assertEquals(1, indexDiffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, indexDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", indexDiffs.get(0).getNewPath());
 
 		assertEquals(workingDiffs.get(0).getOldId(), indexDiffs.get(0)
 				.getOldId());
 		assertFalse(workingDiffs.get(0).getNewId()
 				.equals(indexDiffs.get(0).getNewId()));
 	}
 
 	@Test
 	public void workingDirectoryCleanIndexModify() throws Exception {
 		writeTrashFile("file.txt", "content2");
 		git.add().addFilepattern("file.txt").call();
 		writeTrashFile("file.txt", "content");
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertEquals(stashed.getParent(1).getTree(), stashed.getTree());
 
 		List<DiffEntry> workingDiffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, workingDiffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, workingDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", workingDiffs.get(0).getNewPath());
 
 		List<DiffEntry> indexDiffs = diffIndexAgainstHead(stashed);
 		assertEquals(1, indexDiffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, indexDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", indexDiffs.get(0).getNewPath());
 
 		assertEquals(workingDiffs.get(0).getOldId(), indexDiffs.get(0)
 				.getOldId());
 		assertTrue(workingDiffs.get(0).getNewId()
 				.equals(indexDiffs.get(0).getNewId()));
 	}
 
 	@Test
 	public void workingDirectoryDeleteIndexAdd() throws Exception {
 		String path = "file2.txt";
 		File added = writeTrashFile(path, "content2");
 		assertTrue(added.exists());
 		git.add().addFilepattern(path).call();
 		FileUtils.delete(added);
 		assertFalse(added.exists());
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertFalse(added.exists());
 
 		validateStashedCommit(stashed);
 
 		assertEquals(stashed.getParent(1).getTree(), stashed.getTree());
 
 		List<DiffEntry> workingDiffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, workingDiffs.size());
 		assertEquals(DiffEntry.ChangeType.ADD, workingDiffs.get(0)
 				.getChangeType());
 		assertEquals(path, workingDiffs.get(0).getNewPath());
 
 		List<DiffEntry> indexDiffs = diffIndexAgainstHead(stashed);
 		assertEquals(1, indexDiffs.size());
 		assertEquals(DiffEntry.ChangeType.ADD, indexDiffs.get(0)
 				.getChangeType());
 		assertEquals(path, indexDiffs.get(0).getNewPath());
 
 		assertEquals(workingDiffs.get(0).getOldId(), indexDiffs.get(0)
 				.getOldId());
 		assertTrue(workingDiffs.get(0).getNewId()
 				.equals(indexDiffs.get(0).getNewId()));
 	}
 
 	@Test
 	public void workingDirectoryDeleteIndexEdit() throws Exception {
 		File edited = writeTrashFile("file.txt", "content2");
 		git.add().addFilepattern("file.txt").call();
 		FileUtils.delete(edited);
 		assertFalse(edited.exists());
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		assertFalse(stashed.getTree().equals(stashed.getParent(1).getTree()));
 
 		List<DiffEntry> workingDiffs = diffWorkingAgainstHead(stashed);
 		assertEquals(1, workingDiffs.size());
 		assertEquals(DiffEntry.ChangeType.DELETE, workingDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", workingDiffs.get(0).getOldPath());
 
 		List<DiffEntry> indexDiffs = diffIndexAgainstHead(stashed);
 		assertEquals(1, indexDiffs.size());
 		assertEquals(DiffEntry.ChangeType.MODIFY, indexDiffs.get(0)
 				.getChangeType());
 		assertEquals("file.txt", indexDiffs.get(0).getNewPath());
 
 		assertEquals(workingDiffs.get(0).getOldId(), indexDiffs.get(0)
 				.getOldId());
 		assertFalse(workingDiffs.get(0).getNewId()
 				.equals(indexDiffs.get(0).getNewId()));
 	}
 
 	@Test
 	public void multipleEdits() throws Exception {
 		git.rm().addFilepattern("file.txt").call();
 		File addedFile = writeTrashFile("file2.txt", "content2");
 		git.add().addFilepattern("file2.txt").call();
 
 		RevCommit stashed = Git.wrap(db).stashCreate().call();
 		assertNotNull(stashed);
 		assertFalse(addedFile.exists());
 		validateStashedCommit(stashed);
 
 		assertEquals(stashed.getTree(), stashed.getParent(1).getTree());
 
 		List<DiffEntry> diffs = diffWorkingAgainstHead(stashed);
 		assertEquals(2, diffs.size());
 		assertEquals(DiffEntry.ChangeType.DELETE, diffs.get(0).getChangeType());
 		assertEquals("file.txt", diffs.get(0).getOldPath());
 		assertEquals(DiffEntry.ChangeType.ADD, diffs.get(1).getChangeType());
 		assertEquals("file2.txt", diffs.get(1).getNewPath());
 	}
 
 	@Test
 	public void refLogIncludesCommitMessage() throws Exception {
 		PersonIdent who = new PersonIdent("user", "user@email.com");
 		deleteTrashFile("file.txt");
 		RevCommit stashed = git.stashCreate().setPerson(who).call();
 		assertNotNull(stashed);
 		assertEquals("content", read(committedFile));
 		validateStashedCommit(stashed);
 
 		ReflogReader reader = git.getRepository().getReflogReader(
 				Constants.R_STASH);
 		ReflogEntry entry = reader.getLastEntry();
 		assertNotNull(entry);
 		assertEquals(ObjectId.zeroId(), entry.getOldId());
 		assertEquals(stashed, entry.getNewId());
 		assertEquals(who, entry.getWho());
 		assertEquals(stashed.getFullMessage(), entry.getComment());
 	}
 
 	@Test(expected = UnmergedPathsException.class)
 	public void unmergedPathsShouldCauseException() throws Exception {
 		commitFile("file.txt", "master", "base");
 		RevCommit side = commitFile("file.txt", "side", "side");
 		commitFile("file.txt", "master", "master");
 		git.merge().include(side).call();
 
 		git.stashCreate().call();
 	}
 
 	@Test
 	public void untrackedFileIncluded() throws Exception {
 		String trackedPath = "tracked.txt";
 		writeTrashFile(trackedPath, "content2");
 		git.add().addFilepattern(trackedPath).call();
 
 		RevCommit stashed = git.stashCreate()
 				.setIncludeUntracked(true).call();
 		validateStashedCommit(stashed, 3);
 
 		assertEquals(
 				"Expected commits for workingDir,stashedIndex and untrackedFiles.",
 				3, stashed.getParentCount());
 		assertFalse("untracked file should be deleted.", untrackedFile.exists());
 	}
 
 	@Test
 	public void untrackedFileNotIncluded() throws Exception {
 		String trackedPath = "tracked.txt";
 		// at least one modification needed
 		writeTrashFile(trackedPath, "content2");
 		git.add().addFilepattern(trackedPath).call();
 
 		RevCommit stashed = git.stashCreate().call();
 		validateStashedCommit(stashed);
 
 		assertTrue("untracked file should be left untouched.",
 				untrackedFile.exists());
 		assertEquals("content", read(untrackedFile));
 	}
 }