/*
 * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
 * Copyright (C) 2011, Matthias Sohn <matthias.sohn@sap.com>
 * 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.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
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.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.eclipse.jgit.api.CheckoutResult.Status;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.RefNotFoundException;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryTestCase;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.transport.RefSpec;
import org.eclipse.jgit.transport.RemoteConfig;
import org.eclipse.jgit.transport.URIish;
import org.eclipse.jgit.util.FileUtils;
import org.junit.Before;
import org.junit.Test;

public class CheckoutCommandTest extends RepositoryTestCase {
	private Git git;

	RevCommit initialCommit;

	RevCommit secondCommit;

	@Override
	@Before
	public void setUp() throws Exception {
		super.setUp();
		git = new Git(db);
		// commit something
		writeTrashFile("Test.txt", "Hello world");
		git.add().addFilepattern("Test.txt").call();
		initialCommit = git.commit().setMessage("Initial commit").call();

		// create a master branch and switch to it
		git.branchCreate().setName("test").call();
		RefUpdate rup = db.updateRef(Constants.HEAD);
		rup.link("refs/heads/test");

		// commit something on the test branch
		writeTrashFile("Test.txt", "Some change");
		git.add().addFilepattern("Test.txt").call();
		secondCommit = git.commit().setMessage("Second commit").call();
	}

	@Test
	public void testSimpleCheckout() throws Exception {
		git.checkout().setName("test").call();
	}

	@Test
	public void testCheckout() throws Exception {
		git.checkout().setName("test").call();
		assertEquals("[Test.txt, mode:100644, content:Some change]",
				indexState(CONTENT));
		Ref result = git.checkout().setName("master").call();
		assertEquals("[Test.txt, mode:100644, content:Hello world]",
				indexState(CONTENT));
		assertEquals("refs/heads/master", result.getName());
		assertEquals("refs/heads/master", git.getRepository().getFullBranch());
	}

	@Test
	public void testCreateBranchOnCheckout() throws Exception {
		git.checkout().setCreateBranch(true).setName("test2").call();
		assertNotNull(db.getRef("test2"));
	}

	@Test
	public void testCheckoutToNonExistingBranch() throws GitAPIException {
		try {
			git.checkout().setName("badbranch").call();
			fail("Should have failed");
		} catch (RefNotFoundException e) {
			// except to hit here
		}
	}

	@Test
	public void testCheckoutWithConflict() {
		CheckoutCommand co = git.checkout();
		try {
			writeTrashFile("Test.txt", "Another change");
			assertEquals(Status.NOT_TRIED, co.getResult().getStatus());
			co.setName("master").call();
			fail("Should have failed");
		} catch (Exception e) {
			assertEquals(Status.CONFLICTS, co.getResult().getStatus());
			assertTrue(co.getResult().getConflictList().contains("Test.txt"));
		}
	}

	@Test
	public void testCheckoutWithNonDeletedFiles() throws Exception {
		File testFile = writeTrashFile("temp", "");
		FileInputStream fis = new FileInputStream(testFile);
		try {
			FileUtils.delete(testFile);
			return;
		} catch (IOException e) {
			// the test makes only sense if deletion of
			// a file with open stream fails
		}
		fis.close();
		FileUtils.delete(testFile);
		CheckoutCommand co = git.checkout();
		// delete Test.txt in branch test
		testFile = new File(db.getWorkTree(), "Test.txt");
		assertTrue(testFile.exists());
		FileUtils.delete(testFile);
		assertFalse(testFile.exists());
		git.add().addFilepattern("Test.txt");
		git.commit().setMessage("Delete Test.txt").setAll(true).call();
		git.checkout().setName("master").call();
		assertTrue(testFile.exists());
		// lock the file so it can't be deleted (in Windows, that is)
		fis = new FileInputStream(testFile);
		try {
			assertEquals(Status.NOT_TRIED, co.getResult().getStatus());
			co.setName("test").call();
			assertTrue(testFile.exists());
			assertEquals(Status.NONDELETED, co.getResult().getStatus());
			assertTrue(co.getResult().getUndeletedList().contains("Test.txt"));
		} finally {
			fis.close();
		}
	}

	@Test
	public void testCheckoutCommit() throws Exception {
		Ref result = git.checkout().setName(initialCommit.name()).call();
		assertEquals("[Test.txt, mode:100644, content:Hello world]",
				indexState(CONTENT));
		assertNull(result);
		assertEquals(initialCommit.name(), git.getRepository().getFullBranch());
	}

	@Test
	public void testCheckoutRemoteTrackingWithoutLocalBranch() throws Exception {
		// create second repository
		Repository db2 = createWorkRepository();
		Git git2 = new Git(db2);

		// setup the second repository to fetch from the first repository
		final StoredConfig config = db2.getConfig();
		RemoteConfig remoteConfig = new RemoteConfig(config, "origin");
		URIish uri = new URIish(db.getDirectory().toURI().toURL());
		remoteConfig.addURI(uri);
		remoteConfig.update(config);
		config.save();

		// fetch from first repository
		RefSpec spec = new RefSpec("+refs/heads/*:refs/remotes/origin/*");
		git2.fetch().setRemote("origin").setRefSpecs(spec).call();
		// checkout remote tracking branch in second repository
		// (no local branches exist yet in second repository)
		git2.checkout().setName("remotes/origin/test").call();
		assertEquals("[Test.txt, mode:100644, content:Some change]",
				indexState(db2, CONTENT));
	}

	@Test
	public void testCheckoutOfFileWithInexistentParentDir() throws Exception {
		File a = writeTrashFile("dir/a.txt", "A");
		writeTrashFile("dir/b.txt", "A");
		git.add().addFilepattern("dir/a.txt").addFilepattern("dir/b.txt")
				.call();
		git.commit().setMessage("Added dir").call();

		File dir = new File(db.getWorkTree(), "dir");
		FileUtils.delete(dir, FileUtils.RECURSIVE);

		git.checkout().addPath("dir/a.txt").call();
		assertTrue(a.exists());
	}

	@Test
	public void testCheckoutOfDirectoryShouldBeRecursive() throws Exception {
		File a = writeTrashFile("dir/a.txt", "A");
		File b = writeTrashFile("dir/sub/b.txt", "B");
		git.add().addFilepattern("dir").call();
		git.commit().setMessage("Added dir").call();

		write(a, "modified");
		write(b, "modified");
		git.checkout().addPath("dir").call();

		assertThat(read(a), is("A"));
		assertThat(read(b), is("B"));
	}

	@Test
	public void testCheckoutAllPaths() throws Exception {
		File a = writeTrashFile("dir/a.txt", "A");
		File b = writeTrashFile("dir/sub/b.txt", "B");
		git.add().addFilepattern("dir").call();
		git.commit().setMessage("Added dir").call();

		write(a, "modified");
		write(b, "modified");
		git.checkout().setAllPaths(true).call();

		assertThat(read(a), is("A"));
		assertThat(read(b), is("B"));
	}

	@Test
	public void testCheckoutWithStartPoint() throws Exception {
		File a = writeTrashFile("a.txt", "A");
		git.add().addFilepattern("a.txt").call();
		RevCommit first = git.commit().setMessage("Added a").call();

		write(a, "other");
		git.commit().setAll(true).setMessage("Other").call();

		git.checkout().setCreateBranch(true).setName("a")
				.setStartPoint(first.getId().getName()).call();

		assertThat(read(a), is("A"));
	}

	@Test
	public void testCheckoutWithStartPointOnlyCertainFiles() throws Exception {
		File a = writeTrashFile("a.txt", "A");
		File b = writeTrashFile("b.txt", "B");
		git.add().addFilepattern("a.txt").addFilepattern("b.txt").call();
		RevCommit first = git.commit().setMessage("First").call();

		write(a, "other");
		write(b, "other");
		git.commit().setAll(true).setMessage("Other").call();

		git.checkout().setCreateBranch(true).setName("a")
				.setStartPoint(first.getId().getName()).addPath("a.txt").call();

		assertThat(read(a), is("A"));
		assertThat(read(b), is("other"));
	}

	@Test
	public void testDetachedHeadOnCheckout() throws JGitInternalException,
			IOException, GitAPIException {
		CheckoutCommand co = git.checkout();
		co.setName("master").call();

		String commitId = db.getRef(Constants.MASTER).getObjectId().name();
		co = git.checkout();
		co.setName(commitId).call();

		Ref head = db.getRef(Constants.HEAD);
		assertFalse(head.isSymbolic());
		assertSame(head, head.getTarget());
	}

	@Test
	public void testUpdateSmudgedEntries() throws Exception {
		git.branchCreate().setName("test2").call();
		RefUpdate rup = db.updateRef(Constants.HEAD);
		rup.link("refs/heads/test2");

		File file = new File(db.getWorkTree(), "Test.txt");
		long size = file.length();
		long mTime = file.lastModified() - 5000L;
		assertTrue(file.setLastModified(mTime));

		DirCache cache = DirCache.lock(db.getIndexFile(), db.getFS());
		DirCacheEntry entry = cache.getEntry("Test.txt");
		assertNotNull(entry);
		entry.setLength(0);
		entry.setLastModified(0);
		cache.write();
		assertTrue(cache.commit());

		cache = DirCache.read(db.getIndexFile(), db.getFS());
		entry = cache.getEntry("Test.txt");
		assertNotNull(entry);
		assertEquals(0, entry.getLength());
		assertEquals(0, entry.getLastModified());

		db.getIndexFile().setLastModified(
				db.getIndexFile().lastModified() - 5000);

		assertNotNull(git.checkout().setName("test").call());

		cache = DirCache.read(db.getIndexFile(), db.getFS());
		entry = cache.getEntry("Test.txt");
		assertNotNull(entry);
		assertEquals(size, entry.getLength());
		assertEquals(mTime, entry.getLastModified());
	}
}