/*
 * Copyright (C) 2014 Red Hat, inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
package org.jboss.as.repository;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.core.IsNull.notNullValue;
import static org.jboss.as.repository.HashUtil.emptyStream;
import static org.jboss.as.repository.PathUtil.deleteRecursively;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.FileTime;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.hamcrest.CoreMatchers;
import org.jboss.as.protocol.StreamUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 *
 * @author Emmanuel Hugonnet (c) 2016 Red Hat, inc.
 */
public class ContentRepositoryTest {

    private static final boolean IS_WINDOWS = AccessController.doPrivileged((PrivilegedAction<Boolean>) ()
            -> System.getProperty("os.name", null).toLowerCase(Locale.ENGLISH).contains("windows"));
    private static final FileTime time = FileTime.from(Instant.parse("2007-12-03T10:15:30.00Z"));

    private ContentRepository repository;
    private final File rootDir = new File("target", "repository");
    private final File tmpRootDir = new File("target", "tmp");

    public ContentRepositoryTest() {
    }

    @Before
    public void createRepository() throws IOException {
        if (rootDir.exists()) {
            deleteRecursively(rootDir.toPath());
        }
        rootDir.mkdirs();
        if (tmpRootDir.exists()) {
            deleteRecursively(tmpRootDir.toPath());
        }
        tmpRootDir.mkdirs();
        repository = ContentRepository.Factory.create(rootDir, tmpRootDir, 0L);
        repository.readWrite();
    }

    @After
    public void destroyRepository() throws IOException {
        deleteRecursively(rootDir.toPath());
        deleteRecursively(tmpRootDir.toPath());
        repository = null;
    }

    private String readFileContent(Path path) throws Exception {
        try (InputStream in = getFileInputStream(path)) {
            return readFileContent(in);
        }
    }

    private String readFileContent(InputStream in) throws Exception {
        try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buffer = new byte[8];
            int length = 8;
            while ((length = in.read(buffer, 0, length)) > 0) {
                out.write(buffer, 0, length);
            }
            return out.toString("UTF-8");
        }
    }

    /**
     * Test of addContent method, of class ContentRepository.
     */
    @Test
    public void testAddContent() throws Exception {
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
            byte[] result = repository.addContent(stream);
            assertThat(result, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(result), is(expResult));
        }
    }

    /**
     * Test of explodeContent method, of class ContentRepository.
     */
    @Test
    public void testExplodeContent() throws Exception {
        byte[] archive = createArchive(Collections.singletonList("overlay.xhtml"));
        try (ByteArrayInputStream stream = new ByteArrayInputStream(archive)) {
            byte[] hash = repository.explodeContent(repository.addContent(stream));
            String expResult = "b1f18e286615dda0643633ec31f1a17d90e48875";
            //hash is different from the simple overlay.xhtml as we add the content folder name in the computation
            assertThat(hash, is(notNullValue()));
            Path content = repository.getContent(hash).getPhysicalFile().toPath();
            String contentHtml = readFileContent(content.resolve("overlay.xhtml"));
            String expectedContentHtml = readFileContent(getResourceAsStream("overlay.xhtml"));
            assertThat(contentHtml, is(expectedContentHtml));
            assertThat(HashUtil.bytesToHexString(hash), is(expResult));
        }
    }

    /**
     * Test of explodeContent method, of class ContentRepository.
     */
    @Test
    public void testExplodeSubContent() throws Exception {
        byte[] archive = createMultiLevelArchive(Collections.singletonList("overlay.xhtml"), "test/archive.zip");
        try (ByteArrayInputStream stream = new ByteArrayInputStream(archive)) {
            byte[] originalHash = repository.addContent(stream);
            assertThat(originalHash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(originalHash), is("f11be1883895957b06f7e46d784cad60dd015d71"));
            try {
                repository.explodeSubContent(originalHash, "test/archive.zip");
                fail("Shouldn't be able to explode sub content of unexploded content");
            } catch (ExplodedContentException ex) {
            }
            byte[] hash = repository.explodeContent(originalHash);
            //hash is different from the simple overlay.xhtml as we add the content folder name in the computation
            assertThat(hash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(hash), is("5ab326c763fadad903d0e9bbfecbb42e69a1b8b4"));
            Path content = repository.getContent(hash).getPhysicalFile().toPath();
            String contentHtml = readFileContent(content.resolve("overlay.xhtml"));
            String expectedContentHtml = readFileContent(getResourceAsStream("overlay.xhtml"));
            assertThat(contentHtml, is(expectedContentHtml));
            Path archiveFile = content.resolve("test").resolve("archive.zip");
            assertTrue(Files.exists(archiveFile));
            assertTrue(PathUtil.isArchive(archiveFile));
            byte[] fullyExplodedHash = repository.explodeSubContent(hash, "test/archive.zip");
            assertThat(fullyExplodedHash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(fullyExplodedHash), is("231f4d042711f017d7f8c45aa4affcccbd4d67f4"));
            content = repository.getContent(repository.explodeSubContent(hash, "test/archive.zip")).getPhysicalFile().toPath();
            Path directory = content.resolve("test").resolve("archive.zip");
            assertTrue("Should not be a zip file", Files.isDirectory(directory));
            assertThat(contentHtml, is(expectedContentHtml));
        }
    }

    private byte[] createMultiLevelArchive(List<String> resources, String archivePath) throws IOException {
        try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
            try (ZipOutputStream out = new ZipOutputStream(buffer)) {
                for (String resourcePath : resources) {
                    ZipEntry entry = new ZipEntry(resourcePath);
                    entry.setLastModifiedTime(time);
                    out.putNextEntry(entry);
                    try (InputStream in = getResourceAsStream(resourcePath)) {
                        StreamUtils.copyStream(in, out);
                    }
                    out.closeEntry();
                }
                ZipEntry entry = new ZipEntry("test/");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                out.closeEntry();
                entry = new ZipEntry(archivePath);
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                try (InputStream in = new ByteArrayInputStream(createArchive(resources))) {
                    StreamUtils.copyStream(in, out);
                }
                out.closeEntry();
            }
            return buffer.toByteArray();
        }
    }

    private byte[] createArchive(List<String> resources) throws IOException {
        try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
            try (ZipOutputStream out = new ZipOutputStream(buffer)) {
                for (String resourcePath : resources) {
                    ZipEntry entry = new ZipEntry(resourcePath);
                    entry.setLastModifiedTime(time);
                    out.putNextEntry(entry);
                    try (InputStream in = getResourceAsStream(resourcePath)) {
                        StreamUtils.copyStream(in, out);
                    }
                    out.closeEntry();
                }
            }
            return buffer.toByteArray();
        }
    }

    private byte[] createContentArchive() throws IOException {
        try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
            try (ZipOutputStream out = new ZipOutputStream(buffer)) {
                ZipEntry entry = new ZipEntry("overlay.xhtml");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                try (InputStream in = getResourceAsStream("overlay.xhtml")) {
                    StreamUtils.copyStream(in, out);
                }
                out.closeEntry();
                entry = new ZipEntry("test.jsp");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                try (InputStream in = new ByteArrayInputStream("this is a test".getBytes(StandardCharsets.UTF_8))) {
                    StreamUtils.copyStream(in, out);
                }
                out.closeEntry();
                entry = new ZipEntry("empty-dir/");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                out.closeEntry();
                assertTrue(entry.isDirectory());
                entry = new ZipEntry("test/");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                out.closeEntry();
                assertTrue(entry.isDirectory());
                entry = new ZipEntry("test/empty-file.txt");
                entry.setLastModifiedTime(time);
                out.putNextEntry(entry);
                try (InputStream in = HashUtil.emptyStream()) {
                    StreamUtils.copyStream(in, out);
                }
                out.closeEntry();
            }
            return buffer.toByteArray();
        }
    }

    /**
     * Test of explodeContent method, of class ContentRepository.
     */
    @Test
    public void testChangeExplodedContent() throws Exception {
        byte[] archive = createArchive(Collections.singletonList("overlay.xhtml"));
        try (ByteArrayInputStream stream = new ByteArrayInputStream(archive)) {
            byte[] hash = repository.explodeContent(repository.addContent(stream));
            String expResult = "b1f18e286615dda0643633ec31f1a17d90e48875";
            //hash is different from the simple overlay.xhtml as we add the content folder name in the computation
            assertThat(hash, is(notNullValue()));
            Path content = repository.getContent(hash).getPhysicalFile().toPath();
            String contentHtml = readFileContent(content.resolve("overlay.xhtml"));
            String expectedContentHtml = readFileContent(getResourceAsStream("overlay.xhtml"));
            assertThat(contentHtml, is(expectedContentHtml));
            assertThat(HashUtil.bytesToHexString(hash), is(expResult));
            String updatedExpectedResult = "161a2c95b16d5ffede0721c2cec984ca51009082";
            hash = repository.addContentToExploded(hash,
                    Collections.singletonList(new ExplodedContent("test.jsp",
                            new ByteArrayInputStream("this is a test".getBytes(StandardCharsets.UTF_8)))),
                    true);
            assertThat(hash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(hash), is(updatedExpectedResult));
            try (InputStream addedContent = repository.readContent(hash, "test.jsp")) {
                assertThat(addedContent, is(notNullValue()));
                assertThat(readFileContent(addedContent), is("this is a test"));
            }
            content = repository.getContent(hash).getPhysicalFile().toPath();
            assertThat(content.toFile().list().length, is(2));
            hash = repository.removeContentFromExploded(hash, Collections.singletonList("test.jsp"));
            assertThat(hash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(hash), is(expResult));
            updatedExpectedResult = "a44921155d75009d885db3357005b85b435cf59f";
            hash = repository.addContentToExploded(hash,
                    Collections.singletonList(new ExplodedContent("test.jsp",
                            new ByteArrayInputStream("this is an overwrite test".getBytes(StandardCharsets.UTF_8)))),
                    true);
            assertThat(hash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(hash), is(updatedExpectedResult));
            try (InputStream addedContent = repository.readContent(hash, "test.jsp")) {
                assertThat(addedContent, is(notNullValue()));
                assertThat(readFileContent(addedContent), is("this is an overwrite test"));
            }
            try {
                hash = repository.addContentToExploded(hash,
                        Collections.singletonList(new ExplodedContent("test.jsp",
                                new ByteArrayInputStream("this is a failure test".getBytes(StandardCharsets.UTF_8)))),
                        false);
                fail("Overwritting shouldn't work");
            } catch (ExplodedContentException ex) {
            }
        }
    }

    @Test
    public void testListContents() throws Exception {
        byte[] archive = createArchive(Collections.singletonList("overlay.xhtml"));
        try (ByteArrayInputStream stream = new ByteArrayInputStream(archive)) {
            byte[] hash = repository.explodeContent(repository.addContent(stream));
            String expResult = "b1f18e286615dda0643633ec31f1a17d90e48875";
            //hash is different from the simple overlay.xhtml as we add the content folder name in the computation
            assertThat(hash, is(notNullValue()));
            Path content = repository.getContent(hash).getPhysicalFile().toPath();
            String contentHtml = readFileContent(content.resolve("overlay.xhtml"));
            String expectedContentHtml = readFileContent(getResourceAsStream("overlay.xhtml"));
            assertThat(contentHtml, is(expectedContentHtml));
            assertThat(HashUtil.bytesToHexString(hash), is(expResult));
            String updatedExpectedResult = "161a2c95b16d5ffede0721c2cec984ca51009082";
            hash = repository.addContentToExploded(hash,
                    Collections.singletonList(new ExplodedContent("test.jsp", new ByteArrayInputStream("this is a test".getBytes(StandardCharsets.UTF_8)))),
                    true);
            assertThat(hash, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(hash), is(updatedExpectedResult));
            List<String> contents = new ArrayList<>();
            for (ContentRepositoryElement element : repository.listContent(hash, "", ContentFilter.Factory.createContentFilter(- 1, false))) {
                String repositoryElement1Path = element.getPath();
                contents.add(repositoryElement1Path);
            }
            assertThat(contents.size(), is(2));
            assertThat(contents, CoreMatchers.hasItems("test.jsp", "overlay.xhtml"));
            hash = repository.addContentToExploded(hash, Collections.singletonList(new ExplodedContent("test/empty-file.txt", emptyStream())), true);
            hash = repository.addContentToExploded(hash, Collections.singletonList(new ExplodedContent("empty-dir", null)), true);
            List<String> result = new ArrayList<>();
            for (ContentRepositoryElement repositoryElement : repository.listContent(hash, "", ContentFilter.Factory.createContentFilter(- 1, false))) {
                String contentRepositoryElement1Path = repositoryElement.getPath();
                result.add(contentRepositoryElement1Path);
            }
            contents = result;
            assertThat(contents, is(notNullValue()));
            assertThat(contents.size(), is(5));
            assertThat(contents, CoreMatchers.hasItems("test.jsp", "overlay.xhtml", "test/empty-file.txt", "test/", "empty-dir/"));
            hash = repository.removeContentFromExploded(hash, Collections.singletonList("test.jsp"));
            List<String> list = new ArrayList<>();
            for (ContentRepositoryElement contentRepositoryElement : repository.listContent(hash, "", ContentFilter.Factory.createFileFilter(- 1, false))) {
                String path = contentRepositoryElement.getPath();
                list.add(path);
            }
            contents = list;
            assertThat(contents, is(notNullValue()));
            assertThat(contents.size(), is(2));
            assertThat(contents, CoreMatchers.hasItems("overlay.xhtml", "test/empty-file.txt"));
        }
    }

    @Test
    public void testListArchiveContents() throws Exception {
        byte[] archive = createContentArchive();
        try (ByteArrayInputStream stream = new ByteArrayInputStream(archive)) {
            byte[] hash = repository.addContent(stream);
            //hash is different from the simple overlay.xhtml as we add the content folder name in the computation
            assertThat(hash, is(notNullValue()));
            List<String> contents = new ArrayList<>();
            for (ContentRepositoryElement element : repository.listContent(hash, "", ContentFilter.Factory.createContentFilter(- 1, false))) {
                String repositoryElement1Path = element.getPath();
                contents.add(repositoryElement1Path);
            }
            assertThat(contents.size(), is(5));
            assertThat(contents, CoreMatchers.hasItems("test.jsp", "overlay.xhtml", "test/empty-file.txt", "test/", "empty-dir/"));
            hash = repository.addContentToExploded(hash, Collections.singletonList(new ExplodedContent("test/empty-file.txt", emptyStream())), true);
            hash = repository.addContentToExploded(hash, Collections.singletonList(new ExplodedContent("empty-dir", null)), true);
            List<String> result = new ArrayList<>();
            for (ContentRepositoryElement repositoryElement : repository.listContent(hash, "", ContentFilter.Factory.createContentFilter(1, false))) {
                String contentRepositoryElement1Path = repositoryElement.getPath();
                result.add(contentRepositoryElement1Path);
            }
            contents = result;
            assertThat(contents, is(notNullValue()));
            assertThat(contents.size(), is(4));
            assertThat(contents, CoreMatchers.hasItems("test.jsp", "overlay.xhtml", "test/", "empty-dir/"));
            List<String> list = new ArrayList<>();
            for (ContentRepositoryElement contentRepositoryElement : repository.listContent(hash, "", ContentFilter.Factory.createFileFilter(- 1, false))) {
                String path = contentRepositoryElement.getPath();
                list.add(path);
            }
            contents = list;
            assertThat(contents, is(notNullValue()));
            assertThat(contents.size(), is(3));
            assertThat(contents, CoreMatchers.hasItems("test.jsp", "overlay.xhtml", "test/empty-file.txt"));
        }
    }

    /**
     * Test of addContentReference method, of class ContentRepository.
     */
    @Test
    public void testAddContentReference() throws Exception {
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
            byte[] result = repository.addContent(stream);
            assertThat(result, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(result), is(expResult));
            ContentReference reference = new ContentReference("contentReferenceIdentifier", result);
            repository.addContentReference(reference);
        }
    }

    /**
     * Test of getContent method, of class ContentRepository.
     */
    @Test
    public void testGetContent() throws Exception {
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
            byte[] result = repository.addContent(stream);
            assertThat(result, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(result), is(expResult));
            Path content = repository.getContent(result).getPhysicalFile().toPath();
            String contentHtml = readFileContent(content);
            String expectedContentHtml = readFileContent(getResourceAsStream("overlay.xhtml"));
            assertThat(contentHtml, is(expectedContentHtml));
        }
    }

    /**
     * Test of hasContent method, of class ContentRepository.
     */
    @Test
    public void testHasContent() throws Exception {
        String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(false));
            byte[] result = repository.addContent(stream);
            assertThat(result, is(notNullValue()));
            assertThat(HashUtil.bytesToHexString(result), is(expResult));
            assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(true));
        }
    }

    /**
     * Test of removeContent method, of class ContentRepository.
     */
    @Test
    public void testRemoveContent() throws Exception {
        String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
        Path grandparent = rootDir.toPath().resolve("0c");
        Path parent = grandparent.resolve("40ffacd15b0f66d5081a93407d3ff5e3c65a71");
        Path expectedContent = parent.resolve("content");
        assertFalse(expectedContent + " shouldn't exist", Files.exists(expectedContent));
        assertFalse(expectedContent.getParent() + " shouldn't exist", Files.exists(parent));
        assertFalse(expectedContent.getParent().getParent() + " shouldn't exist", Files.exists(grandparent));
        byte[] result;
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(false));
            result = repository.addContent(stream);
        }
        assertThat(result, is(notNullValue()));
        assertThat(HashUtil.bytesToHexString(result), is(expResult));
        assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(true));
        assertTrue(expectedContent + " should have been created", Files.exists(expectedContent));
        assertTrue(parent + " should have been created", Files.exists(parent));
        assertTrue(grandparent + " should have been created", Files.exists(grandparent));
        repository.removeContent(new ContentReference("overlay.xhtml", expResult));
        assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(false));
        assertFalse(expectedContent + " should have been deleted", Files.exists(expectedContent));
        assertFalse(parent.toAbsolutePath() + " should have been deleted", Files.exists(parent));
        assertFalse(grandparent + " should have been deleted", Files.exists(grandparent));
        Path content = repository.getContent(result).getPhysicalFile().toPath();
        assertFalse(Files.exists(content));
    }

    /**
     * Test that an empty dir will be removed during cleaning.
     */
    @Test
    public void testCleanEmptyParentDir() throws Exception {
        File emptyGrandParent = new File(rootDir, "ae");
        emptyGrandParent.mkdir();
        File emptyParent = new File(emptyGrandParent, "ffacd15b0f66d5081a93407d3ff5e3c65a71");
        emptyParent.mkdir();
        assertThat(emptyGrandParent.exists(), is(true));
        assertThat(emptyParent.exists(), is(true));
        Map<String, Set<String>> result = repository.cleanObsoleteContent(); //To mark content for deletion
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).contains(emptyParent.getAbsolutePath()), is(true));
        Thread.sleep(10);
        result = repository.cleanObsoleteContent();
        assertThat(emptyGrandParent.exists(), is(false));
        assertThat(emptyParent.exists(), is(false));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).contains(emptyParent.getAbsolutePath()), is(true));
    }

    /**
     * Test that an empty dir will be removed during cleaning.
     */
    @Test
    public void testCleanEmptyGrandParentDir() throws Exception {
        File emptyGrandParent = new File(rootDir, "ae");
        emptyGrandParent.mkdir();
        assertThat(emptyGrandParent.exists(), is(true));
        Map<String, Set<String>> result = repository.cleanObsoleteContent(); //Mark content for deletion
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).contains(emptyGrandParent.getAbsolutePath()), is(true));
        Thread.sleep(10);
        result = repository.cleanObsoleteContent();
        assertThat(emptyGrandParent.exists(), is(false));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).contains(emptyGrandParent.getAbsolutePath()), is(true));
    }

    /**
     * Test that an empty dir with a system metadata file .DS_Store will be removed during cleaning.
     */
    @Test
    public void testCleanEmptyParentDirWithSystemMetaDataFile() throws Exception {
        File emptyGrandParent = new File(rootDir, "ae");
        emptyGrandParent.mkdir();
        File metaDataFile = new File(emptyGrandParent, ".DS_Store");
        metaDataFile.createNewFile();
        assertThat(emptyGrandParent.exists(), is(true));
        assertThat(metaDataFile.exists(), is(true));
        Map<String, Set<String>> result = repository.cleanObsoleteContent(); // To mark content for deletion
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).contains(metaDataFile.getAbsolutePath()), is(true));
        Thread.sleep(10);
        result = repository.cleanObsoleteContent();
        assertThat(emptyGrandParent.exists(), is(false));
        assertThat(metaDataFile.exists(), is(false));
        assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(0));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(1));
        assertThat(result.get(ContentRepository.DELETED_CONTENT).contains(metaDataFile.getAbsolutePath()), is(true));
    }

    /**
     * Test that an empty dir will be removed during cleaning.
     */
    @Test
    public void testCleanNotEmptyGrandParentDir() throws Exception {
        String expResult = "0c40ffacd15b0f66d5081a93407d3ff5e3c65a71";
        Path grandparent = rootDir.toPath().resolve("0c");
        Path parent = grandparent.resolve("40ffacd15b0f66d5081a93407d3ff5e3c65a71");
        Path other = grandparent.resolve("40ffacd15b0f66d5081a93407d3ff5e3c65a81");
        Files.createDirectories(other);
        Path expectedContent = parent.resolve("content");
        assertFalse(expectedContent + " shouldn't exist", Files.exists(expectedContent));
        assertFalse(parent + " shouldn't exist", Files.exists(parent));
        byte[] result;
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(false));
            result = repository.addContent(stream);
        }
        assertThat(result, is(notNullValue()));
        assertThat(HashUtil.bytesToHexString(result), is(expResult));
        assertThat(repository.hasContent(HashUtil.hexStringToByteArray(expResult)), is(true));
        assertTrue(expectedContent + " should have been created", Files.exists(expectedContent));
        assertTrue(parent + " should have been created", Files.exists(parent));
        repository.removeContent(new ContentReference("overlay.xhtml", expResult));
        assertFalse(repository.hasContent(HashUtil.hexStringToByteArray(expResult)));
        assertFalse(expectedContent + " should have been deleted", Files.exists(expectedContent));
        assertFalse(parent.toAbsolutePath() + " should have been deleted", Files.exists(parent));
        assertTrue(other + " should not have been deleted", Files.exists(other));
        assertTrue(grandparent + " should not have been deleted", Files.exists(grandparent));
        Path content = repository.getContent(result).getPhysicalFile().toPath();
        assertFalse(Files.exists(content));
    }

    /**
     * Test that an dir not empty with no content will not be removed during cleaning.
     */
    @Test
    public void testNotEmptyDir() throws Exception {
        Path parentDir = rootDir.toPath().resolve("ae").resolve("ffacd15b0f66d5081a93407d3ff5e3c65a71");
        Path overlay = parentDir.resolve("overlay.xhtml");
        Path content = parentDir.resolve("content");
        Files.createDirectories(overlay.getParent());
        try (InputStream stream = getResourceAsStream("overlay.xhtml")) {
            Files.copy(stream, overlay);
            Files.copy(overlay, content);
            assertThat(Files.exists(content), is(true));
            assertThat(Files.exists(overlay), is(true));
            Map<String, Set<String>> result = repository.cleanObsoleteContent(); //Mark content for deletion
            assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(1));
            assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(0));
            assertThat(result.get(ContentRepository.MARKED_CONTENT).contains(parentDir.toFile().getAbsolutePath()), is(true));
            Thread.sleep(10);
            result = repository.cleanObsoleteContent();
            assertThat(Files.exists(content), is(false));
            assertThat(Files.exists(overlay), is(true));
            assertThat(result.get(ContentRepository.MARKED_CONTENT).size(), is(0));
            assertThat(result.get(ContentRepository.DELETED_CONTENT).size(), is(1));
            assertThat(result.get(ContentRepository.DELETED_CONTENT).contains(parentDir.toFile().getAbsolutePath()), is(true));
        } finally {
            Files.deleteIfExists(overlay);
            Files.deleteIfExists(overlay.getParent());
            Files.deleteIfExists(overlay.getParent().getParent());
        }

    }

    private InputStream getResourceAsStream(final String name) throws IOException {
        final InputStream result = getClass().getClassLoader().getResourceAsStream(name);
        // If we're on Windows we want to replace the stream with one that ignores \r
        if (result != null && IS_WINDOWS) {
            return new CarriageReturnRemovalInputStream(result);
        }
        return result;
    }

    private InputStream getFileInputStream(final File file) throws IOException {
        if (IS_WINDOWS) {
            return new CarriageReturnRemovalInputStream(new FileInputStream(file));
        }
        return new FileInputStream(file);
    }

    private InputStream getFileInputStream(final Path path) throws IOException {
        if (IS_WINDOWS) {
            return new CarriageReturnRemovalInputStream(Files.newInputStream(path));
        }
        return Files.newInputStream(path);
    }

    private static class CarriageReturnRemovalInputStream extends InputStream {

        private final InputStream delegate;

        private CarriageReturnRemovalInputStream(final InputStream delegate) {
            this.delegate = delegate;
        }

        @Override
        public int read() throws IOException {
            int result = delegate.read();
            if (result == '\r') {
                result = delegate.read();
            }
            return result;
        }

        @Override
        public int read(final byte[] b) throws IOException {
            Objects.nonNull(b);
            int result = 0;
            while (result > -1 && result < b.length) {
                int c = read();
                if (c == -1) {
                    return result == 0 ? -1 : result;
                }
                b[result++] = (byte) c;
            }
            return result;
        }

        @Override
        public int read(final byte[] b, final int off, final int len) throws IOException {
            Objects.nonNull(b);
            if (off < 0 || len < 0 || len > b.length - off) {
                throw new IndexOutOfBoundsException();
            } else if (len == 0) {
                return 0;
            }
            int result = 0;
            while (result > -1 && result < len) {
                int c = read();
                if (c == -1) {
                    return result == 0 ? -1 : result;
                }
                b[off + result++] = (byte) c;
            }
            return result;
        }

        @Override
        public long skip(final long n) throws IOException {
            return delegate.skip(n);
        }

        @Override
        public int available() throws IOException {
            return delegate.available();
        }

        @Override
        public void close() throws IOException {
            delegate.close();
        }

        @Override
        public void mark(final int readlimit) {
            delegate.mark(readlimit);
        }

        @Override
        public void reset() throws IOException {
            delegate.reset();
        }

        @Override
        public boolean markSupported() {
            return delegate.markSupported();
        }
    }
}
