/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.scm;

import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import org.apache.commons.lang3.StringUtils;
import org.apache.maven.scm.command.add.AddScmResult;
import org.apache.maven.scm.command.checkin.CheckInScmResult;
import org.apache.maven.scm.command.checkout.CheckOutScmResult;
import org.apache.maven.scm.command.edit.EditScmResult;
import org.apache.maven.scm.command.remove.RemoveScmResult;
import org.apache.maven.scm.provider.ScmProvider;
import org.apache.maven.scm.repository.ScmRepository;
import org.junit.After;
import org.junit.Before;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

/**
 * Base class for all TcK tests.
 * <p>
 * Basically all it does is to setup a default test enviroment
 * common for all tck tests. The default setup includes:
 * <ol>
 * <li>Delete all default locations (working copy, updating copy etc)</li>
 * <li>Initialize the repository</li>
 * <li>Check out the repository to the working copy</li>
 * </ol>
 *
 * @author <a href="mailto:torbjorn@smorgrav.org">Torbj�rn Eikli Sm�rgrav</a>
 *
 */
public abstract class ScmTckTestCase extends ScmTestCase {
    private ScmRepository scmRepository;

    private List<String> scmFileNames;

    /**
     * Some tests can only run if the appropriate application has been installed.
     * If the provided name is not a runnable application all tests in the class are skipped.
     * @return The commandline command for the specific scm provider. Or null if none is needed.
     */
    public String getScmProviderCommand() {
        return null;
    }

    /**
     * @return A provider specific and valid url for the repository
     * @throws Exception if any
     */
    public abstract String getScmUrl() throws Exception;

    /**
     * <p>
     * Get the list of file names that is supposed to be in the test repo.
     * </p>
     * <ul>
     * <li>/pom.xml</li>
     * <li>/readme.txt</li>
     * <li>/src/main/java/Application.java</li>
     * <li>/src/test/java/Test.java</li>
     * </ul>
     *
     * @return {@link List} of {@link String} objects
     */
    protected List<String> getScmFileNames() {
        return scmFileNames;
    }

    /**
     * <p>
     * Initialize repository at the {@link #getScmUrl()} location with the files in {@link #getScmFileNames()}
     * </p>
     * <p>
     * The setup is also asserting on the existence of these files. <br>
     * This should only be used by this class (thus do not call this method from derived classes)
     * </p>
     * <b>Note</b>: 'svnadmin' should be a system command.
     *
     * @throws Exception if any
     */
    public abstract void initRepo() throws Exception;

    public void checkScmPresence() {
        String scmProviderCommand = getScmProviderCommand();
        if (scmProviderCommand != null) {
            assumeTrue(
                    "Skipping tests because the required command '" + scmProviderCommand + "' is not available.",
                    ScmTestCase.isSystemCmd(scmProviderCommand));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Before
    @Override
    public void setUp() throws Exception {
        checkScmPresence();
        super.setUp();

        scmRepository = null;

        scmFileNames = new ArrayList<>(4);
        scmFileNames.add("/pom.xml");
        scmFileNames.add("/readme.txt");
        scmFileNames.add("/src/main/java/Application.java");
        scmFileNames.add("/src/test/java/Test.java");

        initRepo();

        checkOut(getWorkingCopy(), getScmRepository());

        Iterator<String> it = getScmFileNames().iterator();
        while (it.hasNext()) {
            assertFile(getWorkingCopy(), it.next());
        }
    }

    /**
     * This method is available to those SCM clients that need to perform
     * a cleanup at the end of the tests. It is needed when server side
     * operations are performed, or the check out dirs are outside
     * of the normal target directory.
     */
    public void removeRepo() throws Exception {}

    /**
     * Provided to allow removeRepo() to be called.
     */
    @After
    @Override
    public void tearDown() throws Exception {
        super.tearDown();
        removeRepo();
    }

    /**
     * Convenience method to get the ScmRepository for this provider
     */
    protected ScmRepository getScmRepository() throws Exception {
        if (scmRepository == null) {
            scmRepository = getScmManager().makeScmRepository(getScmUrl());
        }

        return scmRepository;
    }

    /**
     * Convenience method to check out files from the repository
     */
    protected CheckOutScmResult checkOut(File workingDirectory, ScmRepository repository) throws Exception {
        CheckOutScmResult result = getScmManager()
                .getProviderByUrl(getScmUrl())
                .checkOut(repository, new ScmFileSet(workingDirectory), (ScmVersion) null);

        assertTrue("Check result was successful, output: " + result.getCommandOutput(), result.isSuccess());

        return result;
    }

    /**
     * Convenience method to check in files to the repository
     */
    protected CheckInScmResult checkIn(File workingDirectory, ScmRepository repository) throws Exception {
        CheckInScmResult result = getScmManager()
                .getProviderByUrl(getScmUrl())
                .checkIn(repository, new ScmFileSet(workingDirectory), (ScmVersion) null, "Initial Checkin");

        assertTrue("Check result was successful, output: " + result.getCommandOutput(), result.isSuccess());

        return result;
    }

    /**
     * Convenience method to remove files from the repository
     */
    protected RemoveScmResult remove(File workingDirectory, ScmRepository repository) throws Exception {
        RemoveScmResult result = getScmManager()
                .getProviderByUrl(getScmUrl())
                .remove(repository, new ScmFileSet(workingDirectory), "Initial Checkin");

        assertTrue("Remove result was successful, output: " + result.getCommandOutput(), result.isSuccess());

        return result;
    }

    /**
     * Convenience method to add a file to the working tree at the working directory
     */
    protected void addToWorkingTree(File workingDirectory, File file, ScmRepository repository) throws Exception {
        ScmProvider provider = getScmManager().getProviderByUrl(getScmUrl());

        CommandParameters commandParameters = new CommandParameters();
        commandParameters.setString(CommandParameter.FORCE_ADD, Boolean.TRUE.toString());

        AddScmResult result = provider.add(repository, new ScmFileSet(workingDirectory, file), commandParameters);

        assertTrue("Check result was successful, output: " + result.getCommandOutput(), result.isSuccess());

        List<ScmFile> addedFiles = result.getAddedFiles();

        if (new File(workingDirectory, file.getPath()).isFile()) {
            // Don't check directory add because some SCM tools ignore it
            assertEquals("Expected 1 file in the added files list " + addedFiles, 1, addedFiles.size());
        }
    }

    /**
     * take the files of the given list, add them to a TreeMap and
     * use the pathName String as key for the Map.
     * This function is useful for every TCK which has to check for the
     * existence of more than 1 file of the returned ScmResult, regardless
     * of their order in the list.
     * All backslashes in the path will be replaced by forward slashes
     * for Windows compatibility.
     *
     * @param files List with {@code ScmFile}s
     * @return Map key=pathName, value=ScmFile
     */
    protected Map<String, ScmFile> mapFilesByPath(List<ScmFile> files) {
        if (files == null) {
            return null;
        }

        Map<String, ScmFile> mappedFiles = new TreeMap<>();
        for (ScmFile scmFile : files) {
            String path = StringUtils.replace(scmFile.getPath(), "\\", "/");
            mappedFiles.put(path, scmFile);
        }

        return mappedFiles;
    }

    protected EditScmResult edit(File basedir, String includes, String excludes, ScmRepository repository)
            throws Exception {
        if (this.getScmManager()
                .getProviderByRepository(this.getScmRepository())
                .requiresEditMode()) {
            ScmFileSet fileSet = new ScmFileSet(basedir, includes, excludes);
            return getScmManager().edit(getScmRepository(), fileSet);
        }
        return new EditScmResult("", "", "", true);
    }
}