/*
 * 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.provider.svn.svnexe.command.branch;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.apache.maven.scm.ScmBranch;
import org.apache.maven.scm.ScmBranchParameters;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFile;
import org.apache.maven.scm.ScmFileSet;
import org.apache.maven.scm.ScmFileStatus;
import org.apache.maven.scm.ScmResult;
import org.apache.maven.scm.command.branch.AbstractBranchCommand;
import org.apache.maven.scm.command.branch.BranchScmResult;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.scm.provider.svn.SvnCommandUtils;
import org.apache.maven.scm.provider.svn.SvnTagBranchUtils;
import org.apache.maven.scm.provider.svn.command.SvnCommand;
import org.apache.maven.scm.provider.svn.repository.SvnScmProviderRepository;
import org.apache.maven.scm.provider.svn.svnexe.command.SvnCommandLineUtils;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.Os;
import org.codehaus.plexus.util.cli.CommandLineException;
import org.codehaus.plexus.util.cli.CommandLineUtils;
import org.codehaus.plexus.util.cli.Commandline;

/**
 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
 * @author Olivier Lamy
 *
 * TODO since this is just a copy, use that instead.
 */
public class SvnBranchCommand extends AbstractBranchCommand implements SvnCommand {

    public ScmResult executeBranchCommand(
            ScmProviderRepository repo, ScmFileSet fileSet, String branch, ScmBranchParameters scmBranchParameters)
            throws ScmException {
        if (branch == null || branch.trim().isEmpty()) {
            throw new ScmException("branch name must be specified");
        }

        if (!fileSet.getFileList().isEmpty()) {
            throw new ScmException("This provider doesn't support branching subsets of a directory");
        }

        SvnScmProviderRepository repository = (SvnScmProviderRepository) repo;

        File messageFile = FileUtils.createTempFile("maven-scm-", ".commit", null);

        try {
            FileUtils.fileWrite(messageFile.getAbsolutePath(), "UTF-8", scmBranchParameters.getMessage());
        } catch (IOException ex) {
            return new BranchScmResult(
                    null,
                    "Error while making a temporary file for the commit message: " + ex.getMessage(),
                    null,
                    false);
        }

        Commandline cl = createCommandLine(repository, fileSet.getBasedir(), branch, messageFile, scmBranchParameters);

        CommandLineUtils.StringStreamConsumer stdout = new CommandLineUtils.StringStreamConsumer();

        CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();

        if (logger.isInfoEnabled()) {
            logger.info("Executing: " + SvnCommandLineUtils.cryptPassword(cl));

            if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                logger.info("Working directory: " + cl.getWorkingDirectory().getAbsolutePath());
            }
        }

        int exitCode;

        try {
            exitCode = SvnCommandLineUtils.execute(cl, stdout, stderr);
        } catch (CommandLineException ex) {
            throw new ScmException("Error while executing command.", ex);
        } finally {
            try {
                FileUtils.forceDelete(messageFile);
            } catch (IOException ex) {
                // ignore
            }
        }

        if (exitCode != 0) {
            return new BranchScmResult(cl.toString(), "The svn branch command failed.", stderr.getOutput(), false);
        }

        List<ScmFile> fileList = new ArrayList<>();

        List<File> files = null;

        try {
            files = FileUtils.getFiles(fileSet.getBasedir(), "**", "**/.svn/**", false);
        } catch (IOException e) {
            throw new ScmException("Error while executing command.", e);
        }

        for (File f : files) {
            fileList.add(new ScmFile(f.getPath(), ScmFileStatus.TAGGED));
        }

        return new BranchScmResult(cl.toString(), fileList);
    }

    /** {@inheritDoc} */
    public ScmResult executeBranchCommand(ScmProviderRepository repo, ScmFileSet fileSet, String branch, String message)
            throws ScmException {
        ScmBranchParameters scmBranchParameters = new ScmBranchParameters(message);
        return executeBranchCommand(repo, fileSet, branch, scmBranchParameters);
    }

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    public static Commandline createCommandLine(
            SvnScmProviderRepository repository, File workingDirectory, String branch, File messageFile) {
        ScmBranchParameters scmBranchParameters = new ScmBranchParameters();
        scmBranchParameters.setRemoteBranching(false);
        scmBranchParameters.setPinExternals(false);
        return createCommandLine(repository, workingDirectory, branch, messageFile, scmBranchParameters);
    }

    public static Commandline createCommandLine(
            SvnScmProviderRepository repository,
            File workingDirectory,
            String branch,
            File messageFile,
            ScmBranchParameters scmBranchParameters) {
        Commandline cl = SvnCommandLineUtils.getBaseSvnCommandLine(workingDirectory, repository);

        cl.createArg().setValue("copy");

        cl.createArg().setValue("--parents");

        cl.createArg().setValue("--file");

        cl.createArg().setValue(messageFile.getAbsolutePath());

        cl.createArg().setValue("--encoding");

        cl.createArg().setValue("UTF-8");

        if (scmBranchParameters != null && scmBranchParameters.isPinExternals()) {
            cl.createArg().setValue("--pin-externals");
        }

        if (scmBranchParameters != null && scmBranchParameters.isRemoteBranching()) {
            if (StringUtils.isNotBlank(scmBranchParameters.getScmRevision())) {
                cl.createArg().setValue("--revision");
                cl.createArg().setValue(scmBranchParameters.getScmRevision());
            }
            String url = SvnCommandUtils.fixUrl(repository.getUrl(), repository.getUser());
            cl.createArg().setValue(url + "@");
        } else {
            cl.createArg().setValue(".");
        }
        // Note: this currently assumes you have the branch base checked out too
        String branchUrl = SvnTagBranchUtils.resolveBranchUrl(repository, new ScmBranch(branch));
        branchUrl = SvnCommandUtils.fixUrl(branchUrl, repository.getUser());
        cl.createArg().setValue(branchUrl + "@");

        return cl;
    }
}
