package org.apache.maven.scm.provider.git.gitexe.command.checkin;

/*
 * 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.
 */

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.FilenameUtils;
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.ScmVersion;
import org.apache.maven.scm.command.checkin.AbstractCheckInCommand;
import org.apache.maven.scm.command.checkin.CheckInScmResult;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.scm.provider.git.command.GitCommand;
import org.apache.maven.scm.provider.git.gitexe.command.GitCommandLineUtils;
import org.apache.maven.scm.provider.git.gitexe.command.add.GitAddCommand;
import org.apache.maven.scm.provider.git.gitexe.command.branch.GitBranchCommand;
import org.apache.maven.scm.provider.git.gitexe.command.status.GitStatusCommand;
import org.apache.maven.scm.provider.git.gitexe.command.status.GitStatusConsumer;
import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
import org.apache.maven.scm.provider.git.util.GitUtil;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.Os;
import org.codehaus.plexus.util.cli.CommandLineUtils;
import org.codehaus.plexus.util.cli.Commandline;

/**
 * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
 * @author Olivier Lamy
 *
 */
public class GitCheckInCommand
    extends AbstractCheckInCommand
    implements GitCommand
{
    private final Map<String, String> environmentVariables;

    public GitCheckInCommand( Map<String, String> environmentVariables )
    {
        super();
        this.environmentVariables = environmentVariables;
    }

    /** {@inheritDoc} */
    protected CheckInScmResult executeCheckInCommand( ScmProviderRepository repo, ScmFileSet fileSet, String message,
                                                      ScmVersion version )
        throws ScmException
    {
        GitScmProviderRepository repository = (GitScmProviderRepository) repo;

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

        int exitCode = -1;

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

        try
        {
            if ( !fileSet.getFileList().isEmpty() )
            {
                // if specific fileSet is given, we have to git-add them first
                // otherwise we will use 'git-commit -a' later

                Commandline clAdd = null;

                //SCM-714: Workaround for the Windows terminal command limit
                if ( Os.isFamily( Os.FAMILY_WINDOWS ) )
                {
                    for ( File file: fileSet.getFileList() )
                    {
                        clAdd = GitAddCommand.createCommandLine( fileSet.getBasedir(),
                                                                 Collections.singletonList( file ) );
                        exitCode = GitCommandLineUtils.execute( clAdd, stdout, stderr );

                        if ( exitCode != 0 )
                        {
                            break;
                        }
                    }
                }
                else
                {
                    clAdd = GitAddCommand.createCommandLine( fileSet.getBasedir(), fileSet.getFileList() );
                    exitCode = GitCommandLineUtils.execute( clAdd, stdout, stderr );
                }

                if ( exitCode != 0 )
                {
                    return new CheckInScmResult( clAdd.toString(), "The git-add command failed.",
                                                 stderr.getOutput(), false );
                }

            }

            // SCM-709: statusCommand uses repositoryRoot instead of workingDirectory, adjust it with
            // relativeRepositoryPath
            URI relativeRepositoryPath = GitStatusCommand.getRelativeCWD( logger, fileSet );

            // git-commit doesn't show single files, but only summary :/
            // so we must run git-status and consume the output
            // borrow a few things from the git-status command
            Commandline clStatus = GitStatusCommand.createCommandLine( repository, fileSet );

            GitStatusConsumer statusConsumer =
                new GitStatusConsumer( fileSet.getBasedir(), relativeRepositoryPath, fileSet );
            exitCode = GitCommandLineUtils.execute( clStatus, statusConsumer, stderr );
            if ( exitCode != 0 )
            {
                // git-status returns non-zero if nothing to do
                if ( logger.isInfoEnabled() )
                {
                    logger.info( "nothing added to commit but untracked files present (use \"git add\" to "
                                          + "track)" );
                }
            }

            if ( statusConsumer.getChangedFiles().isEmpty() )
            {
                return new CheckInScmResult( null, statusConsumer.getChangedFiles() );
            }

            Commandline clCommit = createCommitCommandLine( repository, fileSet, messageFile, environmentVariables );

            exitCode = GitCommandLineUtils.execute( clCommit, stdout, stderr );
            if ( exitCode != 0 )
            {
                return new CheckInScmResult( clCommit.toString(), "The git-commit command failed.", stderr.getOutput(),
                                             false );
            }

            if ( repo.isPushChanges() )
            {
                Commandline cl = createPushCommandLine( repository, fileSet, version );

                exitCode = GitCommandLineUtils.execute( cl, stdout, stderr );
                if ( exitCode != 0 )
                {
                    return new CheckInScmResult( cl.toString(), "The git-push command failed.", stderr.getOutput(),
                                                 false );
                }
            }

            List<ScmFile> checkedInFiles = new ArrayList<>( statusConsumer.getChangedFiles().size() );

            // rewrite all detected files to now have status 'checked_in'
            for ( ScmFile changedFile : statusConsumer.getChangedFiles() )
            {
                ScmFile scmfile = new ScmFile( changedFile.getPath(), ScmFileStatus.CHECKED_IN );

                if ( fileSet.getFileList().isEmpty() )
                {
                    checkedInFiles.add( scmfile );
                }
                else
                {
                    // if a specific fileSet is given, we have to check if the file is really tracked
                    for ( File f : fileSet.getFileList() )
                    {
                        if ( FilenameUtils.separatorsToUnix( f.getPath() ).equals( scmfile.getPath() ) )
                        {
                            checkedInFiles.add( scmfile );
                        }

                    }
                }
            }

            return new CheckInScmResult( clCommit.toString(), checkedInFiles );
        }
        finally
        {
            try
            {
                FileUtils.forceDelete( messageFile );
            }
            catch ( IOException ex )
            {
                // ignore
            }
        }

    }

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

    public Commandline createPushCommandLine( GitScmProviderRepository repository,
                                              ScmFileSet fileSet, ScmVersion version )
        throws ScmException
    {
        Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( fileSet.getBasedir(), "push", repository,
                environmentVariables );

        String branch = GitBranchCommand.getCurrentBranch( repository, fileSet );

        if ( branch == null || branch.length() == 0 )
        {
            throw new ScmException( "Could not detect the current branch. Don't know where I should push to!" );
        }

        cl.createArg().setValue( repository.getPushUrl() );

        cl.createArg().setValue( "refs/heads/" + branch + ":" + "refs/heads/" + branch );

        return cl;
    }

    public static Commandline createCommitCommandLine( GitScmProviderRepository repository, ScmFileSet fileSet,
                                                       File messageFile )
        throws ScmException
    {
        return createCommitCommandLine( repository, fileSet, messageFile, Collections.emptyMap() );
    }

    public static Commandline createCommitCommandLine( GitScmProviderRepository repository, ScmFileSet fileSet,
                                                       File messageFile, Map<String, String> environmentVariables )
        throws ScmException
    {
        Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( fileSet.getBasedir(), "commit" );

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

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

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

        if ( fileSet.getFileList().isEmpty() )
        {
            // commit all tracked files
            cl.createArg().setValue( "-a" );
        }

        if ( GitUtil.getSettings().isCommitNoVerify() )
        {
            cl.createArg().setValue( "--no-verify" );
        }

        return cl;
    }

}
