package org.apache.maven.scm.provider.git.gitexe.command.branch;
   
   /*
    * 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 org.apache.maven.scm.ScmException;
  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.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.apache.maven.scm.provider.git.gitexe.command.GitCommandLineUtils;
  import org.apache.maven.scm.provider.git.gitexe.command.list.GitListCommand;
  import org.apache.maven.scm.provider.git.gitexe.command.list.GitListConsumer;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  
  import java.io.File;
  
  /**
   * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
   *
   */
  public class GitBranchCommand
      extends AbstractBranchCommand
      implements GitCommand
  {
      /** {@inheritDoc} */
      public ScmResult executeBranchCommand( ScmProviderRepository repo, ScmFileSet fileSet, String branch,
                                             String message )
          throws ScmException
      {
          if ( branch == null || StringUtils.isEmpty( branch.trim() ) )
          {
              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" );
          }
  
          GitScmProviderRepository repository = (GitScmProviderRepository) repo;
  
          Commandline cl = createCommandLine( repository, fileSet.getBasedir(), branch );
  
          CommandLineUtils.StringStreamConsumer stdout = new CommandLineUtils.StringStreamConsumer();
          CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();
          int exitCode;
  
          exitCode = GitCommandLineUtils.execute( cl, stdout, stderr );
          if ( exitCode != 0 )
          {
              return new BranchScmResult( cl.toString(), "The git-branch command failed.", stderr.getOutput(), false );
          }
  
          if ( repo.isPushChanges() )
          {
              // and now push the branch to the upstream repository
              Commandline clPush = createPushCommandLine( repository, fileSet, branch );
  
              exitCode = GitCommandLineUtils.execute( clPush, stdout, stderr );
              if ( exitCode != 0 )
              {
                  return new BranchScmResult( clPush.toString(), "The git-push command failed.", stderr.getOutput(),
                                              false );
              }
          }
  
          // as last action we search for the branched files
          GitListConsumer listConsumer = new GitListConsumer( fileSet.getBasedir(), ScmFileStatus.TAGGED );
  
          Commandline clList = GitListCommand.createCommandLine( repository, fileSet.getBasedir() );
  
          exitCode = GitCommandLineUtils.execute( clList, listConsumer, stderr );
          if ( exitCode != 0 )
          {
              return new BranchScmResult( clList.toString(), "The git-ls-files command failed.", stderr.getOutput(),
                                          false );
         }
 
         return new BranchScmResult( cl.toString(), listConsumer.getListedFiles() );
     }
 
     // ----------------------------------------------------------------------
     //
     // ----------------------------------------------------------------------
 
     public static Commandline createCommandLine( GitScmProviderRepository repository, File workingDirectory,
                                                  String branch )
     {
         Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( workingDirectory, "branch" );
 
         cl.createArg().setValue( branch );
 
         return cl;
     }
 
     public static Commandline createPushCommandLine( GitScmProviderRepository repository, ScmFileSet fileSet,
                                                      String branch )
         throws ScmException
     {
         Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( fileSet.getBasedir(), "push" );
 
         cl.createArg().setValue( repository.getPushUrl() );
         cl.createArg().setValue( "refs/heads/" + branch );
 
         return cl;
     }
 
     /**
      * Helper function to detect the current branch 
      */
     public static String getCurrentBranch( GitScmProviderRepository repository, ScmFileSet fileSet )
         throws ScmException
     {
         Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( fileSet.getBasedir(), "symbolic-ref" );
         cl.createArg().setValue( "HEAD" );
 
         CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();
         GitCurrentBranchConsumer cbConsumer = new GitCurrentBranchConsumer();
         int exitCode;
 
         exitCode = GitCommandLineUtils.execute( cl, cbConsumer, stderr );
 
         if ( exitCode != 0 )
         {
             throw new ScmException( "Detecting the current branch failed: " + stderr.getOutput() );
         }
      
         return cbConsumer.getBranchName();
     }
 }