package org.apache.maven.scm.provider.git.gitexe.command.changelog;
   
   /*
    * 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.ScmBranch;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmVersion;
  import org.apache.maven.scm.command.changelog.AbstractChangeLogCommand;
  import org.apache.maven.scm.command.changelog.ChangeLogScmRequest;
  import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
  import org.apache.maven.scm.command.changelog.ChangeLogSet;
  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.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  
  import java.io.File;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.TimeZone;
  
  /**
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   * @author Olivier Lamy
   *
   */
  public class GitChangeLogCommand
      extends AbstractChangeLogCommand
      implements GitCommand
  {
      private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss Z";
  
      /** {@inheritDoc} */
      protected ChangeLogScmResult executeChangeLogCommand( ScmProviderRepository repo, ScmFileSet fileSet,
                                                            ScmVersion startVersion, ScmVersion endVersion,
                                                            String datePattern )
          throws ScmException
      {
          return executeChangeLogCommand( repo, fileSet, null, null, null, datePattern, startVersion, endVersion );
      }
  
      /** {@inheritDoc} */
      protected ChangeLogScmResult executeChangeLogCommand( ScmProviderRepository repo, ScmFileSet fileSet,
                                                            Date startDate, Date endDate, ScmBranch branch,
                                                            String datePattern )
          throws ScmException
      {
          return executeChangeLogCommand( repo, fileSet, startDate, endDate, branch, datePattern, null, null );
      }
  
      protected ChangeLogScmResult executeChangeLogCommand( ScmProviderRepository repo, ScmFileSet fileSet,
                                                            Date startDate, Date endDate, ScmBranch branch,
                                                            String datePattern, ScmVersion startVersion,
                                                            ScmVersion endVersion )
          throws ScmException
      {
          return executeChangeLogCommand( repo, fileSet, startDate, endDate, branch, datePattern, startVersion, endVersion, null );
      }
  
      @Override
      protected ChangeLogScmResult executeChangeLogCommand( ChangeLogScmRequest request )
          throws ScmException
      {
          final ScmVersion startVersion = request.getStartRevision();
          final ScmVersion endVersion = request.getEndRevision();
          final ScmFileSet fileSet = request.getScmFileSet();
          final String datePattern = request.getDatePattern();
          return executeChangeLogCommand( request.getScmRepository().getProviderRepository(), fileSet,
              request.getStartDate(), request.getEndDate(), request.getScmBranch(), datePattern, startVersion,
                  endVersion, request.getLimit() );
      }
  
      protected ChangeLogScmResult executeChangeLogCommand( ScmProviderRepository repo, ScmFileSet fileSet,
                                                            Date startDate, Date endDate, ScmBranch branch,
                                                            String datePattern, ScmVersion startVersion,
                                                            ScmVersion endVersion, Integer limit )
          throws ScmException
      {
         Commandline cl = createCommandLine( (GitScmProviderRepository) repo, fileSet.getBasedir(), branch, startDate,
                                             endDate, startVersion, endVersion, limit );
 
         GitChangeLogConsumer consumer = new GitChangeLogConsumer( getLogger(), datePattern );
 
         CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();
 
         int exitCode;
 
         exitCode = GitCommandLineUtils.execute( cl, consumer, stderr, getLogger() );
         if ( exitCode != 0 )
         {
             return new ChangeLogScmResult( cl.toString(), "The git-log command failed.", stderr.getOutput(), false );
         }
         ChangeLogSet changeLogSet = new ChangeLogSet( consumer.getModifications(), startDate, endDate );
         changeLogSet.setStartVersion( startVersion );
         changeLogSet.setEndVersion( endVersion );
 
         return new ChangeLogScmResult( cl.toString(), changeLogSet );
     }
 
     // ----------------------------------------------------------------------
     //
     // ----------------------------------------------------------------------
 
     /**
      * this constructs creates the commandline for the git-whatchanged command.
      * Since it uses --since and --until for the start and end date, the branch
      * and version parameters can be used simultanously. 
      */
     public static Commandline createCommandLine( GitScmProviderRepository repository, File workingDirectory,
                                                  ScmBranch branch, Date startDate, Date endDate,
                                                  ScmVersion startVersion, ScmVersion endVersion )
     {
         return createCommandLine( repository, workingDirectory, branch, startDate, endDate, startVersion, endVersion, null );
     }
 
     static Commandline createCommandLine( GitScmProviderRepository repository, File workingDirectory,
                                                  ScmBranch branch, Date startDate, Date endDate,
                                                  ScmVersion startVersion, ScmVersion endVersion, Integer limit )
     {
         SimpleDateFormat dateFormat = new SimpleDateFormat( DATE_FORMAT );
         dateFormat.setTimeZone( TimeZone.getTimeZone( "GMT" ) );
 
         Commandline cl = GitCommandLineUtils.getBaseGitCommandLine( workingDirectory, "whatchanged" );
 
         if ( startDate != null || endDate != null )
         {
             if ( startDate != null )
             {
                 cl.createArg().setValue( "--since=" + StringUtils.escape( dateFormat.format( startDate ) ) );
             }
 
             if ( endDate != null )
             {
                 cl.createArg().setValue( "--until=" + StringUtils.escape( dateFormat.format( endDate ) ) );
             }
 
         }
 
         // since this parameter is also used for the output formatting, we need it also if no start nor end date is given
         cl.createArg().setValue( "--date=iso" );
 
         if ( startVersion != null || endVersion != null )
         {
             StringBuilder versionRange = new StringBuilder();
             
             if ( startVersion != null )
             {
                 versionRange.append( StringUtils.escape( startVersion.getName() ) );
             }
 
             versionRange.append( ".." );
             
             if ( endVersion != null )
             {
                 versionRange.append( StringUtils.escape( endVersion.getName() ) );
             }
             
             cl.createArg().setValue( versionRange.toString() ); 
 
         }
 
         if ( limit != null && limit > 0 )
         {
             cl.createArg().setValue( "--max-count=" + limit );
         }
 
         if ( branch != null && branch.getName() != null && branch.getName().length() > 0 )
         {
             cl.createArg().setValue( branch.getName() );
         }
 
         // Insert a separator to make sure that files aren't interpreted as part of the version spec
         cl.createArg().setValue( "--" );
         
         // We have to report only the changes of the current project.
         // This is needed for child projects, otherwise we would get the changelog of the 
         // whole parent-project including all childs.
         cl.createArg().setFile( workingDirectory );
         
         return cl;
     }
 }