package org.apache.maven.scm.provider.hg.command.update;
   
   /*
    * 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.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  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.ScmVersion;
  import org.apache.maven.scm.command.Command;
  import org.apache.maven.scm.command.changelog.ChangeLogCommand;
  import org.apache.maven.scm.command.update.AbstractUpdateCommand;
  import org.apache.maven.scm.command.update.UpdateScmResult;
  import org.apache.maven.scm.command.update.UpdateScmResultWithRevision;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.hg.HgUtils;
  import org.apache.maven.scm.provider.hg.command.HgCommandConstants;
  import org.apache.maven.scm.provider.hg.command.HgConsumer;
  import org.apache.maven.scm.provider.hg.command.changelog.HgChangeLogCommand;
  import org.apache.maven.scm.provider.hg.command.diff.HgDiffConsumer;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   * @author Olivier Lamy
   *
   */
  public class HgUpdateCommand
      extends AbstractUpdateCommand
      implements Command
  {
      /** {@inheritDoc} */
      protected UpdateScmResult executeUpdateCommand( ScmProviderRepository repo, ScmFileSet fileSet, ScmVersion tag )
          throws ScmException
      {
          File workingDir = fileSet.getBasedir();
  
          String[] updateCmd;
          // Update branch
          if ( repo.isPushChanges() )
          {
              updateCmd =
                  new String[] { HgCommandConstants.PULL_CMD, HgCommandConstants.REVISION_OPTION,
                      tag != null && !StringUtils.isEmpty( tag.getName() ) ? tag.getName() : "tip" };
          }
          else
          {
              updateCmd =
                  new String[] { HgCommandConstants.UPDATE_CMD,
                      tag != null && !StringUtils.isEmpty( tag.getName() ) ? tag.getName() : "tip",
                      HgCommandConstants.CLEAN_OPTION };
          }
          ScmResult updateResult = HgUtils.execute( new HgConsumer(), workingDir, updateCmd );
  
          if ( !updateResult.isSuccess() )
          {
              return new UpdateScmResult( null, null, updateResult );
          }
  
          // Find changes from last revision
          int currentRevision = HgUtils.getCurrentRevisionNumber( workingDir );
          int previousRevision = currentRevision - 1;
          String[] diffCmd = new String[] {
              HgCommandConstants.DIFF_CMD,
              HgCommandConstants.REVISION_OPTION,
              "" + previousRevision };
          HgDiffConsumer diffConsumer = new HgDiffConsumer( workingDir );
          ScmResult diffResult = HgUtils.execute( diffConsumer, workingDir, diffCmd );
  
          // Now translate between diff and update file status
          List<ScmFile> updatedFiles = new ArrayList<>();
          List<CharSequence> changes = new ArrayList<>();
          List<ScmFile> diffFiles = diffConsumer.getChangedFiles();
          Map<String, CharSequence> diffChanges = diffConsumer.getDifferences();
          for ( ScmFile file : diffFiles )
          {
             changes.add( diffChanges.get( file.getPath() ) );
             if ( file.getStatus() == ScmFileStatus.MODIFIED )
             {
                 updatedFiles.add( new ScmFile( file.getPath(), ScmFileStatus.PATCHED ) );
             }
             else
             {
                 updatedFiles.add( file );
             }
         }
         
         if ( repo.isPushChanges() )
         {
             String[] hgUpdateCmd = new String[] { HgCommandConstants.UPDATE_CMD };
             HgUtils.execute( new HgConsumer(), workingDir, hgUpdateCmd );
         }
 
         return new UpdateScmResultWithRevision( updatedFiles, new ArrayList<>( 0 ),
                                                 String.valueOf( currentRevision ), diffResult );
     }
 
     protected ChangeLogCommand getChangeLogCommand()
     {
         return new HgChangeLogCommand();
     }
 }