package org.apache.maven.scm.provider.local.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 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.changelog.ChangeLogCommand;
  import org.apache.maven.scm.command.update.AbstractUpdateCommand;
  import org.apache.maven.scm.command.update.UpdateScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.local.command.LocalCommand;
  import org.apache.maven.scm.provider.local.command.changelog.LocalChangeLogCommand;
  import org.apache.maven.scm.provider.local.metadata.LocalScmMetadata;
  import org.apache.maven.scm.provider.local.metadata.LocalScmMetadataUtils;
  import org.apache.maven.scm.provider.local.repository.LocalScmProviderRepository;
  import org.codehaus.plexus.util.FileUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   * @author Olivier Lamy
   *
   */
  public class LocalUpdateCommand
      extends AbstractUpdateCommand
      implements LocalCommand
  {
      /** {@inheritDoc} */
      protected UpdateScmResult executeUpdateCommand( ScmProviderRepository repo, ScmFileSet fileSet, ScmVersion version )
          throws ScmException
      {
          LocalScmProviderRepository repository = (LocalScmProviderRepository) repo;
  
          if ( version != null )
          {
              throw new ScmException( "The local scm doesn't support tags." );
          }
  
          File root = new File( repository.getRoot() );
  
          String module = repository.getModule();
  
          File source = new File( root, module );
  
          File baseDestination = fileSet.getBasedir();
  
          if ( !baseDestination.exists() )
          {
              throw new ScmException(
                  "The working directory doesn't exist (" + baseDestination.getAbsolutePath() + ")." );
          }
  
          if ( !root.exists() )
          {
              throw new ScmException( "The base directory doesn't exist (" + root.getAbsolutePath() + ")." );
          }
  
          if ( !source.exists() )
          {
              throw new ScmException( "The module directory doesn't exist (" + source.getAbsolutePath() + ")." );
          }
  
          if ( !baseDestination.exists() && !baseDestination.isDirectory() )
          {
              throw new ScmException( "The destination directory isn't a directory or doesn't exist ("
                  + baseDestination.getAbsolutePath() + ")." );
          }
  
          List<ScmFile> updatedFiles;
  
          try
          {
              if ( getLogger().isInfoEnabled() )
              {
                 getLogger().info(
                                   "Updating '" + baseDestination.getAbsolutePath() + "' from '"
                                       + source.getAbsolutePath() + "'." );
             }
 
             @SuppressWarnings( "unchecked" )
             List<File> fileList = FileUtils.getFiles( source.getAbsoluteFile(), "**", null );
             updatedFiles = update( source, baseDestination, fileList );
 
             // process deletions in repository
             LocalScmMetadataUtils metadataUtils = new LocalScmMetadataUtils( getLogger() );
             LocalScmMetadata originalMetadata = metadataUtils.readMetadata( baseDestination );
             if ( originalMetadata != null )
             {
                 LocalScmMetadata newMetadata = metadataUtils.buildMetadata( source );
                 for ( Iterator<String> it = originalMetadata.getRepositoryFileNames().iterator(); it.hasNext(); )
                 {
                     String filename = it.next();
                     if ( !newMetadata.getRepositoryFileNames().contains( filename ) )
                     {
                         File localFile = new File( baseDestination, filename );
                         if ( localFile.exists() )
                         {
                             localFile.delete();
                             updatedFiles.add( new ScmFile( "/" + filename, ScmFileStatus.UPDATED ) );
                         }
                     }
                 }
             }
 
             // rewrite metadata file
             metadataUtils.writeMetadata( baseDestination, metadataUtils.buildMetadata( source ) );
 
         }
         catch ( IOException ex )
         {
             throw new ScmException( "Error while checking out the files.", ex );
         }
 
         return new LocalUpdateScmResult( null, updatedFiles );
     }
 
     private List<ScmFile> update( File source, File baseDestination, List<File> files )
         throws ScmException, IOException
     {
         String sourcePath = source.getAbsolutePath();
 
         List<ScmFile> updatedFiles = new ArrayList<ScmFile>();
 
         for ( Iterator<File> i = files.iterator(); i.hasNext(); )
         {
             File repositoryFile = i.next();
 
             File repositoryDirectory = repositoryFile.getParentFile();
 
             String dest = repositoryFile.getAbsolutePath().substring( sourcePath.length() + 1 );
 
             File destinationFile = new File( baseDestination, dest );
 
             String repositoryFileContents = FileUtils.fileRead( repositoryFile );
 
             if ( destinationFile.exists() )
             {
                 String destionationFileContents = FileUtils.fileRead( destinationFile );
 
                 if ( repositoryFileContents.equals( destionationFileContents ) )
                 {
                     continue;
                 }
             }
 
             File destinationDirectory = destinationFile.getParentFile();
 
             if ( !destinationDirectory.exists() && !destinationDirectory.mkdirs() )
             {
                 throw new ScmException(
                     "Could not create destination directory '" + destinationDirectory.getAbsolutePath() + "'." );
             }
 
             ScmFileStatus status;
 
             if ( destinationFile.exists() )
             {
                 status = ScmFileStatus.UPDATED;
             }
             else
             {
                 status = ScmFileStatus.ADDED;
             }
 
             FileUtils.copyFileToDirectory( repositoryFile, destinationDirectory );
 
             int chop = baseDestination.getAbsolutePath().length();
 
             String fileName = "/" + destinationFile.getAbsolutePath().substring( chop + 1 );
 
             updatedFiles.add( new ScmFile( fileName, status ) );
         }
 
         return updatedFiles;
     }
 
     /** {@inheritDoc} */
     protected ChangeLogCommand getChangeLogCommand()
     {
         return new LocalChangeLogCommand();
     }
 }