package org.apache.maven.scm.provider.bazaar.command.diff;

 /*

  * 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.ScmFile;

 import org.apache.maven.scm.ScmFileStatus;

 import org.apache.maven.scm.log.ScmLogger;

 import org.apache.maven.scm.provider.bazaar.command.BazaarConsumer;

 import java.io.File;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 /**

  * @author <a href="mailto:torbjorn@smorgrav.org">Torbj�rn Eikli Sm�rgrav</a>

  * @version $Id: BazaarDiffConsumer.java 1306867 2012-03-29 13:45:10Z olamy $

  */

 public class BazaarDiffConsumer

     extends BazaarConsumer

 {

     private static final String MODIFIED_FILE_TOKEN = "=== modified file ";

     private static final String ADDED_FILE_TOKEN = "=== added file ";

     private static final String DELETED_FILE_TOKEN = "=== deleted file ";

     private static final String NO_NEWLINE_TOKEN = "\\ No newline at end of file";

     private static final String FROM_FILE_TOKEN = "---";

     private static final String TO_FILE_TOKEN = "+++";

     private static final String ADDED_LINE_TOKEN = "+";

     private static final String REMOVED_LINE_TOKEN = "-";

     private static final String UNCHANGED_LINE_TOKEN = " ";

     private static final String RANGE_TOKEN = "@@";

     private ScmLogger logger;

     private File workingDirectory;

     private String currentFile;

     private StringBuilder currentDifference;

     private List<ScmFile> changedFiles = new ArrayList<ScmFile>();

     private Map<String,CharSequence> differences = new HashMap<String,CharSequence>();

     private StringBuilder patch = new StringBuilder();

     public BazaarDiffConsumer( ScmLogger logger, File workingDirectory )

     {

         super( logger );

         this.logger = logger;

         this.workingDirectory = workingDirectory;

     }

     /** {@inheritDoc} */

     public void doConsume( ScmFileStatus status, String line )

     {

         String tmpLine = new String( line );

         patch.append( line ).append( "\n" );

         // Parse line

         if ( line.startsWith( MODIFIED_FILE_TOKEN ) )

         {

             tmpLine = line.substring( MODIFIED_FILE_TOKEN.length() );

             tmpLine = tmpLine.trim();

             status = ScmFileStatus.MODIFIED;

             addChangedFile( status, line, tmpLine );

         }

         else if ( line.startsWith( ADDED_FILE_TOKEN ) )

         {

             tmpLine = line.substring( ADDED_FILE_TOKEN.length() );

             tmpLine = tmpLine.trim();

             status = ScmFileStatus.ADDED;

             addChangedFile( status, line, tmpLine );

         }

         else if ( line.startsWith( DELETED_FILE_TOKEN ) )

         {

             tmpLine = line.substring( DELETED_FILE_TOKEN.length() );

             tmpLine = tmpLine.trim();

             status = ScmFileStatus.DELETED;

             addChangedFile( status, line, tmpLine );

         }

         else if ( line.startsWith( TO_FILE_TOKEN ) || line.startsWith( FROM_FILE_TOKEN ) )

         {

             // ignore (to avoid conflicts with add and remove tokens)

         }

         else if ( line.startsWith( ADDED_LINE_TOKEN ) || line.startsWith( REMOVED_LINE_TOKEN )

             || line.startsWith( UNCHANGED_LINE_TOKEN ) || line.startsWith( RANGE_TOKEN )

             || line.startsWith( NO_NEWLINE_TOKEN ) )

         {

             currentDifference.append( line ).append( "\n" );

         }

     }

     /**

      * This method takes into account two types of diff output. <br>

      * - Bazaar 0.7 format: dir/dir/myfile  <br>

      * - Bazaar 0.8 format: a/dir/dir/myfile <br>

      *

      * @param status  Eg. modified or added

      * @param line    The original bazaar output to process (for logging)

      * @param tmpLine The bazaar output to process

      */

     private void addChangedFile( ScmFileStatus status, String line, String tmpLine )

     {

         tmpLine = tmpLine.substring( 1, tmpLine.length() - 1 );

         boolean ok = addChangedFile( status, tmpLine );

         if ( !ok )

         {

             int index = tmpLine.indexOf( '/' );

             if ( index > -1 )

             {

                 tmpLine = tmpLine.substring( index + 1 );

                 ok = addChangedFile( status, tmpLine );

             }

         }

         if ( !ok )

         {

             if ( logger.isWarnEnabled() )

             {

                 logger.warn( "Could not figure out of line: " + line );

             }

         }

     }

     /**

      * @param status

      * @param tmpLine

      * @return True if tmpLine was a valid file and thus added to the changeset

      */

     private boolean addChangedFile( ScmFileStatus status, String tmpLine )

     {

         File tmpFile = new File( workingDirectory, tmpLine );

         if ( status.equals( ScmFileStatus.DELETED ) )

         {

             return true;

         }

         if ( tmpFile.isFile() )

         {

             currentFile = tmpLine;

             currentDifference = new StringBuilder();

             differences.put( currentFile, currentDifference );

             changedFiles.add( new ScmFile( tmpLine, status ) );

             return true;

         }

         return false;

     }

     public List<ScmFile> getChangedFiles()

     {

         return changedFiles;

     }

     public Map<String,CharSequence> getDifferences()

     {

         return differences;

     }

     public String getPatch()

     {

         return patch.toString();

     }

 }