package org.apache.maven.scm.provider.git.gitexe.command.status;
   
   /*
    * 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.commons.lang.StringUtils;
  import org.apache.maven.scm.ScmFile;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.log.ScmLogger;
  import org.apache.regexp.RE;
  import org.apache.regexp.RESyntaxException;
  import org.codehaus.plexus.util.cli.StreamConsumer;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
   */
  public class GitStatusConsumer
      implements StreamConsumer
  {
      /**
       * The pattern used to match added file lines
       */
      private static final String ADDED_PATTERN = "^A[ M]* (.*)$";
  
      /**
       * The pattern used to match modified file lines
       */
      private static final String MODIFIED_PATTERN = "^ *M[ M]* (.*)$";
  
      /**
       * The pattern used to match deleted file lines
       */
      private static final String DELETED_PATTERN = "^ *D * (.*)$";
  
      /**
       * The pattern used to match renamed file lines
       */
      private static final String RENAMED_PATTERN = "R (.*) -> (.*)$";
  
      /**
       * @see #ADDED_PATTERN
       */
      private RE addedRegexp;
  
      /**
       * @see #MODIFIED_PATTERN
       */
      private RE modifiedRegexp;
  
      /**
       * @see #DELETED_PATTERN
       */
      private RE deletedRegexp;
  
      /**
       * @see #RENAMED_PATTERN
       */
      private RE renamedRegexp;
  
      private ScmLogger logger;
  
      private File workingDirectory;
  
      private List<ScmFile> changedFiles = new ArrayList<ScmFile>();
  
      // ----------------------------------------------------------------------
      //
      // ----------------------------------------------------------------------
  
      public GitStatusConsumer( ScmLogger logger, File workingDirectory )
      {
          this.logger = logger;
          this.workingDirectory = workingDirectory;
  
          try
          {
              addedRegexp = new RE( ADDED_PATTERN );
              modifiedRegexp = new RE( MODIFIED_PATTERN );
              deletedRegexp = new RE( DELETED_PATTERN );
             renamedRegexp = new RE( RENAMED_PATTERN );
         }
         catch ( RESyntaxException ex )
         {
             throw new RuntimeException(
                 "INTERNAL ERROR: Could not create regexp to parse git log file. This shouldn't happen. Something is probably wrong with the oro installation.",
                 ex );
         }
     }
 
     // ----------------------------------------------------------------------
     // StreamConsumer Implementation
     // ----------------------------------------------------------------------
 
     /**
      * {@inheritDoc}
      */
     public void consumeLine( String line )
     {
         if ( logger.isDebugEnabled() )
         {
             logger.debug( line );
         }
         if ( StringUtils.isEmpty( line ) )
         {
             return;
         }
 
         ScmFileStatus status = null;
 
         List<String> files = new ArrayList<String>();
 
         if ( addedRegexp.match( line ) )
         {
             status = ScmFileStatus.ADDED;
             files.add( addedRegexp.getParen( 1 ) );
         }
         else if ( modifiedRegexp.match( line ) )
         {
             status = ScmFileStatus.MODIFIED;
             files.add( modifiedRegexp.getParen( 1 ) );
         }
         else if ( deletedRegexp.match( line ) )
         {
             status = ScmFileStatus.DELETED;
             files.add( deletedRegexp.getParen( 1 ) );
         }
         else if ( renamedRegexp.match( line ) )
         {
             status = ScmFileStatus.RENAMED;
             files.add( StringUtils.trim( renamedRegexp.getParen( 1 ) ) );
             files.add( StringUtils.trim( renamedRegexp.getParen( 2 ) ) );
             logger.debug( "RENAMED status for line '" + line + "' files added '" + renamedRegexp.getParen( 1 ) + "' '"
                               + renamedRegexp.getParen( 2 ) );
         }
 
         // If the file isn't a file; don't add it.
         if ( !files.isEmpty() && status != null )
         {
             if ( workingDirectory != null )
             {
                 if ( status == ScmFileStatus.RENAMED )
                 {
                     String oldFilePath = files.get( 0 );
                     String newFilePath = files.get( 1 );
                     if ( new File( workingDirectory, oldFilePath ).isFile() )
                     {
                         logger.debug(
                             "file '" + new File( workingDirectory, oldFilePath ).getAbsolutePath() + "' is a file" );
                         return;
                     }
                     else
                     {
                         logger.debug(
                             "file '" + new File( workingDirectory, oldFilePath ).getAbsolutePath() + "' not a file" );
                     }
                     if ( !new File( workingDirectory, newFilePath ).isFile() )
                     {
                         logger.debug(
                             "file '" + new File( workingDirectory, newFilePath ).getAbsolutePath() + "' not a file" );
                         return;
                     }
                     else
                     {
                         logger.debug(
                             "file '" + new File( workingDirectory, newFilePath ).getAbsolutePath() + "' is a file" );
                     }
                 }
                 else if ( status == ScmFileStatus.DELETED )
                 {
                     if ( new File( workingDirectory, files.get( 0 ) ).isFile() )
                     {
                         return;
                     }
                 }
                 else
                 {
                     if ( !new File( workingDirectory, files.get( 0 ) ).isFile() )
                     {
                         return;
                     }
                 }
             }
 
             for ( String file : files )
             {
                 changedFiles.add( new ScmFile( file, status ) );
             }
         }
     }
 
     public List<ScmFile> getChangedFiles()
     {
         return changedFiles;
     }
 }