package org.apache.maven.scm.provider.bazaar.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.ChangeFile;
  import org.apache.maven.scm.ChangeSet;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.log.ScmLogger;
  import org.apache.maven.scm.provider.bazaar.command.BazaarConsumer;
  
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  /**
   * @author <a href="mailto:torbjorn@smorgrav.org">Torbjorn Eikli Smorgrav</a>
   * @author Olivier Lamy
   *
   */
  public class BazaarChangeLogConsumer
      extends BazaarConsumer
  {
  
      private static final String BAZAAR_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss Z";
  
      private static final String START_LOG_TAG = "-----";
  
      private static final String REVNO_TAG = "revno: ";
  
      private static final String AUTHOR_TAG = "committer: ";
  
      private static final String TIME_STAMP_TOKEN = "timestamp: ";
  
      private static final String MESSAGE_TOKEN = "message:";
  
      private static final String BRANCH_NICK_TOKEN = "branch nick: ";
  
      private static final String MERGED_TOKEN = "merged: ";
  
      private static final String RENAME_SEPARATOR = " => ";
  
      private List<ChangeSet> logEntries = new ArrayList<ChangeSet>();
  
      private ChangeSet currentChange;
  
      private ChangeSet lastChange;
  
      private boolean isMergeEntry;
  
      private String currentRevision;
  
      private StringBuilder currentComment;
  
      private String userDatePattern;
  
      /**
       * Null means not parsing message nor files, UNKNOWN means parsing message
       */
      private ScmFileStatus currentStatus = null;
  
      public BazaarChangeLogConsumer( ScmLogger logger, String userDatePattern )
      {
          super( logger );
  
          this.userDatePattern = userDatePattern;
      }
  
      public List<ChangeSet> getModifications()
      {
          return logEntries;
      }
  
      /** {@inheritDoc} */
      public void doConsume( ScmFileStatus status, String line )
      {
          String tmpLine = line;
  
          // Parse line
          if ( line.startsWith( START_LOG_TAG ) )
          {
              //If last entry was part a merged entry
              if ( isMergeEntry && lastChange != null )
             {
                 String comment = lastChange.getComment();
                 comment += "\n[MAVEN]: Merged from " + currentChange.getAuthor();
                 comment += "\n[MAVEN]:    " + currentChange.getDateFormatted();
                 comment += "\n[MAVEN]:    " + currentChange.getComment();
                 lastChange.setComment( comment );
             }
 
             //Init a new changeset
             currentChange = new ChangeSet();
             currentChange.setFiles( new ArrayList<ChangeFile>() );
             logEntries.add( currentChange );
 
             //Reset memeber vars
             currentComment = new StringBuilder();
             currentStatus = null;
             currentRevision = "";
             isMergeEntry = false;
         }
         else if ( line.startsWith( MERGED_TOKEN ) )
         {
             //This is part of lastChange and is not a separate log entry
             isMergeEntry = true;
             logEntries.remove( currentChange );
             if ( logEntries.size() > 0 )
             {
                 lastChange = (ChangeSet) logEntries.get( logEntries.size() - 1 );
             }
             else
             {
                 if ( getLogger().isWarnEnabled() )
                 {
                     getLogger().warn( "First entry was unexpectedly a merged entry" );
                 }
                 lastChange = null;
             }
         }
         else if ( line.startsWith( REVNO_TAG ) )
         {
             tmpLine = line.substring( REVNO_TAG.length() );
             tmpLine = tmpLine.trim();
             currentRevision = tmpLine;
         }
         else if ( line.startsWith( AUTHOR_TAG ) )
         {
             tmpLine = line.substring( AUTHOR_TAG.length() );
             tmpLine = tmpLine.trim();
             currentChange.setAuthor( tmpLine );
         }
         else if ( line.startsWith( TIME_STAMP_TOKEN ) )
         {
             tmpLine = line.substring( TIME_STAMP_TOKEN.length() + 3 );
             tmpLine = tmpLine.trim();
             Date date = parseDate( tmpLine, userDatePattern, BAZAAR_TIME_PATTERN );
             currentChange.setDate( date );
         }
         else if ( line.startsWith( MESSAGE_TOKEN ) )
         {
             currentStatus = ScmFileStatus.UNKNOWN;
         }
         else if ( status != null )
         {
             currentStatus = status;
         }
         else if ( currentStatus == ScmFileStatus.UNKNOWN )
         {
             currentComment.append( line );
             currentChange.setComment( currentComment.toString() );
             currentComment.append( "\n" );
         }
         else if ( currentStatus != null )
         {
             tmpLine = tmpLine.trim();
             final ChangeFile changeFile;
             if ( currentStatus == ScmFileStatus.RENAMED )
             {
                 final String[] parts = tmpLine.split( RENAME_SEPARATOR );
                 if ( parts.length != 2 )
                 {
                     changeFile = new ChangeFile( tmpLine, currentRevision );
                 }
                 else
                 {
                     changeFile = new ChangeFile( parts[1], currentRevision );
                     changeFile.setOriginalName( parts[0] );
                 }
             }
             else
             {
                 changeFile = new ChangeFile( tmpLine, currentRevision );
             }
             changeFile.setAction( currentStatus );
             currentChange.addFile( changeFile );
         }
         else if ( line.startsWith( BRANCH_NICK_TOKEN ) )
         {
             //ignore
         }
         else
         {
             if ( getLogger().isWarnEnabled() )
             {
                 getLogger().warn( "Could not figure out of: " + line );
             }
         }
     }
 }