package org.apache.maven.scm.provider.hg.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.hg.command.HgConsumer;
  
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.Locale;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   */
  public class HgChangeLogConsumer
      extends HgConsumer
  {
  
      private static final String TIME_PATTERN = "EEE MMM dd HH:mm:ss yyyy Z";
  
      private static final String REVNO_TAG = "changeset: ";
  
      private static final String TAG_TAG = "tag:         ";
  
      private static final String AUTHOR_TAG = "user: ";
  
      private static final String TIME_STAMP_TOKEN = "date: ";
  
      private static final String MESSAGE_TOKEN = "description:";
  
      private static final String MERGED_TOKEN = "merged: ";
  
      private static final String FILES_TOKEN = "files: ";
  
      private String prevLine = "";
  
      private String prevPrevLine = "";
  
      private ArrayList logEntries = new ArrayList();
  
      private ChangeSet currentChange;
  
      private ChangeSet lastChange;
  
      private boolean isMergeEntry;
  
      private String currentRevision;
  
      private String currentTag; // don't know what to do with this
  
      private String userDatePattern;
  
      private boolean spoolingComments;
  
      private List currentComment = null;
  
      public HgChangeLogConsumer( ScmLogger logger, String userDatePattern )
      {
          super( logger );
  
          this.userDatePattern = userDatePattern;
      }
  
      public List getModifications()
      {
          return logEntries;
      }
  
      public void consumeLine( String line )
      {
  
          // override default behaviour which tries to pick through things for some standard messages.  that
          // does not apply here
          doConsume( null, line );
      }
  
      public void doConsume( ScmFileStatus status, String line )
      {
         String tmpLine = line;
         // If current status == null then this is a new entry
         // If the line == "" and previous line was "", then this is also a new entry
         if ( ( line.equals( "" ) && ( prevLine.equals( "" ) && prevPrevLine.equals( "" ) ) ) || currentComment == null )
         {
             if ( currentComment != null )
             {
                 StringBuffer comment = new StringBuffer();
                 for ( int i = 0; i < currentComment.size() - 1; i++ )
                 {
                     comment.append( currentComment.get( i ) );
                     if ( i + 1 < currentComment.size() - 1 )
                     {
                         comment.append( '\n' );
                     }
                 }
                 currentChange.setComment( comment.toString() );
 
             }
 
             spoolingComments = false;
 
             //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() );
             logEntries.add( currentChange );
 
             //Reset memeber vars
             currentComment = new ArrayList();
             currentRevision = "";
             isMergeEntry = false;
         }
 
         if ( spoolingComments )
         {
             currentComment.add( line );
         }
         else if ( line.startsWith( MESSAGE_TOKEN ) )
         {
             spoolingComments = true;
         }
         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
             {
                 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( TAG_TAG ) )
         {
             tmpLine = line.substring( TAG_TAG.length() ).trim();
             currentTag = 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 ) )
         {
             // TODO: FIX Date Parsing to match Mercurial or fix with template
             tmpLine = line.substring( TIME_STAMP_TOKEN.length() ).trim();
             Date date = parseDate( tmpLine, userDatePattern, TIME_PATTERN, Locale.ENGLISH );
             currentChange.setDate( date );
         }
         else if ( line.startsWith( FILES_TOKEN ) )
         {
             tmpLine = line.substring( FILES_TOKEN.length() ).trim();
             String[] files = tmpLine.split( " " );
             for ( int i = 0; i < files.length; i++ )
             {
                 String file = files[i];
                 ChangeFile changeFile = new ChangeFile( file, currentRevision );
                 currentChange.addFile( changeFile );
             }
         }
         else
         {
             getLogger().warn( "Could not figure out: " + line );
         }
 
         // record previous line
         prevLine = line;
         prevPrevLine = prevLine;
     }
 }