/*
    * 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.
   */
  package org.apache.maven.scm.provider.hg.command.changelog;
  
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.Locale;
  
  import org.apache.maven.scm.ChangeFile;
  import org.apache.maven.scm.ChangeSet;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.provider.hg.command.HgConsumer;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   * @author <a href="mailto:hr.mohr@gmail.com">Mads Mohr Christensen</a>
   */
  public class HgChangeLogConsumer extends HgConsumer {
  
      private static final String TIME_PATTERN = "yyyy-MM-dd HH:mm:ss Z";
  
      private static final String REVNO_TAG = "changeset:";
  
      private static final String TAG_TAG = "tag:";
  
      private static final String BRANCH_TAG = "branch:";
  
      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 FILES_TOKEN = "files:";
  
      private List<ChangeSet> logEntries = new ArrayList<>();
  
      private ChangeSet currentChange;
  
      private String currentRevision;
  
      @SuppressWarnings("unused")
      private String currentBranch; // don't know what to do with this
  
      private String userDatePattern;
  
      public HgChangeLogConsumer(String userDatePattern) {
          this.userDatePattern = userDatePattern;
      }
  
      public List<ChangeSet> getModifications() {
          return logEntries;
      }
  
      /**
       * {@inheritDoc}
       */
      public void consumeLine(String line) {
          // override default behaviour which tries to pick through things for some standard messages.  that
          // does not apply here
          String trimmedLine = line.trim();
          doConsume(null, trimmedLine);
      }
  
      /**
       * {@inheritDoc}
       */
      public void doConsume(ScmFileStatus status, String line) {
          String tmpLine;
  
          // new changeset
          if (line.startsWith(REVNO_TAG)) {
              // Init a new changeset
              currentChange = new ChangeSet();
              currentChange.setFiles(new ArrayList<>(0));
              logEntries.add(currentChange);
  
              // parse revision
              tmpLine = line.substring(REVNO_TAG.length()).trim();
              currentRevision = tmpLine.substring(tmpLine.indexOf(':') + 1);
              currentChange.setRevision(currentRevision);
          } else if (line.startsWith(BRANCH_TAG)) {
             tmpLine = line.substring(BRANCH_TAG.length()).trim();
             currentBranch = tmpLine;
         } else if (line.startsWith(AUTHOR_TAG)) {
             tmpLine = line.substring(AUTHOR_TAG.length()).trim();
             currentChange.setAuthor(tmpLine);
         } else if (line.startsWith(TIME_STAMP_TOKEN)) {
             tmpLine = line.substring(TIME_STAMP_TOKEN.length()).trim();
             Date date = parseDate(tmpLine, userDatePattern, TIME_PATTERN, Locale.ENGLISH);
             currentChange.setDate(date);
         } else if (line.startsWith(TAG_TAG)) {
             tmpLine = line.substring(TAG_TAG.length()).trim();
             currentChange.addTag(tmpLine);
         } 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 if (line.startsWith(MESSAGE_TOKEN)) {
             currentChange.setComment("");
         } else {
             StringBuilder comment = new StringBuilder(currentChange.getComment());
             comment.append(line);
             currentChange.setComment(comment.toString());
         }
     }
 }