package org.apache.maven.plugins.artifact.buildinfo;
   
   /*
    * 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.cli.MavenCli;
  import org.apache.maven.shared.utils.StringUtils;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Properties;
  
  /**
   * Helper to calculate the full Maven version string, as done in Maven Core
   * in CLIReportingUtils.
   * @see org.apache.maven.cli.CLIReportingUtils
   */
  
  class MavenVersion
  {
      static String createMavenVersionString()
      {
          return createMavenVersionString( getBuildProperties() );
      }
  
      /**
       * Create a human readable string containing the Maven version, buildnumber, and time of build
       *
       * @param buildProperties The build properties
       * @return Readable build info
       */
      private static String createMavenVersionString( Properties buildProperties )
      {
          String timestamp = reduce( buildProperties.getProperty( "timestamp" ) );
          String version = reduce( buildProperties.getProperty( "version" ) );
          String rev = reduce( buildProperties.getProperty( "buildNumber" ) );
          String distributionName = reduce( buildProperties.getProperty( "distributionName" ) );
  
          String msg = distributionName + " ";
          msg += ( version != null ? version : "<version unknown>" );
          if ( rev != null || timestamp != null )
          {
              msg += " (";
              msg += ( rev != null ? rev : "" );
              if ( StringUtils.isNotBlank( timestamp ) )
              {
                  String ts = formatTimestamp( Long.valueOf( timestamp ) );
                  msg += ( rev != null ? "; " : "" ) + ts;
              }
              msg += ")";
          }
          return msg;
      }
  
      private static String reduce( String s )
      {
          return ( s != null ? ( s.startsWith( "${" ) && s.endsWith( "}" ) ? null : s ) : null );
      }
  
      private static Properties getBuildProperties()
      {
          Properties properties = new Properties();
  
          try ( InputStream resourceAsStream = MavenCli.class.getResourceAsStream(
                  "/org/apache/maven/messages/build.properties" ) )
          {
  
              if ( resourceAsStream != null )
              {
                  properties.load( resourceAsStream );
              }
          }
          catch ( IOException e )
          {
              System.err.println( "Unable determine version from JAR file: " + e.getMessage() );
          }
  
          return properties;
      }
  
      private static String formatTimestamp( long timestamp )
     {
         SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd'T'HH:mm:ssXXX" );
         return sdf.format( new Date( timestamp ) );
     }
 }