package org.apache.maven.archetype.ui;
   
   /*
    * 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.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.components.interactivity.InputHandler;
  import org.codehaus.plexus.components.interactivity.OutputHandler;
  import org.codehaus.plexus.components.interactivity.Prompter;
  import org.codehaus.plexus.components.interactivity.PrompterException;
  import org.codehaus.plexus.util.StringUtils;
  
  import java.io.IOException;
  import java.util.List;
  
  /**
   * @author raphaelpieroni
   */
  @Component( role = Prompter.class, hint = "archetype" )
  public class ArchetypePrompter
      implements Prompter
  {
  
      @Requirement
      private OutputHandler outputHandler;
  
      @Requirement
      private InputHandler inputHandler;
  
      public String prompt( String message )
          throws PrompterException
      {
          writePrompt( message );
  
          return readLine();
      }
  
      public String prompt( String message, String defaultReply )
          throws PrompterException
      {
          writePrompt( formatMessage( message, null, defaultReply ) );
  
          String line = readLine();
  
          if ( StringUtils.isEmpty( line ) )
          {
              line = defaultReply;
          }
  
          return line;
      }
  
      @SuppressWarnings( { "rawtypes", "unchecked" })
      public String prompt( String message, List possibleValues, String defaultReply )
          throws PrompterException
      {
          String formattedMessage = formatMessage( message, possibleValues, defaultReply );
  
          String line;
  
          do
          {
              writePrompt( formattedMessage );
  
              line = readLine();
  
              if ( StringUtils.isEmpty( line ) )
              {
                  line = defaultReply;
              }
  
              if ( line != null && !possibleValues.contains( line ) )
              {
                  try
                  {
                      outputHandler.writeLine( "Invalid selection." );
                  }
                  catch ( IOException e )
                  {
                      throw new PrompterException( "Failed to present feedback", e );
                  }
              }
         }
         while ( line == null || !possibleValues.contains( line ) );
 
         return line;
     }
 
     @SuppressWarnings( "rawtypes" )
     public String prompt( String message, List possibleValues )
         throws PrompterException
     {
         return prompt( message, possibleValues, null );
     }
 
     public String promptForPassword( String message )
         throws PrompterException
     {
         writePrompt( message );
 
         try
         {
             return inputHandler.readPassword();
         }
         catch ( IOException e )
         {
             throw new PrompterException( "Failed to read user response", e );
         }
     }
 
     private String formatMessage( String message, List<String> possibleValues, String defaultReply )
     {
         StringBuffer formatted = new StringBuffer( message.length() * 2 );
 
         formatted.append( message );
         /*
          * if ( possibleValues != null && !possibleValues.isEmpty() ) { formatted.append( " (" ); for ( Iterator it =
          * possibleValues.iterator(); it.hasNext(); ) { String possibleValue = (String) it.next(); formatted.append(
          * possibleValue ); if ( it.hasNext() ) { formatted.append( '/' ); } } formatted.append( ')' ); }
          */
 
         if ( defaultReply != null )
         {
             formatted.append( defaultReply );
         }
 
         return formatted.toString();
     }
 
     private void writePrompt( String message )
         throws PrompterException
     {
         showMessage( message + ": " );
     }
 
     private String readLine()
         throws PrompterException
     {
         try
         {
             return inputHandler.readLine();
         }
         catch ( IOException e )
         {
             throw new PrompterException( "Failed to read user response", e );
         }
     }
 
     public void showMessage( String message )
         throws PrompterException
     {
         try
         {
             outputHandler.write( message );
         }
         catch ( IOException e )
         {
             throw new PrompterException( "Failed to show message", e );
         }
     }
 
 }