/*
    *   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.directory.api.ldap.extras.extended.ads_impl.pwdModify;
  
  
  import java.nio.ByteBuffer;
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.EncoderException;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.asn1.ber.tlv.UniversalTag;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.codec.api.ExtendedResponseDecorator;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.extras.extended.pwdModify.PasswordModifyResponse;
  import org.apache.directory.api.ldap.extras.extended.pwdModify.PasswordModifyResponseImpl;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A Decorator for PasswordModifyResponse extended request.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class PasswordModifyResponseDecorator extends ExtendedResponseDecorator<PasswordModifyResponse>
      implements PasswordModifyResponse
  {
      private static final Logger LOG = LoggerFactory.getLogger( PasswordModifyResponseDecorator.class );
  
      private PasswordModifyResponse passwordModifyResponse;
  
      /** stores the length of the request*/
      private int requestLength = 0;
  
  
      public PasswordModifyResponseDecorator( LdapApiService codec, PasswordModifyResponse decoratedMessage )
      {
          super( codec, decoratedMessage );
          passwordModifyResponse = decoratedMessage;
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setResponseValue( byte[] responseValue )
      {
          PasswordModifyResponseDecoder decoder = new PasswordModifyResponseDecoder();
  
          try
          {
              passwordModifyResponse = decoder.decode( responseValue );
  
              if ( responseValue != null )
              {
                  this.responseValue = new byte[responseValue.length];
                  System.arraycopy( responseValue, 0, this.responseValue, 0, responseValue.length );
              }
              else
              {
                  this.responseValue = null;
              }
          }
          catch ( DecoderException e )
          {
              LOG.error( I18n.err( I18n.ERR_04165 ), e );
              throw new RuntimeException( e );
          }
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public byte[] getResponseValue()
      {
          if ( responseValue == null )
          {
              try
             {
                 responseValue = encodeInternal().array();
 
                 if ( responseValue == null )
                 {
                     return null;
                 }
             }
             catch ( EncoderException e )
             {
                 LOG.error( I18n.err( I18n.ERR_04167 ), e );
                 throw new RuntimeException( e );
             }
         }
 
         return responseValue;
     }
 
 
     /**
      * {@inheritDoc}
      */
     public byte[] getGenPassword()
     {
         return getDecorated().getGenPassword();
     }
 
 
     /**
      * @param genPassword the genPassword to set
      */
     public void setGenPassword( byte[] genPassword )
     {
         ( ( PasswordModifyResponseImpl ) getDecorated() ).setGenPassword( genPassword );
     }
 
 
     /**
      * Overload the parent's getResponseName method, as the pwdModify response should not
      * contain the responseName.
      */
     public String getResponseName()
     {
         return null;
     }
 
 
     /**
      * Compute the PasswordModifyResponse extended operation length
      * <pre>
      * 0x30 L1 
      *   | 
      *  [+-- 0x80 L2 genPassword] 
      * </pre>
      */
     /* no qualifier */ int computeLengthInternal()
     {
         requestLength = 0;
 
         if ( passwordModifyResponse.getGenPassword() != null )
         {
             int len = passwordModifyResponse.getGenPassword().length;
             requestLength = 1 + TLV.getNbBytes( len ) + len;
         }
 
         return 1 + TLV.getNbBytes( requestLength ) + requestLength;
     }
 
 
     /**
      * Encodes the PasswordModifyResponse extended operation.
      * 
      * @return A ByteBuffer that contains the encoded PDU
      * @throws org.apache.directory.api.asn1.EncoderException If anything goes wrong.
      */
     /* no qualifier */ ByteBuffer encodeInternal() throws EncoderException
     {
         // Allocate the bytes buffer.
         ByteBuffer bb = ByteBuffer.allocate( computeLengthInternal() );
         
         bb.put( UniversalTag.SEQUENCE.getValue() );
         bb.put( TLV.getBytes( requestLength ) );
 
         if ( passwordModifyResponse.getGenPassword() != null )
         {
             byte[] userIdentity = passwordModifyResponse.getGenPassword();
             bb.put( ( byte ) PasswordModifyResponseConstants.GEN_PASSWORD_TAG );
             bb.put( TLV.getBytes( userIdentity.length ) );
             bb.put( userIdentity );
         }
 
         return bb;
     }
 }