/*
    *   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.certGeneration;
  
  
  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.BerValue;
  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.ExtendedRequestDecorator;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.extras.extended.certGeneration.CertGenerationRequest;
  import org.apache.directory.api.ldap.extras.extended.certGeneration.CertGenerationResponse;
  import org.apache.directory.api.util.Strings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A Decorator for certificate generation extended request.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class CertGenerationRequestDecorator extends ExtendedRequestDecorator<CertGenerationRequest>
      implements CertGenerationRequest
  {
      private static final Logger LOG = LoggerFactory.getLogger( CertGenerationRequestDecorator.class );
  
      private CertGenerationRequest certGenerationRequest;
  
      /** stores the length of the request*/
      private int requestLength = 0;
  
      public CertGenerationRequestDecorator( LdapApiService codec, CertGenerationRequest decoratedMessage )
      {
          super( codec, decoratedMessage );
          certGenerationRequest = decoratedMessage;
      }
  
  
      public CertGenerationRequest getCertGenerationRequest()
      {
          return certGenerationRequest;
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setRequestValue( byte[] requestValue )
      {
          CertGenerationDecoder decoder = new CertGenerationDecoder();
  
          try
          {
              certGenerationRequest = decoder.decode( requestValue );
  
              if ( requestValue != null )
              {
                  this.requestValue = new byte[requestValue.length];
                  System.arraycopy( requestValue, 0, this.requestValue, 0, requestValue.length );
              }
              else
              {
                  this.requestValue = null;
              }
          }
          catch ( DecoderException e )
          {
              LOG.error( I18n.err( I18n.ERR_04165 ), e );
              throw new RuntimeException( e );
          }
      }
  
  
      /**
       * {@inheritDoc}
      */
     @Override
     public byte[] getRequestValue()
     {
         if ( requestValue == null )
         {
             try
             {
                 requestValue = encodeInternal().array();
             }
             catch ( EncoderException e )
             {
                 LOG.error( I18n.err( I18n.ERR_04167 ), e );
                 throw new RuntimeException( e );
             }
         }
 
         if ( requestValue == null )
         {
             return null;
         }
 
         final byte[] copy = new byte[requestValue.length];
         System.arraycopy( requestValue, 0, copy, 0, requestValue.length );
         return copy;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public CertGenerationResponse getResultResponse()
     {
         return ( CertGenerationResponse ) getDecorated().getResultResponse();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public String getTargetDN()
     {
         return getDecorated().getTargetDN();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setTargetDN( String targetDN )
     {
         getDecorated().setTargetDN( targetDN );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public String getIssuerDN()
     {
         return getDecorated().getIssuerDN();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setIssuerDN( String issuerDN )
     {
         getDecorated().setIssuerDN( issuerDN );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public String getSubjectDN()
     {
         return getDecorated().getSubjectDN();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setSubjectDN( String subjectDN )
     {
         getDecorated().setSubjectDN( subjectDN );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public String getKeyAlgorithm()
     {
         return getDecorated().getKeyAlgorithm();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setKeyAlgorithm( String keyAlgorithm )
     {
         getDecorated().setKeyAlgorithm( keyAlgorithm );
     }
 
 
     /**
      * Compute the CertGenerationRequest length 
      * 
      * <pre>
      * 0x30 L1 
      *   | 
      *   +--> 0x04 LL target DN
      *   +--> 0x04 LL issuer DN
      *   +--> 0x04 LL subject DN
      *   +--> 0x04 LL key algorithm
      * </pre>
      */
     /* no qualifier */ int computeLengthInternal()
     {
         int len = Strings.getBytesUtf8( certGenerationRequest.getTargetDN() ).length;
         requestLength = 1 + TLV.getNbBytes( len ) + len;
 
         len = Strings.getBytesUtf8( certGenerationRequest.getIssuerDN() ).length;
         requestLength += 1 + TLV.getNbBytes( len ) + len;
 
         len = Strings.getBytesUtf8( certGenerationRequest.getSubjectDN() ).length;
         requestLength += 1 + TLV.getNbBytes( len ) + len;
 
         len = Strings.getBytesUtf8( certGenerationRequest.getKeyAlgorithm() ).length;
         requestLength += 1 + TLV.getNbBytes( len ) + len;
 
         return 1 + TLV.getNbBytes( requestLength ) + requestLength;
     }
 
 
     /**
      * Encodes the CertGenerationRequest 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 ) );
 
         BerValue.encode( bb, certGenerationRequest.getTargetDN() );
         BerValue.encode( bb, certGenerationRequest.getIssuerDN() );
         BerValue.encode( bb, certGenerationRequest.getSubjectDN() );
         BerValue.encode( bb, certGenerationRequest.getKeyAlgorithm() );
 
         return bb;
     }
 }