/*
    * Prometheus: Application Framework
    * Copyright 2012-2026. Tony Washer
    *
    * Licensed 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 io.github.tonywasher.joceanus.prometheus.data;
  
  import io.github.tonywasher.joceanus.gordianknot.api.keyset.GordianKeySet;
  import io.github.tonywasher.joceanus.metis.data.MetisDataDifference;
  import io.github.tonywasher.joceanus.metis.data.MetisDataDifference.MetisDataDiffers;
  import io.github.tonywasher.joceanus.metis.data.MetisDataItem.MetisDataObjectFormat;
  import io.github.tonywasher.joceanus.oceanus.base.OceanusException;
  import io.github.tonywasher.joceanus.oceanus.format.OceanusDataFormatter;
  
  import java.util.Arrays;
  import java.util.Objects;
  
  /**
   * Encrypted Pair.
   */
  public class PrometheusEncryptedPair
          implements MetisDataObjectFormat, MetisDataDiffers {
      /**
       * The value.
       */
      private final Object theValue;
  
      /**
       * The encryptedBytes.
       */
      private byte[] theBytes;
  
      /**
       * The keyset.
       */
      private GordianKeySet theKeySet;
  
      /**
       * Constructor.
       *
       * @param pKeySet the keySet
       * @param pValue  the value.
       * @param pBytes  the encrypted bytes
       */
      PrometheusEncryptedPair(final GordianKeySet pKeySet,
                              final Object pValue,
                              final byte[] pBytes) {
          theKeySet = pKeySet;
          theValue = pValue;
          theBytes = pBytes;
      }
  
      /**
       * Obtain the keySet.
       *
       * @return the keySet.
       */
      public GordianKeySet getKeySet() {
          return theKeySet;
      }
  
      /**
       * Obtain the value.
       *
       * @return the value.
       */
      public Object getValue() {
          return theValue;
      }
  
      /**
       * Obtain the bytes.
       *
       * @return the bytes.
       */
      public byte[] getBytes() {
          return theBytes;
      }
  
      /**
       * Adopt Encryption.
       *
       * @param pEncryptor the encryptor
       * @param pSource    field to adopt encryption from
       * @throws OceanusException on error
       */
      protected void adoptEncryption(final PrometheusEncryptor pEncryptor,
                                     final PrometheusEncryptedPair pSource) throws OceanusException {
         /* Store the keySet */
         theKeySet = pEncryptor.getKeySet();
 
         /* If we need to renew the encryption */
         if (pSource == null
                 || MetisDataDifference.difference(theKeySet, pSource.getKeySet()).isDifferent()
                 || MetisDataDifference.difference(getValue(), pSource.getValue()).isDifferent()) {
             /* encrypt the value */
             theBytes = pEncryptor.encryptValue(getValue());
 
             /* else we can simply adopt the underlying encryption */
         } else {
             /* Pick up the underlying encryption */
             theBytes = pSource.getBytes();
         }
     }
 
     @Override
     public String formatObject(final OceanusDataFormatter pFormatter) {
         /* Format the unencrypted field */
         return pFormatter.formatObject(theValue);
     }
 
     @Override
     public String toString() {
         return theValue.toString();
     }
 
     @Override
     public boolean equals(final Object pThat) {
         /* Handle the trivial cases */
         if (this == pThat) {
             return true;
         }
         if (pThat == null) {
             return false;
         }
 
         /* Make sure that the object is the same class */
         if (pThat.getClass() != this.getClass()) {
             return false;
         }
 
         /* Access the target field */
         final PrometheusEncryptedPair myThat = (PrometheusEncryptedPair) pThat;
 
         /* Check differences */
         if (!theKeySet.equals(myThat.getKeySet())) {
             return false;
         }
 
         /* Check differences */
         if (MetisDataDifference.difference(getValue(), myThat.getValue()).isDifferent()) {
             return false;
         }
 
         /* Check encryption */
         return Arrays.equals(getBytes(), myThat.getBytes());
     }
 
     @Override
     public int hashCode() {
         return Objects.hash(theKeySet, theValue, Arrays.hashCode(theBytes));
     }
 
     @Override
     public MetisDataDifference differs(final Object pThat) {
         /* Reject if null */
         if (pThat == null) {
             return MetisDataDifference.DIFFERENT;
         }
 
         /* Reject if wrong class */
         if (!getClass().equals(pThat.getClass())) {
             return MetisDataDifference.DIFFERENT;
         }
 
         /* Access as correct class */
         final PrometheusEncryptedPair myField = (PrometheusEncryptedPair) pThat;
 
         /* Compare Unencrypted value */
         if (MetisDataDifference.difference(getValue(), myField.getValue()).isDifferent()) {
             return MetisDataDifference.DIFFERENT;
         }
 
         /* Compare Encrypted value */
         if (!Arrays.equals(getBytes(), myField.getBytes())) {
             return MetisDataDifference.SECURITY;
         }
 
         /* Item is the Same */
         return MetisDataDifference.IDENTICAL;
     }
 }