/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.kim.impl.identity.external;
  
  import javax.persistence.CascadeType;
  import javax.persistence.Column;
  import javax.persistence.Entity;
  import javax.persistence.GeneratedValue;
  import javax.persistence.Id;
  import javax.persistence.JoinColumn;
  import javax.persistence.ManyToOne;
  import javax.persistence.PrePersist;
  import javax.persistence.PreUpdate;
  import javax.persistence.Table;
  import javax.persistence.Transient;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.kim.api.identity.external.EntityExternalIdentifier;
  import org.kuali.rice.kim.api.identity.external.EntityExternalIdentifierContract;
  import org.kuali.rice.kim.api.identity.external.EntityExternalIdentifierType;
  import org.kuali.rice.kim.api.services.KimApiServiceLocator;
  import org.kuali.rice.krad.bo.DataObjectBase;
  import org.kuali.rice.krad.data.jpa.PortableSequenceGenerator;
  
  @Entity
  @Table(name = "KRIM_ENTITY_EXT_ID_T")
  public class EntityExternalIdentifierBo extends DataObjectBase implements EntityExternalIdentifierContract {
      private static final Logger LOG = org.apache.log4j.Logger.getLogger(EntityExternalIdentifierBo.class);
      private static final long serialVersionUID = 1L;
  
      @Id
      @Column(name = "ENTITY_EXT_ID_ID")
      @PortableSequenceGenerator(name = "KRIM_ENTITY_EXT_ID_ID_S")
      @GeneratedValue(generator = "KRIM_ENTITY_EXT_ID_ID_S")
      private String id;
  
      @Column(name = "ENTITY_ID")
      private String entityId;
  
      @Column(name = "EXT_ID_TYP_CD")
      private String externalIdentifierTypeCode;
  
      @Column(name = "EXT_ID")
      private String externalId;
  
      @ManyToOne(targetEntity = EntityExternalIdentifierTypeBo.class, cascade = { CascadeType.REFRESH })
      @JoinColumn(name = "EXT_ID_TYP_CD", referencedColumnName = "EXT_ID_TYP_CD", insertable = false, updatable = false)
      private EntityExternalIdentifierTypeBo externalIdentifierType;
  
      @Transient
      private EntityExternalIdentifierType cachedExtIdType = null;
  
      @Transient
      private boolean encryptionRequired = false;
  
      @Transient
      private boolean decryptionNeeded = false;
  
      public static EntityExternalIdentifier to(EntityExternalIdentifierBo bo) {
          if (bo == null) {
              return null;
          }
          return EntityExternalIdentifier.Builder.create(bo).build();
      }
  
      /**
       * Creates a EntityExternalIdentifierBo business object from an immutable representation of a
       * EntityExternalIdentifier.
       *
       * @param immutable immutable EntityExternalIdentifier
       * @return a EntityExternalIdentifierBo
       */
      public static EntityExternalIdentifierBo from(EntityExternalIdentifier immutable) {
          if (immutable == null) {
              return null;
          }
          EntityExternalIdentifierBo bo = new EntityExternalIdentifierBo();
          bo.id = immutable.getId();
          bo.externalId = immutable.getExternalId();
          bo.entityId = immutable.getEntityId();
          bo.externalIdentifierTypeCode = immutable.getExternalIdentifierTypeCode();
          bo.externalIdentifierType = immutable.getExternalIdentifierType() != null ? EntityExternalIdentifierTypeBo.from(immutable.getExternalIdentifierType()) : null;
          bo.setVersionNumber(immutable.getVersionNumber());
          bo.setObjectId(immutable.getObjectId());
         return bo;
     }
 
     @Override
     @PrePersist
     protected void prePersist() {
         super.prePersist();
         encryptExternalId();
     }
 
     @Override
     @PreUpdate
     protected void preUpdate() {
         super.preUpdate();
         if (!this.decryptionNeeded) {
             encryptExternalId();
         }
     }
 
     protected void encryptExternalId() {
         evaluateExternalIdentifierType();
         if (encryptionRequired && StringUtils.isNotEmpty(this.externalId)) {
             try {
                 if (CoreApiServiceLocator.getEncryptionService().isEnabled()) {
                     this.externalId = CoreApiServiceLocator.getEncryptionService().encrypt(this.externalId);
                     this.decryptionNeeded = true;
                 }
             } catch (Exception e) {
                 LOG.info("Unable to encrypt value : " + e.getMessage() + " or it is already encrypted");
             }
         }
     }
 
     protected void decryptExternalId() {
         evaluateExternalIdentifierType();
         if (encryptionRequired && StringUtils.isNotEmpty(externalId)) {
             try {
                 if (CoreApiServiceLocator.getEncryptionService().isEnabled()) {
                     this.externalId = CoreApiServiceLocator.getEncryptionService().decrypt(this.externalId);
                 }
             } catch (Exception e) {
                 LOG.info("Unable to decrypt value : " + e.getMessage() + " or it is already decrypted");
             }
         }
     }
 
     protected void evaluateExternalIdentifierType() {
         if (cachedExtIdType == null) {
             cachedExtIdType = KimApiServiceLocator.getIdentityService().getExternalIdentifierType(externalIdentifierTypeCode);
             encryptionRequired = cachedExtIdType != null && cachedExtIdType.isEncryptionRequired();
         }
     }
 
     protected String decryptedExternalId() {
         evaluateExternalIdentifierType();
         if (encryptionRequired && StringUtils.isNotEmpty(externalId)) {
             try {
                 if (CoreApiServiceLocator.getEncryptionService().isEnabled()) {
                     return CoreApiServiceLocator.getEncryptionService().decrypt(this.externalId);
                 }
             } catch (Exception e) {
                 LOG.info("Unable to decrypt value : " + e.getMessage() + " or it is already decrypted");
             }
         }
         return "";
     }
 
     public void setExternalId(String externalId) {
         this.externalId = externalId;
         this.decryptionNeeded = false;
     }
 
     public void setExternalIdentifierTypeCode(String externalIdentifierTypeCode) {
         this.externalIdentifierTypeCode = externalIdentifierTypeCode;
         cachedExtIdType = null;
     }
 
     public void setExternalIdentifierType(EntityExternalIdentifierTypeBo externalIdentifierType) {
         this.externalIdentifierType = externalIdentifierType;
         cachedExtIdType = null;
     }
 
     @Override
     public EntityExternalIdentifierTypeBo getExternalIdentifierType() {
         return this.externalIdentifierType;
     }
 
     @Override
     public String getExternalId() {
         if (this.decryptionNeeded) {
             return decryptedExternalId();
         }
         return externalId;
     }
 
     @Override
     public String getId() {
         return id;
     }
 
     public void setId(String id) {
         this.id = id;
     }
 
     @Override
     public String getEntityId() {
         return entityId;
     }
 
     public void setEntityId(String entityId) {
         this.entityId = entityId;
     }
 
     @Override
     public String getExternalIdentifierTypeCode() {
         return externalIdentifierTypeCode;
     }
 }