/**

  * Copyright 2005-2011 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.Column

 import javax.persistence.FetchType

 import javax.persistence.GeneratedValue

 import javax.persistence.Id

 import javax.persistence.JoinColumn

 import javax.persistence.ManyToOne

 import javax.persistence.Transient

 import org.apache.commons.lang.StringUtils

 import org.hibernate.annotations.GenericGenerator

 import org.hibernate.annotations.Parameter

 import org.kuali.rice.core.api.CoreApiServiceLocator

 import org.kuali.rice.kim.api.KimConstants

 import org.kuali.rice.kim.api.identity.external.EntityExternalIdentifier

 import org.kuali.rice.kim.api.identity.external.EntityExternalIdentifierContract

 import org.kuali.rice.krad.bo.PersistableBusinessObjectBase

 import org.kuali.rice.krad.service.KRADServiceLocator

 class EntityExternalIdentifierBo extends PersistableBusinessObjectBase implements EntityExternalIdentifierContract {

     private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(EntityExternalIdentifierBo.class)

         private static final long serialVersionUID = 1L;

         @Id

         @GeneratedValue(generator="KRIM_ENTITY_EXT_ID_ID_S")

         @GenericGenerator(name="KRIM_ENTITY_EXT_ID_ID_S",strategy="org.kuali.rice.core.jpa.spring.RiceNumericStringSequenceStyleGenerator",parameters=[

                         @Parameter(name="sequence_name",value="KRIM_ENTITY_EXT_ID_ID_S"),

                         @Parameter(name="value_column",value="id")

                 ])

         @Column(name = "ENTITY_EXT_ID_ID")

         String id;

         @Column(name = "ENTITY_ID")

         String entityId;

         @Column(name = "EXT_ID_TYP_CD")

         String externalIdentifierTypeCode;

         @Column(name = "EXT_ID")

         String externalId;

         @ManyToOne(targetEntity=EntityExternalIdentifierTypeBo.class, fetch = FetchType.EAGER, cascade = [])

         @JoinColumn(name = "EXT_ID_TYP_CD", insertable = false, updatable = false)

         EntityExternalIdentifierTypeBo externalIdentifierType;

     @Transient

     private EntityExternalIdentifierTypeBo cachedExtIdType = null;

         @Transient

     private boolean encryptionRequired = false;

         @Transient

         private boolean decryptionNeeded = false;

       /*

        * Converts a mutable EntityExternalIdentifierBo to an immutable EntityExternalIdentifier representation.

        * @param bo

        * @return an immutable EntityExternalIdentifier

        */

       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 an immutable EntityExternalIdentifier

        * @return a EntityExternalIdentifierBo

        */

       static EntityExternalIdentifierBo from(EntityExternalIdentifier immutable) {

         if (immutable == null) {return null}

         EntityExternalIdentifierBo bo = new EntityExternalIdentifierBo()

         bo.id = immutable.id

         bo.externalId = immutable.externalId

         bo.entityId = immutable.entityId

         bo.externalIdentifierTypeCode = immutable.externalIdentifierTypeCode

         bo.externalIdentifierType = EntityExternalIdentifierTypeBo.from(immutable.externalIdentifierType)

         bo.versionNumber = immutable.versionNumber

         bo.objectId = immutable.objectId

         return bo;

       }

     @Override

         protected void prePersist() {

                 super.prePersist();

                 encryptExternalId();

         }

         @Override

         protected void postLoad() {

         super.postLoad();

         decryptExternalId();

         }

         @Override

         protected void preUpdate() {

                 super.preUpdate();

                 if (!this.decryptionNeeded) {

                         encryptExternalId();

                 }

         }

     protected void encryptExternalId() {

                 evaluateExternalIdentifierType();

                 if ( encryptionRequired && StringUtils.isNotEmpty(this.externalId) ) {

                         try {

                                 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 {

                                 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 ) {

                         Map<String, String> criteria = new HashMap<String, String>();

                     criteria.put(KimConstants.PrimaryKeyConstants.CODE, externalIdentifierTypeCode);

                     cachedExtIdType = (EntityExternalIdentifierTypeBo) KRADServiceLocator.getBusinessObjectService().findByPrimaryKey(EntityExternalIdentifierTypeBo.class, criteria);

                     encryptionRequired = cachedExtIdType!= null && cachedExtIdType.isEncryptionRequired();

                 }

         }

     protected String decryptedExternalId() {

                 evaluateExternalIdentifierType();

                 if ( encryptionRequired && StringUtils.isNotEmpty(externalId) ) {

                         try {

                                 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;

         }

 }