/**

  * Copyright 2010 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.osedu.org/licenses/ECL-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.kuali.student.core.document.dao.impl;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.ListIterator;

 import javax.persistence.EntityManager;

 import javax.persistence.PersistenceContext;

 import javax.persistence.Query;

 import org.apache.log4j.Logger;

 import org.kuali.student.core.dao.impl.AbstractSearchableCrudDaoImpl;

 import org.kuali.student.core.document.dao.DocumentDao;

 import org.kuali.student.core.document.entity.Document;

 import org.kuali.student.core.document.entity.DocumentCategory;

 import org.kuali.student.core.document.entity.RefDocRelation;

 import org.kuali.student.core.exceptions.DoesNotExistException;

 /**

  * This is a description of what this class does - lindholm don't forget to fill this in.

  * 

  * @author Kuali Rice Team (kuali-rice@googlegroups.com)

  */

 public class DocumentDaoImpl extends AbstractSearchableCrudDaoImpl implements DocumentDao {

     final Logger logger = Logger.getLogger(DocumentDaoImpl.class);

     @PersistenceContext(unitName = "Document")

     @Override

     public void setEm(EntityManager em) {

         super.setEm(em);

     }

     @Override

     public Boolean addDocumentCategoryToDocument(String documentId, String documentCategoryKey) throws DoesNotExistException {

         DocumentCategory category = fetch(DocumentCategory.class, documentCategoryKey);

         Document doc = fetch(Document.class, documentId);

         List<DocumentCategory> categoryList = doc.getCategoryList();

         categoryList.add(category);

         doc.setCategoryList(categoryList);

         update(doc);

         return true;

     }

     @Override

     public List<DocumentCategory> getCategoriesByDocument(String documentId) {

         Document doc = null;

         try {

             doc = fetch(Document.class, documentId);

         } catch (DoesNotExistException e) {

             logger.error("Exception occured: ", e);

         }

         List<DocumentCategory> categories = doc.getCategoryList();

         return categories;

     }

     @Override

     public List<Document> getDocumentsByIdList(List<String> documentIdList) throws DoesNotExistException {

         List<Document> documents = new ArrayList<Document>();

         for (String documentId : documentIdList) {

             Document document;

             document = fetch(Document.class, documentId);

             documents.add(document);

         }

         return documents;

     }

     @Override

     public Boolean removeDocumentCategoryFromDocument(String documentId, String documentCategoryKey) throws DoesNotExistException {

         Document document = fetch(Document.class, documentId);

         List<DocumentCategory> categories = document.getCategoryList();

         ListIterator<DocumentCategory> listIterator = categories.listIterator();

         //Because there must be atleast one category associated with a document. 

         //https://test.kuali.org/confluence/display/KULSTU/Document+Service+Description+and+Assumptions

         if(categories.size()<=1){

             return false;

         }

         for (int intIndex = 0; intIndex < categories.size(); intIndex++) {

             DocumentCategory category = listIterator.next();

             if (category.getId().equals(documentCategoryKey)) {

               listIterator.remove();

             }

         }

         document.setCategoryList(categories);

         update(document);

         return true;

     }

         @Override

         public List<RefDocRelation> getRefDocRelationsByRef(

                         String refObjectTypeKey, String refObjectId) {

                 Query query = em.createNamedQuery("RefDocRelation.getRefDocRelationsByRef");

                 query.setParameter("refObjectTypeKey", refObjectTypeKey);

                 query.setParameter("refObjectId", refObjectId);

                 @SuppressWarnings("unchecked")

                 List<RefDocRelation> resultList = query.getResultList();

                 return resultList;

         }

         @Override

         public List<RefDocRelation> getRefDocRelationsByDoc(String documentId) {

                 Query query = em.createNamedQuery("RefDocRelation.getRefDocRelationsByDoc");

                 query.setParameter("documentId", documentId);

                 @SuppressWarnings("unchecked")

                 List<RefDocRelation> resultList = query.getResultList();

                 return resultList;

         }

 }