/**
    * Copyright 2005-2015 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.krms.impl.repository;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.collections.CollectionUtils;
  import org.kuali.rice.core.api.criteria.QueryByCriteria;
  import org.kuali.rice.core.api.criteria.QueryResults;
  import org.kuali.rice.core.api.util.ConcreteKeyValue;
  import org.kuali.rice.core.api.util.KeyValue;
  import org.kuali.rice.coreservice.impl.namespace.NamespaceBo;
  import org.kuali.rice.kns.service.KNSServiceLocator;
  import org.kuali.rice.krad.data.KradDataServiceLocator;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.uif.control.UifKeyValuesFinderBase;
  import org.kuali.rice.krad.uif.view.ViewModel;
  
  /**
   * Helper class that returns all namespaces that have contexts associated w/ them.
   */
  public class AgendaNamespaceValuesFinder extends UifKeyValuesFinderBase {
  
      @Override
      public List<KeyValue> getKeyValues(ViewModel model) {
          List<KeyValue> keyValues = new ArrayList<KeyValue>();
  
          // TODO: this is not efficient -- do a smart 'select distinct' and make sure we have a good index!
  
          QueryByCriteria contextCrit = QueryByCriteria.Builder.create().build();
          QueryResults<ContextBo> contexts = KRADServiceLocator.getDataObjectService().findMatching(ContextBo.class, contextCrit);
  
          QueryResults<NamespaceBo> namespaceBos = KradDataServiceLocator.getDataObjectService().findMatching(NamespaceBo.class,
                  QueryByCriteria.Builder.create().build());
          Map<String, String> namespaceCodeToName = new HashMap<String, String>();
          if (!namespaceBos.getResults().isEmpty()) {
              for (NamespaceBo namespaceBo : namespaceBos.getResults()) {
                  namespaceCodeToName.put(namespaceBo.getCode(), namespaceBo.getName());
              }
          }
  
          List<String> namespaceCodes = new ArrayList<String>();
  
          if (!CollectionUtils.isEmpty(contexts.getResults())) {
              for (ContextBo context : contexts.getResults()) {
                  if (!namespaceCodes.contains(context.getNamespace())) {
                      // add if not already there
                      namespaceCodes.add(context.getNamespace());
                  }
              }
          }
  
          Collections.sort(namespaceCodes);
  
          for (String namespaceCode : namespaceCodes) {
              String namespaceName = namespaceCode;
              if (namespaceCodeToName.containsKey(namespaceCode)) {
                  namespaceName = namespaceCodeToName.get(namespaceCode);
              }
              keyValues.add(new ConcreteKeyValue(namespaceCode, namespaceName));
          }
  
          return keyValues;
      }
  }