/**
    * Copyright 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.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.enrollment.class2.population.keyvalue;
  
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.core.api.util.ConcreteKeyValue;
  import org.kuali.rice.core.api.util.KeyValue;
  import org.kuali.rice.krad.uif.control.UifKeyValuesFinderBase;
  import org.kuali.rice.krad.uif.view.ViewModel;
  import org.kuali.student.r2.common.util.ContextUtils;
  import org.kuali.student.r2.core.constants.PopulationServiceConstants;
  import org.kuali.student.r2.core.population.dto.PopulationRuleInfo;
  import org.kuali.student.r2.core.population.service.PopulationService;
  
  import javax.xml.namespace.QName;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class holds the list of rule agenda ids to their rule names
   *
   * @author Kuali Student
   */
  public class PopulationRuleAgendaKeyValues extends UifKeyValuesFinderBase implements Serializable {
      private static final long serialVersionUID = 1L;
  
      private transient PopulationService populationService = null;
  
  
      /**
       * Creates a list of KeyValues maping the agenda id to the rule name
       *
       * @param model - The calling view model
       * @return List of all population rule KeyValues
       */
      @Override
      public List<KeyValue> getKeyValues(ViewModel model) {
  
          List<KeyValue> keyValues = new ArrayList<KeyValue>();
  
          // The complete list of Rule Types
          String ruleTypes[] = PopulationServiceConstants.POPULATION_RULE_TYPE_KEYS;
  
          // Grab Rule entries for each Rule Type
          for (int j = 0; j < ruleTypes.length; j++) {
              try {
  
                  // Create a keyValue entry for each Rule found for the type
                  ArrayList<String> populationRules = (ArrayList<String>) getPopulationService().getPopulationRuleIdsByType(ruleTypes[j], ContextUtils.createDefaultContextInfo());
                  for (int i = 0; i < populationRules.size(); i++) {
                      PopulationRuleInfo ruleInfo = getPopulationService().getPopulationRule(populationRules.get(i), ContextUtils.createDefaultContextInfo());
                      if (ruleInfo.getAgendaIds() != null && ruleInfo.getAgendaIds().size() > 0)
                          keyValues.add(new ConcreteKeyValue(ruleInfo.getAgendaIds().get(0), ruleInfo.getName()));
                  }
  
              } catch (Exception e) {
                  throw new RuntimeException("Error getting PopulationRuleInfo", e);
              }
          }
  
          return keyValues;
      }
  
      /**
       * Stores and retrieves the PopulationService for the page
       *
       * @return The population service
       */
      private PopulationService getPopulationService() {
          if (populationService == null) {
              populationService = (PopulationService) GlobalResourceLoader.getService(new QName(PopulationServiceConstants.NAMESPACE, "PopulationService"));
          }
          return this.populationService;
      }
  }