/**
    * Copyright 2005-2013 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.student.lum.lu.ui.course.keyvalues;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  import javax.xml.namespace.QName;
  
  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.rice.krad.web.form.MaintenanceDocumentForm;
  import org.kuali.rice.krms.dto.PropositionEditor;
  import org.kuali.rice.krms.dto.RuleEditor;
  import org.kuali.rice.krms.util.AgendaUtilities;
  import org.kuali.rice.krms.util.PropositionTreeUtil;
  import org.kuali.student.common.util.ContextBuilder;
  import org.kuali.student.lum.lu.ui.krms.dto.LUPropositionEditor;
  import org.kuali.student.r2.common.dto.ContextInfo;
  import org.kuali.student.r2.lum.lrc.dto.ResultValueInfo;
  import org.kuali.student.r2.lum.lrc.dto.ResultValuesGroupInfo;
  import org.kuali.student.r2.lum.lrc.service.LRCService;
  import org.kuali.student.r2.lum.util.constants.LrcServiceConstants;
  
  /**
   * KeyFinder for Grade Values based on the Grade Scale.
   *
   * @author Kuali Student Team
   */
  public class CMGradeValuesKeyFinder extends UifKeyValuesFinderBase {
  
      private LRCService lrcService;
  
      @Override
      public List<KeyValue> getKeyValues(ViewModel model) {
          List<KeyValue> keyValues = new ArrayList<KeyValue>();
          String resultValuesGroupKey = "";
  
          MaintenanceDocumentForm maintenanceForm = (MaintenanceDocumentForm) model;
          RuleEditor ruleEditor = AgendaUtilities.getRuleWrapper(maintenanceForm).getRuleEditor();
  
          PropositionEditor propositionEditor = PropositionTreeUtil.getProposition(ruleEditor);
          if ((propositionEditor != null) && (propositionEditor instanceof LUPropositionEditor)) {
                  resultValuesGroupKey = ((LUPropositionEditor) propositionEditor).getGradeScale();
          }
          
          try {
  
              if (resultValuesGroupKey != null) {
                  ResultValuesGroupInfo rvgInfo = this.getLRCService().getResultValuesGroup(resultValuesGroupKey, this.getContextInfo());
                  List<ResultValueInfo> rvInfos = this.getLRCService().getResultValuesByKeys(rvgInfo.getResultValueKeys(), this.getContextInfo());
  
                  Collections.sort(rvInfos, new Comparator<ResultValueInfo>() {
  
                      @Override
                      public int compare(ResultValueInfo o1, ResultValueInfo o2) {
                          Integer first = Integer.valueOf(o1.getNumericValue());
                          Integer second = Integer.valueOf(o2.getNumericValue());
                          return (second < first) ? -1 : ((second.equals(first)) ? 0 : 1);
                      }
                  });
  
                  for (ResultValueInfo info : rvInfos) {
                      keyValues.add(new ConcreteKeyValue(info.getKey(), info.getName()));
                  }
              }
  
          } catch (Exception e) {
              throw new RuntimeException("Unable to retrieve result values", e);
          }
  
          return keyValues;
      }
  
      private LRCService getLRCService() {
          if (lrcService == null) {
              QName qname = new QName(LrcServiceConstants.NAMESPACE, LrcServiceConstants.SERVICE_NAME_LOCAL_PART);
              lrcService = (LRCService) GlobalResourceLoader.getService(qname);
          }
          return lrcService;
      }
 
     private ContextInfo getContextInfo() {
         return ContextBuilder.loadContextInfo();
     }
 }