/**
    * Copyright 2014 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.
   *
   * Created by delyea on 8/4/14
   */
  package org.kuali.student.lum.lu.ui.course.keyvalues;
  
  import org.kuali.rice.core.api.util.ConcreteKeyValue;
  import org.kuali.rice.core.api.util.KeyValue;
  import org.kuali.rice.kew.api.KewApiServiceLocator;
  import org.kuali.rice.kew.api.document.WorkflowDocumentService;
  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.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class returns all the previous node names for a particular document in an ordered list. This
   * class assumes the node list is sequential.
   *
   * @author Kuali Student Team
   */
  public class PreviousNodeNamesValuesFinder extends UifKeyValuesFinderBase {
  
      private static final Logger LOG = LoggerFactory.getLogger(PreviousNodeNamesValuesFinder.class);
      private WorkflowDocumentService workflowDocumentService;
  
      @Override
      public List<KeyValue> getKeyValues(ViewModel model) {
          List<KeyValue> nodeNames = new ArrayList<KeyValue>();
          final MaintenanceDocumentForm form = (MaintenanceDocumentForm) model;
          // loop the node names from the workflow service to build the list
          for (String nodeName : getWorkflowDocumentService().getPreviousRouteNodeNames(form.getDocument().getDocumentNumber())) {
              // both the key and value should be set to the node name
              nodeNames.add(new ConcreteKeyValue(nodeName, nodeName));
          }
          return nodeNames;
      }
  
      public WorkflowDocumentService getWorkflowDocumentService() {
          if (workflowDocumentService == null) {
              workflowDocumentService = KewApiServiceLocator.getWorkflowDocumentService();
          }
          if (null == workflowDocumentService) {
              throw new RuntimeException("Workflow Document Service is unavailable");
          }
          return workflowDocumentService;
      }
  
  }