/**
    * Copyright 2005-2012 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.kew.impl.actionlist;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.exception.RiceIllegalArgumentException;
  import org.kuali.rice.kew.actionlist.CustomActionListAttribute;
  import org.kuali.rice.kew.actionlist.DefaultCustomActionListAttribute;
  import org.kuali.rice.kew.api.action.ActionItem;
  import org.kuali.rice.kew.api.action.ActionItemCustomization;
  import org.kuali.rice.kew.doctype.bo.DocumentType;
  import org.kuali.rice.kew.doctype.service.DocumentTypeService;
  import org.kuali.rice.kew.framework.actionlist.ActionListCustomizationHandlerService;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Reference implementation of the ActionListCustomizationHandlerService.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ActionListCustomizationHandlerServiceImpl implements ActionListCustomizationHandlerService {
  
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(ActionListCustomizationHandlerServiceImpl.class);
  
      private DocumentTypeService documentTypeService;
  
      @Override
      public List<ActionItemCustomization> customizeActionList(String principalId, List<ActionItem> actionItems)
              throws RiceIllegalArgumentException {
          if (StringUtils.isBlank(principalId)) {
              throw new RiceIllegalArgumentException("principalId was null or blank");
          }
          if (actionItems == null) { actionItems = Collections.emptyList(); }
  
          List<ActionItemCustomization> actionItemCustomizations =
                  new ArrayList<ActionItemCustomization>(actionItems.size());
  
          for (ActionItem actionItem : actionItems) {
              DocumentType documentType = getDocumentTypeService().findByName(actionItem.getDocName());
  
              try { // try to get the custom action list attribute and convert it to an ActionItemCustomization
                  CustomActionListAttribute customActionListAttribute = null;
                  if (documentType != null) {
                      customActionListAttribute = documentType.getCustomActionListAttribute();
                  }
  
                  if (customActionListAttribute == null) {
                      customActionListAttribute = getDefaultCustomActionListAttribute();
                  }
  
                  ActionItemCustomization actionItemCustomization = ActionItemCustomization.Builder.create(
                          actionItem.getId(),
                          customActionListAttribute.getLegalActions(principalId, actionItem),
                          customActionListAttribute.getDocHandlerDisplayParameters(principalId, actionItem)).build();
                  // add to our results
                  actionItemCustomizations.add(actionItemCustomization);
  
              } catch (Exception e) {
                  LOG.error("Problem loading custom action list attribute for action item " + actionItem.getId(), e);
              }
          }
  
          return actionItemCustomizations;
      }
  
      public DocumentTypeService getDocumentTypeService() {
          return documentTypeService;
      }
  
      public void setDocumentTypeService(DocumentTypeService documentTypeService) {
          this.documentTypeService = documentTypeService;
      }
  
      // Lazy initialization holder class (see Effective Java Item #71)
      private static class DefaultCustomActionListAttributeHolder {
          // lazy initing in case customizations require services for instantiation -- could happen ;-)
          static final CustomActionListAttribute defaultCustomActionListAttribute =
                  new DefaultCustomActionListAttribute();
      }
  
      private CustomActionListAttribute getDefaultCustomActionListAttribute() {
         return DefaultCustomActionListAttributeHolder.defaultCustomActionListAttribute;
     }
 }