/**
    * Copyright 2005-2014 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.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.krad.uif.service.impl;
  
  import java.util.List;
  import java.util.Map;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.krad.service.DataDictionaryService;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.uif.UifConstants.ViewType;
  import org.kuali.rice.krad.uif.service.ViewService;
  import org.kuali.rice.krad.uif.service.ViewTypeService;
  import org.kuali.rice.krad.uif.view.View;
  
  /**
   * Implementation of <code>ViewService</code>
   *
   * <p>
   * Provides methods for retrieving View instances and carrying out the View
   * lifecycle methods. Interacts with the configured <code>ViewHelperService</code>
   * during the view lifecycle
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ViewServiceImpl implements ViewService {
      private static final Logger LOG = Logger.getLogger(ViewServiceImpl.class);
  
      private DataDictionaryService dataDictionaryService;
  
      // TODO: remove once we can get beans by type from spring
      private List<ViewTypeService> viewTypeServices;
  
      /**
       * @see org.kuali.rice.krad.uif.service.ViewService#getViewById(java.lang.String)
       */
      public View getViewById(final String viewId) {
          if (LOG.isDebugEnabled()) {
              LOG.debug("retrieving view instance for id: " + viewId);
          }
          
          return dataDictionaryService.getViewById(viewId);
      }
  
      /**
       * Retrieves the <code>ViewTypeService</code> for the given view type, then builds up the index based
       * on the supported view type parameters and queries the dictionary service to retrieve the view
       * based on its type and index
       *
       * @see org.kuali.rice.krad.uif.service.ViewService#getViewByType(org.kuali.rice.krad.uif.UifConstants.ViewType,
       *      java.util.Map<java.lang.String,java.lang.String>)
       */
      public View getViewByType(ViewType viewType, Map<String, String> parameters) {
          ViewTypeService typeService = getViewTypeService(viewType);
          if (typeService == null) {
              throw new RuntimeException("Unable to find view type service for view type name: " + viewType);
          }
  
          Map<String, String> typeParameters = typeService.getParametersFromRequest(parameters);
  
          View view = dataDictionaryService.getViewByTypeIndex(viewType, typeParameters);
          if (view == null) {
              LOG.warn("View not found for type: " + viewType);
          }
  
          return view;
      }
  
      /**
       * @see org.kuali.rice.krad.uif.service.ViewService#getViewIdForViewType(org.kuali.rice.krad.uif.UifConstants.ViewType,
       * java.util.Map<java.lang.String,java.lang.String>)
       */
      public String getViewIdForViewType(ViewType viewType, Map<String, String> parameters) {
          ViewTypeService typeService = getViewTypeService(viewType);
          if (typeService == null) {
              throw new RuntimeException("Unable to find view type service for view type name: " + viewType);
          }
  
          Map<String, String> typeParameters = typeService.getParametersFromRequest(parameters);
  
          return dataDictionaryService.getViewIdByTypeIndex(viewType, typeParameters);
      }
  
      public ViewTypeService getViewTypeService(UifConstants.ViewType viewType) {
          if (viewTypeServices != null) {
             for (ViewTypeService typeService : viewTypeServices) {
                 if (viewType.equals(typeService.getViewTypeName())) {
                     return typeService;
                 }
             }
         }
 
         return null;
     }
 
     public List<ViewTypeService> getViewTypeServices() {
         return this.viewTypeServices;
     }
 
     public void setViewTypeServices(List<ViewTypeService> viewTypeServices) {
         this.viewTypeServices = viewTypeServices;
     }
 
     protected DataDictionaryService getDataDictionaryService() {
         return this.dataDictionaryService;
     }
 
     public void setDataDictionaryService(DataDictionaryService dataDictionaryService) {
         this.dataDictionaryService = dataDictionaryService;
     }
 
 }