/**
    * 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.lifecycle.model;
  
  import java.lang.annotation.Annotation;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.uif.component.ClientSideState;
  import org.kuali.rice.krad.uif.component.Component;
  import org.kuali.rice.krad.uif.lifecycle.ViewLifecycle;
  import org.kuali.rice.krad.uif.lifecycle.ViewLifecycleTaskBase;
  import org.kuali.rice.krad.uif.util.CopyUtils;
  import org.kuali.rice.krad.uif.util.ObjectPropertyUtils;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.uif.view.ViewModel;
  
  /**
   * Synchronize client side state for the component.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class SyncClientSideStateTask extends ViewLifecycleTaskBase<Component> {
  
      /**
       * Default constructor.
       */
      public SyncClientSideStateTask() {
          super(Component.class);
      }
  
      /**
       * Updates the properties of the given component instance with the value found from the
       * corresponding map of client state (if found)
       * 
       * {@inheritDoc}
       */
      @Override
      protected void performLifecycleTask() {
          Component component = (Component) getElementState().getElement();
          ViewModel model = (ViewModel) ViewLifecycle.getModel();
  
          // find the map of state that was sent for component (if any)
          Map<String, Object> clientSideState = model.getClientStateForSyncing();
          if (!(component instanceof View) && clientSideState.containsKey(component.getId())) {
              @SuppressWarnings("unchecked")
              Map<String, Object> componentState =
                      (Map<String, Object>) clientSideState.get(component.getId());
              clientSideState = componentState;
          }
  
          // if state was sent, match with fields on the component that are annotated to have client state
          if ((clientSideState != null) && (!clientSideState.isEmpty())) {
              Map<String, Annotation> annotatedFields = CopyUtils.getFieldsWithAnnotation(component.getClass(),
                      ClientSideState.class);
  
              for (Entry<String, Annotation> annotatedField : annotatedFields.entrySet()) {
                  ClientSideState clientSideStateAnnot = (ClientSideState) annotatedField.getValue();
  
                  String variableName = clientSideStateAnnot.variableName();
                  if (StringUtils.isBlank(variableName)) {
                      variableName = annotatedField.getKey();
                  }
  
                  if (clientSideState.containsKey(variableName)) {
                      Object value = clientSideState.get(variableName);
                      ObjectPropertyUtils.setPropertyValue(component, annotatedField.getKey(), value);
                  }
              }
          }
      }
  
  }