/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache 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.apache.org/licenses/LICENSE-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.
   */
  package javax.faces.component;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
  
  import javax.faces.FacesException;
  import javax.faces.component.visit.VisitCallback;
  import javax.faces.component.visit.VisitContext;
  import javax.faces.component.visit.VisitResult;
  import javax.faces.context.FacesContext;
  import javax.faces.event.PostValidateEvent;
  import javax.faces.event.PreValidateEvent;
  import javax.faces.view.Location;
  
  import java.util.Collection;
  
  /**
   * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
   */
  @JSFComponent(type = "javax.faces.Form", family = "javax.faces.Form")
  public class UIForm extends UIComponentBase implements NamingContainer, UniqueIdVendor
  {
      // private static final Log log = LogFactory.getLog(UIForm.class);
  
      //private boolean _submitted;
  
      /**
       * 
       * {@inheritDoc}
       * 
       * @since 2.0
       */
      public String createUniqueId(FacesContext context, String seed)
      {
          StringBuilder bld = null;
          
          // When prependId is set to false, it is necessary to append an unique
          // prefix to ensure the generated ids are unique, but that's only necessary
          // when no seed is provided. If a seed is provided, that one is already unique
          // for all the view, so the following logic is not necessary.
          if (!isPrependId() && seed==null )
          {
              bld = new StringBuilder();
              UniqueIdVendor parentUniqueIdVendor = _ComponentUtils.findParentUniqueIdVendor(this);
              if (parentUniqueIdVendor == null)
              {
                  UIViewRoot viewRoot = context.getViewRoot();
                  if (viewRoot != null)
                  {
                      bld.append(viewRoot.createUniqueId());
                      bld.append('_');
                  }
                  else
                  {
                      // The RI throws a NPE
                      String location = getComponentLocation(this);
                      throw new FacesException("Cannot create clientId. No id is assigned for component"
                              + " to create an id and UIViewRoot is not defined: "
                              + getPathToComponent(this)
                              + (location != null ? " created from: " + location : ""));
                  }
              }
              else
              {
                  bld.append(parentUniqueIdVendor.createUniqueId(context, null));
                  bld.append('_');
              }
          }
          else
          {
              bld = _getSharedStringBuilder(context);
          }
  
          // Generate an identifier for a component. The identifier will be prefixed with
          // UNIQUE_ID_PREFIX, and will be unique within this UIViewRoot.
          if(seed==null)
          {
              Integer uniqueIdCounter = (Integer) getStateHelper().get(PropertyKeys.uniqueIdCounter);
              uniqueIdCounter = (uniqueIdCounter == null) ? 0 : uniqueIdCounter;
              getStateHelper().put(PropertyKeys.uniqueIdCounter, (uniqueIdCounter+1));
              return bld.append(UIViewRoot.UNIQUE_ID_PREFIX).append(uniqueIdCounter).toString();    
         }
         // Optionally, a unique seed value can be supplied by component creators
         // which should be included in the generated unique id.
         else
         {
             return bld.append(UIViewRoot.UNIQUE_ID_PREFIX).append(seed).toString();
         }
     }
     
     public boolean isSubmitted()
     {
         //return _submitted;
         return (Boolean) getTransientStateHelper().getTransient(PropertyKeys.submitted, false);
     }
 
     public void setSubmitted(boolean submitted)
     {
         getTransientStateHelper().putTransient(PropertyKeys.submitted, submitted);
         //_submitted = submitted;
     }
 
     @Override
     public void processDecodes(FacesContext context)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }
         try
         {
             setCachedFacesContext(context);
             try
             {
                 pushComponentToEL(context, this);
                 
                 decode(context);
                 
                 if (!isSubmitted())
                 {
                     return;
                 }
 
                 int facetCount = getFacetCount();
                 if (facetCount > 0)
                 {
                     for (UIComponent facet : getFacets().values())
                     {
                         facet.processDecodes(context);
                     }
                 }
                 
                 for (int i = 0, childCount = getChildCount(); i < childCount; i++)
                 {
                     UIComponent child = getChildren().get(i);
                     child.processDecodes(context);
                 }
                 
             }
             finally
             {
                 popComponentFromEL(context);
             }
         }
         finally
         {
             setCachedFacesContext(null);
         }
     }
 
     @Override
     public void processValidators(FacesContext context)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }
         
         try
         {
             setCachedFacesContext(context);
             try
             {
                 pushComponentToEL(context, this);
                 // SF issue #1050022: a form used within a datatable will loose it's submitted state
                 // as UIForm is no EditableValueHolder and therefore it's state is not saved/restored by UIData
                 // to restore the submitted state we call decode here again
                 if (!isSubmitted())
                 {
                     decode(context);
                 }
                 if (!isSubmitted())
                 {
                     return;
                 }
 
                 //Pre validation event dispatch for component
                 context.getApplication().publishEvent(context,  PreValidateEvent.class, getClass(), this);
                 
                 int facetCount = getFacetCount();
                 if (facetCount > 0)
                 {
                     for (UIComponent facet : getFacets().values())
                     {
                         facet.processValidators(context);
                     }
                 }
                 
                 for (int i = 0, childCount = getChildCount(); i < childCount; i++)
                 {
                     UIComponent child = getChildren().get(i);
                     child.processValidators(context);
                 }
                 
             }
             finally
             {
                 context.getApplication().publishEvent(context,  PostValidateEvent.class, getClass(), this);
                 popComponentFromEL(context);
             }
         }
         finally
         {
             setCachedFacesContext(null);
         }
     }
 
     @Override
     public void processUpdates(FacesContext context)
     {
         if (context == null)
         {
             throw new NullPointerException("context");
         }
         
         try
         {
             setCachedFacesContext(context);
             try
             {
                 pushComponentToEL(context, this);
                 // SF issue #1050022: a form used within a datatable will loose it's submitted state
                 // as UIForm is no EditableValueHolder and therefore it's state is not saved/restored by UIData
                 // to restore the submitted state we call decode here again
                 if (!isSubmitted())
                 {
                     decode(context);
                 }
                 if (!isSubmitted())
                 {
                     return;
                 }
                 
                 int facetCount = getFacetCount();
                 if (facetCount > 0)
                 {
                     for (UIComponent facet : getFacets().values())
                     {
                         facet.processUpdates(context);
                     }
                 }
                 
                 for (int i = 0, childCount = getChildCount(); i < childCount; i++)
                 {
                     UIComponent child = getChildren().get(i);
                     child.processUpdates(context);
                 }
 
             }
             finally
             {
                 popComponentFromEL(context);
             }
         }
         finally
         {
             setCachedFacesContext(null);
         }
     }
 
     enum PropertyKeys
     {
          prependId,
          uniqueIdCounter,
          submitted,
     }
 
     @Override
     public boolean invokeOnComponent(FacesContext context, String clientId, ContextCallback callback) throws FacesException {
         if (isPrependId()) {
             String baseClientId = getClientId(context);
 
             // skip if the component is not a children of the UIForm
             if (!clientId.startsWith(baseClientId)) {
                 return false;
             }
         }
 
         return super.invokeOnComponent(context, clientId, callback);
     }
 
     @Override
     public boolean visitTree(VisitContext context, VisitCallback callback)
     {
         if (!isPrependId())
         {
             // Since the container client id will not be added to child clientId,
             // It is not possible to take advantage of NamingContainer interface
             // and prevent visit child nodes. Just do it as default.
             return super.visitTree(context, callback);
         }
         else
         {
             pushComponentToEL(context.getFacesContext(), this);
             boolean isCachedFacesContext = isCachedFacesContext();
             try
             {
                 if (!isCachedFacesContext)
                 {
                     setCachedFacesContext(context.getFacesContext());
                 }
 
                 if (!isVisitable(context))
                 {
                     return false;
                 }
 
                 VisitResult res = context.invokeVisitCallback(this, callback);
                 switch (res)
                 {
                 //we are done nothing has to be processed anymore
                 case COMPLETE:
                     return true;
 
                 case REJECT:
                     return false;
 
                 //accept
                 default:
                     // Take advantage of the fact this is a NamingContainer
                     // and we can know if there are ids to visit inside it
                     Collection<String> subtreeIdsToVisit = context.getSubtreeIdsToVisit(this);
 
                     if (subtreeIdsToVisit != null && !subtreeIdsToVisit.isEmpty())
                     {
                         if (getFacetCount() > 0)
                         {
                             for (UIComponent facet : getFacets().values())
                             {
                                 if (facet.visitTree(context, callback))
                                 {
                                     return true;
                                 }
                             }
                         }
                         for (int i = 0, childCount = getChildCount(); i < childCount; i++)
                         {
                             UIComponent child = getChildren().get(i);
                             if (child.visitTree(context, callback))
                             {
                                 return true;
                             }
                         }
                     }
                     return false;
                 }
             }
             finally
             {
                 //all components must call popComponentFromEl after visiting is finished
                 popComponentFromEL(context.getFacesContext());
                 if (!isCachedFacesContext)
                 {
                     setCachedFacesContext(null);
                 }
             }
         }
     }
 
     // ------------------ GENERATED CODE BEGIN (do not modify!) --------------------
 
     public static final String COMPONENT_TYPE = "javax.faces.Form";
     public static final String COMPONENT_FAMILY = "javax.faces.Form";
     private static final String DEFAULT_RENDERER_TYPE = "javax.faces.Form";
 
     public UIForm()
     {
         setRendererType(DEFAULT_RENDERER_TYPE);
     }
 
     @Override
     public String getFamily()
     {
         return COMPONENT_FAMILY;
     }
 
     private String getComponentLocation(UIComponent component)
     {
         Location location = (Location) component.getAttributes()
                 .get(UIComponent.VIEW_LOCATION_KEY);
         if (location != null)
         {
             return location.toString();
         }
         return null;
     }
     
     private String getPathToComponent(UIComponent component)
     {
         StringBuffer buf = new StringBuffer();
 
         if (component == null)
         {
             buf.append("{Component-Path : ");
             buf.append("[null]}");
             return buf.toString();
         }
 
         getPathToComponent(component, buf);
 
         buf.insert(0, "{Component-Path : ");
         buf.append("}");
 
         return buf.toString();
     }
     
     private void getPathToComponent(UIComponent component, StringBuffer buf)
     {
         if (component == null)
         {
             return;
         }
 
         StringBuffer intBuf = new StringBuffer();
 
         intBuf.append("[Class: ");
         intBuf.append(component.getClass().getName());
         if (component instanceof UIViewRoot)
         {
             intBuf.append(",ViewId: ");
             intBuf.append(((UIViewRoot) component).getViewId());
         }
         else
         {
             intBuf.append(",Id: ");
             intBuf.append(component.getId());
         }
         intBuf.append("]");
 
         buf.insert(0, intBuf.toString());
 
         getPathToComponent(component.getParent(), buf);
     }
 
     // ------------------ GENERATED CODE END ---------------------------------------
 
     @Override
     public String getContainerClientId(FacesContext ctx)
     {
         if (isPrependId())
         {
             return super.getContainerClientId(ctx);
         }
         UIComponent parentNamingContainer = _ComponentUtils.findParentNamingContainer(this, false);
         if (parentNamingContainer != null)
         {
             return parentNamingContainer.getContainerClientId(ctx);
         }
         return null;
     }
 
     @JSFProperty(defaultValue = "true")
     public boolean isPrependId()
     {
         return (Boolean) getStateHelper().eval(PropertyKeys.prependId, true);
     }
 
     public void setPrependId(boolean prependId)
     {
         getStateHelper().put(PropertyKeys.prependId, prependId ); 
     }
 }