/*
    * 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 org.apache.myfaces.view.facelets.util;
  
  import java.util.ArrayList;
  import java.util.List;
  import javax.faces.FacesException;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIViewRoot;
  import javax.faces.context.FacesContext;
  import org.apache.myfaces.shared.renderkit.JSFAttr;
  import org.apache.myfaces.shared.util.ClassUtils;
  
  /**
   * Utility methods used in FaceletsViewDeclarationLanguage
   *
   * @author Leonardo Uribe
   */
  public class FaceletsViewDeclarationLanguageUtils
  {
      public static Class getReturnType(String signature)
      {
          int endName = signature.indexOf('(');
          if (endName < 0)
          {
              throw new FacesException("Invalid method signature:" + signature);
          }
          int end = signature.lastIndexOf(' ', endName);
          if (end < 0)
          {
              throw new FacesException("Invalid method signature:" + signature);
          }
          try
          {
              return ClassUtils.javaDefaultTypeToClass(signature.substring(0, end));
          }
          catch (ClassNotFoundException e)
          {
              throw new FacesException("Invalid method signature:" + signature);
          }
      }
  
      /**
       * Get the parameters types from the function signature.
       *
       * @return An array of parameter class names
       */
      public static Class[] getParameters(String signature) throws FacesException
      {
          ArrayList<Class> params = new ArrayList<Class>();
          // Signature is of the form
          // <return-type> S <method-name S? '('
          // < <arg-type> ( ',' <arg-type> )* )? ')'
          int start = signature.indexOf('(') + 1;
          boolean lastArg = false;
          while (true)
          {
              int p = signature.indexOf(',', start);
              if (p < 0)
              {
                  p = signature.indexOf(')', start);
                  if (p < 0)
                  {
                      throw new FacesException("Invalid method signature:" + signature);
                  }
                  lastArg = true;
              }
              String arg = signature.substring(start, p).trim();
              if (!"".equals(arg))
              {
                  try
                  {
                      params.add(ClassUtils.javaDefaultTypeToClass(arg));
                  }
                  catch (ClassNotFoundException e)
                  {
                      throw new FacesException("Invalid method signature:" + signature);
                  }
              }
              if (lastArg)
              {
                  break;
              }
             start = p + 1;
         }
         return params.toArray(new Class[params.size()]);
     }
 
     /**
      * Called on restoreView(...) to mark resources as rendered.
      * 
      * @since 2.3
      * @param facesContext
      * @param view 
      */
     public static void markRenderedResources(FacesContext facesContext, UIViewRoot view)
     {
         if (view != null && facesContext.getPartialViewContext().isAjaxRequest())
         {
             markRenderedResources(facesContext, view, view.getComponentResources(facesContext, "head"));
             markRenderedResources(facesContext, view, view.getComponentResources(facesContext, "body"));
         }
     }
 
     private static void markRenderedResources(FacesContext facesContext, UIViewRoot view, 
             List<UIComponent> componentResources)
     {
         if (componentResources != null)
         {
             for (UIComponent component : componentResources)
             {
                 if ("javax.faces.resource.Script".equals(component.getRendererType()) ||
                     "javax.faces.resource.Stylesheet".equals(component.getRendererType()))
                 {
                     String resourceName = (String) component.getAttributes().get(JSFAttr.NAME_ATTR);
                     String libraryName = (String) component.getAttributes().get(JSFAttr.LIBRARY_ATTR);
                     
                     if (resourceName == null)
                     {
                         continue;
                     }
                     if ("".equals(resourceName))
                     {
                         continue;
                     }
 
                     int index = resourceName.indexOf('?');
                     if (index >= 0)
                     {
                         resourceName = resourceName.substring(0, index);
                     }
                     
                     facesContext.getApplication().getResourceHandler().markResourceRendered(
                             facesContext, resourceName, libraryName);
                 }
             }
         }
     }
 }