/*
    * 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.application;
  
  import java.util.Deque;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Set;
  import javax.faces.application.ResourceVisitOption;
  import javax.faces.context.FacesContext;
  import org.apache.myfaces.shared.resource.ContractResourceLoader;
  import org.apache.myfaces.shared.resource.ResourceHandlerSupport;
  import org.apache.myfaces.shared.resource.ResourceLoader;
  
  /**
   *
   * @author lu4242
   */
  public class ViewResourceIterator implements Iterator<String>
  {
      private ResourceHandlerSupport support;
      private Deque<ResourceLoader> stack = new LinkedList<ResourceLoader>();
      private Deque<String> basePathStack = new LinkedList<String>();
      private Iterator<String> currentIterator = null;
      private String origBasePath;
      private int maxDepth;
      private ResourceVisitOption[] options;
      private FacesContext facesContext;
  
      /**
       * register a set 
       */
      private Set<String> pathSet;
  
      public ViewResourceIterator(FacesContext facesContext, ResourceHandlerSupport support, 
              String localePrefix, List<String> contracts, String contractPreferred, 
              String path, int maxDepth, ResourceVisitOption... options) 
      {
          this.support = support;
          this.origBasePath = path;
          this.maxDepth = maxDepth;
          this.options = options;
          this.facesContext = facesContext;
  
          String basePath = this.origBasePath.endsWith("/") ? this.origBasePath : this.origBasePath+"/";
          
          if (contractPreferred != null)
          {
              for (ContractResourceLoader loader : support.getContractResourceLoaders())
              {
                  if (localePrefix != null)
                  {
                      stack.add(loader);
                      basePathStack.add(basePath+localePrefix+"/"+contractPreferred);
                  }
                  stack.add(loader);
                  basePathStack.add(basePath+"/"+contractPreferred);
              }
          }
          if (!contracts.isEmpty())
          {
              for (ContractResourceLoader loader : support.getContractResourceLoaders())
              {
                  for (String contract : contracts)
                  {
                      if (localePrefix != null)
                      {
                          stack.add(loader);
                          basePathStack.add(basePath+localePrefix+"/"+contract);
                      }
                      stack.add(loader);
                      basePathStack.add(basePath+contract);
                  }
              }
          }
          
          for (ResourceLoader loader : support.getViewResourceLoaders())
          {
              if (localePrefix != null)
              {
                  stack.add(loader);
                 basePathStack.add(basePath+localePrefix);
             }
             stack.add(loader);
             basePathStack.add(basePath);
         }
     }
 
     @Override
     public boolean hasNext()
     {
         boolean next = false;
         do 
         {
             if (currentIterator == null)
             {
                 ResourceLoader loader = null;
                 String basePath = null;
                 do
                 {
                     do
                     {
                         loader = (ResourceLoader) stack.pop();
                         basePath = basePathStack.pop();
                         
                         if (loader != null)
                         {
                             currentIterator = loader.iterator(facesContext, basePath, maxDepth, options);
                         }
                     } 
                     while (currentIterator == null && !stack.isEmpty());
                     if (currentIterator != null)
                     {
                         boolean hasNext = currentIterator.hasNext();
                         if (!hasNext)
                         {
                             currentIterator = null;
                         }
                     }
                 }
                 while (currentIterator == null && !stack.isEmpty());
                 if (currentIterator == null)
                 {
                     return false;
                 }
             }
             next = currentIterator.hasNext();
             if (!next && !stack.isEmpty())
             {
                 currentIterator = null;
             }
         }
         while (currentIterator == null);
         return next;
     }
 
     @Override
     public String next()
     {
         if (hasNext())
         {
             if (currentIterator != null)
             {
                 return currentIterator.next();
             }
             else
             {
                 //Should not happen, return null
                 return null;
             }
         }
         else
         {
             return null;
         }
         /*
         if (currentIterator == null)
         {
             ResourceLoader loader = (ResourceLoader) stack.pop();
             if (loader != null)
             {
                 currentIterator = loader.iterator(facesContext, basePath, maxDepth, options);
             }
             else
             {
                 return null;
             }
         }
         return currentIterator.next();
         */
     }
 }