/*
    * 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.tobago.util;
  
  import javax.faces.application.Application;
  import javax.faces.application.NavigationHandler;
  import javax.faces.context.FacesContext;
  import javax.servlet.ServletRequest;
  import javax.servlet.http.HttpServletRequest;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  public class AjaxUtils {
  
    public static boolean isAjaxRequest(final FacesContext facesContext) {
      return facesContext.getPartialViewContext().isAjaxRequest();
    }
  
    public static boolean isAjaxRequest(final ServletRequest request) {
      String requestType = null;
      if (request instanceof HttpServletRequest) {
        final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        requestType = httpServletRequest.getHeader("Faces-Request");
      }
      return "partial/ajax".equalsIgnoreCase(requestType)
          || "true".equalsIgnoreCase(request.getParameter("javax.faces.partial.ajax"));
    }
  
    public static void addRenderIds(final String... renderIds) {
      addRenderIds(FacesContext.getCurrentInstance(), renderIds);
    }
  
    public static void addRenderIds(final FacesContext facesContext, final String... renderIds) {
      Collections.addAll(facesContext.getPartialViewContext().getRenderIds(), renderIds);
    }
  
    public static void removeRenderIds(final String... renderIds) {
      removeRenderIds(FacesContext.getCurrentInstance(), renderIds);
    }
  
    public static void removeRenderIds(final FacesContext facesContext, final String... renderIds) {
      final Collection<String> collection = facesContext.getPartialViewContext().getRenderIds();
      for (final String renderId : renderIds) {
        collection.remove(renderId);
      }
    }
  
    public static Set<String> getRenderIds(final FacesContext facesContext) {
      return new HashSet<>(facesContext.getPartialViewContext().getRenderIds());
    }
  
    public static void navigate(final FacesContext facesContext, final Object outcome) {
      final Application application = facesContext.getApplication();
      final NavigationHandler navigationHandler = application.getNavigationHandler();
      navigationHandler.handleNavigation(facesContext, null, outcome.toString());
      facesContext.renderResponse();
    }
  }