/*
    * 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.flow.util;
  
  import java.util.List;
  import javax.faces.context.FacesContext;
  import javax.faces.flow.Flow;
  import org.apache.myfaces.flow.FlowHandlerImpl;
  import org.apache.myfaces.flow.FlowReference;
  
  /**
   *
   */
  public class FlowUtils
  {
      public static String getFlowMapKey(FacesContext facesContext, FlowReference flowReference)
      {
          Flow flow = null;
          if (flowReference.getDocumentId() == null)
          {
              flow = facesContext.getApplication().getFlowHandler().getFlow(
                  facesContext, "", flowReference.getId());
          }
          else
          {
              flow = facesContext.getApplication().getFlowHandler().getFlow(
                  facesContext, flowReference.getDocumentId(), flowReference.getId());
          }
          if (flow != null)
          {
              return FlowUtils.getFlowMapKey(facesContext, flow);
          }
          return null;
      }    
      
      public static String getFlowMapKey(FacesContext facesContext, Flow flow)
      {
          String flowMapKey = flow.getClientWindowFlowId(
              facesContext.getExternalContext().getClientWindow());
          int flowIndex = getFlowIndex(facesContext, flow);
          if (flowIndex > 0)
          {
              flowMapKey = flowMapKey + "_" + flowIndex;
          }
          return flowMapKey;
      }
      
      private static int getFlowIndex(FacesContext facesContext, Flow flow)
      {
          List<Flow> list = FlowHandlerImpl.getActiveFlows(facesContext, 
                  facesContext.getApplication().getFlowHandler());
          FlowReference flowRef = new FlowReference(flow.getDefiningDocumentId(), flow.getId());
          int flowIndex = 0;
          for (Flow f : list)
          {
              FlowReference fr = new FlowReference(f.getDefiningDocumentId(), f.getId());
              if (flowRef.equals(fr))
              {
                  flowIndex++;
              }
          }
          return flowIndex;
      }
  
  }