/*
    * 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.push.cdi;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import javax.enterprise.context.ApplicationScoped;
  
  /**
   *
   */
  @ApplicationScoped
  public class WebsocketApplicationBean
  {
      
      /**
       * This map has as key the channel and as values a list of websocket channels
       */
      private Map<String, List<WebsocketChannel> > channelTokenListMap = 
          new HashMap<String, List<WebsocketChannel> >(2);
  
      public void registerWebsocketSession(String token, WebsocketChannelMetadata metadata)
      {
          if ("application".equals(metadata.getScope()))
          {
              channelTokenListMap.putIfAbsent(metadata.getChannel(), new ArrayList<WebsocketChannel>(1));
              channelTokenListMap.get(metadata.getChannel()).add(new WebsocketChannel(
                      token, metadata));
          }
      }
      
      /**
       * Indicate if the channel mentioned is valid for view scope.
       * 
       * A channel is valid if there is at least one token that represents a valid connection to this channel.
       * 
       * @param channel
       * @return 
       */
      public boolean isChannelAvailable(String channel)
      {
          return channelTokenListMap.containsKey(channel);
      }
      
      public List<String> getChannelTokensFor(String channel)
      {
          List<WebsocketChannel> list = channelTokenListMap.get(channel);
          if (list != null && !list.isEmpty())
          {
              List<String> value = new ArrayList<String>(list.size());
              for (WebsocketChannel md : list)
              {
                  value.add(md.getChannelToken());
              }
              return value;
          }
          return Collections.emptyList();
      }
      
      public <S extends Serializable> List<String> getChannelTokensFor(String channel, S user)
      {
          List<WebsocketChannel> list = channelTokenListMap.get(channel);
          if (list != null && !list.isEmpty())
          {
              List<String> value = new ArrayList<String>(list.size());
              for (WebsocketChannel md : list)
              {
                  if (user.equals(md.getUser()))
                  {
                      value.add(md.getChannelToken());
                  }
              }
              return value;
          }
          return null;
      }
  }