/*
    * Copyright 2016 The Lannister Project
    * 
    * Licensed 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 net.anyflow.lannister.packetreceiver;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.mqtt.MqttMessage;
  import net.anyflow.lannister.message.InboundMessageStatus;
  import net.anyflow.lannister.session.Session;
  import net.anyflow.lannister.topic.Topic;
  import net.anyflow.lannister.topic.Topics.ClientType;
  
  public class PubRelReceiver {
  	private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PubRelReceiver.class);
  
  	public static final PubRelReceiver SHARED = new PubRelReceiver();
  
  	private PubRelReceiver() {
  	}
  
  	protected void handle(ChannelHandlerContext ctx, Session session, int messageId) {
  
  		// TODO what if the PUBREL is resented one?
  
  		Topic topic = Topic.NEXUS.get(session.clientId(), messageId, ClientType.PUBLISHER);
  		if (topic == null) {
  			logger.error("PUBREL target does not exist [clientId={}, messageId={}]", session.clientId(), messageId);
  			session.dispose(true); // [MQTT-3.3.5-2]
  			return;
  		}
  
  		MqttMessage toSend = MqttMessageFactory.pubcomp(messageId);
  		final String log = toSend.toString();
  
  		session.send(toSend, f -> {
  			if (!f.isSuccess()) {
  				logger.error("packet outgoing failed [{}] {}", log, f.cause());
  				return;
  			}
  
  			InboundMessageStatus.NEXUS.removeByKey(messageId, session.clientId());
  			logger.debug("Inbound message status REMOVED [clientId={}, messageId={}]", session.clientId(), messageId);
  		});
  	}
  }