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/*
 * 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.proton.plug.context.client;

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.PooledByteBufAllocator;
import org.apache.qpid.proton.amqp.messaging.Accepted;
import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Receiver;
import org.apache.qpid.proton.message.ProtonJMessage;
import org.apache.qpid.proton.message.impl.MessageImpl;
import org.proton.plug.AMQPClientReceiverContext;
import org.proton.plug.AMQPSessionCallback;
import org.proton.plug.context.AbstractConnectionContext;
import org.proton.plug.context.AbstractProtonReceiverContext;
import org.proton.plug.context.AbstractProtonSessionContext;
import org.proton.plug.exceptions.ActiveMQAMQPException;

import static org.proton.plug.util.DeliveryUtil.readDelivery;
import static org.proton.plug.util.DeliveryUtil.decodeMessageImpl;

public class ProtonClientReceiverContext extends AbstractProtonReceiverContext implements AMQPClientReceiverContext {

   public ProtonClientReceiverContext(AMQPSessionCallback sessionSPI,
                                      AbstractConnectionContext connection,
                                      AbstractProtonSessionContext protonSession,
                                      Receiver receiver) {
      super(sessionSPI, connection, protonSession, receiver);
   }

   @Override
   public void onFlow(int credits, boolean drain) {
   }

   LinkedBlockingDeque queues = new LinkedBlockingDeque<>();

   /*
   * called when Proton receives a message to be delivered via a Delivery.
   *
   * This may be called more than once per deliver so we have to cache the buffer until we have received it all.
   *
   * */
   @Override
   public void onMessage(Delivery delivery) throws ActiveMQAMQPException {
      ByteBuf buffer = PooledByteBufAllocator.DEFAULT.heapBuffer(1024);
      try {
         synchronized (connection.getLock()) {
            readDelivery(receiver, buffer);
            MessageImpl clientMessage = decodeMessageImpl(buffer);

            // This second method could be better
            //            clientMessage.decode(buffer.nioBuffer());

            receiver.advance();
            delivery.disposition(Accepted.getInstance());
            queues.add(clientMessage);

         }
      }
      finally {
         buffer.release();
      }
   }

   @Override
   public ProtonJMessage receiveMessage(int time, TimeUnit unit) throws Exception {
      return queues.poll(time, unit);
   }

   @Override
   public void flow(int credits) {
      flow(credits, Integer.MAX_VALUE);
   }

}