/*
 * 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 spark.streaming.receivers

import spark.streaming.receivers._

import com.rabbitmq.client.ConnectionFactory
import com.rabbitmq.client.Channel
import com.rabbitmq.client.DefaultConsumer
import com.rabbitmq.client.Envelope
import com.rabbitmq.client.AMQP.BasicProperties

import com.thenewmotion.akka.rabbitmq._

import akka.actor.Actor
import akka.actor.ActorRef
import akka.actor.ActorSystem
import akka.actor.Props

import spark.Logging

/**
 * A receiver to subscribe to RabbitMQ stream.
 */
class RMQReceiver[T: ClassManifest](uname: String, passwd: String, vhost: String, host: String,  
  qname: String, topic: String )
  extends Actor with Receiver with Logging {

  implicit val system = ActorSystem()
  val factory = new ConnectionFactory()
  factory.setUsername(uname)
  factory.setPassword(passwd)
  factory.setVirtualHost(vhost)
  factory.setHost(host)

  override def preStart() = {
    val connectionActor = system.actorOf(Props(new ConnectionActor(factory)))
    def setupChannel(channel: Channel) {
      val result = channel.queueDeclare()
      val queue = result.getQueue()
      channel.queueBind(queue, qname, topic)
      val consumer = new DefaultConsumer(channel) {
        override def handleDelivery(consumerTag: String, envelope: Envelope, properties: BasicProperties,
         body: Array[Byte]) {
          pushBlock(fromBytes(body))
        }
      }
      channel.basicConsume(queue, true, consumer)
    }
    val channelActor: ActorRef = connectionActor.createChannel(Props(new ChannelActor(setupChannel)))
  }

  def fromBytes(x: Array[Byte]) = new String(x, "UTF-8")

  def receive: Receive = {
    case _      ⇒ logInfo("unknown mwssage")
  }
}