package mqttClient

import com.google.inject.Provides
import com.hivemq.client.mqtt.mqtt5.Mqtt5AsyncClient
import com.hivemq.client.mqtt.mqtt5.message.publish.Mqtt5Publish
import jakarta.inject.{Inject, Singleton}
import org.apache.pekko.actor.typed.{ActorRef, Behavior}
import org.apache.pekko.actor.typed.scaladsl.Behaviors
import play.api.Logging
import play.api.libs.concurrent.ActorModule
import play.api.libs.json._

import java.nio.charset.StandardCharsets
import scala.util.matching.Regex

object MessageProcessorActor extends ActorModule with Logging {
  sealed trait Command
  case object Stop extends Command
  private case class MqttMessageReceived(publish: Mqtt5Publish) extends Command

  override type Message = Command

  private final val newBidPattern: Regex = """notify/new_bid/(\w+)""".r

  @Singleton
  class Reg @Inject()(private val mqttMessageProcessorActor: ActorRef[Command])

  @Provides
  def create(client: Mqtt5AsyncClient, newBidService: services.auctions.NewBid): Behavior[Command] = Behaviors.setup { context =>
    client.connect().whenComplete { (_action, _throwable) =>
      client.subscribeWith()
        .topicFilter("notify/new_bid/+")
        .callback{ (publish) =>
          context.self ! MqttMessageReceived(publish)
        }
        .send()
    }

    Behaviors.receiveMessage[Command] {
      case MqttMessageReceived(publish) =>
        val topic = publish.getTopic
        val payload = String(publish.getPayloadAsBytes, StandardCharsets.UTF_8)
        logger.info(s"Received message $topic $payload")

        topic.toString match {
          case newBidPattern(auctionGid) =>
            Json.parse(payload).validate[services.auctions.NewBid.Request] match {
              case JsSuccess(request, _) => newBidService.perform(auctionGid, request)
              case JsError(errors) =>
                logger.warn(errors.toString())
            }
            println(s"New bid $auctionGid")
        }

        Behaviors.same
      case Stop => Behaviors.stopped{ () =>
        client.disconnect()
      }
    }
  }
}