package fr.natan.akkastreamfileprocessingapi.service

import akka.Done
import akka.actor.ActorSystem
import akka.stream.scaladsl.{Sink, Source}
import com.typesafe.scalalogging.slf4j.Logger
import fr.natan.akkastreamfileprocessingapi.datasource.Datasource.{nameBasics, titleBasics, titlePrincipalsBasics}
import fr.natan.akkastreamfileprocessingapi.models.Models.{Person, TvSerie}
import fr.natan.akkastreamfileprocessingapi.models.ModelsBuilder.buildPersonModel
import fr.natan.akkastreamfileprocessingapi.service.AkkaStreamComponents.{buildAllPersonsSink, buildAllTvSeriesSink, buildAndValidateSource, buildPersonFlow, buildSource, buildTvSerieFlow, filterPersonByIdFlow, filterPersonByNameFlow, filterTvSerieByIdFlow, filterTvSerieByPrimaryTitleFlow}
import org.slf4j.LoggerFactory
import org.springframework.stereotype.Component

import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration.DurationInt
import scala.concurrent.{Await, Future}
import scala.language.postfixOps
import scala.util.{Failure, Success}

//noinspection SpellCheckingInspection
@Component
class AkkaStreamFileProcessingImpl extends AkkaStreamFileProcessing {

  implicit val actorSystem: ActorSystem = ActorSystem("AkkaStreamActor")
  implicit val logger: Logger = Logger(LoggerFactory.getLogger(this.getClass))

  override def getPersonById(personID: String): Future[Person] = {
    val source: Source[Map[String, String], _] = buildSource(inputFile = nameBasics)
    val res: Future[Person] = source
      .via(flow = filterPersonByIdFlow(personID = personID))
      .runWith(Sink.head)

    res.onComplete({
      case Failure(exception) => logger.info(s"$exception")
      case Success(value:Person) => logger.info(s"$value")
    })

    res
  }

  override def getPersonByName(primaryName: String): Future[Person] = {
    val source: Source[Map[String, String], _] = buildSource(inputFile = nameBasics)
    val persons: Future[Person] = source
      .via(flow = filterPersonByNameFlow(primaryName = primaryName))
      .runWith(Sink.head)

    persons.onComplete({
      case Failure(exception) => logger.error(s"$exception")
      case Success(value: Person) => logger.info(s"$value")
        logger.info("SUCCESS")
    })

    persons
  }

  override def getTvSerieById(tvSerieID: String): Future[TvSerie] = {
    val source: Source[Map[String, String], _] = buildSource(inputFile = titleBasics)
    val res: Future[TvSerie] = source
      .via(flow = filterTvSerieByIdFlow(tvSerieID = tvSerieID))
      .runWith(Sink.head)

    res.onComplete({
      case Failure(exception) => logger.info(s"$exception")
      case Success(value: TvSerie) => logger.info(s"$value")
    })
    res
  }
  override def getTvSerieByPrimaryTitle(tvSeriePrimaryTitle: String): List[TvSerie] = {

    val tvSeriesSource: Source[Map[String, String], _] = buildAndValidateSource(inputFile = titleBasics)

    val tvSries: Future[List[TvSerie]] = tvSeriesSource
      .via(flow = filterTvSerieByPrimaryTitleFlow(tvSeriePrimaryTitle = tvSeriePrimaryTitle))
      .runWith(Sink.collection)

    tvSries.onComplete({
      case Failure(exception) => logger.info(s"$exception")
      case Success(value: List[TvSerie]) =>
        value.foreach((tvSrie: TvSerie) => logger.info(s"$tvSrie"))
        logger.info("SUCCESS")
    })
    Await.result(tvSries,2 minutes)
    val tvSriesList : List[TvSerie] = tvSries.value.get.get
    tvSriesList
  }


  private def getTvSerieIdByPrimaryTitle(primaryTitle: String): Future[Option[String]] = {
    val source: Source[Map[String, String], _] = buildSource(inputFile = titleBasics)

    val res: Future[Option[String]] = source
      .filter((rowMap: Map[String, String]) => {
        rowMap.getOrElse(key = "primaryTitle", "") == primaryTitle
      })
      .map((rowMap: Map[String, String]) => rowMap.get("tconst"))
      .runWith(Sink.head)

    res
  }

  private def getListOfPersonsIDByTvSerieID(tvSerieIdFuture: Future[Option[String]]): Future[IndexedSeq[Option[String]]] = {
    val source: Source[Map[String, String], _] = buildSource(inputFile = titlePrincipalsBasics)
    val res: Future[IndexedSeq[Option[String]]] = source
      .filter((rowMaps: Map[String, String]) => {
        rowMaps.getOrElse(key = "tconst", default = "") == tvSerieIdFuture.value.get.get.get
      })
      .map((rowMap: Map[String, String]) => {
        rowMap.get(key = "nconst")
      })
      .runWith(Sink.collection)

    res
  }

  private def getListOfPersonsForTvSerie(listPersonsIDsFuture: Future[IndexedSeq[Option[String]]]):
  Future[IndexedSeq[Person]] = {

    val source: Source[Map[String, String], _] = buildSource(inputFile = nameBasics)
    val res: Future[IndexedSeq[Person]] = source
      .filter((rowMaps: Map[String, String]) => {
        listPersonsIDsFuture.value.get.get.contains(rowMaps.get(key = "nconst"))
      })
      .map((rowMap: Map[String, String]) => {
        buildPersonModel(rowMap)
      })
      .runWith(Sink.collection)

    res
  }

  override def getTeamOfPersonsForTvSerie(tvSeriePrimaryTitle: String): Future[IndexedSeq[Person]] = {

    //futures chaining
    logger.info("STEP 1/3 START")
    val tvSerieIDFuture: Future[Option[String]] = getTvSerieIdByPrimaryTitle(primaryTitle = tvSeriePrimaryTitle)

    val finalFuture: Future[IndexedSeq[Person]] =
      tvSerieIDFuture.andThen({
        case Failure(exception) => logger.error(s"$exception")
        case Success(value: Option[String]) =>
          logger.info(s"TvSerie ID: $value")
          logger.info("STEP 1/3 END")
      })
        .flatMap({
          _ =>
            logger.info("STEP 2/3 START")
            val listPersonIDsFuture: Future[IndexedSeq[Option[String]]] = getListOfPersonsIDByTvSerieID(tvSerieIdFuture = tvSerieIDFuture)
            listPersonIDsFuture.andThen({
              case Failure(exception) => logger.error(s"$exception")
              case Success(value) =>
                value.foreach((personID: Option[String]) => logger.info(s"Person ID:$personID"))
                logger.info("STEP 2/3 END")
            })
              .flatMap({
                future =>
                  logger.info("STEP 3/3 START")
                  val personsTeamFuture: Future[IndexedSeq[Person]] = getListOfPersonsForTvSerie(listPersonsIDsFuture = listPersonIDsFuture)
                  personsTeamFuture.andThen({
                    case Failure(exception) => logger.error(s"$exception")
                    case Success(value: IndexedSeq[Person]) =>
                      value.foreach((person: Person) => logger.info(s"${person.toString}"))
                      logger.info("STEP 3/3 END")
                  })
              })
        })

    finalFuture
  }

  override def getAllPersons(): Unit = {
    val personSource: Source[Map[String, String], _] = buildSource(inputFile = nameBasics)
    //graph
    val startTime: Long = System.currentTimeMillis()
    val result: Future[Done] = personSource
      .via(flow = buildPersonFlow())
      .runWith(sink = buildAllPersonsSink(logger = logger))

    result.onComplete {
      case Failure(exception) => logger.error(s"$exception")
      case Success(value) =>
        logger.info(s"$value")
        val time: Long = (System.currentTimeMillis() - startTime) / 100
        logger.info(s"elapsed time: $time")
    }
  }

  override def getAllTvSeries(): Unit = {
    val source: Source[Map[String, String], _] = buildAndValidateSource(inputFile = titleBasics)
    val sink: Sink[TvSerie, Future[Done]] = buildAllTvSeriesSink(logger = logger)

    val startingTime: Long = System.currentTimeMillis()
    //graph sink->flow->sink
    source
      .via(flow = buildTvSerieFlow())
      .runWith(sink = sink)
      .andThen {
        case Success(value) =>
          val elapsedTime: Long = (System.currentTimeMillis() - startingTime) / 1000
          logger.info(s"$value: successfully processing file, elapsed time $titleBasics: $elapsedTime sec")
        case Failure(error: Error) => logger.error(s"$error")
      }
  }
}