InsightApi.scala

package lila.insight

import lila.game.{ Game, GameRepo, Pov }
import lila.user.User
import org.joda.time.DateTime

final class InsightApi(
    storage: Storage,
    pipeline: AggregationPipeline,
    insightUserApi: InsightUserApi,
    gameRepo: GameRepo,
    indexer: InsightIndexer
)(implicit ec: scala.concurrent.ExecutionContext) {

  import InsightApi._

  def insightUser(user: User): Fu[InsightUser] =
    insightUserApi find user.id flatMap {
      case Some(u) =>
        u.lastSeen.isBefore(DateTime.now minusDays 1) ?? {
          insightUserApi setSeenNow user
        } inject u
      case None =>
        for {
          count <- storage count user.id
          ecos  <- storage ecos user.id
          c = InsightUser.make(user.id, count, ecos)
          _ <- insightUserApi save c
        } yield c
    }

  def ask[X](question: Question[X], user: User): Fu[Answer[X]] =
    pipeline
      .aggregate(question, user)
      .flatMap { aggDocs =>
        val clusters = AggregationClusters(question, aggDocs)
        val gameIds  = lila.common.ThreadLocalRandom.shuffle(clusters.flatMap(_.gameIds)) take 4
        gameRepo.userPovsByGameIds(gameIds, user) map { povs =>
          Answer(question, clusters, povs)
        }
      }
      .monSuccess(_.insight.request)

  def userStatus(user: User): Fu[UserStatus] =
    gameRepo lastFinishedRatedNotFromPosition user flatMap {
      case None => fuccess(UserStatus.NoGame)
      case Some(game) =>
        storage fetchLast user.id map {
          case None                                              => UserStatus.Empty
          case Some(entry) if entry.date isBefore game.createdAt => UserStatus.Stale
          case _                                                 => UserStatus.Fresh
        }
    }

  def indexAll(userId: User.ID) =
    indexer
      .all(userId)
      .monSuccess(_.insight.index) >>
      insightUserApi.remove(userId)

  def updateGame(g: Game) =
    Pov(g)
      .map { pov =>
        pov.player.userId ?? { userId =>
          storage find InsightEntry.povToId(pov) flatMap {
            _ ?? { old =>
              indexer.update(g, userId, old)
            }
          }
        }
      }
      .sequenceFu
      .void
}

object InsightApi {

  sealed trait UserStatus
  object UserStatus {
    case object NoGame extends UserStatus // the user has no rated games
    case object Empty  extends UserStatus // insights not yet generated
    case object Stale  extends UserStatus // new games not yet generated
    case object Fresh  extends UserStatus // up to date
  }
}