PlaybanApi.scala

package lila.playban

import reactivemongo.bson._

import chess.{ Status, Color }
import lila.common.PlayApp.{ startedSinceMinutes, isDev }
import lila.db.BSON._
import lila.db.dsl._
import lila.game.{ Pov, Game, Player, Source }
import lila.user.{ User, UserRepo }

final class PlaybanApi(
    coll: Coll,
    sandbag: SandbagWatch,
    feedback: PlaybanFeedback,
    bus: lila.common.Bus
) {

  import lila.db.BSON.BSONJodaDateTimeHandler
  import reactivemongo.bson.Macros
  private implicit val OutcomeBSONHandler = new BSONHandler[BSONInteger, Outcome] {
    def read(bsonInt: BSONInteger): Outcome = Outcome(bsonInt.value) err s"No such playban outcome: ${bsonInt.value}"
    def write(x: Outcome) = BSONInteger(x.id)
  }
  private implicit val banBSONHandler = Macros.handler[TempBan]
  private implicit val UserRecordBSONHandler = Macros.handler[UserRecord]

  private case class Blame(player: Player, outcome: Outcome)

  private val blameableSources: Set[Source] = Set(Source.Lobby, Source.Pool, Source.Tournament)

  private def blameable(game: Game): Fu[Boolean] =
    (game.source.exists(s => blameableSources(s)) && game.hasClock) ?? {
      if (game.rated) fuTrue
      else UserRepo.containsEngine(game.userIds) map (!_)
    }

  private def IfBlameable[A: ornicar.scalalib.Zero](game: Game)(f: => Fu[A]): Fu[A] =
    (isDev || startedSinceMinutes(10)) ?? {
      blameable(game) flatMap { _ ?? f }
    }

  def abort(pov: Pov, isOnGame: Set[Color]): Funit = IfBlameable(pov.game) {
    pov.player.userId.ifTrue(isOnGame(pov.opponent.color)) ?? { userId =>
      save(Outcome.Abort, userId) >>- feedback.abort(pov)
    }
  }

  def noStart(pov: Pov): Funit = IfBlameable(pov.game) {
    pov.player.userId ?? { userId =>
      save(Outcome.NoPlay, userId) >>- feedback.noStart(pov)
    }
  }

  def rageQuit(game: Game, quitterColor: Color): Funit =
    sandbag(game, quitterColor) >> IfBlameable(game) {
      game.player(quitterColor).userId ?? { userId =>
        save(Outcome.RageQuit, userId) >>- feedback.rageQuit(Pov(game, quitterColor))
      }
    }

  def flag(game: Game, flaggerColor: Color): Funit = {

    def unreasonableTime = game.clock map { c =>
      (c.estimateTotalSeconds / 12) atLeast 15 atMost (3 * 60)
    }

    // flagged after waiting a long time
    def sitting = for {
      userId <- game.player(flaggerColor).userId
      seconds = nowSeconds - game.movedAt.getSeconds
      limit <- unreasonableTime
      if seconds >= limit
    } yield save(Outcome.Sitting, userId) >>- feedback.sitting(Pov(game, flaggerColor))

    // flagged after waiting a short time;
    // but the previous move used a long time.
    // assumes game was already checked for sitting
    def sitMoving = for {
      userId <- game.player(flaggerColor).userId
      movetimes <- game moveTimes flaggerColor
      lastMovetime <- movetimes.lastOption
      limit <- unreasonableTime
      if lastMovetime.toSeconds >= limit
    } yield save(Outcome.SitMoving, userId) >>- feedback.sitting(Pov(game, flaggerColor))

    sandbag(game, flaggerColor) flatMap { isSandbag =>
      IfBlameable(game) {
        sitting orElse
          sitMoving getOrElse
          goodOrSandbag(game, flaggerColor, isSandbag)
      }
    }
  }

  def other(game: Game, status: Status.type => Status, winner: Option[Color]): Funit =
    winner.?? { w => sandbag(game, !w) } flatMap { isSandbag =>
      IfBlameable(game) {
        ~(for {
          w <- winner
          loserId <- game.player(!w).userId
        } yield {
          if (Status.NoStart is status) save(Outcome.NoPlay, loserId) >>- feedback.noStart(Pov(game, !w))
          else goodOrSandbag(game, !w, isSandbag)
        })
      }
    }

  private def goodOrSandbag(game: Game, color: Color, isSandbag: Boolean): Funit =
    game.player(color).userId ?? { userId =>
      if (isSandbag) feedback.sandbag(Pov(game, color))
      save(if (isSandbag) Outcome.Sandbag else Outcome.Good, userId)
    }

  def currentBan(userId: User.ID): Fu[Option[TempBan]] = coll.find(
    $doc("_id" -> userId, "b.0" $exists true),
    $doc("_id" -> false, "b" -> $doc("$slice" -> -1))
  ).uno[Bdoc].map {
      _.flatMap(_.getAs[List[TempBan]]("b")).??(_.find(_.inEffect))
    }

  def hasCurrentBan(userId: User.ID): Fu[Boolean] = currentBan(userId).map(_.isDefined)

  def completionRate(userId: User.ID): Fu[Option[Double]] =
    coll.primitiveOne[List[Outcome]]($id(userId), "o").map(~_) map { outcomes =>
      outcomes.collect {
        case Outcome.RageQuit | Outcome.Sitting | Outcome.NoPlay => false
        case Outcome.Good => true
      } match {
        case c if c.size >= 5 => Some(c.count(identity).toDouble / c.size)
        case _ => none
      }
    }

  def bans(userId: User.ID): Fu[List[TempBan]] =
    coll.primitiveOne[List[TempBan]]($doc("_id" -> userId, "b.0" $exists true), "b").map(~_)

  def bans(userIds: List[User.ID]): Fu[Map[User.ID, Int]] = coll.find(
    $inIds(userIds),
    $doc("b" -> true)
  ).cursor[Bdoc]().gather[List]().map {
      _.flatMap { obj =>
        obj.getAs[User.ID]("_id") flatMap { id =>
          obj.getAs[Barr]("b") map { id -> _.stream.size }
        }
      }(scala.collection.breakOut)
    }

  private def save(outcome: Outcome, userId: User.ID): Funit = {
    lila.mon.playban.outcome(outcome.key)()
    coll.findAndUpdate(
      selector = $id(userId),
      update = $doc("$push" -> $doc(
        "o" -> $doc(
          "$each" -> List(outcome),
          "$slice" -> -30
        )
      )),
      fetchNewObject = true,
      upsert = true
    ).map(_.value)
  } map2 UserRecordBSONHandler.read flatMap {
    case None => fufail(s"can't find record for user $userId")
    case _ if outcome == Outcome.Good => funit
    case Some(record) => legiferate(record)
  } logFailure lila.log("playban")

  private def legiferate(record: UserRecord): Funit = record.bannable ?? { ban =>
    (!record.banInEffect) ?? {
      lila.mon.playban.ban.count()
      lila.mon.playban.ban.mins(ban.mins)
      bus.publish(lila.hub.actorApi.playban.Playban(record.userId, ban.mins), 'playban)
      coll.update(
        $id(record.userId),
        $unset("o") ++
          $push(
            "b" -> $doc(
              "$each" -> List(ban),
              "$slice" -> -30
            )
          )
      ).void
    }

  }
}