download random finished game API WIP

app/controllers/Export.scala

@@ -34,6 +34,10 @@ object Export extends LilaController {
     }
   }
 
+  def random = Action.async {
+    Ok.fuccess
+  }
+
   def pdf(id: String) = Open { implicit ctx =>
     OnlyHumans {
       OptionResult(GameRepo game id) { game =>

conf/routes

@@ -250,6 +250,7 @@ POST  /$gameId<\w{8}>/request-analysis        controllers.Analyse.requestAnalysi
 GET   /game/export/$gameId<\w{8}>.pgn         controllers.Export.pgn(gameId: String)
 GET   /game/export/pdf/$gameId<\w{8}>.pdf     controllers.Export.pdf(gameId: String)
 GET   /game/export/png/$gameId<\w{8}>.png     controllers.Export.png(gameId: String)
+GET   /game/export/png/random.png             controllers.Export.random
 
 # Fishnet
 POST  /fishnet/acquire                        controllers.Fishnet.acquire

modules/game/src/main/GameRepo.scala

@@ -241,11 +241,19 @@ object GameRepo {
   }
 
   def findRandomStandardCheckmate(distribution: Int): Fu[Option[Game]] = coll.find(
-    Query.mate ++ $doc("v" $exists false)
+    Query.mate ++ Query.variantStandard
   ).sort(Query.sortCreated)
     .skip(Random nextInt distribution)
     .uno[Game]
 
+  def randomFinished(distribution: Int): Fu[Option[Game]] = coll.find(
+    Query.finished ++ Query.rated ++
+      Query.variantStandard ++ Query.bothRatingsGreaterThan(1600)
+  ).sort(Query.sortCreated)
+    .skip(Random nextInt distribution)
+    .cursor[Game](ReadPreference.secondary)
+    .uno
+
   def insertDenormalized(g: Game, ratedCheck: Boolean = true, initialFen: Option[chess.format.FEN] = None): Funit = {
     val g2 = if (ratedCheck && g.rated && g.userIds.distinct.size != 2)
       g.copy(mode = chess.Mode.Casual)

modules/game/src/main/Query.scala

@@ -87,6 +87,8 @@ object Query {
   def variant(v: chess.variant.Variant) =
     $doc(F.variant -> v.standard.fold[BSONValue]($exists(false), $int(v.id)))
 
+  lazy val  variantStandard = variant(chess.variant.Standard)
+
   lazy val notHordeOrSincePawnsAreWhite: Bdoc = $or(
     F.variant $ne chess.variant.Horde.id,
     sinceHordePawnsAreWhite