show draw offers in analysis board - for #4800

modules/api/src/main/RoundApi.scala

@@ -204,15 +204,7 @@ final private[api] class RoundApi(
       obj: JsObject
   ) =
     obj + ("treeParts" -> partitionTreeJsonWriter.writes(
-      lila.round.TreeBuilder(
-        id = pov.gameId,
-        pgnMoves = pov.game.pgnMoves,
-        variant = pov.game.variant,
-        analysis = analysis,
-        initialFen = initialFen | pov.game.variant.initialFen,
-        withFlags = withFlags,
-        clocks = withFlags.clocks ?? pov.game.bothClockStates
-      )
+      lila.round.TreeBuilder(pov.game, analysis, initialFen | pov.game.variant.initialFen, withFlags)
     ))
 
   private def withSteps(pov: Pov, initialFen: Option[FEN])(obj: JsObject) =

modules/round/src/main/RoundDuct.scala

@@ -203,13 +203,10 @@ final private[round] class RoundDuct(
                 "analysis" -> lila.analyse.JsonView.bothPlayers(a.game, a.analysis),
                 "tree" -> lila.tree.Node.minimalNodeJsonWriter.writes {
                   TreeBuilder(
-                    id = a.analysis.id,
-                    pgnMoves = a.game.pgnMoves,
-                    variant = a.variant,
-                    analysis = a.analysis.some,
-                    initialFen = a.initialFen,
-                    withFlags = JsonView.WithFlags(),
-                    clocks = none
+                    a.game,
+                    a.analysis.some,
+                    a.initialFen,
+                    JsonView.WithFlags()
                   )
                 }
               )

modules/round/src/main/TreeBuilder.scala

@@ -1,6 +1,6 @@
 package lila.round
 
-import chess.Centis
+import chess.{ Centis, Color }
 import chess.format.pgn.Glyphs
 import chess.format.{ FEN, Forsyth, Uci, UciCharPair }
 import chess.opening._
@@ -26,32 +26,14 @@ object TreeBuilder {
       analysis: Option[Analysis],
       initialFen: FEN,
       withFlags: WithFlags
-  ): Root =
-    apply(
-      id = game.id,
-      pgnMoves = game.pgnMoves,
-      variant = game.variant,
-      analysis = analysis,
-      initialFen = initialFen,
-      withFlags = withFlags,
-      clocks = withFlags.clocks ?? game.bothClockStates
-    )
-
-  def apply(
-      id: String,
-      pgnMoves: Vector[String],
-      variant: Variant,
-      analysis: Option[Analysis],
-      initialFen: FEN,
-      withFlags: WithFlags,
-      clocks: Option[Vector[Centis]]
   ): Root = {
-    val withClocks: Option[Vector[Centis]] = withFlags.clocks ?? clocks
-    chess.Replay.gameMoveWhileValid(pgnMoves, initialFen, variant) match {
+    val withClocks: Option[Vector[Centis]] = withFlags.clocks ?? game.bothClockStates
+    val drawOfferPlies                     = game.drawOffers.normalizedPlies
+    chess.Replay.gameMoveWhileValid(game.pgnMoves, initialFen, game.variant) match {
       case (init, games, error) =>
-        error foreach logChessError(id)
+        error foreach logChessError(game.id)
         val openingOf: OpeningOf =
-          if (withFlags.opening && Variant.openingSensibleVariants(variant)) FullOpeningDB.findByFen
+          if (withFlags.opening && Variant.openingSensibleVariants(game.variant)) FullOpeningDB.findByFen
           else _ => None
         val fen                 = Forsyth >> init
         val infos: Vector[Info] = analysis.??(_.infos.toVector)
@@ -83,18 +65,18 @@ object TreeBuilder {
             eval = info map makeEval,
             glyphs = Glyphs.fromList(advice.map(_.judgment.glyph).toList),
             comments = Node.Comments {
-              advice.map(_.makeComment(withEval = false, withBestMove = true)).toList.map { text =>
-                Node.Comment(
-                  Node.Comment.Id.make,
-                  Node.Comment.Text(text),
-                  Node.Comment.Author.Lichess
-                )
-              }
+              drawOfferPlies(g.turns)
+                .option(makeLichessComment(s"${!Color.fromPly(g.turns)} offers draw"))
+                .toList :::
+                advice
+                  .map(_.makeComment(withEval = false, withBestMove = true))
+                  .toList
+                  .map(makeLichessComment)
             }
           )
           advices.get(g.turns + 1).flatMap { adv =>
             games.lift(index - 1).map { case (fromGame, _) =>
-              withAnalysisChild(id, branch, variant, Forsyth >> fromGame, openingOf)(adv.info)
+              withAnalysisChild(game.id, branch, game.variant, Forsyth >> fromGame, openingOf)(adv.info)
             }
           } getOrElse branch
         }
@@ -108,6 +90,13 @@ object TreeBuilder {
     }
   }
 
+  private def makeLichessComment(text: String) =
+    Node.Comment(
+      Node.Comment.Id.make,
+      Node.Comment.Text(text),
+      Node.Comment.Author.Lichess
+    )
+
   private def withAnalysisChild(
       id: String,
       root: Branch,