RCD and tile placement fixes (#21132)

Content.Shared/RCD/Systems/RCDSystem.cs

@@ -11,6 +11,7 @@ using Content.Shared.Physics;
 using Content.Shared.Popups;
 using Content.Shared.RCD.Components;
 using Content.Shared.Tag;
+using Content.Shared.Tiles;
 using Robust.Shared.Audio;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
@@ -22,17 +23,19 @@ namespace Content.Shared.RCD.Systems;
 
 public sealed class RCDSystem : EntitySystem
 {
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IMapManager _mapMan = default!;
+    [Dependency] private readonly INetManager _net = default!;
     [Dependency] private readonly ISharedAdminLogManager _adminLogger = default!;
+    [Dependency] private readonly ITileDefinitionManager _tileDefMan = default!;
+    [Dependency] private readonly FloorTileSystem _floors = default!;
     [Dependency] private readonly SharedAudioSystem _audio = default!;
     [Dependency] private readonly SharedChargesSystem _charges = default!;
     [Dependency] private readonly SharedDoAfterSystem _doAfter = default!;
     [Dependency] private readonly SharedInteractionSystem _interaction = default!;
-    [Dependency] private readonly IMapManager _mapMan = default!;
-    [Dependency] private readonly INetManager _net = default!;
+    [Dependency] private readonly SharedMapSystem _mapSystem = default!;
     [Dependency] private readonly SharedPopupSystem _popup = default!;
     [Dependency] private readonly TagSystem _tag = default!;
-    [Dependency] private readonly ITileDefinitionManager _tileDefMan = default!;
-    [Dependency] private readonly IGameTiming _timing = default!;
     [Dependency] private readonly TurfSystem _turf = default!;
 
     private readonly int RcdModeCount = Enum.GetValues(typeof(RcdMode)).Length;
@@ -156,10 +159,17 @@ public sealed class RCDSystem : EntitySystem
         var tile = mapGrid.GetTileRef(location);
         var snapPos = mapGrid.TileIndicesFor(location);
 
+        // I love that this uses entirely separate code to construction and tile placement!!!
+
         switch (comp.Mode)
         {
             //Floor mode just needs the tile to be a space tile (subFloor)
             case RcdMode.Floors:
+                if (!_floors.CanPlaceTile(gridId.Value, mapGrid, out var reason))
+                {
+                    _popup.PopupClient(reason, user, user);
+                    return;
+                }
 
                 mapGrid.SetTile(snapPos, new Tile(_tileDefMan[comp.Floor].TileId));
                 _adminLogger.Add(LogType.RCD, LogImpact.High, $"{ToPrettyString(args.User):user} used RCD to set grid: {tile.GridUid} {snapPos} to {comp.Floor}");

Content.Shared/Tiles/FloorTileSystem.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Numerics;
 using Content.Shared.Administration.Logs;
@@ -123,14 +124,10 @@ public sealed class FloorTileSystem : EntitySystem
             if (mapGrid != null)
             {
                 var gridUid = mapGrid.Owner;
-                var ev = new FloorTileAttemptEvent();
-                RaiseLocalEvent(mapGrid);
 
-                if (HasComp<ProtectedGridComponent>(gridUid) || ev.Cancelled)
+                if (!CanPlaceTile(gridUid, mapGrid, out var reason))
                 {
-                    if (_netManager.IsClient && _timing.IsFirstTimePredicted)
-                        _popup.PopupEntity(Loc.GetString("invalid-floor-placement"), args.User);
-
+                    _popup.PopupClient(reason, args.User, args.User);
                     return;
                 }
 
@@ -177,9 +174,25 @@ public sealed class FloorTileSystem : EntitySystem
     {
         _adminLogger.Add(LogType.Tile, LogImpact.Low, $"{ToPrettyString(user):actor} placed tile {_tileDefinitionManager[tileId].Name} at {ToPrettyString(gridUid)} {location}");
 
-        var variant = ((ContentTileDefinition) _tileDefinitionManager[tileId]).PickVariant();
+        // TODO: Proper predicted RNG.
+        var variant = (byte) (_timing.CurTick.Value % ((ContentTileDefinition) _tileDefinitionManager[tileId]).Variants);
         mapGrid.SetTile(location.Offset(new Vector2(offset, offset)), new Tile(tileId, 0, variant));
 
         _audio.PlayPredicted(placeSound, location, user, AudioHelpers.WithVariation(0.125f, _random));
     }
+
+    public bool CanPlaceTile(EntityUid gridUid, MapGridComponent component, [NotNullWhen(false)] out string? reason)
+    {
+        var ev = new FloorTileAttemptEvent();
+        RaiseLocalEvent(gridUid, ref ev);
+
+        if (HasComp<ProtectedGridComponent>(gridUid) || ev.Cancelled)
+        {
+            reason = Loc.GetString("invalid-floor-placement");
+            return false;
+        }
+
+        reason = null;
+        return true;
+    }
 }