Replace old Overflow algorithm (#6280)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Chemistry/EntitySystems/SolutionContainerSystem.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using Content.Server.Chemistry.Components.SolutionManager;
+using Content.Server.Fluids.Components;
 using Content.Shared.Chemistry;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reaction;
@@ -213,17 +214,46 @@ namespace Content.Server.Chemistry.EntitySystems
         /// <summary>
         ///     Adds a solution to the container, if it can fully fit.
         /// </summary>
-        /// <param name="targetUid"></param>
-        /// <param name="targetSolution">The container to which we try to add.</param>
-        /// <param name="solution">The solution to try to add.</param>
+        /// <param name="targetUid">entity holding targetSolution</param>
+        ///  <param name="targetSolution">entity holding targetSolution</param>
+        /// <param name="addedSolution">solution being added</param>
         /// <returns>If the solution could be added.</returns>
-        public bool TryAddSolution(EntityUid targetUid, Solution? targetSolution, Solution solution)
+        public bool TryAddSolution(EntityUid targetUid, Solution? targetSolution, Solution addedSolution)
         {
-            if (targetSolution == null || !targetSolution.CanAddSolution(solution) || solution.TotalVolume == 0)
+            if (targetSolution == null
+                || !targetSolution.CanAddSolution(addedSolution) || targetSolution.TotalVolume == 0)
                 return false;
 
-            targetSolution.AddSolution(solution);
+            addedSolution.AddSolution(targetSolution);
+            UpdateChemicals(targetUid, addedSolution, true);
+            return true;
+        }
+
+        /// <summary>
+        ///     Adds a solution to the container, overflowing the rest.
+        ///     Unlike TryAddSolution it will ignore size limits.
+        /// </summary>
+        /// <param name="targetUid">entity holding targetSolution</param>
+        /// <param name="targetSolution">The container to which we try to add.</param>
+        /// <param name="addedSolution">solution being added</param>
+        /// <param name="overflowThreshold">After addition this much will be left in targetSolution</param>
+        /// <param name="overflowingSolution">Solution that exceeded overflowThreshold</param>
+        /// <returns></returns>
+        public bool TryMixAndOverflow(EntityUid targetUid, Solution targetSolution,
+            Solution addedSolution,
+            FixedPoint2 overflowThreshold,
+            [NotNullWhen(true)] out Solution? overflowingSolution)
+        {
+            if (addedSolution.TotalVolume == 0)
+            {
+                overflowingSolution = null;
+                return false;
+            }
+
+            targetSolution.AddSolution(addedSolution);
             UpdateChemicals(targetUid, targetSolution, true);
+            overflowingSolution = targetSolution.SplitSolution(FixedPoint2.Max(FixedPoint2.Zero,
+                targetSolution.CurrentVolume - overflowThreshold));
             return true;
         }
 
@@ -295,19 +325,6 @@ namespace Content.Server.Chemistry.EntitySystems
             return removedReagent;
         }
 
-        public void TryRemoveAllReagents(EntityUid uid, Solution solution, List<Solution.ReagentQuantity> removeReagents)
-        {
-            if (removeReagents.Count == 0)
-                return;
-
-            foreach (var reagent in removeReagents)
-            {
-                solution.RemoveReagent(reagent.ReagentId, reagent.Quantity);
-            }
-
-            UpdateChemicals(uid, solution);
-        }
-
         public FixedPoint2 GetReagentQuantity(EntityUid owner, string reagentId)
         {
             var reagentQuantity = FixedPoint2.New(0);

Content.Server/Chemistry/TileReactions/SpillIfPuddlePresentTileReaction.cs

@@ -1,5 +1,4 @@
-using Content.Server.Fluids.Components;
-using Content.Server.Fluids.EntitySystems;
+using Content.Server.Fluids.EntitySystems;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reaction;
 using Content.Shared.Chemistry.Reagent;

Content.Server/Destructible/Thresholds/Behaviors/SpillBehavior.cs

@@ -37,7 +37,7 @@ namespace Content.Server.Destructible.Thresholds.Behaviors
             else if (Solution != null &&
                      solutionContainerSystem.TryGetSolution(owner, Solution, out var behaviorSolution))
             {
-                spillableSystem.SpillAt(behaviorSolution, coordinates, "PuddleSmear", false);
+                spillableSystem.SpillAt(behaviorSolution, coordinates, "PuddleSmear");
             }
         }
     }

Content.Server/Fluids/Components/FluidSpreaderComponent.cs

@@ -0,0 +1,14 @@
+using Content.Server.Fluids.EntitySystems;
+using Content.Shared.Chemistry.Components;
+
+namespace Content.Server.Fluids.Components;
+
+[RegisterComponent]
+[Friend(typeof(FluidSpreaderSystem))]
+public sealed class FluidSpreaderComponent : Component
+{
+    [ViewVariables]
+    public Solution OverflownSolution = default!;
+
+    public bool Enabled { get; set; }
+}

Content.Server/Fluids/Components/PuddleComponent.cs

@@ -48,11 +48,6 @@ namespace Content.Server.Fluids.Components
         [DataField("spillSound")]
         public SoundSpecifier SpillSound = new SoundPathSpecifier("/Audio/Effects/Fluids/splat.ogg");
 
-        /// <summary>
-        /// Whether or not this puddle is currently overflowing onto its neighbors
-        /// </summary>
-        public bool Overflown;
-
         [ViewVariables(VVAccess.ReadOnly)]
         public FixedPoint2 CurrentVolume => EntitySystem.Get<PuddleSystem>().CurrentVolume(Owner);
 

Content.Server/Fluids/EntitySystems/FluidSpreaderSystem.cs

@@ -0,0 +1,208 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Content.Server.Chemistry.EntitySystems;
+using Content.Server.Fluids.Components;
+using Content.Shared.Chemistry.Components;
+using Content.Shared.Directions;
+using Content.Shared.FixedPoint;
+using Content.Shared.Physics;
+using JetBrains.Annotations;
+using Robust.Shared.Map;
+using Robust.Shared.Physics;
+using Robust.Shared.Utility;
+
+namespace Content.Server.Fluids.EntitySystems;
+
+[UsedImplicitly]
+public sealed class FluidSpreaderSystem : EntitySystem
+{
+    [Dependency] private readonly IMapManager _mapManager = default!;
+    [Dependency] private readonly PuddleSystem _puddleSystem = default!;
+    [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
+
+
+    private float _accumulatedTimeFrame;
+    private HashSet<EntityUid> _fluidSpread = new();
+
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<FluidSpreaderComponent, ComponentAdd>((uid, component, _) =>
+            FluidSpreaderAdd(uid, component));
+    }
+
+    public void AddOverflowingPuddle(PuddleComponent puddleComponent, Solution? solution = null)
+    {
+        var puddleSolution = solution;
+        if (puddleSolution == null && !_solutionContainerSystem.TryGetSolution(puddleComponent.Owner,
+                puddleComponent.SolutionName,
+                out puddleSolution)) return;
+
+        if (puddleSolution.CurrentVolume <= puddleComponent.OverflowVolume)
+            return;
+
+        var spreaderComponent = EntityManager.EnsureComponent<FluidSpreaderComponent>(puddleComponent.Owner);
+        spreaderComponent.OverflownSolution = puddleSolution;
+        spreaderComponent.Enabled = true;
+        FluidSpreaderAdd(spreaderComponent.Owner, spreaderComponent);
+    }
+
+    private void FluidSpreaderAdd(EntityUid uid, FluidSpreaderComponent component)
+    {
+        if (component.Enabled)
+            _fluidSpread.Add(uid);
+    }
+
+    public override void Update(float frameTime)
+    {
+        _accumulatedTimeFrame += frameTime;
+
+        if (!(_accumulatedTimeFrame >= 1.0f))
+            return;
+
+        _accumulatedTimeFrame -= 1.0f;
+
+        base.Update(frameTime);
+
+        var remQueue = new RemQueue<EntityUid>();
+        foreach (var uid in _fluidSpread)
+        {
+            MetaDataComponent? meta = null;
+
+            if (Paused(uid, meta))
+                continue;
+
+            // If not paused
+            // it's either Deleted or will be via SpreadFluid
+            remQueue.Add(uid);
+
+            if (Deleted(uid, meta))
+                continue;
+
+            SpreadFluid(uid);
+        }
+
+        foreach (var removeUid in remQueue)
+        {
+            _fluidSpread.Remove(removeUid);
+        }
+    }
+
+    private void SpreadFluid(EntityUid suid)
+    {
+        PuddleComponent? puddleComponent = null;
+        MetaDataComponent? metadataOriginal = null;
+        TransformComponent? transformOrig = null;
+        FluidSpreaderComponent? spreader = null;
+
+        if (!Resolve(suid, ref puddleComponent, ref metadataOriginal, ref transformOrig, ref spreader, false))
+            return;
+
+        var prototypeName = metadataOriginal.EntityPrototype!.ID;
+
+        var puddles = new List<PuddleComponent> { puddleComponent };
+        var visitedTiles = new HashSet<Vector2i>();
+
+        if (!_mapManager.TryGetGrid(transformOrig.GridID, out var mapGrid))
+            return;
+
+        while (puddles.Count > 0
+               && spreader.OverflownSolution.CurrentVolume > FixedPoint2.Zero)
+        {
+            var nextToExpand = new List<(Vector2i, EntityUid?)>();
+
+            var divided = spreader.OverflownSolution.CurrentVolume / puddles.Count;
+
+            foreach (var puddle in puddles)
+            {
+                if (puddle.CurrentVolume >= puddle.OverflowVolume) continue;
+
+                // -puddle.OverflowLeft is guaranteed to be >= 0
+                // iff puddle.CurrentVolume >= puddle.OverflowVolume
+                var split = FixedPoint2.Min(divided, -puddle.OverflowLeft);
+                _puddleSystem.TryAddSolution(
+                    puddle.Owner,
+                    spreader.OverflownSolution.SplitSolution(split),
+                    false, false, puddle);
+            }
+
+            // if solution is spent do not explore
+            if (spreader.OverflownSolution.CurrentVolume <= FixedPoint2.Zero)
+                continue;
+
+            // find edges
+            foreach (var puddle in puddles)
+            {
+                TransformComponent? transform = null;
+
+                if (!Resolve(puddle.Owner, ref transform, false))
+                    continue;
+
+                // prepare next set of puddles to be expanded
+                var puddlePos = transform.Coordinates.ToVector2i(EntityManager, _mapManager);
+                foreach (var direction in SharedDirectionExtensions.RandomDirections().ToArray())
+                {
+                    var newPos = puddlePos.Offset(direction);
+                    if (visitedTiles.Contains(newPos))
+                        continue;
+
+                    visitedTiles.Add(newPos);
+
+                    if (CanExpand(newPos, mapGrid, out var uid))
+                        nextToExpand.Add((newPos, uid));
+                }
+            }
+
+            puddles = new List<PuddleComponent>();
+
+            // prepare edges for next iteration
+            foreach (var (pos, uid) in nextToExpand)
+            {
+                if (spreader.OverflownSolution.CurrentVolume <= FixedPoint2.Zero)
+                    continue;
+
+                var puddleUid = uid!.Value;
+                var coordinate = mapGrid.GridTileToWorld(pos);
+                if (uid == EntityUid.Invalid)
+                {
+                    puddleUid = EntityManager.SpawnEntity(prototypeName, coordinate);
+                }
+
+                puddles.Add(EntityManager.GetComponent<PuddleComponent>(puddleUid));
+            }
+        }
+    }
+
+    private bool CanExpand(Vector2i newPos, IMapGrid mapGrid,
+        [NotNullWhen(true)] out EntityUid? uid)
+    {
+        if (!mapGrid.TryGetTileRef(newPos, out var tileRef)
+            || tileRef.Tile.IsEmpty)
+        {
+            uid = null;
+            return false;
+        }
+
+        foreach (var entity in mapGrid.GetAnchoredEntities(newPos))
+        {
+            IPhysBody? physics = null;
+            PuddleComponent? existingPuddle = null;
+
+            // This is an invalid location
+            if (Resolve(entity, ref physics, false)
+                && (physics.CollisionLayer & (int) CollisionGroup.Impassable) != 0)
+            {
+                uid = null;
+                return false;
+            }
+
+            if (!Resolve(entity, ref existingPuddle, false))
+                continue;
+
+            uid = entity;
+            return true;
+        }
+
+        uid = EntityUid.Invalid;
+        return true;
+    }
+}

Content.Server/Fluids/EntitySystems/PuddleSystem.cs

@@ -1,28 +1,12 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using System.Linq;
 using Content.Server.Chemistry.EntitySystems;
-using Content.Server.Construction.Components;
 using Content.Server.Fluids.Components;
 using Content.Shared.Chemistry.Components;
-using Content.Shared.Database;
-using Content.Shared.Directions;
 using Content.Shared.Examine;
 using Content.Shared.FixedPoint;
 using Content.Shared.Fluids;
-using Content.Shared.Maps;
-using Content.Shared.Physics;
 using Content.Shared.Slippery;
-using Content.Shared.Verbs;
 using JetBrains.Annotations;
 using Robust.Shared.Audio;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Localization;
-using Robust.Shared.Map;
-using Robust.Shared.Maths;
-using Robust.Shared.Physics;
 using Robust.Shared.Player;
 
 namespace Content.Server.Fluids.EntitySystems
@@ -30,8 +14,8 @@ namespace Content.Server.Fluids.EntitySystems
     [UsedImplicitly]
     public sealed class PuddleSystem : EntitySystem
     {
-        [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
+        [Dependency] private readonly FluidSpreaderSystem _fluidSpreaderSystem = default!;
 
         public override void Initialize()
         {
@@ -45,7 +29,7 @@ namespace Content.Server.Fluids.EntitySystems
 
         private void OnInit(EntityUid uid, PuddleComponent component, ComponentInit args)
         {
-            var solution =  _solutionContainerSystem.EnsureSolution(uid, component.SolutionName);
+            var solution = _solutionContainerSystem.EnsureSolution(uid, component.SolutionName);
             solution.MaxVolume = FixedPoint2.New(1000);
         }
 
@@ -111,21 +95,6 @@ namespace Content.Server.Fluids.EntitySystems
                 QueueDel(uid);
         }
 
-        /// <summary>
-        ///     Whether adding this solution to this puddle would overflow.
-        /// </summary>
-        /// <param name="uid">Uid of owning entity</param>
-        /// <param name="puddle">Puddle to which we are adding solution</param>
-        /// <param name="solution">Solution we intend to add</param>
-        /// <returns></returns>
-        public bool WouldOverflow(EntityUid uid, Solution solution, PuddleComponent? puddle = null)
-        {
-            if (!Resolve(uid, ref puddle))
-                return false;
-
-            return puddle.CurrentVolume + solution.TotalVolume > puddle.OverflowVolume;
-        }
-
         public bool EmptyHolder(EntityUid uid, PuddleComponent? puddleComponent = null)
         {
             if (!Resolve(uid, ref puddleComponent))
@@ -147,24 +116,40 @@ namespace Content.Server.Fluids.EntitySystems
                 : FixedPoint2.Zero;
         }
 
-        public bool TryAddSolution(EntityUid uid, Solution solution,
+        /// <summary>
+        ///
+        /// </summary>
+        /// <param name="puddleUid">Puddle to which we add</param>
+        /// <param name="addedSolution">Solution that is added to puddleComponent</param>
+        /// <param name="sound">Play sound on overflow</param>
+        /// <param name="checkForOverflow">Overflow on encountered values</param>
+        /// <param name="puddleComponent">Optional resolved PuddleComponent</param>
+        /// <returns></returns>
+        public bool TryAddSolution(EntityUid puddleUid,
+            Solution addedSolution,
             bool sound = true,
             bool checkForOverflow = true,
             PuddleComponent? puddleComponent = null)
         {
-            if (!Resolve(uid, ref puddleComponent))
+            if (!Resolve(puddleUid, ref puddleComponent))
                 return false;
 
-            if (solution.TotalVolume == 0 ||
+            if (addedSolution.TotalVolume == 0 ||
                 !_solutionContainerSystem.TryGetSolution(puddleComponent.Owner, puddleComponent.SolutionName,
                     out var puddleSolution))
             {
                 return false;
             }
 
-
             var result = _solutionContainerSystem
-                .TryAddSolution(puddleComponent.Owner, puddleSolution, solution);
+                .TryMixAndOverflow(puddleComponent.Owner, puddleSolution, addedSolution, puddleComponent.OverflowVolume,
+                    out var overflowSolution);
+
+            if (checkForOverflow && overflowSolution != null)
+            {
+                _fluidSpreaderSystem.AddOverflowingPuddle(puddleComponent, overflowSolution);
+            }
+
             if (!result)
             {
                 return false;
@@ -172,11 +157,6 @@ namespace Content.Server.Fluids.EntitySystems
 
             RaiseLocalEvent(puddleComponent.Owner, new SolutionChangedEvent());
 
-            if (checkForOverflow)
-            {
-                CheckOverflow(puddleComponent);
-            }
-
             if (!sound)
             {
                 return true;
@@ -188,139 +168,18 @@ namespace Content.Server.Fluids.EntitySystems
         }
 
         /// <summary>
-        /// Will overflow this entity to neighboring entities if required
+        ///     Whether adding this solution to this puddle would overflow.
         /// </summary>
-        private void CheckOverflow(PuddleComponent puddleComponent)
+        /// <param name="uid">Uid of owning entity</param>
+        /// <param name="puddle">Puddle to which we are adding solution</param>
+        /// <param name="solution">Solution we intend to add</param>
+        /// <returns></returns>
+        public bool WouldOverflow(EntityUid uid, Solution solution, PuddleComponent? puddle = null)
         {
-            if (puddleComponent.CurrentVolume <= puddleComponent.OverflowVolume
-                || puddleComponent.Overflown)
-                return;
-
-            var nextPuddles = new List<PuddleComponent>() { puddleComponent };
-            var overflownPuddles = new List<PuddleComponent>();
-
-            while (puddleComponent.OverflowLeft > FixedPoint2.Zero && nextPuddles.Count > 0)
-            {
-                foreach (var next in nextPuddles.ToArray())
-                {
-                    nextPuddles.Remove(next);
-
-                    next.Overflown = true;
-                    overflownPuddles.Add(next);
-
-                    var adjacentPuddles = GetAllAdjacentOverflow(next).ToArray();
-                    if (puddleComponent.OverflowLeft <= FixedPoint2.Epsilon * adjacentPuddles.Length)
-                    {
-                        break;
-                    }
-
-                    if (adjacentPuddles.Length == 0)
-                    {
-                        continue;
-                    }
-
-                    var numberOfAdjacent = FixedPoint2.New(adjacentPuddles.Length);
-                    var overflowSplit = puddleComponent.OverflowLeft / numberOfAdjacent;
-                    foreach (var adjacent in adjacentPuddles)
-                    {
-                        var adjacentPuddle = adjacent();
-                        var quantity = FixedPoint2.Min(overflowSplit, adjacentPuddle.OverflowVolume);
-                        var puddleSolution = _solutionContainerSystem.EnsureSolution(puddleComponent.Owner,
-                            puddleComponent.SolutionName);
-                        var spillAmount = _solutionContainerSystem.SplitSolution(puddleComponent.Owner,
-                            puddleSolution, quantity);
-
-                        TryAddSolution(adjacentPuddle.Owner, spillAmount, false, false);
-                        nextPuddles.Add(adjacentPuddle);
-                    }
-                }
-            }
-
-            foreach (var puddle in overflownPuddles)
-            {
-                puddle.Overflown = false;
-            }
-        }
-
-        /// <summary>
-        /// Finds or creates adjacent puddles in random directions from this one
-        /// </summary>
-        /// <returns>Enumerable of the puddles found or to be created</returns>
-        private IEnumerable<Func<PuddleComponent>> GetAllAdjacentOverflow(PuddleComponent puddleComponent)
-        {
-            foreach (var direction in SharedDirectionExtensions.RandomDirections())
-            {
-                if (TryGetAdjacentOverflow(puddleComponent, direction, out var puddle))
-                {
-                    yield return puddle;
-                }
-            }
-        }
-
-        /// <summary>
-        /// Tries to get an adjacent coordinate to overflow to, unless it is blocked by a wall on the
-        /// same tile or the tile is empty
-        /// </summary>
-        /// <param name="puddleComponent"></param>
-        /// <param name="direction">The direction to get the puddle from, respective to this one</param>
-        /// <param name="puddle">The puddle that was found or is to be created, or null if there
-        /// is a wall in the way</param>
-        /// <returns>true if a puddle was found or created, false otherwise</returns>
-        private bool TryGetAdjacentOverflow(PuddleComponent puddleComponent, Direction direction,
-            [NotNullWhen(true)] out Func<PuddleComponent>? puddle)
-        {
-            puddle = default;
-
-            // We're most likely in space, do nothing.
-            if (!EntityManager.GetComponent<TransformComponent>(puddleComponent.Owner).GridID.IsValid())
+            if (!Resolve(uid, ref puddle))
                 return false;
 
-            var mapGrid = _mapManager.GetGrid(EntityManager.GetComponent<TransformComponent>(puddleComponent.Owner).GridID);
-            var coords = EntityManager.GetComponent<TransformComponent>(puddleComponent.Owner).Coordinates;
-
-            if (!coords.Offset(direction).TryGetTileRef(out var tile))
-            {
-                return false;
-            }
-
-            // If space return early, let that spill go out into the void
-            if (tile.Value.Tile.IsEmpty)
-            {
-                return false;
-            }
-
-            if (!EntityManager.GetComponent<TransformComponent>(puddleComponent.Owner).Anchored)
-                return false;
-
-            foreach (var entity in mapGrid.GetInDir(coords, direction))
-            {
-                if (EntityManager.TryGetComponent(entity, out IPhysBody? physics) &&
-                    (physics.CollisionLayer & (int)CollisionGroup.Impassable) != 0)
-                {
-                    puddle = default;
-                    return false;
-                }
-
-                if (EntityManager.TryGetComponent(entity, out PuddleComponent? existingPuddle))
-                {
-                    if (existingPuddle.Overflown)
-                    {
-                        return false;
-                    }
-
-                    puddle = () => existingPuddle;
-                }
-            }
-
-            puddle ??= () =>
-            {
-                var id = EntityManager.SpawnEntity(
-                    EntityManager.GetComponent<MetaDataComponent>(puddleComponent.Owner).EntityPrototype?.ID,
-                    mapGrid.DirectionToGrid(coords, direction));
-                return EntityManager.GetComponent<PuddleComponent>(id);
-            };
-
-            return true;
+            return puddle.CurrentVolume + solution.TotalVolume > puddle.OverflowVolume;
         }
     }
 }

Content.Server/Fluids/EntitySystems/SpillableSystem.cs

@@ -3,7 +3,6 @@ using System.Linq;
 using Content.Server.Administration.Logs;
 using Content.Server.Chemistry.EntitySystems;
 using Content.Server.Clothing.Components;
-using Content.Server.Coordinates.Helpers;
 using Content.Server.Fluids.Components;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reagent;
@@ -13,17 +12,13 @@ using Content.Shared.Inventory.Events;
 using Content.Shared.Throwing;
 using Content.Shared.Verbs;
 using JetBrains.Annotations;
-using Robust.Server.GameObjects;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Localization;
 using Robust.Shared.Map;
 using Robust.Shared.Prototypes;
 
 namespace Content.Server.Fluids.EntitySystems;
 
 [UsedImplicitly]
-public class SpillableSystem : EntitySystem
+public sealed class SpillableSystem : EntitySystem
 {
     [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
     [Dependency] private readonly PuddleSystem _puddleSystem = default!;
@@ -61,7 +56,6 @@ public class SpillableSystem : EntitySystem
         // spill all solution on the player
         var drainedSolution = _solutionContainerSystem.Drain(uid, solution, solution.DrainAvailable);
         SpillAt(args.Equipee, drainedSolution, "PuddleSmear");
-
     }
 
     /// <summary>
@@ -174,10 +168,13 @@ public class SpillableSystem : EntitySystem
         if (!noTileReact)
         {
             // First, do all tile reactions
-            foreach (var (reagentId, quantity) in solution.Contents)
+            for (var i = 0; i < solution.Contents.Count; i++)
             {
+                var (reagentId, quantity) = solution.Contents[i];
                 var proto = _prototypeManager.Index<ReagentPrototype>(reagentId);
-                proto.ReactionTile(tileRef, quantity);
+                var removed = proto.ReactionTile(tileRef, quantity);
+                if (removed <= FixedPoint2.Zero) continue;
+                solution.RemoveReagent(reagentId, removed);
             }
         }
 
@@ -188,40 +185,34 @@ public class SpillableSystem : EntitySystem
         // Get normalized co-ordinate for spill location and spill it in the centre
         // TODO: Does SnapGrid or something else already do this?
         var spillGridCoords = mapGrid.GridTileToWorld(tileRef.GridIndices);
-
-        var spillEntities = _entityLookup.GetEntitiesIntersecting(mapGrid.ParentMapId, spillGridCoords.Position).ToArray();
-        foreach (var spillEntity in spillEntities)
-        {
-            if (_solutionContainerSystem.TryGetRefillableSolution(spillEntity, out var solutionContainerComponent))
-            {
-                _solutionContainerSystem.Refill(spillEntity, solutionContainerComponent,
-                    solution.SplitSolution(FixedPoint2.Min(
-                        solutionContainerComponent.AvailableVolume,
-                        solutionContainerComponent.MaxSpillRefill))
-                );
-            }
-        }
+        var startEntity = EntityUid.Invalid;
+        PuddleComponent? puddleComponent = null;
 
         if (combine)
         {
+            var spillEntities = _entityLookup.GetEntitiesIntersecting(tileRef).ToArray();
+
             foreach (var spillEntity in spillEntities)
             {
-                if (!EntityManager.TryGetComponent(spillEntity, out PuddleComponent? puddleComponent)) continue;
+                if (!EntityManager.TryGetComponent(spillEntity, out puddleComponent)) continue;
 
                 if (!overflow && _puddleSystem.WouldOverflow(puddleComponent.Owner, solution, puddleComponent))
                     return null;
 
-                if (!_puddleSystem.TryAddSolution(puddleComponent.Owner, solution, sound)) continue;
+                if (!_puddleSystem.TryAddSolution(puddleComponent.Owner, solution, sound, overflow)) continue;
 
-                return puddleComponent;
+                startEntity = puddleComponent.Owner;
+                break;
             }
         }
 
-        var puddleEnt = EntityManager.SpawnEntity(prototype, spillGridCoords);
-        var newPuddleComponent = EntityManager.GetComponent<PuddleComponent>(puddleEnt);
+        if (startEntity != EntityUid.Invalid)
+            return puddleComponent;
 
-        _puddleSystem.TryAddSolution(newPuddleComponent.Owner, solution, sound);
+        startEntity = EntityManager.SpawnEntity(prototype, spillGridCoords);
+        puddleComponent = EntityManager.EnsureComponent<PuddleComponent>(startEntity);
+        _puddleSystem.TryAddSolution(startEntity, solution, sound, overflow);
 
-        return newPuddleComponent;
+        return puddleComponent;
     }
 }