Split simulation models

2026-05-10 18:03:46 +02:00
parent a0b10423ac
commit 1aa9734e08
40 changed files with 616 additions and 558 deletions
--- a/src/ReactorMaintenance.Simulation/GridPositionExtensions.cs
+++ b/src/ReactorMaintenance.Simulation/GridPositionExtensions.cs
@@ -0,0 +1,17 @@
+namespace ReactorMaintenance.Simulation;
+
+public static class GridPositionExtensions
+{
+    public static IEnumerable<GridPosition> Neighbors(this GridPosition position)
+    {
+        yield return new(position.X, position.Y - 1);
+        yield return new(position.X + 1, position.Y);
+        yield return new(position.X, position.Y + 1);
+        yield return new(position.X - 1, position.Y);
+    }
+
+    public static int ManhattanDistance(this GridPosition position, GridPosition other)
+    {
+        return Math.Abs(position.X - other.X) + Math.Abs(position.Y - other.Y);
+    }
+}
--- a/src/ReactorMaintenance.Simulation/LevelStateExtensions.cs
+++ b/src/ReactorMaintenance.Simulation/LevelStateExtensions.cs
@@ -0,0 +1,116 @@
+namespace ReactorMaintenance.Simulation;
+
+public static class LevelStateExtensions
+{
+    public static bool InBounds(this LevelState level, GridPosition position)
+    {
+        return position.X >= 0 && position.Y >= 0 && position.X < level.Width && position.Y < level.Height;
+    }
+
+    public static int Index(this LevelState level, GridPosition position)
+    {
+        if (!level.InBounds(position))
+            throw new ArgumentOutOfRangeException(nameof(position), $"Position {position.X},{position.Y} is outside {level.Width}x{level.Height}.");
+
+        return position.Y * level.Width + position.X;
+    }
+
+    public static ECellTerrain GetTerrain(this LevelState level, GridPosition position)
+    {
+        return level.Terrain[level.Index(position)];
+    }
+
+    public static UndergroundCell GetUnderground(this LevelState level, GridPosition position, ECarrierType carrier)
+    {
+        return level.Layer(carrier)[level.Index(position)];
+    }
+
+    public static SurfaceState GetSurface(this LevelState level, GridPosition position)
+    {
+        return level.Surface[level.Index(position)];
+    }
+
+    public static PropState GetProp(this LevelState level, GridPosition position)
+    {
+        return level.Props[level.Index(position)];
+    }
+
+    public static bool IsFloor(this LevelState level, GridPosition position)
+    {
+        return level.InBounds(position) && level.GetTerrain(position) == ECellTerrain.Floor;
+    }
+
+    public static bool IsClosedDoorEdge(this LevelState level, GridPosition a, GridPosition b)
+    {
+        return level.Doors.Any(door => door.State == EDoorState.Closed && SameEdge(door.A, door.B, a, b));
+    }
+
+    public static LevelState SetTerrain(this LevelState level, GridPosition position, ECellTerrain terrain)
+    {
+        var next = level.Terrain.ToArray();
+        next[level.Index(position)] = terrain;
+        var updated = level with { Terrain = next };
+        return terrain == ECellTerrain.Wall ? updated.ClearFloorOnlyState(position) : updated;
+    }
+
+    public static LevelState SetUnderground(this LevelState level, GridPosition position, ECarrierType carrier, UndergroundCell cell)
+    {
+        var next = level.Layer(carrier).ToArray();
+        next[level.Index(position)] = cell;
+        return carrier switch {
+            ECarrierType.Fuel => level with { Fuel = next },
+            ECarrierType.Coolant => level with { Coolant = next },
+            ECarrierType.Electricity => level with { Electricity = next },
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+    }
+
+    public static LevelState SetSurface(this LevelState level, GridPosition position, SurfaceState surface)
+    {
+        var next = level.Surface.ToArray();
+        next[level.Index(position)] = surface.Clamp();
+        return level with { Surface = next };
+    }
+
+    public static LevelState SetProp(this LevelState level, GridPosition position, PropState prop)
+    {
+        var next = level.Props.ToArray();
+        next[level.Index(position)] = prop;
+        return level with { Props = next };
+    }
+
+    public static LevelState WithRuntimeArrays(this LevelState level, UndergroundCell[] fuel, UndergroundCell[] coolant, UndergroundCell[] electricity, SurfaceState[] surface, PropState[] props)
+    {
+        return level with {
+            Fuel = fuel,
+            Coolant = coolant,
+            Electricity = electricity,
+            Surface = surface,
+            Props = props
+        };
+    }
+
+    public static IReadOnlyList<UndergroundCell> Layer(this LevelState level, ECarrierType carrier)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => level.Fuel,
+            ECarrierType.Coolant => level.Coolant,
+            ECarrierType.Electricity => level.Electricity,
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+    }
+
+    private static LevelState ClearFloorOnlyState(this LevelState level, GridPosition position)
+    {
+        return level.SetSurface(position, new())
+                    .SetProp(position, new())
+                    .SetUnderground(position, ECarrierType.Fuel, new())
+                    .SetUnderground(position, ECarrierType.Coolant, new())
+                    .SetUnderground(position, ECarrierType.Electricity, new());
+    }
+
+    private static bool SameEdge(GridPosition edgeA, GridPosition edgeB, GridPosition a, GridPosition b)
+    {
+        return edgeA == a && edgeB == b || edgeA == b && edgeB == a;
+    }
+}
--- a/src/ReactorMaintenance.Simulation/LevelStateFactory.cs
+++ b/src/ReactorMaintenance.Simulation/LevelStateFactory.cs
@@ -0,0 +1,54 @@
+namespace ReactorMaintenance.Simulation;
+
+public static class LevelStateFactory
+{
+    public static LevelState Create(string name, int width, int height)
+    {
+        if (width < Balancing.Current.MinimumLevelSize || height < Balancing.Current.MinimumLevelSize)
+            throw new ArgumentOutOfRangeException(nameof(width), $"Levels must be at least {Balancing.Current.MinimumLevelSize}x{Balancing.Current.MinimumLevelSize}.");
+
+        return new() {
+            Name = name,
+            Width = width,
+            Height = height,
+            Terrain = CreateTerrain(width, height),
+            Fuel = CreateUnderground(width, height),
+            Coolant = CreateUnderground(width, height),
+            Electricity = CreateUnderground(width, height),
+            Surface = CreateSurface(width, height),
+            Props = CreateProps(width, height),
+            Robot = new() { Position = new(1, 1) },
+            Forecasts = Array.Empty<Forecast>()
+        };
+    }
+
+    public static ECellTerrain[] CreateTerrain(int width, int height)
+    {
+        var terrain = Enumerable.Repeat(ECellTerrain.Floor, width * height).ToArray();
+        for (var y = 0; y < height; y++)
+        {
+            for (var x = 0; x < width; x++)
+            {
+                if (x == 0 || y == 0 || x == width - 1 || y == height - 1)
+                    terrain[y * width + x] = ECellTerrain.Wall;
+            }
+        }
+
+        return terrain;
+    }
+
+    public static UndergroundCell[] CreateUnderground(int width, int height)
+    {
+        return Enumerable.Range(0, width * height).Select(_ => new UndergroundCell()).ToArray();
+    }
+
+    public static SurfaceState[] CreateSurface(int width, int height)
+    {
+        return Enumerable.Range(0, width * height).Select(_ => new SurfaceState()).ToArray();
+    }
+
+    public static PropState[] CreateProps(int width, int height)
+    {
+        return Enumerable.Range(0, width * height).Select(_ => new PropState()).ToArray();
+    }
+}
--- a/src/ReactorMaintenance.Simulation/Models.cs
+++ b/src/ReactorMaintenance.Simulation/Models.cs
@@ -1,558 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public enum ECellTerrain
-{
-    Floor,
-    Wall
-}
-
-public enum ECarrierType
-{
-    Fuel,
-    Coolant,
-    Electricity
-}
-
-public enum EUndergroundState
-{
-    Absent,
-    Intact,
-    Leaking
-}
-
-public enum EPropType
-{
-    None,
-    Flow,
-    Consumer,
-    TJunction,
-    CrossJunction,
-    Door,
-    AllSeeingEyeTerminal,
-    RemedySupply,
-    ReactorControl
-}
-
-public enum EPropSwitchState
-{
-    Disabled,
-    Enabled
-}
-
-public enum EConsumerServiceState
-{
-    Unknown,
-    Disabled,
-    Starved,
-    Supplied,
-    Producing
-}
-
-public enum ETJunctionMode
-{
-    ZeroFour,
-    OneThree,
-    TwoTwo,
-    ThreeOne,
-    FourZero
-}
-
-public enum ECrossJunctionMode
-{
-    ZeroThreeThree,
-    ThreeZeroThree,
-    ThreeThreeZero,
-    TwoTwoTwo
-}
-
-public enum EDoorState
-{
-    Open,
-    Closed
-}
-
-public enum ERemedyType
-{
-    FuelNeutralizer,
-    CoolantNeutralizer,
-    ElectricityNeutralizer,
-    HeatShield
-}
-
-public enum ELevelState
-{
-    Stable,
-    Caution,
-    Critical,
-    Ready,
-    Lost,
-    Won
-}
-
-public enum EForecastKind
-{
-    TerminalLoss,
-    ReactorReady,
-    ConsumerStarved,
-    HazardGrowth,
-    RuleEvent
-}
-
-public enum ERuleEventPhase
-{
-    StartOfSimulation,
-    EndOfTurn
-}
-
-public enum ERulePredicateKind
-{
-    TurnAtLeast,
-    LevelStateIs,
-    ReactorReadyIs,
-    ReactorLostIs,
-    ReactorWonIs,
-    PropStateAt,
-    ConsumerStateAt,
-    NetworkBandAt,
-    SurfaceBandAt,
-    RobotAt,
-    RobotInventoryAtLeast,
-    AllSeeingEyeUnlocked
-}
-
-public enum ERuleEffectKind
-{
-    StartLeak,
-    WorsenLeak,
-    RepairNetworkCell,
-    DisableNetworkCell,
-    SetPropEnabled,
-    AddSurfaceHazard,
-    RemoveSurfaceHazard,
-    AddHeat,
-    RemoveHeat,
-    AddInventory,
-    RemoveInventory,
-    MarkTerminalLoss,
-    EmitWarning
-}
-
-public enum ENetworkValueKind
-{
-    Amount,
-    Intensity
-}
-
-public enum EBand
-{
-    Safe,
-    Caution,
-    Critical
-}
-
-public enum EPairEffect
-{
-    Hold,
-    FuelFlow,
-    CoolFlow,
-    ChargeFlow,
-    HeatFlow,
-    HeatFlow2,
-    Warm1,
-    Warm2,
-    Quench1,
-    Quench2,
-    Short1,
-    Short2,
-    Ignite1,
-    Ignite2
-}
-
-public sealed record GridPosition(int X, int Y)
-{
-    public IEnumerable<GridPosition> Neighbors()
-    {
-        yield return new(X, Y - 1);
-        yield return new(X + 1, Y);
-        yield return new(X, Y + 1);
-        yield return new(X - 1, Y);
-    }
-
-    public int ManhattanDistance(GridPosition other)
-    {
-        return Math.Abs(X - other.X) + Math.Abs(Y - other.Y);
-    }
-}
-
-public sealed record UndergroundCell
-{
-    public EUndergroundState State { get; init; }
-    public float Amount { get; init; }
-    public float Intensity { get; init; }
-
-    public bool IsPresent => State != EUndergroundState.Absent;
-    public bool CarriesFlow => State is EUndergroundState.Intact or EUndergroundState.Leaking;
-}
-
-public sealed record SurfaceState
-{
-    public float Fuel { get; init; }
-    public float Coolant { get; init; }
-    public float Electricity { get; init; }
-    public float Heat { get; init; }
-    public int FuelBlockTurns { get; init; }
-    public int CoolantBlockTurns { get; init; }
-    public int ElectricityBlockTurns { get; init; }
-
-    public SurfaceState Clamp()
-    {
-        var balancing = Balancing.Current;
-        return this with {
-            Fuel = balancing.ClampValue(Fuel),
-            Coolant = balancing.ClampValue(Coolant),
-            Electricity = balancing.ClampValue(Electricity),
-            Heat = balancing.ClampValue(Heat),
-            FuelBlockTurns = Math.Max(0, FuelBlockTurns),
-            CoolantBlockTurns = Math.Max(0, CoolantBlockTurns),
-            ElectricityBlockTurns = Math.Max(0, ElectricityBlockTurns)
-        };
-    }
-
-    public bool Blocks(ECarrierType carrier)
-    {
-        return carrier switch {
-            ECarrierType.Fuel => FuelBlockTurns > 0,
-            ECarrierType.Coolant => CoolantBlockTurns > 0,
-            ECarrierType.Electricity => ElectricityBlockTurns > 0,
-            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
-        };
-    }
-}
-
-public sealed record PropState
-{
-    public EPropType Type { get; init; }
-    public ECarrierType Carrier { get; init; }
-    public EPropSwitchState SwitchState { get; init; } = EPropSwitchState.Enabled;
-    public EConsumerServiceState ServiceState { get; init; } = EConsumerServiceState.Unknown;
-    public ETJunctionMode TJunctionMode { get; init; } = ETJunctionMode.TwoTwo;
-    public ECrossJunctionMode CrossJunctionMode { get; init; } = ECrossJunctionMode.TwoTwoTwo;
-    public ERemedyType RemedyType { get; init; }
-    public bool Depleted { get; init; }
-    public int ReactorId { get; init; }
-
-    public bool IsEnabled => SwitchState == EPropSwitchState.Enabled;
-}
-
-public sealed record DoorState
-{
-    public GridPosition A { get; init; } = new(0, 0);
-    public GridPosition B { get; init; } = new(0, 0);
-    public EDoorState State { get; init; } = EDoorState.Closed;
-}
-
-public sealed record LeakState
-{
-    public ECarrierType Carrier { get; init; }
-    public GridPosition UndergroundPosition { get; init; } = new(0, 0);
-    public GridPosition AccessPosition { get; init; } = new(0, 0);
-    public bool Repaired { get; init; }
-}
-
-public sealed record ReactorBinding
-{
-    public int ReactorId { get; init; }
-    public GridPosition ControlPosition { get; init; } = new(0, 0);
-    public GridPosition FuelConsumerPosition { get; init; } = new(0, 0);
-    public GridPosition CoolantConsumerPosition { get; init; } = new(0, 0);
-    public GridPosition ElectricityConsumerPosition { get; init; } = new(0, 0);
-    public bool Ready { get; init; }
-    public bool Activated { get; init; }
-}
-
-public sealed record RobotState
-{
-    public GridPosition Position { get; init; } = new(1, 1);
-    public int FuelNeutralizers { get; init; }
-    public int CoolantNeutralizers { get; init; }
-    public int ElectricityNeutralizers { get; init; }
-    public int HeatShields { get; init; }
-    public int HeatImmunitySteps { get; init; }
-
-    public int Count(ERemedyType remedy)
-    {
-        return remedy switch {
-            ERemedyType.FuelNeutralizer => FuelNeutralizers,
-            ERemedyType.CoolantNeutralizer => CoolantNeutralizers,
-            ERemedyType.ElectricityNeutralizer => ElectricityNeutralizers,
-            ERemedyType.HeatShield => HeatShields,
-            _ => throw new ArgumentOutOfRangeException(nameof(remedy), remedy, "Unsupported remedy.")
-        };
-    }
-
-    public RobotState Add(ERemedyType remedy, int amount)
-    {
-        return remedy switch {
-            ERemedyType.FuelNeutralizer => this with { FuelNeutralizers = ClampInventory(FuelNeutralizers + amount) },
-            ERemedyType.CoolantNeutralizer => this with { CoolantNeutralizers = ClampInventory(CoolantNeutralizers + amount) },
-            ERemedyType.ElectricityNeutralizer => this with { ElectricityNeutralizers = ClampInventory(ElectricityNeutralizers + amount) },
-            ERemedyType.HeatShield => this with { HeatShields = ClampInventory(HeatShields + amount) },
-            _ => throw new ArgumentOutOfRangeException(nameof(remedy), remedy, "Unsupported remedy.")
-        };
-    }
-
-    public RobotState Spend(ERemedyType remedy)
-    {
-        return Count(remedy) <= 0 ? this : Add(remedy, -1);
-    }
-
-    private static int ClampInventory(int value)
-    {
-        return Math.Clamp(value, 0, Balancing.Current.InventoryCapacityPerRemedy);
-    }
-}
-
-public sealed record RulePredicate
-{
-    public ERulePredicateKind Kind { get; init; }
-    public GridPosition Position { get; init; } = new(0, 0);
-    public int ReactorId { get; init; }
-    public int Turn { get; init; }
-    public ELevelState LevelState { get; init; }
-    public EPropSwitchState PropSwitchState { get; init; }
-    public EConsumerServiceState ConsumerServiceState { get; init; }
-    public ECarrierType Carrier { get; init; }
-    public ENetworkValueKind NetworkValue { get; init; }
-    public ERemedyType Remedy { get; init; }
-    public EBand Band { get; init; }
-    public int InventoryCount { get; init; }
-    public bool BoolValue { get; init; }
-}
-
-public sealed record RuleEffect
-{
-    public ERuleEffectKind Kind { get; init; }
-    public GridPosition Position { get; init; } = new(0, 0);
-    public GridPosition? AccessPosition { get; init; }
-    public ECarrierType Carrier { get; init; }
-    public ERemedyType Remedy { get; init; }
-    public float Amount { get; init; }
-    public EPropSwitchState PropSwitchState { get; init; }
-    public string Message { get; init; } = string.Empty;
-}
-
-public sealed record RuleEventState
-{
-    public string Id { get; init; } = string.Empty;
-    public bool Enabled { get; init; } = true;
-    public bool Repeat { get; init; }
-    public bool Triggered { get; init; }
-    public int Priority { get; init; }
-    public ERuleEventPhase Phase { get; init; }
-    public IReadOnlyList<RulePredicate> Predicates { get; init; } = Array.Empty<RulePredicate>();
-    public IReadOnlyList<RuleEffect> Effects { get; init; } = Array.Empty<RuleEffect>();
-    public string ForecastText { get; init; } = string.Empty;
-}
-
-public sealed record Forecast(EForecastKind Kind, GridPosition? Position, int Turns, string Message);
-public sealed record ValidationIssue(string Message, GridPosition? Position = null);
-
-public sealed record ValidationReport
-{
-    public IReadOnlyList<ValidationIssue> Errors { get; init; } = Array.Empty<ValidationIssue>();
-    public IReadOnlyList<ValidationIssue> Warnings { get; init; } = Array.Empty<ValidationIssue>();
-    public bool IsValid => Errors.Count == 0;
-}
-
-public sealed record GlobalState
-{
-    public int Turn { get; init; }
-    public int ActionsRemaining { get; init; } = Balancing.Current.ActionsPerTurn;
-    public ELevelState LevelState { get; init; } = ELevelState.Stable;
-    public string Status { get; init; } = "STABLE";
-    public bool AllSeeingEyeUnlocked { get; init; }
-    public bool TerminalLoss { get; init; }
-    public IReadOnlyList<string> Warnings { get; init; } = Array.Empty<string>();
-}
-
-public sealed record LevelState
-{
-    public static LevelState Create(string name, int width, int height)
-    {
-        if (width < Balancing.Current.MinimumLevelSize || height < Balancing.Current.MinimumLevelSize)
-            throw new ArgumentOutOfRangeException(nameof(width), $"Levels must be at least {Balancing.Current.MinimumLevelSize}x{Balancing.Current.MinimumLevelSize}.");
-
-        var terrain = Enumerable.Repeat(ECellTerrain.Floor, width * height).ToArray();
-        for (var y = 0; y < height; y++)
-        {
-            for (var x = 0; x < width; x++)
-            {
-                if (x == 0 || y == 0 || x == width - 1 || y == height - 1)
-                    terrain[y * width + x] = ECellTerrain.Wall;
-            }
-        }
-
-        var level = new LevelState {
-            Name = name,
-            Width = width,
-            Height = height,
-            Terrain = terrain,
-            Fuel = CreateUnderground(width, height),
-            Coolant = CreateUnderground(width, height),
-            Electricity = CreateUnderground(width, height),
-            Surface = CreateSurface(width, height),
-            Props = CreateProps(width, height),
-            Robot = new() { Position = new(1, 1) }
-        };
-
-        return level with { Forecasts = Array.Empty<Forecast>() };
-    }
-
-    public bool InBounds(GridPosition position)
-    {
-        return position.X >= 0 && position.Y >= 0 && position.X < Width && position.Y < Height;
-    }
-
-    public int Index(GridPosition position)
-    {
-        EnsureInBounds(position);
-        return position.Y * Width + position.X;
-    }
-
-    public ECellTerrain GetTerrain(GridPosition position)
-    {
-        return Terrain[Index(position)];
-    }
-
-    public UndergroundCell GetUnderground(GridPosition position, ECarrierType carrier)
-    {
-        return Layer(carrier)[Index(position)];
-    }
-
-    public SurfaceState GetSurface(GridPosition position)
-    {
-        return Surface[Index(position)];
-    }
-
-    public PropState GetProp(GridPosition position)
-    {
-        return Props[Index(position)];
-    }
-
-    public bool IsFloor(GridPosition position)
-    {
-        return InBounds(position) && GetTerrain(position) == ECellTerrain.Floor;
-    }
-
-    public bool IsClosedDoorEdge(GridPosition a, GridPosition b)
-    {
-        return Doors.Any(door => door.State == EDoorState.Closed && SameEdge(door.A, door.B, a, b));
-    }
-
-    public LevelState SetTerrain(GridPosition position, ECellTerrain terrain)
-    {
-        var next = Terrain.ToArray();
-        next[Index(position)] = terrain;
-        var level = this with { Terrain = next };
-        return terrain == ECellTerrain.Wall ? level.ClearFloorOnlyState(position) : level;
-    }
-
-    public LevelState SetUnderground(GridPosition position, ECarrierType carrier, UndergroundCell cell)
-    {
-        var next = Layer(carrier).ToArray();
-        next[Index(position)] = cell;
-        return carrier switch {
-            ECarrierType.Fuel => this with { Fuel = next },
-            ECarrierType.Coolant => this with { Coolant = next },
-            ECarrierType.Electricity => this with { Electricity = next },
-            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
-        };
-    }
-
-    public LevelState SetSurface(GridPosition position, SurfaceState surface)
-    {
-        var next = Surface.ToArray();
-        next[Index(position)] = surface.Clamp();
-        return this with { Surface = next };
-    }
-
-    public LevelState SetProp(GridPosition position, PropState prop)
-    {
-        var next = Props.ToArray();
-        next[Index(position)] = prop;
-        return this with { Props = next };
-    }
-
-    public LevelState WithRuntimeArrays(UndergroundCell[] fuel, UndergroundCell[] coolant, UndergroundCell[] electricity, SurfaceState[] surface, PropState[] props)
-    {
-        return this with {
-            Fuel = fuel,
-            Coolant = coolant,
-            Electricity = electricity,
-            Surface = surface,
-            Props = props
-        };
-    }
-
-    public IReadOnlyList<UndergroundCell> Layer(ECarrierType carrier)
-    {
-        return carrier switch {
-            ECarrierType.Fuel => Fuel,
-            ECarrierType.Coolant => Coolant,
-            ECarrierType.Electricity => Electricity,
-            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
-        };
-    }
-
-    private LevelState ClearFloorOnlyState(GridPosition position)
-    {
-        return SetSurface(position, new())
-               .SetProp(position, new())
-               .SetUnderground(position, ECarrierType.Fuel, new())
-               .SetUnderground(position, ECarrierType.Coolant, new())
-               .SetUnderground(position, ECarrierType.Electricity, new());
-    }
-
-    private void EnsureInBounds(GridPosition position)
-    {
-        if (!InBounds(position))
-            throw new ArgumentOutOfRangeException(nameof(position), $"Position {position.X},{position.Y} is outside {Width}x{Height}.");
-    }
-
-    private static bool SameEdge(GridPosition edgeA, GridPosition edgeB, GridPosition a, GridPosition b)
-    {
-        return edgeA == a && edgeB == b || edgeA == b && edgeB == a;
-    }
-
-    private static UndergroundCell[] CreateUnderground(int width, int height)
-    {
-        return Enumerable.Range(0, width * height).Select(_ => new UndergroundCell()).ToArray();
-    }
-
-    private static SurfaceState[] CreateSurface(int width, int height)
-    {
-        return Enumerable.Range(0, width * height).Select(_ => new SurfaceState()).ToArray();
-    }
-
-    private static PropState[] CreateProps(int width, int height)
-    {
-        return Enumerable.Range(0, width * height).Select(_ => new PropState()).ToArray();
-    }
-
-    public string Name { get; init; } = "New Reactor";
-    public int Width { get; init; } = Balancing.Current.DefaultLevelWidth;
-    public int Height { get; init; } = Balancing.Current.DefaultLevelHeight;
-    public ECellTerrain[] Terrain { get; init; } = Enumerable.Repeat(ECellTerrain.Floor, Balancing.Current.DefaultLevelWidth * Balancing.Current.DefaultLevelHeight).ToArray();
-    public UndergroundCell[] Fuel { get; init; } = CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public UndergroundCell[] Coolant { get; init; } = CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public UndergroundCell[] Electricity { get; init; } = CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public SurfaceState[] Surface { get; init; } = CreateSurface(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public PropState[] Props { get; init; } = CreateProps(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public IReadOnlyList<DoorState> Doors { get; init; } = Array.Empty<DoorState>();
-    public IReadOnlyList<LeakState> Leaks { get; init; } = Array.Empty<LeakState>();
-    public IReadOnlyList<ReactorBinding> Reactors { get; init; } = Array.Empty<ReactorBinding>();
-    public IReadOnlyList<RuleEventState> RuleEvents { get; init; } = Array.Empty<RuleEventState>();
-    public RobotState Robot { get; init; } = new();
-    public GlobalState Global { get; init; } = new();
-    public IReadOnlyList<Forecast> Forecasts { get; init; } = Array.Empty<Forecast>();
-}
--- a/src/ReactorMaintenance.Simulation/Models/DoorState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/DoorState.cs
@@ -0,0 +1,8 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record DoorState
+{
+    public GridPosition A { get; init; } = new(0, 0);
+    public GridPosition B { get; init; } = new(0, 0);
+    public EDoorState State { get; init; } = EDoorState.Closed;
+}
--- a/src/ReactorMaintenance.Simulation/Models/EBand.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EBand.cs
@@ -0,0 +1,8 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EBand
+{
+    Safe,
+    Caution,
+    Critical
+}
--- a/src/ReactorMaintenance.Simulation/Models/ECarrierType.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ECarrierType.cs
@@ -0,0 +1,8 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ECarrierType
+{
+    Fuel,
+    Coolant,
+    Electricity
+}
--- a/src/ReactorMaintenance.Simulation/Models/ECellTerrain.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ECellTerrain.cs
@@ -0,0 +1,7 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ECellTerrain
+{
+    Floor,
+    Wall
+}
--- a/src/ReactorMaintenance.Simulation/Models/EConsumerServiceState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EConsumerServiceState.cs
@@ -0,0 +1,10 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EConsumerServiceState
+{
+    Unknown,
+    Disabled,
+    Starved,
+    Supplied,
+    Producing
+}
--- a/src/ReactorMaintenance.Simulation/Models/ECrossJunctionMode.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ECrossJunctionMode.cs
@@ -0,0 +1,9 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ECrossJunctionMode
+{
+    ZeroThreeThree,
+    ThreeZeroThree,
+    ThreeThreeZero,
+    TwoTwoTwo
+}
--- a/src/ReactorMaintenance.Simulation/Models/EDoorState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EDoorState.cs
@@ -0,0 +1,7 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EDoorState
+{
+    Open,
+    Closed
+}
--- a/src/ReactorMaintenance.Simulation/Models/EForecastKind.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EForecastKind.cs
@@ -0,0 +1,10 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EForecastKind
+{
+    TerminalLoss,
+    ReactorReady,
+    ConsumerStarved,
+    HazardGrowth,
+    RuleEvent
+}
--- a/src/ReactorMaintenance.Simulation/Models/ELevelState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ELevelState.cs
@@ -0,0 +1,11 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ELevelState
+{
+    Stable,
+    Caution,
+    Critical,
+    Ready,
+    Lost,
+    Won
+}
--- a/src/ReactorMaintenance.Simulation/Models/ENetworkValueKind.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ENetworkValueKind.cs
@@ -0,0 +1,7 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ENetworkValueKind
+{
+    Amount,
+    Intensity
+}
--- a/src/ReactorMaintenance.Simulation/Models/EPairEffect.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EPairEffect.cs
@@ -0,0 +1,19 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EPairEffect
+{
+    Hold,
+    FuelFlow,
+    CoolFlow,
+    ChargeFlow,
+    HeatFlow,
+    HeatFlow2,
+    Warm1,
+    Warm2,
+    Quench1,
+    Quench2,
+    Short1,
+    Short2,
+    Ignite1,
+    Ignite2
+}
--- a/src/ReactorMaintenance.Simulation/Models/EPropSwitchState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EPropSwitchState.cs
@@ -0,0 +1,7 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EPropSwitchState
+{
+    Disabled,
+    Enabled
+}
--- a/src/ReactorMaintenance.Simulation/Models/EPropType.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EPropType.cs
@@ -0,0 +1,14 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EPropType
+{
+    None,
+    Flow,
+    Consumer,
+    TJunction,
+    CrossJunction,
+    Door,
+    AllSeeingEyeTerminal,
+    RemedySupply,
+    ReactorControl
+}
--- a/src/ReactorMaintenance.Simulation/Models/ERemedyType.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ERemedyType.cs
@@ -0,0 +1,9 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ERemedyType
+{
+    FuelNeutralizer,
+    CoolantNeutralizer,
+    ElectricityNeutralizer,
+    HeatShield
+}
--- a/src/ReactorMaintenance.Simulation/Models/ERuleEffectKind.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ERuleEffectKind.cs
@@ -0,0 +1,18 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ERuleEffectKind
+{
+    StartLeak,
+    WorsenLeak,
+    RepairNetworkCell,
+    DisableNetworkCell,
+    SetPropEnabled,
+    AddSurfaceHazard,
+    RemoveSurfaceHazard,
+    AddHeat,
+    RemoveHeat,
+    AddInventory,
+    RemoveInventory,
+    MarkTerminalLoss,
+    EmitWarning
+}
--- a/src/ReactorMaintenance.Simulation/Models/ERuleEventPhase.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ERuleEventPhase.cs
@@ -0,0 +1,7 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ERuleEventPhase
+{
+    StartOfSimulation,
+    EndOfTurn
+}
--- a/src/ReactorMaintenance.Simulation/Models/ERulePredicateKind.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ERulePredicateKind.cs
@@ -0,0 +1,17 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ERulePredicateKind
+{
+    TurnAtLeast,
+    LevelStateIs,
+    ReactorReadyIs,
+    ReactorLostIs,
+    ReactorWonIs,
+    PropStateAt,
+    ConsumerStateAt,
+    NetworkBandAt,
+    SurfaceBandAt,
+    RobotAt,
+    RobotInventoryAtLeast,
+    AllSeeingEyeUnlocked
+}
--- a/src/ReactorMaintenance.Simulation/Models/ETJunctionMode.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ETJunctionMode.cs
@@ -0,0 +1,10 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum ETJunctionMode
+{
+    ZeroFour,
+    OneThree,
+    TwoTwo,
+    ThreeOne,
+    FourZero
+}
--- a/src/ReactorMaintenance.Simulation/Models/EUndergroundState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/EUndergroundState.cs
@@ -0,0 +1,8 @@
+namespace ReactorMaintenance.Simulation;
+
+public enum EUndergroundState
+{
+    Absent,
+    Intact,
+    Leaking
+}
--- a/src/ReactorMaintenance.Simulation/Models/Forecast.cs
+++ b/src/ReactorMaintenance.Simulation/Models/Forecast.cs
@@ -0,0 +1,3 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record Forecast(EForecastKind Kind, GridPosition? Position, int Turns, string Message);
--- a/src/ReactorMaintenance.Simulation/Models/GlobalState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/GlobalState.cs
@@ -0,0 +1,12 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record GlobalState
+{
+    public int Turn { get; init; }
+    public int ActionsRemaining { get; init; } = Balancing.Current.ActionsPerTurn;
+    public ELevelState LevelState { get; init; } = ELevelState.Stable;
+    public string Status { get; init; } = "STABLE";
+    public bool AllSeeingEyeUnlocked { get; init; }
+    public bool TerminalLoss { get; init; }
+    public IReadOnlyList<string> Warnings { get; init; } = Array.Empty<string>();
+}
--- a/src/ReactorMaintenance.Simulation/Models/GridPosition.cs
+++ b/src/ReactorMaintenance.Simulation/Models/GridPosition.cs
@@ -0,0 +1,3 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record GridPosition(int X, int Y);
--- a/src/ReactorMaintenance.Simulation/Models/LeakState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/LeakState.cs
@@ -0,0 +1,9 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record LeakState
+{
+    public ECarrierType Carrier { get; init; }
+    public GridPosition UndergroundPosition { get; init; } = new(0, 0);
+    public GridPosition AccessPosition { get; init; } = new(0, 0);
+    public bool Repaired { get; init; }
+}
--- a/src/ReactorMaintenance.Simulation/Models/LevelState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/LevelState.cs
@@ -0,0 +1,26 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record LevelState
+{
+    public static LevelState Create(string name, int width, int height)
+    {
+        return LevelStateFactory.Create(name, width, height);
+    }
+
+    public string Name { get; init; } = "New Reactor";
+    public int Width { get; init; } = Balancing.Current.DefaultLevelWidth;
+    public int Height { get; init; } = Balancing.Current.DefaultLevelHeight;
+    public ECellTerrain[] Terrain { get; init; } = LevelStateFactory.CreateTerrain(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public UndergroundCell[] Fuel { get; init; } = LevelStateFactory.CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public UndergroundCell[] Coolant { get; init; } = LevelStateFactory.CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public UndergroundCell[] Electricity { get; init; } = LevelStateFactory.CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public SurfaceState[] Surface { get; init; } = LevelStateFactory.CreateSurface(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public PropState[] Props { get; init; } = LevelStateFactory.CreateProps(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
+    public IReadOnlyList<DoorState> Doors { get; init; } = Array.Empty<DoorState>();
+    public IReadOnlyList<LeakState> Leaks { get; init; } = Array.Empty<LeakState>();
+    public IReadOnlyList<ReactorBinding> Reactors { get; init; } = Array.Empty<ReactorBinding>();
+    public IReadOnlyList<RuleEventState> RuleEvents { get; init; } = Array.Empty<RuleEventState>();
+    public RobotState Robot { get; init; } = new();
+    public GlobalState Global { get; init; } = new();
+    public IReadOnlyList<Forecast> Forecasts { get; init; } = Array.Empty<Forecast>();
+}
--- a/src/ReactorMaintenance.Simulation/Models/PropState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/PropState.cs
@@ -0,0 +1,16 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record PropState
+{
+    public EPropType Type { get; init; }
+    public ECarrierType Carrier { get; init; }
+    public EPropSwitchState SwitchState { get; init; } = EPropSwitchState.Enabled;
+    public EConsumerServiceState ServiceState { get; init; } = EConsumerServiceState.Unknown;
+    public ETJunctionMode TJunctionMode { get; init; } = ETJunctionMode.TwoTwo;
+    public ECrossJunctionMode CrossJunctionMode { get; init; } = ECrossJunctionMode.TwoTwoTwo;
+    public ERemedyType RemedyType { get; init; }
+    public bool Depleted { get; init; }
+    public int ReactorId { get; init; }
+
+    public bool IsEnabled => SwitchState == EPropSwitchState.Enabled;
+}
--- a/src/ReactorMaintenance.Simulation/Models/ReactorBinding.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ReactorBinding.cs
@@ -0,0 +1,12 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record ReactorBinding
+{
+    public int ReactorId { get; init; }
+    public GridPosition ControlPosition { get; init; } = new(0, 0);
+    public GridPosition FuelConsumerPosition { get; init; } = new(0, 0);
+    public GridPosition CoolantConsumerPosition { get; init; } = new(0, 0);
+    public GridPosition ElectricityConsumerPosition { get; init; } = new(0, 0);
+    public bool Ready { get; init; }
+    public bool Activated { get; init; }
+}
--- a/src/ReactorMaintenance.Simulation/Models/RobotState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/RobotState.cs
@@ -0,0 +1,11 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record RobotState
+{
+    public GridPosition Position { get; init; } = new(1, 1);
+    public int FuelNeutralizers { get; init; }
+    public int CoolantNeutralizers { get; init; }
+    public int ElectricityNeutralizers { get; init; }
+    public int HeatShields { get; init; }
+    public int HeatImmunitySteps { get; init; }
+}
--- a/src/ReactorMaintenance.Simulation/Models/RuleEffect.cs
+++ b/src/ReactorMaintenance.Simulation/Models/RuleEffect.cs
@@ -0,0 +1,13 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record RuleEffect
+{
+    public ERuleEffectKind Kind { get; init; }
+    public GridPosition Position { get; init; } = new(0, 0);
+    public GridPosition? AccessPosition { get; init; }
+    public ECarrierType Carrier { get; init; }
+    public ERemedyType Remedy { get; init; }
+    public float Amount { get; init; }
+    public EPropSwitchState PropSwitchState { get; init; }
+    public string Message { get; init; } = string.Empty;
+}
--- a/src/ReactorMaintenance.Simulation/Models/RuleEventState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/RuleEventState.cs
@@ -0,0 +1,14 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record RuleEventState
+{
+    public string Id { get; init; } = string.Empty;
+    public bool Enabled { get; init; } = true;
+    public bool Repeat { get; init; }
+    public bool Triggered { get; init; }
+    public int Priority { get; init; }
+    public ERuleEventPhase Phase { get; init; }
+    public IReadOnlyList<RulePredicate> Predicates { get; init; } = Array.Empty<RulePredicate>();
+    public IReadOnlyList<RuleEffect> Effects { get; init; } = Array.Empty<RuleEffect>();
+    public string ForecastText { get; init; } = string.Empty;
+}
--- a/src/ReactorMaintenance.Simulation/Models/RulePredicate.cs
+++ b/src/ReactorMaintenance.Simulation/Models/RulePredicate.cs
@@ -0,0 +1,18 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record RulePredicate
+{
+    public ERulePredicateKind Kind { get; init; }
+    public GridPosition Position { get; init; } = new(0, 0);
+    public int ReactorId { get; init; }
+    public int Turn { get; init; }
+    public ELevelState LevelState { get; init; }
+    public EPropSwitchState PropSwitchState { get; init; }
+    public EConsumerServiceState ConsumerServiceState { get; init; }
+    public ECarrierType Carrier { get; init; }
+    public ENetworkValueKind NetworkValue { get; init; }
+    public ERemedyType Remedy { get; init; }
+    public EBand Band { get; init; }
+    public int InventoryCount { get; init; }
+    public bool BoolValue { get; init; }
+}
--- a/src/ReactorMaintenance.Simulation/Models/SurfaceState.cs
+++ b/src/ReactorMaintenance.Simulation/Models/SurfaceState.cs
@@ -0,0 +1,12 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record SurfaceState
+{
+    public float Fuel { get; init; }
+    public float Coolant { get; init; }
+    public float Electricity { get; init; }
+    public float Heat { get; init; }
+    public int FuelBlockTurns { get; init; }
+    public int CoolantBlockTurns { get; init; }
+    public int ElectricityBlockTurns { get; init; }
+}
--- a/src/ReactorMaintenance.Simulation/Models/UndergroundCell.cs
+++ b/src/ReactorMaintenance.Simulation/Models/UndergroundCell.cs
@@ -0,0 +1,11 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record UndergroundCell
+{
+    public EUndergroundState State { get; init; }
+    public float Amount { get; init; }
+    public float Intensity { get; init; }
+
+    public bool IsPresent => State != EUndergroundState.Absent;
+    public bool CarriesFlow => State is EUndergroundState.Intact or EUndergroundState.Leaking;
+}
--- a/src/ReactorMaintenance.Simulation/Models/ValidationIssue.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ValidationIssue.cs
@@ -0,0 +1,3 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record ValidationIssue(string Message, GridPosition? Position = null);
--- a/src/ReactorMaintenance.Simulation/Models/ValidationReport.cs
+++ b/src/ReactorMaintenance.Simulation/Models/ValidationReport.cs
@@ -0,0 +1,8 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record ValidationReport
+{
+    public IReadOnlyList<ValidationIssue> Errors { get; init; } = Array.Empty<ValidationIssue>();
+    public IReadOnlyList<ValidationIssue> Warnings { get; init; } = Array.Empty<ValidationIssue>();
+    public bool IsValid => Errors.Count == 0;
+}
--- a/src/ReactorMaintenance.Simulation/RobotStateExtensions.cs
+++ b/src/ReactorMaintenance.Simulation/RobotStateExtensions.cs
@@ -0,0 +1,36 @@
+namespace ReactorMaintenance.Simulation;
+
+public static class RobotStateExtensions
+{
+    public static int Count(this RobotState robot, ERemedyType remedy)
+    {
+        return remedy switch {
+            ERemedyType.FuelNeutralizer => robot.FuelNeutralizers,
+            ERemedyType.CoolantNeutralizer => robot.CoolantNeutralizers,
+            ERemedyType.ElectricityNeutralizer => robot.ElectricityNeutralizers,
+            ERemedyType.HeatShield => robot.HeatShields,
+            _ => throw new ArgumentOutOfRangeException(nameof(remedy), remedy, "Unsupported remedy.")
+        };
+    }
+
+    public static RobotState Add(this RobotState robot, ERemedyType remedy, int amount)
+    {
+        return remedy switch {
+            ERemedyType.FuelNeutralizer => robot with { FuelNeutralizers = ClampInventory(robot.FuelNeutralizers + amount) },
+            ERemedyType.CoolantNeutralizer => robot with { CoolantNeutralizers = ClampInventory(robot.CoolantNeutralizers + amount) },
+            ERemedyType.ElectricityNeutralizer => robot with { ElectricityNeutralizers = ClampInventory(robot.ElectricityNeutralizers + amount) },
+            ERemedyType.HeatShield => robot with { HeatShields = ClampInventory(robot.HeatShields + amount) },
+            _ => throw new ArgumentOutOfRangeException(nameof(remedy), remedy, "Unsupported remedy.")
+        };
+    }
+
+    public static RobotState Spend(this RobotState robot, ERemedyType remedy)
+    {
+        return robot.Count(remedy) <= 0 ? robot : robot.Add(remedy, -1);
+    }
+
+    private static int ClampInventory(int value)
+    {
+        return Math.Clamp(value, 0, Balancing.Current.InventoryCapacityPerRemedy);
+    }
+}
--- a/src/ReactorMaintenance.Simulation/SurfaceStateExtensions.cs
+++ b/src/ReactorMaintenance.Simulation/SurfaceStateExtensions.cs
@@ -0,0 +1,28 @@
+namespace ReactorMaintenance.Simulation;
+
+public static class SurfaceStateExtensions
+{
+    public static SurfaceState Clamp(this SurfaceState surface)
+    {
+        var balancing = Balancing.Current;
+        return surface with {
+            Fuel = balancing.ClampValue(surface.Fuel),
+            Coolant = balancing.ClampValue(surface.Coolant),
+            Electricity = balancing.ClampValue(surface.Electricity),
+            Heat = balancing.ClampValue(surface.Heat),
+            FuelBlockTurns = Math.Max(0, surface.FuelBlockTurns),
+            CoolantBlockTurns = Math.Max(0, surface.CoolantBlockTurns),
+            ElectricityBlockTurns = Math.Max(0, surface.ElectricityBlockTurns)
+        };
+    }
+
+    public static bool Blocks(this SurfaceState surface, ECarrierType carrier)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => surface.FuelBlockTurns > 0,
+            ECarrierType.Coolant => surface.CoolantBlockTurns > 0,
+            ECarrierType.Electricity => surface.ElectricityBlockTurns > 0,
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+    }
+}