Split simulation systems

src/ReactorMaintenance.Simulation/SurfaceCarrierMath.cs

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+namespace ReactorMaintenance.Simulation;
+
+internal static class SurfaceCarrierMath
+{
+    public static SurfaceState AddCarrier(SurfaceState surface, ECarrierType carrier, float amount)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => surface with { Fuel = surface.Fuel + amount },
+            ECarrierType.Coolant => surface with { Coolant = surface.Coolant + amount },
+            ECarrierType.Electricity => surface with { Electricity = surface.Electricity + amount },
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+    }
+
+    public static SurfaceState RemoveCarrier(SurfaceState surface, ECarrierType carrier)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => surface with { Fuel = 0, FuelBlockTurns = Balancing.Current.RemedyBlockTurns },
+            ECarrierType.Coolant => surface with { Coolant = 0, CoolantBlockTurns = Balancing.Current.RemedyBlockTurns },
+            ECarrierType.Electricity => surface with { Electricity = 0, ElectricityBlockTurns = Balancing.Current.RemedyBlockTurns },
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+    }
+}