ported from perforce

RobotAndDonkey.Game/Modifiers/PestModifier.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using RobotAndDonkey.Game.Data;
+using RobotAndDonkey.Game.Execution;
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Intents;
+
+namespace RobotAndDonkey.Game.Modifiers;
+
+public record PestModifier(EModifierDuration Duration) : Modifier(EModifierKind.Robot, EModifierId.Pest, Duration)
+{
+    protected override PestModifier CreateInstance() => new(Duration);
+
+    public override void Before(Guid requestId, ReadOnlySpan<Intent> intents, CoreLoop coreLoop, Entity owner, List<Intent> newIntents, List<Result> results)
+    {
+        foreach (var intent in intents)
+        {
+            if (intent is ModifyCurrency { Delta.Delivery: > 0 } modifyCurrency)
+            {
+                var original = modifyCurrency.Delta;
+                var reduced  = (int)MathF.Floor(original.Delivery * Balancing.Instance.PestDeliveryMultiplier);
+                modifyCurrency.Delta = original with { Delivery = reduced };
+            }
+        }
+    }
+
+    public override string ToolTip => $"Deliveries are reduced to {Balancing.Instance.PestDeliveryMultiplier * 100:N0}% (temporary).";
+}