ported from perforce

RobotAndDonkey.Game/Modifiers/CourierOverspillModifier.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using RobotAndDonkey.Game.Data;
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Intents;
+
+namespace RobotAndDonkey.Game.Modifiers;
+
+public record CourierOverspillModifier() : Modifier(EModifierKind.Robot, EModifierId.CourierOverspill, EModifierDuration.Permanent)
+{
+    protected override CourierOverspillModifier CreateInstance() => new();
+
+    public override void After(Guid requestId, ReadOnlySpan<Intent> intents, CoreLoop coreLoop, Entity owner, List<Intent> newIntents, List<Result> results)
+    {
+        var deliveryPresent = false;
+        foreach (var intent in intents)
+        {
+            if (intent is not ModifyCurrency modifyCurrency)
+                return;
+
+            if (modifyCurrency.Delta is not { Delivery: > 0 })
+                continue;
+
+            deliveryPresent = true;
+            break;
+        }
+
+        if (deliveryPresent)
+            newIntents.Add(new ModifyCurrency(new(Balancing.Instance.CourierEnergyReplenishOnDelivery, 0, 0, 0, 0, 0)));
+    }
+
+    public override string ToolTip => $"Replenishes {Balancing.Instance.CourierEnergyReplenishOnDelivery} energy with every delivery";
+}