ported from perforce

RobotAndDonkey.Game/Modifiers/RangerFertileRestModifier.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using RobotAndDonkey.Game.Board;
+using RobotAndDonkey.Game.Data;
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Intents;
+using RobotAndDonkey.Game.Pois;
+
+namespace RobotAndDonkey.Game.Modifiers;
+
+public record RangerFertileRestModifier() : Modifier(EModifierKind.Robot, EModifierId.RangerFertileRest, EModifierDuration.Permanent)
+{
+    protected override RangerFertileRestModifier CreateInstance() => new();
+
+    public override void Before(Guid requestId, ReadOnlySpan<Intent> intents, CoreLoop coreLoop, Entity owner, List<Intent> newIntents, List<Result> results)
+    {
+        var avatarCell = coreLoop.Board.Cells.First(c => c.Poi is Avatar);
+        if (avatarCell.Type != ECellType.Fertile)
+            return;
+
+        foreach (var intent in intents)
+        {
+            if (intent is ModifyCurrency { Delta.Energy: > 0 })
+            {
+                newIntents.Add(new ModifyCurrency(new(Balancing.Instance.RangerFertileRestEnergyDelta, 0, 0, 0, 0, 0)));
+                break;
+            }
+        }
+    }
+
+    public override string ToolTip => $"Replenishes an extra {Balancing.Instance.RangerFertileRestEnergyDelta} energy when resting on fertile ground";
+}