ported from perforce

RobotAndDonkey.Game/Intents/ModifyCell.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using RobotAndDonkey.Game.Board;
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Modifiers;
+
+namespace RobotAndDonkey.Game.Intents;
+
+public class ModifyCell(Cell cell, EModifierId modifierId, EModifierDuration duration) : Intent
+{
+    public override void Run(Guid requestId, CoreLoop coreLoop, List<Intent> newIntents, List<Result> results)
+    {
+        Cell.AddModifier(ModifierId switch
+        {
+            EModifierId.Rain    => new RainModifier(Duration),
+            EModifierId.Drought => new DroughtModifier(Duration),
+            _                   => throw new ArgumentOutOfRangeException()
+        }, newIntents);
+        results.Add(new ModifyCellResult(requestId, new(coreLoop.Board), ModifierId, Cell.Hex));
+
+        base.Run(requestId, coreLoop, newIntents, results);
+    }
+
+    public override bool IsValid(CoreLoop coreLoop)
+    {
+        return base.IsValid(coreLoop) && ModifierId is EModifierId.Rain or EModifierId.Drought && Cell.Modifiers.All(m => m.Id != ModifierId);
+    }
+
+    public EModifierId ModifierId { get; set; } = modifierId;
+
+    public EModifierDuration Duration { get; set; } = duration;
+
+    public Cell Cell { get; set; } = cell;
+
+    public override string ToString() => $"Modify {Cell.Hex} with {ModifierId}, {Duration}, " + base.ToString();
+}