ported from perforce

RobotAndDonkey.Game/Intents/ModifyRobot.cs

@@ -0,0 +1,35 @@
+using RobotAndDonkey.Game.Execution.Results;
+using RobotAndDonkey.Game.GameState;
+using RobotAndDonkey.Game.Modifiers;
+
+namespace RobotAndDonkey.Game.Intents;
+
+public class ModifyRobot(EModifierId modifierId, EModifierDuration duration) : Intent
+{
+    public override void Run(Guid requestId, CoreLoop coreLoop, List<Intent> newIntents, List<Result> results)
+    {
+        coreLoop.Robot.AddModifier(ModifierId switch
+        {
+            EModifierId.Pest      => new PestModifier(Duration),
+            EModifierId.Gravity   => new GravityModifier(Duration),
+            EModifierId.HeatWave  => new HeatWaveModifier(Duration),
+            _                     => throw new ArgumentOutOfRangeException()
+        }, newIntents);
+        results.Add(new ModifyRobotResult(requestId));
+
+        base.Run(requestId, coreLoop, newIntents, results);
+    }
+
+    public override bool IsValid(CoreLoop coreLoop)
+    {
+        return base.IsValid(coreLoop) && 
+               ModifierId is EModifierId.Pest or EModifierId.Gravity or EModifierId.HeatWave && 
+               coreLoop.Robot.Modifiers.All(m => m.Id != ModifierId);
+    }
+
+    public EModifierId ModifierId { get; set; } = modifierId;
+
+    public EModifierDuration Duration { get; set; } = duration;
+
+    public override string ToString() => $"Modify robot with {ModifierId}, {Duration}, " + base.ToString();
+}