Split CanUse into CouldUse & IsPossible

Simulator/Actions/BaseAction.cs

@@ -25,8 +25,19 @@ public abstract class BaseAction
     public virtual int Efficiency(Simulator s) => 0;
     public virtual float SuccessRate(Simulator s) => 1f;
 
-    public virtual bool CanUse(Simulator s) =>
+    // Return true if it can be in the action pool now or in the future
-        s.Input.Stats.Level >= Level && s.CP >= CPCost(s);
+    // e.g. if Heart and Soul is already used, it is impossible to use it again
+    // or if it's a first step action and IsFirstStep is false
+    public virtual bool IsPossible(Simulator s) =>
+        s.Input.Stats.Level >= Level;
+
+    // Return true if it can be used now
+    // This already assumes that IsPossible returns true *at some point before*
+    public virtual bool CouldUse(Simulator s) =>
+        s.CP >= CPCost(s);
+
+    public bool CanUse(Simulator s) =>
+        IsPossible(s) && CouldUse(s);
 
     public virtual void Use(Simulator s)
     {

Simulator/Actions/BaseComboAction.cs

@@ -7,8 +7,8 @@ public abstract class BaseComboAction : BaseAction
 
     public sealed override ActionCategory Category => ActionCategory.Combo;
 
-    protected bool BaseCanUse(Simulator s) =>
+    protected bool BaseCouldUse(Simulator s) =>
-        base.CanUse(s);
+        base.CouldUse(s);
 
     private static bool VerifyDurability2(int durabilityA, int durability, in Effects effects)
     {

Simulator/Actions/BaseComboActionImpl.cs

@@ -13,8 +13,10 @@ internal abstract class BaseComboAction<A, B> : BaseComboAction where A : BaseAc
 
     public override int CPCost(Simulator s) => ActionA.CPCost(s) + ActionB.CPCost(s);
 
-    public override bool CanUse(Simulator s) =>
+    public override bool IsPossible(Simulator s) => ActionA.IsPossible(s) && ActionB.IsPossible(s);
-        BaseCanUse(s) && VerifyDurability2(s, ActionA.DurabilityCost);
+
+    public override bool CouldUse(Simulator s) =>
+        BaseCouldUse(s) && VerifyDurability2(s, ActionA.DurabilityCost);
 
     public override void Use(Simulator s)
     {

Simulator/Actions/ByregotsBlessing.cs

@@ -11,7 +11,7 @@ internal sealed class ByregotsBlessing : BaseAction
     public override int CPCost(Simulator s) => 24;
     public override int Efficiency(Simulator s) => 100 + (20 * s.GetEffectStrength(EffectType.InnerQuiet));
 
-    public override bool CanUse(Simulator s) => s.HasEffect(EffectType.InnerQuiet) && base.CanUse(s);
+    public override bool CouldUse(Simulator s) => s.HasEffect(EffectType.InnerQuiet) && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Actions/CarefulObservation.cs

@@ -12,10 +12,13 @@ internal sealed class CarefulObservation : BaseAction
 
     public override int CPCost(Simulator s) => 0;
 
-    public override bool CanUse(Simulator s) => s.Input.Stats.IsSpecialist && s.ActionStates.CarefulObservationCount < 3;
+    public override bool IsPossible(Simulator s) =>
+        base.IsPossible(s) && s.Input.Stats.IsSpecialist && s.ActionStates.CarefulObservationCount < 3;
+
+    public override bool CouldUse(Simulator s) => s.ActionStates.CarefulObservationCount < 3;
 
     public override void UseSuccess(Simulator s) => s.StepCondition();
 
     public override string GetTooltip(Simulator s, bool addUsability) =>
-        $"{base.GetTooltip(s, addUsability)}Specialist Only";
+        $"{base.GetTooltip(s, addUsability)}Specialist Only\n";
 }

Simulator/Actions/HeartAndSoul.cs

@@ -13,8 +13,11 @@ internal sealed class HeartAndSoul : BaseBuffAction
 
     public override int CPCost(Simulator s) => 0;
 
-    public override bool CanUse(Simulator s) => s.Input.Stats.IsSpecialist && !s.ActionStates.UsedHeartAndSoul;
+    public override bool IsPossible(Simulator s) =>
+        base.IsPossible(s) && s.Input.Stats.IsSpecialist && !s.ActionStates.UsedHeartAndSoul;
+
+    public override bool CouldUse(Simulator s) => !s.ActionStates.UsedHeartAndSoul;
 
     public override string GetTooltip(Simulator s, bool addUsability) =>
-        $"{GetBaseTooltip(s, addUsability)}Specialist Only";
+        $"{GetBaseTooltip(s, addUsability)}Specialist Only\n";
 }

Simulator/Actions/IntensiveSynthesis.cs

@@ -11,9 +11,9 @@ internal sealed class IntensiveSynthesis : BaseAction
     public override int CPCost(Simulator s) => 6;
     public override int Efficiency(Simulator s) => 400;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         (s.Condition == Condition.Good || s.Condition == Condition.Excellent || s.HasEffect(EffectType.HeartAndSoul))
-        && base.CanUse(s);
+        && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Actions/Manipulation.cs

@@ -10,7 +10,9 @@ internal sealed class Manipulation : BaseBuffAction
     public override byte Duration => 8;
 
     public override int CPCost(Simulator s) => 96;
-    public override bool CanUse(Simulator s) => s.Input.Stats.CanUseManipulation && base.CanUse(s);
+
+    public override bool IsPossible(Simulator s) =>
+        s.Input.Stats.CanUseManipulation && base.IsPossible(s);
 
     public override void Use(Simulator s)
     {

Simulator/Actions/MuscleMemory.cs

@@ -11,7 +11,9 @@ internal sealed class MuscleMemory : BaseAction
     public override int CPCost(Simulator s) => 6;
     public override int Efficiency(Simulator s) => 300;
 
-    public override bool CanUse(Simulator s) => s.IsFirstStep && base.CanUse(s);
+    public override bool IsPossible(Simulator s) => s.IsFirstStep && base.IsPossible(s);
+
+    public override bool CouldUse(Simulator s) => s.IsFirstStep && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Actions/PreciseTouch.cs

@@ -11,9 +11,9 @@ internal sealed class PreciseTouch : BaseAction
     public override int CPCost(Simulator s) => 18;
     public override int Efficiency(Simulator s) => 150;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         (s.Condition == Condition.Good || s.Condition == Condition.Excellent || s.HasEffect(EffectType.HeartAndSoul))
-        && base.CanUse(s);
+        && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Actions/PrudentSynthesis.cs

@@ -12,7 +12,7 @@ internal sealed class PrudentSynthesis : BaseAction
     public override int CPCost(Simulator s) => 18;
     public override int Efficiency(Simulator s) => 180;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         !(s.HasEffect(EffectType.WasteNot) || s.HasEffect(EffectType.WasteNot2))
-        && base.CanUse(s);
+        && base.CouldUse(s);
 }

Simulator/Actions/PrudentTouch.cs

@@ -12,7 +12,7 @@ internal sealed class PrudentTouch : BaseAction
     public override int CPCost(Simulator s) => 25;
     public override int Efficiency(Simulator s) => 100;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         !(s.HasEffect(EffectType.WasteNot) || s.HasEffect(EffectType.WasteNot2))
-        && base.CanUse(s);
+        && base.CouldUse(s);
 }

Simulator/Actions/Reflect.cs

@@ -11,7 +11,9 @@ internal sealed class Reflect : BaseAction
     public override int CPCost(Simulator s) => 6;
     public override int Efficiency(Simulator s) => 100;
 
-    public override bool CanUse(Simulator s) => s.IsFirstStep && base.CanUse(s);
+    public override bool IsPossible(Simulator s) => s.IsFirstStep && base.IsPossible(s);
+
+    public override bool CouldUse(Simulator s) => s.IsFirstStep && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Actions/TrainedEye.cs

@@ -10,11 +10,12 @@ internal sealed class TrainedEye : BaseAction
 
     public override int CPCost(Simulator s) => 250;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool IsPossible(Simulator s) => s.IsFirstStep &&
-        s.IsFirstStep &&
         !s.Input.Recipe.IsExpert &&
         s.Input.Stats.Level >= (s.Input.Recipe.ClassJobLevel + 10) &&
-        base.CanUse(s);
+        base.IsPossible(s);
+
+    public override bool CouldUse(Simulator s) => s.IsFirstStep && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s) =>
         s.IncreaseQualityRaw(s.Input.Recipe.MaxQuality - s.Quality);

Simulator/Actions/TrainedFinesse.cs

@@ -12,7 +12,7 @@ internal sealed class TrainedFinesse : BaseAction
     public override int CPCost(Simulator s) => 32;
     public override int Efficiency(Simulator s) => 100;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         s.GetEffectStrength(EffectType.InnerQuiet) == 10
-        && base.CanUse(s);
+        && base.CouldUse(s);
 }

Simulator/Actions/TricksOfTheTrade.cs

@@ -10,9 +10,9 @@ internal sealed class TricksOfTheTrade : BaseAction
 
     public override int CPCost(Simulator s) => 0;
 
-    public override bool CanUse(Simulator s) =>
+    public override bool CouldUse(Simulator s) =>
         (s.Condition == Condition.Good || s.Condition == Condition.Excellent || s.HasEffect(EffectType.HeartAndSoul))
-        && base.CanUse(s);
+        && base.CouldUse(s);
 
     public override void UseSuccess(Simulator s)
     {

Simulator/Simulator.cs

@@ -35,7 +35,12 @@ public class Simulator
     }
     public bool IsComplete => CompletionState != CompletionState.Incomplete;
 
-    public IEnumerable<ActionType> AvailableActions => ActionUtils.AvailableActions(this);
+    public SimulationState ExecuteUnchecked(in SimulationState state, ActionType action)
+    {
+        this.state = state;
+        ExecuteUnchecked(action);
+        return this.state;
+    }
 
     public (ActionResponse Response, SimulationState NewState) Execute(in SimulationState state, ActionType action)
     {
@@ -43,6 +48,10 @@ public class Simulator
         return (Execute(action), this.state);
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void ExecuteUnchecked(ActionType action) =>
+        action.Base().Use(this);
+
     private ActionResponse Execute(ActionType action)
     {
         if (IsComplete)