namespace ICRebuild.Core;

public readonly struct ActionRangeCheckScope : IDisposable
{
    [ThreadStatic] private static bool active;
    private readonly bool previous;
    private ActionRangeCheckScope(bool allowed) { previous=active; active=allowed; }
    public static ActionRangeCheckScope Enter(bool allowed) => new(allowed);
    public static bool Active => active;
    public void Dispose() => active=previous;
}

public static class TargetRadiusPolicy
{
    // One target radius is used consistently by native drawing, attack checks and gap-closer placement.
    // Never add the bonus to the player's own radius (which would double the landing displacement).
    public static float Adjust(GameFrame frame,nint actor,uint entityId,float original,float extra) =>
        frame.Ready && actor!=0 && actor!=frame.LocalAddress && actor==frame.TargetAddress && entityId==frame.TargetEntityId && float.IsFinite(original) && original>=0
            ? original+Policies.FiniteClamp(extra,0,5) : original;
}

public sealed record TargetRadiusObservation(uint EntityId,float Original,float Effective);

public readonly struct NativeTargetRingScope : IDisposable
{
    [ThreadStatic] private static bool active;
    private readonly bool previous;
    private NativeTargetRingScope(bool allowed) { previous=active; active=allowed; }
    public static NativeTargetRingScope Enter(bool allowed) => new(allowed);
    public static bool Active => active;
    public void Dispose() => active=previous;
}