namespace IdleSpectator;

/// <summary>
/// While Idle Spectator focuses a unit, reuse vanilla destination / lover / attack
/// cursor arrows by pinning <see cref="UnitSelectionEffect.last_actor"/>.
/// Arrow visibility follows the player's existing PlayerConfig toggles
/// (<c>cursor_arrow_destination</c>, <c>cursor_arrow_lover</c>,
/// <c>cursor_arrow_attack_target</c>) - idle does not force them on or off.
/// </summary>
internal static class FocusRelationshipArrows
{
    public static void OnSpectatorEnabled()
    {
        PinFocusActor();
    }

    public static void OnSpectatorDisabled()
    {
        UnitSelectionEffect.setLastActor(null);
    }

    /// <summary>
    /// Keep the focused unit as the vanilla "hovered" actor so relationship arrows draw
    /// when the matching cursor-arrow options are already enabled.
    /// Safe to call every frame; no-op when idle is off or there is no focus.
    /// </summary>
    public static void PinFocusActor()
    {
        if (!SpectatorMode.Active || !MoveCamera.hasFocusUnit())
        {
            return;
        }

        Actor focus = MoveCamera._focus_unit;
        if (focus == null || !focus.isAlive())
        {
            return;
        }

        UnitSelectionEffect.setLastActor(focus);
    }

    public static bool IsPinnedToFocus()
    {
        if (!SpectatorMode.Active || !MoveCamera.hasFocusUnit())
        {
            return false;
        }

        Actor focus = MoveCamera._focus_unit;
        return focus != null
               && focus.isAlive()
               && UnitSelectionEffect.last_actor == focus;
    }
}