using HarmonyLib;

namespace IdleSpectator;

/// <summary>
/// Idle pins <see cref="UnitSelectionEffect.last_actor"/> so relationship arrows draw.
/// That same pin would always show the focus unit tip via
/// <see cref="CursorTooltipHelper.updateGameplayTooltip"/>.
/// Allow tips for a real cursor unit or the dossier live sprite; suppress the pin tip on empty world / dossier chrome.
/// </summary>
[HarmonyPatch(typeof(CursorTooltipHelper), nameof(CursorTooltipHelper.updateGameplayTooltip))]
internal static class FocusTooltipPatches
{
    [HarmonyPrefix]
    private static bool Prefix(ref bool __result, ref Actor __state)
    {
        __state = null;
        if (!SpectatorMode.Active)
        {
            return true;
        }

        // Live sprite: tip for the focused unit (last_actor is already pinned).
        if (WatchCaption.IsPointerOverAvatar())
        {
            return true;
        }

        // Dossier chrome (not the sprite): no tip.
        if (WatchCaption.IsPointerOverPanel())
        {
            Tooltip.hideTooltip();
            __result = false;
            return false;
        }

        Actor near = GetActorNearCursorSafe();
        if (near != null && near.isAlive())
        {
            // Real world hover: briefly use that unit for the tip, then restore the pin.
            __state = UnitSelectionEffect.last_actor;
            UnitSelectionEffect.setLastActor(near);
            return true;
        }

        // Empty world (grass, water, etc.): do not leak the idle focus tip.
        Tooltip.hideTooltip();
        __result = false;
        return false;
    }

    [HarmonyPostfix]
    private static void Postfix(Actor __state)
    {
        if (__state != null)
        {
            UnitSelectionEffect.setLastActor(__state);
        }
    }

    private static Actor GetActorNearCursorSafe()
    {
        try
        {
            if (World.world == null || ControllableUnit.isControllingUnit())
            {
                return null;
            }

            return World.world.getActorNearCursor();
        }
        catch
        {
            return null;
        }
    }
}