using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;
using UnityEngine.XR.Interaction.Toolkit.Interactors;
using VRShopping.Items;
using VRShopping.UI;

namespace VRShopping.Interact
{
    public class ItemInfoOnGrab : MonoBehaviour
    {
        private ItemData _data;

        private Handedness _lastHand;

        private void Awake()
        {
            ItemInstance itemIns = GetComponent<ItemInstance>();
            if(itemIns != null)
            {
                _data = itemIns.ItemDataInfo;
            }
        }

        public void HandleSelectEntered(SelectEnterEventArgs args)
        {
            if (!TryGetHandedness(args.interactorObject, out var hand)) return;
            if (ItemInfoHud.Instance == null) return;

            _lastHand = hand;
            ItemInfoHud.Instance.Show(hand, _data);
        }

        public void HandleSelectExited(SelectExitEventArgs args)
        {
            if (ItemInfoHud.Instance == null) return;
            ItemInfoHud.Instance.Hide(_lastHand);
        }

        private static bool TryGetHandedness(IXRInteractor interactor, out Handedness hand)
        {
            hand = Handedness.Left;
            if (interactor is XRBaseInputInteractor input)
            {
                switch (input.handedness)
                {
                    case InteractorHandedness.Left: hand = Handedness.Left; return true;
                    case InteractorHandedness.Right: hand = Handedness.Right; return true;
                }
            }
            return false;
        }
    }
}