using System;
using System.Collections;
using TMPro;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.XR.Interaction.Toolkit;

namespace Interactions
{
    public class XRScroll : XRBaseInteractable
    {
        private bool isTracking;
        
        [SerializeField] private Vector3 scrollAxis = Vector3.up;
        [SerializeField] private float scrollScale = 1000;

        public UnityEvent<float> scrollUpdated;


        protected override void OnDisable()
        {
            base.OnDisable();
            isTracking = false;
            StopAllCoroutines();
        }


        public void OnSelected(SelectEnterEventArgs args)
        {
            StartCoroutine(TrackScrolling(args.interactorObject.transform));
        }

        private IEnumerator TrackScrolling(Transform mover)
        {
            if (isTracking) yield break;
            isTracking = true;
            Vector3 previousPos = mover.position;

            while (isTracking)
            {
                yield return null;

                Vector3 currentPos = mover.position;

                //Calculate the difference in position only along one axis
                Vector3 diff = (previousPos - currentPos);
                diff = new Vector3(diff.x * scrollAxis.x, diff.y * scrollAxis.y, diff.z * scrollAxis.z);
                float diffTotal = (diff.x + diff.y + diff.z) * scrollScale;
                
                previousPos = currentPos;
                scrollUpdated?.Invoke(diffTotal);
            }
        }

        public void OnUnSelected(SelectExitEventArgs args)
        {
            isTracking = false;
        }
        
        
    }
}