using System.Collections;
using UnityEngine;

namespace SpellBoundAR.Items.VFX
{
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Item))]
    public class ItemVFXVisibilityScaling : MonoBehaviour
    {
        [SerializeField] private float animationSeconds = .3f;
    
        [Header("Cache")]
        private Transform _transform;
        private Item _item;
        private Vector3 _scaleWhenVisible;
        private Vector3 _scaleWhenInvisible = Vector3.zero;

        private Item Item
        {
            get
            {
                if (!_item) _item = GetComponent<Item>();
                return _item;
            }
        }

        private void Awake()
        {
            _transform = transform;
            _scaleWhenVisible = _transform.localScale;
        }

        private void OnEnable()
        {
            Item.OnVisibleChanged += Refresh;
            RefreshImmediate();
        }

        private void OnDisable()
        {
            Item.OnVisibleChanged -= Refresh;
        }

        private void RefreshImmediate()
        {
            StopAllCoroutines();
            _transform.localScale = Item.Visible
                ? _scaleWhenVisible
                : _scaleWhenInvisible;
        }

        private void Refresh()
        {
            StopAllCoroutines();
            StartCoroutine(_item.Visible
                ? Scale(_transform.localScale, _scaleWhenVisible)
                : Scale(_transform.localScale, _scaleWhenInvisible)
            );
        }

        private IEnumerator Scale(Vector3 startScale, Vector3 endScale)
        {
            float progress = Mathf.InverseLerp(startScale.x, endScale.x, _transform.localScale.x);
            for (float timer = progress * animationSeconds; timer < animationSeconds; timer += Time.deltaTime)
            {
                progress = timer / animationSeconds;
                _transform.localScale = Vector3.Lerp(startScale, endScale, progress);
                yield return null;
            }
            _transform.localScale = endScale;
        }
    }
}