OTG_6/Assets/_Scripts/Characters/ManaCrystal.cs

using UnityEngine;

namespace OTG.Lab06.Characters
{
    public sealed class ManaCrystal : MonoBehaviour
    {
        [SerializeField] private float restoreAmount = 35f;
        [SerializeField] private float respawnTime = 7f;
        [SerializeField] private GameObject visualRoot;

        private Collider triggerCollider;
        private float cooldown;

        private void Awake()
        {
            triggerCollider = GetComponent<Collider>();
            if (visualRoot == null && transform.childCount > 0)
            {
                visualRoot = transform.GetChild(0).gameObject;
            }
        }

        private void Update()
        {
            transform.Rotate(Vector3.up, 45f * Time.deltaTime, Space.World);

            if (cooldown <= 0f)
            {
                return;
            }

            cooldown -= Time.deltaTime;
            if (cooldown <= 0f)
            {
                SetAvailable(true);
            }
        }

        private void OnTriggerEnter(Collider other)
        {
            PlayerStats stats = other.GetComponentInParent<PlayerStats>();
            if (stats == null || cooldown > 0f)
            {
                return;
            }

            stats.RestoreMana(restoreAmount);
            cooldown = respawnTime;
            SetAvailable(false);
        }

        private void SetAvailable(bool available)
        {
            if (triggerCollider != null)
            {
                triggerCollider.enabled = available;
            }

            if (visualRoot != null)
            {
                visualRoot.SetActive(available);
            }
        }
    }
}