CapersProject/Assets/02.Scripts/Character/Enemy/Boss/TitanSlime/TitanSlimeAttackedParticle.cs

using System.Collections;
using System.Collections.Generic;
using BlueWater.Maps;
using UnityEngine;

namespace BlueWater.Enemies.Bosses.TitanSlime
{
    public class TitanSlimeAttackedParticle : MonoBehaviour
    {
        private ParticleSystem _titanSlimeAttackedParticle;
        
        [SerializeField]
        private Vector2 _randomDestroy = new(5f, 7f); 
        
        [SerializeField]
        private GameObject[] _stainPrefabs;
        
        private Transform _instantiateLocation;
        private List<ParticleCollisionEvent> _collisionEvents;

        private void Start()
        {
            _titanSlimeAttackedParticle = GetComponent<ParticleSystem>(); 
            _instantiateLocation = FindAnyObjectByType<TitanSlimeMapController>().ParticleInstanceLocation;
            _collisionEvents = new List<ParticleCollisionEvent>();
        }

        private void OnParticleCollision(GameObject other)
        {
            var numCollisionEvents = _titanSlimeAttackedParticle.GetCollisionEvents(other, _collisionEvents);
            for (var i = 0; i < numCollisionEvents; i++)
            {
                InstantiateStain(_collisionEvents[i].intersection);
            }
        }

        private void InstantiateStain(Vector3 position)
        {
            position.y += 0.01f;
            var stain = Instantiate(_stainPrefabs[Random.Range(0, _stainPrefabs.Length)], position, Quaternion.Euler(90, 0, 0), _instantiateLocation);
            var randomDestroyTime = Random.Range(_randomDestroy.x, _randomDestroy.y);
            StartCoroutine(DestroyStainCoroutine(stain, randomDestroyTime));
        }

        private IEnumerator DestroyStainCoroutine(GameObject stain, float destroyTime)
        {
            var elapsedTime = 0f;
            while (elapsedTime < destroyTime)
            {
                elapsedTime += Time.deltaTime;

                var remainingTime = destroyTime - elapsedTime;
                if (remainingTime < 0.5f)
                {
                    stain.transform.localScale = Vector3.one * (remainingTime / 0.5f);
                }
                yield return null;
            }
            Destroy(stain);
        }
    }
}