UDRIGEEKCup2024/Assets/Obstacles/Bomb.cs

using System;
using System.Collections;
using UnityEngine;

namespace MAVRIC.GEEKCup.Obstacles
{
    public class Bomb : MonoBehaviour
    {
        public float explosionTimeSeconds = 0.1f;
        public float force = 10.0f;
        public GameObject modelObject;
        public SphereCollider explosionCollider;
        public ParticleSystem ParticleSystem;
        public float maxExplosionRadius = 10.0f;
        public float maxDonutRadius = 10.0f;


        public ParticleSystem.ShapeModule editableShape;

        public bool primed;
        private bool isBlowingUp;
        private bool primeTimedOut;

        private void Start()
        {
            StartCoroutine(Timeout());
            IEnumerator Timeout()
            {
                yield return new WaitForSeconds(2.5f);
                BombBlowUp();
            }
        }

        private void OnCollisionEnter(Collision collision)
        {
            if(primeTimedOut) return;
            if (!primed)
            {
                primed = true;
                primeTimedOut = true;

                StartCoroutine(TimeOut());
                
                IEnumerator TimeOut()
                {
                    yield return new WaitForSeconds(0.1f);
                    primeTimedOut = false;
                }
                
                return;
            }
            BombBlowUp();
        }

        private void BombBlowUp()
        {
            if (isBlowingUp) return;
            isBlowingUp = true;
            ParticleSystem.gameObject.SetActive(true);

            editableShape = ParticleSystem.shape;

            StartCoroutine(Disappear());

            IEnumerator Disappear()
            {
                yield return new WaitForSeconds(explosionTimeSeconds / 3.0f);
                modelObject.SetActive(false);
                ParticleSystem.gameObject.transform.SetParent(null);
                ParticleSystem.gameObject.transform.rotation = Quaternion.identity;
                ParticleSystem.Play();
                explosionCollider.gameObject.SetActive(true);
                for (float timer = 0; timer < explosionTimeSeconds; timer += Time.deltaTime)
                {
                    float percent = timer / explosionTimeSeconds;
                    float radius = Mathf.Lerp(1, maxExplosionRadius, percent);
                    float donut = Mathf.Lerp(1, maxDonutRadius, percent);
                    editableShape.radius = radius;
                    editableShape.donutRadius = donut;
                    yield return null;
                }
                while (ParticleSystem.IsAlive()) yield return null;
                Destroy(gameObject);
                Destroy(ParticleSystem.gameObject);
            }
        }


        public void OnTriggerEnter(Collider other)
        {
            Rigidbody body = other.attachedRigidbody;
            if (body == null) return;

            body.AddExplosionForce(force,transform.position,explosionCollider.radius);
        }
    }
}