BloodAndGore/Assets/Scripts/Guns/Grenade.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Saltosion.OneWeapon.Effects;

namespace Saltosion.OneWeapon.Guns {
    [RequireComponent(typeof(Bullet))]
    public class Grenade : MonoBehaviour {

        private Bullet Bullet;
        private CustomLight Light;

        [Header("Children")]
        public Rigidbody2D Body;
        public ParticleSystem Explosion;
        public SpriteRenderer Sprite;

        [Header("Values")]
        public float ShootForce = 8;
        public float Torque = 5;
        public float Lifetime = 1;
        public float ExplodeRadius = 3;

        void Start() {
            Bullet = GetComponent<Bullet>();
            Body = GetComponent<Rigidbody2D>();
            Light = GetComponent<CustomLight>();

            Body.SetRotation(Bullet.InitialRotation);
            Body.AddForce(Bullet.Direction.normalized * ShootForce, ForceMode2D.Impulse);
            Body.AddTorque(Random.value * Torque - Torque / 2, ForceMode2D.Impulse);

            Explosion.Stop();
        }

        void Update() {
            Lifetime -= Time.deltaTime;
            if (Lifetime < 0 && !Bullet.HasExploded) {
                Explosion.Play();
                Bullet.HasExploded = true;
                Destroy(Body);
                Destroy(Sprite);
                Bullet.DoDamageAOE(18, ExplodeRadius, 1f);
            }
            if (Lifetime < 0) {
                Light.LightIntensity = Mathf.Max(2 + Lifetime * 6, 0);
            }
            if (Lifetime < -1) {
                Destroy(gameObject);
            }
        }

        private void OnDrawGizmosSelected() {
            Gizmos.color = new Color(1.0f, 0.2f, 0.2f, 0.8f);
            Gizmos.DrawWireSphere(transform.position, ExplodeRadius);
        }
    }
}