BloodAndGore/Assets/Scripts/Guns/Gun.cs

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

namespace Saltosion.OneWeapon.Guns {
    public class Gun : MonoBehaviour {

        [Header("Essentials")]
        public Bullet Bullet;
        public SpriteRenderer Sprite;
        public float MaxCooldown = 0.5f;
        public float MinCooldown = 0.2f;

        [Header("Effects")]
        public Transform BulletHole;
        public Bobbing Bobbing;
        public ParticleSystem LaunchExplosion;
        public CustomLight LaunchLight;
        public float LaunchLightIntensity = 2;
        public float LaunchLightIntensityDegrade = 2;

        private bool IsHeld = false;
        private float CurrCooldown = 0;
        private float CurrLaunchLight = 0;

        private Bullet CurrentBullet;
        private bool HasShotBullet = false;

        private float BulletHoleOriginalY;

        void Start() {
            BulletHoleOriginalY = BulletHole.localPosition.y;
            if (LaunchExplosion != null) {
                LaunchExplosion.Stop();
            }
        }

        void Update() {
            if (CurrCooldown > 0) {
                CurrCooldown -= Time.deltaTime;
            }

            if (HasShotBullet && (CurrentBullet.HasExploded || CurrentBullet == null)) {
                CurrCooldown = Mathf.Min(CurrCooldown, MinCooldown);
                CurrentBullet = null;
                HasShotBullet = false;
            }

            if (CurrLaunchLight > 0) {
                CurrLaunchLight -= Time.deltaTime * LaunchLightIntensityDegrade;
                LaunchLight.LightIntensity = CurrLaunchLight;
            }
        }

        void OnCollisionEnter2D(Collision2D collision) {
            if (IsHeld) {
                return;
            }
            PlayerController Player = collision.collider.GetComponent<PlayerController>();
            if (Player != null) {
                IsHeld = true;
                Bobbing.BobbingMultiplier = 0;
                Destroy(GetComponent<BoxCollider2D>());
                Destroy(GetComponent<Rigidbody2D>());
                Player.SetGun(this);
            }
        }

        public bool Shoot(Vector2 direction, float rotation) {
            if (Bullet == null) {
                Debug.LogError("THERE IS NO BULLET");
            } else {
                if (CurrCooldown <= 0) {
                    CurrCooldown = MaxCooldown;
                    if (LaunchExplosion != null) {
                        LaunchExplosion.Play();
                    }
                    if (LaunchLight != null) {
                        CurrLaunchLight = LaunchLightIntensity;
                        LaunchLight.LightIntensity = CurrLaunchLight;
                    }

                    Bullet ShotBullet = Instantiate(Bullet, BulletHole.position, new Quaternion());
                    ShotBullet.Direction = direction.normalized;
                    ShotBullet.InitialRotation = rotation;

                    CurrentBullet = ShotBullet;
                    HasShotBullet = true;
                    return true;
                }
            }
            return false;
        }

        public void FlipGun(bool flipped) {
            Sprite.flipY = flipped;
            float y = BulletHoleOriginalY;
            if (flipped) {
                y = -y;
            }
            BulletHole.localPosition = new Vector2(BulletHole.localPosition.x, y);
        }
    }
}