ZeroVR/ZeroPacientVR/Assets/Scripts/VR/GrenadeWeapon.cs

using System;
using System.Collections;
using System.Collections.Generic;
using FMOD.Studio;
using FMODUnity;
using HurricaneVR.Framework.Components;
using HurricaneVR.Framework.Core;
using HurricaneVR.Framework.Core.Grabbers;
using HurricaneVR.Framework.Core.Utils;
using HurricaneVR.Framework.Weapons;
using UnityEngine;
using STOP_MODE = FMOD.Studio.STOP_MODE;

public class GrenadeWeapon : MonoBehaviour
{
    [Header("Grenade")]
    [SerializeField] private float delayToDamage = 0.2f;
    [SerializeField] private LayerMask mask;
    [SerializeField] private float radius;
    [SerializeField] private float upDistance = 1f;
    [SerializeField] private float delayToExplosion;
    [SerializeField] private HVRDamageProvider damageProvider;
    [SerializeField] private List<Collider> toCheckColliders;

    [Header("Sound")]
    [SerializeField] private EventReference soundRef;
    [SerializeField] private AnimationCurve soundCurve;
    private EventInstance soundInstance;

    [Header("Setup")] 
    [SerializeField] private HVRGrabbable grabbable;
    [SerializeField] private GrenadeActivator activator;
    [SerializeField] private GameObject explosionFx;
    [SerializeField] private HVRGunSounds sounds;
    [SerializeField] private Renderer buttonRender;
    [SerializeField] private Material buttonMaterial;
    [SerializeField] private float offset;
    [SerializeField] private Color emissionColor;

    [SerializeField] private bool isDebug;
    
    private static readonly int emissionColorId = Shader.PropertyToID("_EmissionColor");
    private bool isReady;
    
    private void Start()
    {
        soundInstance = RuntimeManager.CreateInstance(soundRef);
        RuntimeManager.AttachInstanceToGameObject(soundInstance, gameObject.transform);
        buttonMaterial = buttonRender.material;
        activator.OnReady += OnReady;
        
        grabbable.HandGrabbed.AddListener(Grab);
        grabbable.HandReleased.AddListener(Release);
    }
    

    private void OnDestroy()
    {
        activator.OnReady -= OnReady;
        
        grabbable.HandGrabbed.RemoveListener(Grab);
        grabbable.HandReleased.RemoveListener(Release);
    }

    
    private void Grab(HVRHandGrabber arg0, HVRGrabbable hvrGrabbable)
    {
    }

    private void Release(HVRGrabberBase arg0, HVRGrabbable hvrGrabbable)
    {
        if(isReady)
        {
            OnActivator();
            isReady = false;
        }
    }
    
    private void OnReady()
    {
        sounds.PlaySlideForward();
        StartCoroutine(Ready());

    }

    IEnumerator Ready()
    {
        activator.OnReady -= OnReady;
        isReady = true;
        soundInstance.stop(STOP_MODE.IMMEDIATE);
        soundInstance.start();
        var t = 0f;
        var inverse = false;
        while(t >= 0f)
        {
            if(!inverse) t += Time.deltaTime;
            if(inverse) t -= Time.deltaTime;
            if(t >= 1f)
            {
                t = 1f;
                inverse = true;
            }
            t = Mathf.Clamp01(t);
            var c = emissionColor * t;
            buttonMaterial.SetVector(emissionColorId, c);
            yield return null;
        }
        soundInstance.stop(STOP_MODE.IMMEDIATE);
    }
    
    private void OnActivator()
    {
        StartCoroutine(WaitAndExplosion());
    }
    
    private IEnumerator WaitAndExplosion()
    {
        var t = 0f;
        var soundActivate = false;
        while(t <= delayToExplosion)
        {
            t += Time.deltaTime;
            var ev = soundCurve.Evaluate(t);

            if(ev > 0.9f && !soundActivate)
            {
                soundActivate = true;
                soundInstance.stop(STOP_MODE.IMMEDIATE);
                soundInstance.start();
            }
            else if(ev < 0.8 && soundActivate)
            {
                soundActivate = false;
            }

            var c = emissionColor * ev;
            buttonMaterial.SetVector(emissionColorId, c);
            yield return null;
        }
        soundInstance.stop(STOP_MODE.IMMEDIATE);
        soundInstance.release();

        IEnumerator DelayHit()
        {
            yield return new WaitForSeconds(delayToDamage);
            var hits = PhysicsExtension.SphereCastAll(transform.position, radius, Vector3.up, upDistance, mask, QueryTriggerInteraction.Ignore);
            foreach(var raycastHit in hits)
            {
                var handler = raycastHit.collider.GetComponent<HVRDamageHandlerBase>();
                if(handler)
                {
                    var position = transform.position;
                    var dir = (position - raycastHit.point).normalized;
                    var ray = new Ray(raycastHit.point + dir * offset, dir);

                    var isRay = Physics.Raycast(ray, out var rayHit, Mathf.Infinity, mask, QueryTriggerInteraction.Ignore);
                    if(isRay)
                    {
                        if(toCheckColliders.Contains(rayHit.collider))
                        {
                            handler.HandleRayCastHit(damageProvider, raycastHit);
                            handler.HandleDamageProvider(damageProvider, raycastHit.point, dir.normalized);
                        }
                    }
                }
            }
            Destroy(gameObject);
        }

        StartCoroutine(DelayHit());

        var expInstantiate = Instantiate(explosionFx, transform.position, Quaternion.identity);
        Destroy(expInstantiate, 2f);
    }
    
    private void OnDrawGizmos()
    {
        if (!isDebug) return;
        
        var color = Gizmos.color;

        Gizmos.DrawWireSphere(transform.position, radius);
        
        var hits = PhysicsExtension.SphereCastAll(transform.position, radius, Vector3.up, upDistance, mask, QueryTriggerInteraction.Ignore);
        foreach(var raycastHit in hits)
        {
            var handler = raycastHit.collider.GetComponent<HVRDamageHandlerBase>();
            if(handler)
            {
                var position = transform.position;
                var dir = (position - raycastHit.point).normalized;
                var ray = new Ray(raycastHit.point + dir * offset, dir);

                Gizmos.color = Color.yellow;
                Gizmos.DrawWireSphere(raycastHit.point, 0.05f);
                
                var isRay = Physics.Raycast(ray, out var rayHit, Mathf.Infinity, mask, QueryTriggerInteraction.Ignore);
                if(isRay)
                {
                    if(toCheckColliders.Contains(rayHit.collider))
                    {
                        Debug.DrawLine(raycastHit.point, rayHit.point);
                    }
                    else
                    {
                        Gizmos.color = Color.red;
                        Gizmos.DrawWireSphere(rayHit.point, 0.05f);
                        Debug.DrawLine(raycastHit.point, rayHit.point);
                    }
                }
            }
        }

        Gizmos.color = color;
    }
}