defrain-shooter-unity/Assets/Scripts/Weapons/WeaponManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Mirror;


public class WeaponManager : NetworkBehaviour
{
    public int currentWeaponIndex = 0;
    public GameObject[] activeWeapons;

    [SerializeField] Camera cam;

    private void Awake()
    {
        activeWeapons = new GameObject[4];
    }

    void Update() {
        if (isLocalPlayer) {
            if(Input.GetAxis("Mouse ScrollWheel") > 0f){ // Scroll up
                if (currentWeaponIndex <= 0) 
                { currentWeaponIndex = activeWeapons.Length; }
                else { currentWeaponIndex--; }
            }else if (Input.GetAxis("Mouse ScrollWheel") < 0f){ // Scroll down
                if (currentWeaponIndex >= activeWeapons.Length) 
                { currentWeaponIndex = 0; }
                else {  currentWeaponIndex++; }
            }

            if (Input.GetButton("Interact")) // e
            {
                CmdPickupWeapon();
            
            }else if (Input.GetButton("Drop")) // q Droping weapon
            {
                activeWeapons[currentWeaponIndex] = null;
            }
        }
    }

    [Command]
    private void CmdPickupWeapon() {
        if (Physics.Raycast(cam.transform.position, cam.transform.forward, out RaycastHit hit)) 
        {
            if (hit.transform.tag == "Weapon") // If Object is a weapon and the weapon is not in the current active weapons
            {
                Destroy(hit.transform.gameObject);
                switch (hit.transform.GetComponent<Weapon>().WeaponKind.ToString()) // Adding weapon to inventory slot
                {
                    case "Rifle": activeWeapons[0] = hit.transform.gameObject; break;
                    case "Pistole": activeWeapons[1] = hit.transform.gameObject; break;
                    case "Knife": activeWeapons[2] = hit.transform.gameObject; break;
                    case "Grenade": activeWeapons[3] = hit.transform.gameObject; break;
                    default: break;
                }
            }
        }
    }

    private bool isInArray(GameObject[] arr, GameObject searchObj)
    {
        foreach(GameObject obj in arr)
        {
            if (obj == searchObj) return true;
        }
        return false;
    }

}