slowpoker/Assets/Scripts/CustomNetworkManager.cs

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

public class CustomNetworkManager : NetworkManager
{
    [Scene] public string menuScene;
    public NetworkRoomPlayerLobby roomPlayerPrefab;
    public List<NetworkRoomPlayerLobby> RoomPlayers = new List<NetworkRoomPlayerLobby>();
    public GameObject PlayerInMenu;
    
    // public static event Action OnClientConnected;
    // public static event Action OnClientDisconnected;

    public override void OnStartServer()
    {
        Destroy(PlayerInMenu);
        spawnPrefabs = Resources.LoadAll<GameObject>("SpawnablePrefabs").ToList();
    }

    // ReSharper disable Unity.PerformanceAnalysis
    public override void OnStartClient()
    {
        Destroy(PlayerInMenu);
        var spawnablePrefabs = Resources.LoadAll<GameObject>("SpawnablePrefabs");

        foreach (var prefab in spawnablePrefabs)
        {
            NetworkClient.RegisterPrefab(prefab);
        }
    }

    // ReSharper disable Unity.PerformanceAnalysis
    public override void OnServerAddPlayer(NetworkConnectionToClient conn)
    {
        Debug.Log("OnServerAddPlayer");
        if (SceneManager.GetActiveScene().name == "Menu")
        {
            NetworkRoomPlayerLobby roomPlayerInstance = Instantiate(roomPlayerPrefab);
            NetworkServer.AddPlayerForConnection(conn, roomPlayerInstance.gameObject);
            RoomPlayers.Add( conn.identity.GetComponent<NetworkRoomPlayerLobby>());
            Debug.Log("Player added");
        }
    }

    public override void OnServerDisconnect(NetworkConnectionToClient conn)
    {
        var networkIdentity = conn.identity;
        
        if (networkIdentity != null)
        {
            // ReSharper disable once Unity.PerformanceCriticalCodeInvocation
            var player = networkIdentity.GetComponent<NetworkRoomPlayerLobby>();

            RoomPlayers.Remove(player);
        }
        Debug.Log("disconnected from Server");

        
        base.OnServerDisconnect(conn);
    }

    public override void OnServerChangeScene(string newSceneName)
    {
        if (newSceneName == "Menu")
        {
            Instantiate(PlayerInMenu);
        }
    }

    public override void OnStopServer()
    {
        // Instantiate(PlayerInMenu);
        RoomPlayers.Clear();
    }
}