slowpoker/Assets/Scripts/Network/CustomNetworkManager.cs

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

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

    public override void OnStartServer()
    {
        if (PlayerInMenu != null && PlayerInMenu.scene.IsValid())
        {
            Destroy(PlayerInMenu);
        }
        else
        {
            Debug.LogWarning("PlayerInMenu is not a valid scene instance.");
        }

        spawnPrefabs = Resources.LoadAll<GameObject>("SpawnablePrefabs").ToList();
    }

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

        foreach (var prefab in spawnablePrefabs)
        {
            NetworkClient.RegisterPrefab(prefab);
        }
        
        if(PlayerInMenu != null) DestroyImmediate(PlayerInMenu, true);
    }

    // ReSharper disable Unity.PerformanceAnalysis
    public override void OnServerAddPlayer(NetworkConnectionToClient conn)
    {
        Debug.Log("OnServerAddPlayer");
        // if (SceneManager.GetActiveScene().path == menuScene)
        // {
            NetworkRoomPlayerLobby player = Instantiate(gamePlayerPrefab);
            NetworkServer.AddPlayerForConnection(conn, player.gameObject);
            GamePlayers.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>();

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

        
        base.OnServerDisconnect(conn);
    }

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

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

    public void StartGame()
    {
        ServerChangeScene("Demo");
        Debug.Log("GAME STARTING");
    }

    // public override void ServerChangeScene(string newSceneName)
    // {
        // Debug.Log("sss");
        // if(SceneManager.GetActiveScene().path == menuScene && newSceneName.StartsWith("Demo")) 
        // {
        //     Debug.Log("YES");
        //     int newNum = GamePlayers.Count;
        //     for (int i = 0; i < newNum; i++)
        //     {
        //         var conn = GamePlayers[0].connectionToClient;
        //         var gameplayerInstance = Instantiate(gamePlayerPrefab);
        //         Debug.Log(gameplayerInstance.transform.position);
        //
        //         NetworkServer.Destroy(conn.identity.gameObject);
        //         NetworkServer.ReplacePlayerForConnection(conn, gameplayerInstance.gameObject, true);
        //     }        
        // }
        //
        // base.ServerChangeScene(newSceneName);
    // }
}