Driftology/Assets/SessionListUIHandler.cs

using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using Fusion;

public class SessionListUIHandler : MonoBehaviour
{
    public TextMeshProUGUI statusText;
    public GameObject sessionItemListPrefab;
    public VerticalLayoutGroup verticalLayoutGroup;

    private List<(SessionInfoUIListItem item, Action<SessionInfo> handler)> activeItems = new();

    public void ClearList()
    {
        foreach (var (item, handler) in activeItems)
        {
            item.OnJoinSession -= handler; // ✅ Correct way to unsubscribe
            Destroy(item.gameObject);
        }

        activeItems.Clear();
        statusText.gameObject.SetActive(false);
    }

    public void AddToList(SessionInfo sessionInfo, Action<SessionInfo> onJoinCallback)
    {
        var item = Instantiate(sessionItemListPrefab, verticalLayoutGroup.transform)
            .GetComponent<SessionInfoUIListItem>();

        item.SetSessionInfo(sessionInfo);
        item.OnJoinSession += onJoinCallback;

        activeItems.Add((item, onJoinCallback)); // store pair for clean removal
    }

    public void ShowNoSessionsMessage(string message = "No Game Sessions Found")
    {
        statusText.text = message;
        statusText.gameObject.SetActive(true);
    }
}