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

//async
public class UnityMainThreadDispatcher : MonoBehaviour
{
    private static UnityMainThreadDispatcher instance;
    private readonly Queue<Action> actions = new Queue<Action>();

    public static UnityMainThreadDispatcher Instance
    {
        get
        {
            if (instance == null)
            {
                var go = new GameObject("MainThreadDispatcher");
                instance = go.AddComponent<UnityMainThreadDispatcher>();
                DontDestroyOnLoad(go);
            }
            return instance;
        }
    }

    public void Enqueue(Action action)
    {
        lock (actions)
        {
            actions.Enqueue(action);
        }
    }

    private void Update()
    {
        lock (actions)
        {
            while (actions.Count > 0)
            {
                actions.Dequeue()?.Invoke();
            }
        }
    }
}