using System;
using System.Collections.Concurrent;
using UnityEngine;

namespace BrewMonster.Scripts.ChatUI
{
    /// <summary>
    /// Responsible for switching chat messages from background threads to Unity main thread.
    /// Only handles chat related actions.
    /// </summary>
    public class ChatThreadDispatcher : MonoSingleton<ChatThreadDispatcher>
    {
        private static readonly ConcurrentQueue<Action> _queue = new ConcurrentQueue<Action>();

        protected override void Awake()
        {
            base.Awake();
            DontDestroyOnLoad(gameObject);
        }

        /// <summary>
        /// Called from ANY thread (network thread safe)
        /// </summary>
        public void Post(Action action)
        {
            if (action == null)
                return;

            _queue.Enqueue(action);
        }

        private void Update()
        {
            while (_queue.TryDequeue(out var action))
            {
                try
                {
                    action?.Invoke();
                }
                catch (Exception e)
                {
                    Debug.LogError($"ChatThreadDispatcher error: {e}");
                }
            }
        }
    }
}