using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Text.RegularExpressions;
using ExitGames.Client.Photon;
using ExitGames.Client.Photon.Chat;
using HarmonyLib;
using Svelto.Context;

namespace CLre_server.Tweaks.Chat
{
    public class ChatConnectionEngine: API.Engines.ServerEnginePostBuild, IWaitForFrameworkInitialization, IWaitForFrameworkDestruction
    {
        private bool _running = false;
        private ChatClient _chatClient;
        private ChatListener _chatListener;

        public delegate void CommandHandler(Match messageMatch, ChatClient connection, string username);

        private Dictionary<ChatCommandAttribute, CommandHandler> _handlers;
        
        internal static List<Assembly> _assembliesToCheck = new List<Assembly>(new []{typeof(CLre).Assembly});
        
        public override void Ready()
        {
            _running = true;
        }

        private IEnumerator connectify()
        {
            LoadHandlers(); // find & load commands
            // wait for login to succeed (it may never)
            while (!ChatHandler.IsAuthenticationReady && _running)
            {
                yield return null;
            }
            // login with authenticated credentials
            // shout-out to however made an identical AuthenticationValues struct in the global namespace
            ExitGames.Client.Photon.Chat.AuthenticationValues auth = new ExitGames.Client.Photon.Chat.AuthenticationValues();
            auth.AuthType = ExitGames.Client.Photon.Chat.CustomAuthenticationType.Custom;
            auth.AddAuthParameter("publicId", ChatHandler.PublicId);
            auth.AddAuthParameter("token", ChatHandler.Token);
            auth.UserId = ChatHandler.PublicId;
            _chatListener= new ChatListener(_handlers);
            _chatClient = new ChatClient(_chatListener, ConnectionProtocol.Udp);
            _chatListener.ChatClient = _chatClient;
            _chatClient.Connect(Game.Utilities.CardLifePhotonSettings.PhotonChatAppID, "1.0", auth);
            // run forever (until server shutsdown)
            while (_running)
            {
                _chatClient.Service();
                yield return null;
            }
        }

        public void OnFrameworkInitialized()
        {
            connectify().Run();
        }

        public void OnFrameworkDestroyed()
        {
            _running = false;
        }
        
        private void LoadHandlers()
        {
            _handlers = new Dictionary<ChatCommandAttribute, CommandHandler>();
            foreach (Assembly asm in _assembliesToCheck.ToArray())
            {
                foreach (Type t in asm.GetTypes())
                {
                    foreach (MethodInfo m in t.GetMethods(AccessTools.all))
                    {
                        ChatCommandAttribute attr = m.GetCustomAttribute<ChatCommandAttribute>();
                        if (attr != null)
                        {
                            // TODO validate that method signature matches that of CommandHandler
                            API.Utility.Logging.MetaLog($"{t.FullName}:{m.Name} is handling {attr.Name}");
                            _handlers.Add(attr, (CommandHandler) Delegate.CreateDelegate(typeof(CommandHandler), m));
                        }
                    }
                }
            }
        }
    }
}