using System;
using System.Threading;
using Cysharp.Threading.Tasks;
using RebootKit.Engine.Foundation;
using RebootKit.Engine.Services.Console;
using RebootKit.Engine.Services.Game;
using RebootKit.Engine.Services.Input;
using RebootKit.Engine.Services.Simulation;
using UnityEngine;
using UnityEngine.Assertions;
using UnityEngine.Events;
using Logger = RebootKit.Engine.Foundation.Logger;

namespace RebootKit.Engine {
    public partial class RR : IDisposable {
        internal static RR s_Shared;

        static readonly Logger s_logger = new("RR");

        ConsoleService m_ConsoleService;
        DIContext m_DIContext;

        EngineConfigAsset m_EngineConfigAsset;
        GameService m_GameService;
        InputService m_InputService;
        WorldService m_WorldService;

        readonly UnityEvent<string, CVarValue> m_CVarChanged = new();

        public void Dispose() {
            m_CVarChanged.RemoveAllListeners();
        }

        public async UniTask Init(EngineConfigAsset configAsset, CancellationToken cancellationToken) {
            Assert.IsNotNull(configAsset, "Config asset is required");
            
            s_logger.Info("Waking up");
            m_EngineConfigAsset = configAsset;

            m_DIContext = new DIContext();
            m_DIContext.AddInjector(new CVarFieldInjector());

            CreateCoreServices();
            InitializeAppStateMachine();

            await UniTask.Yield(cancellationToken);
        }

        public void Run() {
            OpenMainMenu();
        }

        TService CreateService<TService>(ServiceAsset<TService> asset) where TService : class, IService {
            TService service = asset.Create(m_DIContext);
            m_DIContext.Bind(service);
            return service;
        }

        void CreateCoreServices() {
            s_logger.Debug("Registering core services");

            m_ConsoleService = CreateService(m_EngineConfigAsset.coreServices.consoleService);
            m_InputService = CreateService(m_EngineConfigAsset.coreServices.inputService);
            m_WorldService = CreateService(m_EngineConfigAsset.coreServices.worldService);
            m_GameService = CreateService(m_EngineConfigAsset.coreServices.gameService);
        }
    }
}