using System;
using UnityEngine;
using VContainer;
using Vanguard.Api;
using Vanguard.Auth;
using Vanguard.Meta;
using Vanguard.State;

namespace Vanguard.App
{
    /// <summary>
    /// Composition root клиента. Живёт между сценами, хранит DI-контейнер и
    /// общие сервисы; сцены отвечают только за 3D-вид и свой UI.
    /// </summary>
    public sealed class VanguardApp : MonoBehaviour
    {
        public static VanguardApp Instance { get; private set; }
        public static string LastInitializationError { get; private set; }

        private IObjectResolver _container;

        public IObjectResolver Container => _container;
        public SceneFlow Flow { get; private set; }

        private void Awake()
        {
            try
            {
                Instance = this;
                DontDestroyOnLoad(gameObject);
                Application.targetFrameRate = 60;

                var config = new AppConfig();
                config.Load();

                var builder = new ContainerBuilder();
                builder.RegisterInstance(config);
                builder.Register<TokenStore>(Lifetime.Singleton);
                builder.Register<PlayerState>(Lifetime.Singleton);
                builder.Register<ApiClient>(Lifetime.Singleton);
                builder.Register<AuthService>(Lifetime.Singleton);
                builder.Register<MetaService>(Lifetime.Singleton);
                builder.Register<SceneFlow>(Lifetime.Singleton);

                _container = builder.Build();
                Flow = _container.Resolve<SceneFlow>();
            }
            catch (Exception exception)
            {
                LastInitializationError = exception.ToString();
                Debug.LogException(exception);
            }
        }

        private void Start()
        {
            if (Flow != null)
                _ = Flow.LoadLoginAsync();
        }

        private void OnDestroy()
        {
            if (Instance == this)
                Instance = null;

            if (_container is IDisposable disposable)
                disposable.Dispose();
        }
    }
}