using UnityEngine;

namespace AlicizaX
{
    public abstract class MonoServiceBehaviour : MonoBehaviour, IMonoService
    {
        public ServiceContext Context { get; private set; }

        public bool IsInitialized { get; private set; }

        protected ServiceWorld World => Context.World;

        protected ServiceScope Scope => Context.Scope;

        void IService.Initialize(ServiceContext context)
        {
            if (IsInitialized)
                throw new System.InvalidOperationException($"{GetType().FullName} is already initialized.");

            Context = context;
            IsInitialized = true;
            OnInitialize();
        }

        void IService.Destroy()
        {
            if (!IsInitialized) return;

            OnDestroyService();
            IsInitialized = false;
            Context = default;
        }

        protected virtual void OnInitialize() { }

        protected virtual void OnDestroyService() { }
    }

    public abstract class MonoServiceBehaviour<TScope> : MonoServiceBehaviour
        where TScope : IScope
    {
        [SerializeField] private bool _dontDestroyOnLoad = false;

        private void Awake()
        {
            OnAwake();
        }

        private void Start()
        {
            var scope = ResolveOrCreateScope();

            if (scope.HasContract(GetType()))
            {
                Destroy(gameObject);
                return;
            }

            if (_dontDestroyOnLoad)
                DontDestroyOnLoad(gameObject);

            scope.Register(this);
        }

        private void OnDestroy()
        {
            if (!IsInitialized) return;
            if (!AppServices.HasWorld) return;
            if (!TryResolveScope(out var scope)) return;

            scope.Unregister(this);
        }

        private static ServiceScope ResolveOrCreateScope()
        {
            if (typeof(TScope) == typeof(AppScope))
                return AppServices.App;

            if (typeof(TScope) == typeof(SceneScope))
                return AppServices.EnsureScene();

            if (typeof(TScope) == typeof(GameplayScope))
                return AppServices.EnsureGameplay();

            throw new System.InvalidOperationException($"Unsupported service scope: {typeof(TScope).FullName}.");
        }

        private static bool TryResolveScope(out ServiceScope scope)
        {
            if (typeof(TScope) == typeof(AppScope))
            {
                scope = AppServices.App;
                return true;
            }

            if (typeof(TScope) == typeof(SceneScope))
                return AppServices.TryGetScene(out scope);

            if (typeof(TScope) == typeof(GameplayScope))
                return AppServices.TryGetGameplay(out scope);

            scope = null;
            return false;
        }

        protected virtual void OnAwake() { }
    }
}