#nullable enable

using ShrinkEventBus;
using UnityEngine;

namespace ShrinkDataSaver.Integration
{
    /// <summary>
    /// DataSaver 原生事件到 EventBus 的显式桥接器。
    /// 生命周期由 ShrinkDataSaverEventBusComponent 管理，不再因程序集存在而全局自动接入。
    /// </summary>
    public static class DataSaverEventBusBridge
    {
        private static bool _registered;

        public static bool IsRegistered => _registered;

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        private static void ResetStaticState()
        {
            Unregister();
            _registered = false;
        }

        public static void Register()
        {
            if (_registered)
                return;

            ShrinkSettings.OnChanged += HandleSettingsChanged;
            ShrinkSave.OnSaveStarted += HandleSaveStarted;
            ShrinkSave.OnSaveCompleted += HandleSaveCompleted;
            ShrinkSave.OnSaveFailed += HandleSaveFailed;
            ShrinkSave.OnLoadStarted += HandleLoadStarted;
            ShrinkSave.OnLoadCompleted += HandleLoadCompleted;
            ShrinkSave.OnLoadFailed += HandleLoadFailed;
            ShrinkSave.OnMigrationCompleted += HandleMigrationCompleted;
            ShrinkSave.OnDeleteCompleted += HandleSlotDeleted;
            _registered = true;
        }

        public static void Unregister()
        {
            ShrinkSettings.OnChanged -= HandleSettingsChanged;
            ShrinkSave.OnSaveStarted -= HandleSaveStarted;
            ShrinkSave.OnSaveCompleted -= HandleSaveCompleted;
            ShrinkSave.OnSaveFailed -= HandleSaveFailed;
            ShrinkSave.OnLoadStarted -= HandleLoadStarted;
            ShrinkSave.OnLoadCompleted -= HandleLoadCompleted;
            ShrinkSave.OnLoadFailed -= HandleLoadFailed;
            ShrinkSave.OnMigrationCompleted -= HandleMigrationCompleted;
            ShrinkSave.OnDeleteCompleted -= HandleSlotDeleted;
            _registered = false;
        }

        private static void HandleSettingsChanged(string key, object value) =>
            EventBus.Post(new SettingsChangedEvent { Key = key, Value = value });

        private static void HandleSaveStarted(SaveStartedEventArgs args) =>
            EventBus.Post(new SaveStartedEvent { SlotIndex = args.SlotIndex, Timestamp = args.Timestamp });

        private static void HandleSaveCompleted(SaveCompletedEventArgs args) =>
            EventBus.Post(new SaveCompletedEvent
            {
                SlotIndex = args.SlotIndex,
                ModuleNames = args.ModuleNames,
                Timestamp = args.Timestamp
            });

        private static void HandleSaveFailed(SaveFailedEventArgs args) =>
            EventBus.Post(new SaveFailedEvent
            {
                SlotIndex = args.SlotIndex,
                ErrorMessage = args.ErrorMessage
            });

        private static void HandleLoadStarted(LoadStartedEventArgs args) =>
            EventBus.Post(new LoadStartedEvent { SlotIndex = args.SlotIndex, Timestamp = args.Timestamp });

        private static void HandleLoadCompleted(LoadCompletedEventArgs args) =>
            EventBus.Post(new LoadCompletedEvent
            {
                SlotIndex = args.SlotIndex,
                ModuleNames = args.ModuleNames,
                Version = args.Version,
                Timestamp = args.Timestamp
            });

        private static void HandleLoadFailed(LoadFailedEventArgs args) =>
            EventBus.Post(new LoadFailedEvent
            {
                SlotIndex = args.SlotIndex,
                ErrorMessage = args.ErrorMessage
            });

        private static void HandleMigrationCompleted(MigrationCompletedEventArgs args) =>
            EventBus.Post(new MigrationCompletedEvent
            {
                SlotIndex = args.SlotIndex,
                FromVersion = args.FromVersion,
                ToVersion = args.ToVersion
            });

        private static void HandleSlotDeleted(SlotDeletedEventArgs args) =>
            EventBus.Post(new SlotDeletedEvent { SlotIndex = args.SlotIndex });
    }
}