using System;
using ShiroginSDK.Runtime.Core.SDK;
using ShiroginSDK.Runtime.Modules.Data.Scripts;
using ShiroginSDK.Runtime.Modules.Events;
using ShiroginSDK.Runtime.Modules.IAP.Scripts.SO;
using ShiroginSDK.Runtime.Services.Base;
using ShiroginSDK.Runtime.Services.Interfaces;
using UnityEngine;
using UnityEngine.Purchasing;

namespace ShiroginSDK.Runtime.Services.Implementations.IAP
{
    /// <summary>
    ///     Handles Unity IAP initialization, purchases, and rewards through StoreRepository.
    /// </summary>
    public class IAPService : ServiceBase, IIAPService, IStoreListener
    {
        private ShiroginConfig _config;
        private IDataService _dataService;

        private IEventService _eventService;
        private IStoreController _storeController;
        private IExtensionProvider _storeExtensions;

        public bool IsInitialized => _storeController != null;
        public StoreRepository StoreRepository => _config?.storeRepository;

        // -------------------------------------------------------
        // Public API
        // -------------------------------------------------------
        public void Buy(StoreItem item, Action<StoreItem> onSuccess = null)
        {
            if (item == null)
            {
                Debug.LogError("[IAPService] ❌ Cannot buy. StoreItem is null.");
                return;
            }

            Buy(item.productId, success =>
            {
                if (success)
                {
                    Debug.Log($"[IAPService] ✅ Purchase successful for '{item.productId}'");
                    onSuccess?.Invoke(item);
                }
                else
                {
                    Debug.LogWarning($"[IAPService] ⚠️ Purchase failed or cancelled for '{item.productId}'");
                }
            });
        }

        public void Buy(string productId)
        {
            Buy(productId, success =>
            {
                if (success)
                    Debug.Log($"[IAPService] ✅ Purchase successful for '{productId}'");
                else
                    Debug.LogWarning($"[IAPService] ⚠️ Purchase failed or cancelled for '{productId}'");
            });
        }

        public void RestorePurchases()
        {
            if (!IsInitialized)
            {
                Debug.LogWarning("[IAPService] ⚠️ Cannot restore — not initialized.");
                return;
            }

#if UNITY_IOS
            var appleExt = _storeExtensions.GetExtension<IAppleExtensions>();
            appleExt.RestoreTransactions(result => Debug.Log("[IAPService] 🔄 Restore completed: " + result));
#elif UNITY_ANDROID
            foreach (var product in _storeController.products.all)
                if (product.hasReceipt && product.definition.type == ProductType.NonConsumable)
                {
                    var item = GetStoreItem(product.definition.id);
                    item?.GiveReward();
                    Debug.Log($"[IAPService] 🔄 Restored: {product.definition.id}");
                }
#else
            Debug.Log("[IAPService] Restore not supported on this platform.");
#endif
        }

        public string GetLocalizedPriceString(string productId)
        {
            if (!IsInitialized || string.IsNullOrEmpty(productId))
                return string.Empty;

            var p = _storeController.products.WithID(productId);
            return p != null ? p.metadata.localizedPriceString : string.Empty;
        }

        // -------------------------------------------------------
        // IStoreListener
        // -------------------------------------------------------
        public void OnInitialized(IStoreController controller, IExtensionProvider extensions)
        {
            _storeController = controller;
            _storeExtensions = extensions;
            Debug.Log("[IAPService] ✅ Initialized successfully.");
        }

        public void OnInitializeFailed(InitializationFailureReason error)
        {
            Debug.LogError($"[IAPService] ❌ Initialization failed: {error}");
        }

        public void OnInitializeFailed(InitializationFailureReason error, string message)
        {
            Debug.LogError($"[IAPService] ❌ Initialization failed: {error} — {message}");
        }

        public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs args)
        {
            var product = args.purchasedProduct;
            var item = GetStoreItem(product.definition.id);

            if (item != null)
            {
                item.GiveReward();

                var storeData = _dataService?.Get<StoreData>();
                storeData?.MarkPurchased(product.definition.id, 1, item.category);

                _eventService?.Invoke(new ShiroginEvents.Shop.Shop_UIStoreItem_Rewarded(item.GetRewards()));
                _eventService?.Invoke(new ShiroginEvents.IAP.PurchaseCompletedEvent(product));

                Debug.Log($"[IAPService] 🎁 Reward granted for {product.definition.id}");
            }
            else
            {
                Debug.LogWarning($"[IAPService] ⚠️ No StoreItem mapped for {product.definition.id}");
            }

            return PurchaseProcessingResult.Complete;
        }

        public void OnPurchaseFailed(Product product, PurchaseFailureReason failureReason)
        {
            Debug.LogError($"[IAPService] ❌ Purchase failed: {product.definition.id} - {failureReason}");
        }

        // -------------------------------------------------------
        // Initialization
        // -------------------------------------------------------
        protected override void OnInitialize()
        {
            _config = ShiroginConfig.Load();
            _eventService = ServiceLocator.Get<IEventService>();
            _dataService = ServiceLocator.Get<IDataService>();

            if (_config == null || _config.storeRepository == null)
            {
                Debug.LogError("[IAPService] ❌ Initialization failed — Missing SDKConfig or StoreRepository.");
                return;
            }

#if UNITY_EDITOR
            var module = StandardPurchasingModule.Instance(AppStore.NotSpecified);
            module.useFakeStoreAlways = true;
            module.useFakeStoreUIMode = FakeStoreUIMode.StandardUser;
            Debug.Log("[IAPService] 🧩 FakeStore enabled in Editor.");
#else
            var module = StandardPurchasingModule.Instance();
#endif

            var builder = ConfigurationBuilder.Instance(module);
            var allItems = _config.storeRepository.GetAll();

            if (allItems == null || allItems.Count == 0)
            {
                Debug.LogWarning("[IAPService] ⚠️ No products found in StoreRepository.");
                return;
            }

            foreach (var item in allItems)
            {
                if (string.IsNullOrEmpty(item.productId))
                {
                    Debug.LogWarning("[IAPService] Skipped item with empty productId.");
                    continue;
                }

                builder.AddProduct(item.productId, item.productType);
            }

            UnityPurchasing.Initialize(this, builder);
        }

        protected override void OnDispose()
        {
            _storeController = null;
            _storeExtensions = null;
            _eventService = null;
            _dataService = null;
        }

        private void Buy(string productId, Action<bool> callback)
        {
            if (!IsInitialized)
            {
                Debug.LogError("[IAPService] ❌ Not initialized yet.");
                callback?.Invoke(false);
                return;
            }

            var product = _storeController.products.WithID(productId);
            if (product != null && product.availableToPurchase)
            {
                Debug.Log($"[IAPService] 🛒 Purchasing: {productId}");
                _storeController.InitiatePurchase(product);
                callback?.Invoke(true);
            }
            else
            {
                Debug.LogWarning($"[IAPService] ⚠️ Product not available: {productId}");
                callback?.Invoke(false);
            }
        }

        // -------------------------------------------------------
        // Helpers
        // -------------------------------------------------------
        private StoreItem GetStoreItem(string productId)
        {
            if (StoreRepository == null)
                return null;

            return StoreRepository.GetByProductId(productId);
        }
    }
}