using System;
using System.Collections.Generic;
using ShiroginSDK.Runtime.Modules.IAP.Enums;
using UnityEngine;

namespace ShiroginSDK.Runtime.Modules.Data.Scripts
{
    [Serializable]
    public class ProductPurchase
    {
        public string ProductId;
        public int PurchaseCount;
        public long LastPurchaseUnix;
        public StoreCategory StoreCategory;

        public ProductPurchase(string id, int count, long unix, StoreCategory type = StoreCategory.UnknownPacks)
        {
            ProductId = id;
            PurchaseCount = count;
            LastPurchaseUnix = unix;
            StoreCategory = type;
        }
    }

    [Serializable]
    public class LimitedOfferState
    {
        public string OfferId;
        public bool Seen;
        public bool Purchased;
        public long ExpireUnix; // 0 = unlimited

        public bool IsActive(long nowUnix)
        {
            return ExpireUnix == 0 || nowUnix < ExpireUnix;
        }
    }

    [Serializable]
    public class StoreData : BaseData
    {
        public const string REMOVE_ADS_PRODUCT_ID = "remove_ads";

        public List<ProductPurchase> Purchases = new();
        public List<LimitedOfferState> LimitedOffers = new();
        public long DailyShopNextRefreshUnix;
        protected override string PrefsKey => "STORE_DATA";

        // --------------------------------------------------------------------
        // 🚫 REMOVE ADS
        // --------------------------------------------------------------------
        public bool HasRemovedAds => HasPurchased(REMOVE_ADS_PRODUCT_ID);

        private static long NowUnix()
        {
            return DateTimeOffset.UtcNow.ToUnixTimeSeconds();
        }

        private ProductPurchase FindPurchase(string pid)
        {
            return Purchases.Find(p => p.ProductId == pid);
        }

        private LimitedOfferState FindOffer(string oid)
        {
            return LimitedOffers.Find(o => o.OfferId == oid);
        }

        // --------------------------------------------------------------------
        // 🧾 PURCHASE MANAGEMENT
        // --------------------------------------------------------------------
        public void MarkPurchased(string productId, int count = 1, StoreCategory type = StoreCategory.UnknownPacks)
        {
            if (string.IsNullOrEmpty(productId))
            {
                Debug.LogWarning("[StoreData] Tried to mark a purchase with null/empty productId.");
                return;
            }

            var existing = FindPurchase(productId);

            if (existing == null)
            {
                Purchases.Add(new ProductPurchase(productId, Mathf.Max(1, count), NowUnix(), type));
            }
            else
            {
                existing.PurchaseCount += Mathf.Max(1, count);
                existing.LastPurchaseUnix = NowUnix();
                existing.StoreCategory = type;
            }

            Save();
            Debug.Log($"[StoreData] ✅ Purchase marked → {productId} ({type})");
        }

        public int GetPurchaseCount(string productId)
        {
            return FindPurchase(productId)?.PurchaseCount ?? 0;
        }

        public bool HasPurchased(string productId)
        {
            return GetPurchaseCount(productId) > 0;
        }

        public int GetTotalPurchased(StoreCategory type)
        {
            var total = 0;
            foreach (var p in Purchases)
                if (p.StoreCategory == type)
                    total += p.PurchaseCount;
            return total;
        }

        public bool HasPurchasedType(StoreCategory type)
        {
            return Purchases.Exists(p => p.StoreCategory == type);
        }

        public void ResetPurchases(StoreCategory type)
        {
            Purchases.RemoveAll(p => p.StoreCategory == type);
            Save();
            Debug.Log($"[StoreData] 🔄 Reset purchases of type {type}");
        }

        public void SetRemoveAds(bool purchased)
        {
            if (purchased)
                MarkPurchased(REMOVE_ADS_PRODUCT_ID, 1, StoreCategory.RemoveAdsPacks);
            else
                Purchases.RemoveAll(p => p.ProductId == REMOVE_ADS_PRODUCT_ID);

            Save();
            Debug.Log($"[StoreData] 🧩 Remove Ads state updated → {purchased}");
        }

        // --------------------------------------------------------------------
        // 🕒 DAILY SHOP
        // --------------------------------------------------------------------
        public void SetDailyShopRefresh(long nextUnix)
        {
            DailyShopNextRefreshUnix = nextUnix;
            Save();
        }

        public bool NeedsDailyShopRefresh(long nowUnix)
        {
            return nowUnix >= DailyShopNextRefreshUnix;
        }

        public void ForceRefreshNow(int hoursToNext = 24)
        {
            DailyShopNextRefreshUnix = NowUnix() + hoursToNext * 3600L;
            Save();
        }

        // --------------------------------------------------------------------
        // 🎁 LIMITED OFFERS
        // --------------------------------------------------------------------
        public void UpsertOffer(string offerId, long expireUnix = 0)
        {
            var offer = FindOffer(offerId);
            if (offer == null)
                LimitedOffers.Add(new LimitedOfferState
                {
                    OfferId = offerId,
                    Seen = false,
                    Purchased = false,
                    ExpireUnix = expireUnix
                });
            else
                offer.ExpireUnix = expireUnix;

            Save();
        }

        public void MarkOfferSeen(string offerId)
        {
            var offer = FindOffer(offerId);
            if (offer == null) return;
            offer.Seen = true;
            Save();
        }

        public bool IsOfferActive(string offerId)
        {
            var offer = FindOffer(offerId);
            return offer != null && offer.IsActive(NowUnix());
        }

        public void MarkOfferPurchased(string offerId)
        {
            var offer = FindOffer(offerId);
            if (offer == null) return;
            offer.Purchased = true;
            Save();
        }
    }
}