using System;
using System.Collections.Generic;
using Unity.Services.Core;
using UnityEngine;
using UnityEngine.Purchasing;
using UnityEngine.Purchasing.Extension;

public class IAPManager : MonoBehaviour, IDetailedStoreListener
{
    public static IAPManager Instance { get; private set; }  // 单例

    private IStoreController controller;
    private IExtensionProvider extensions;

    private string subscriptionId = "quewenYueKa";


    void Awake()
    {
        // 单例初始化
        if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);  // 可选：防止切换场景被销毁
        }
        else
        {
            Destroy(gameObject);  // 避免重复创建
        }
    }

    async void Start()
    {
        await UnityServices.InitializeAsync(); // 初始化 UGS
        var builder = ConfigurationBuilder.Instance(StandardPurchasingModule.Instance());
        builder.AddProduct(subscriptionId, ProductType.Subscription);

        UnityPurchasing.Initialize(this, builder);  // 使用新版接口
    }

    public void OnInitialized(IStoreController controller, IExtensionProvider extensions)
    {
        this.controller = controller;
        this.extensions = extensions;
        Debug.Log("IAP 初始化成功");
    }

    public void OnInitializeFailed(InitializationFailureReason error)
    {
        Debug.LogError("IAP 初始化失败: " + error);
    }

    public void OnInitializeFailed(InitializationFailureReason error, string message)
    {
        Debug.LogError($"详细失败信息: {error} - {message}");
    }

    public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs args)
    {
        if (args.purchasedProduct.definition.id == subscriptionId)
        {
            Debug.Log("订阅成功！");
            // 解锁功能
        }
        return PurchaseProcessingResult.Complete;
    }

    public void OnPurchaseFailed(Product product, PurchaseFailureDescription failureDescription)
    {
        Debug.LogError($"购买失败: {failureDescription.message}");
    }

    public void OnPurchaseFailed(Product product, PurchaseFailureReason failureReason)
    {
        Debug.LogError($"购买失败: {failureReason}");
    }

    public bool IsSubscribed()
    {
        if (controller == null)
            return false;

        Product product = controller.products.WithID(subscriptionId);
        if (product != null && product.hasReceipt)
        {
            string receipt = product.receipt;

            // 解析 JSON（第一层是 Unity 封装的 JSON）
            var receiptDict = (Dictionary<string, object>)UnityEngine.Purchasing.MiniJSON.Json.Deserialize(receipt);
            if (receiptDict.TryGetValue("Payload", out object payloadObj))
            {
#if UNITY_IOS
                // iOS 平台下，Payload 是 Apple 的 base64 收据字符串
                string base64Receipt = payloadObj.ToString();

                // 解码 base64，得到 Apple 的 JSON 收据（PKCS7 → JSON）
                // 没有服务端，这一步只能依赖 Unity IAP 自动提供的结构
                var appleReceipt = UnityEngine.Purchasing.MiniJSON.Json.Deserialize(base64Receipt) as Dictionary<string, object>;
                if (appleReceipt != null && appleReceipt.TryGetValue("latest_receipt_info", out object latestInfoObj))
                {
                    var latestList = latestInfoObj as List<object>;
                    if (latestList != null && latestList.Count > 0)
                    {
                        var latest = latestList[latestList.Count - 1] as Dictionary<string, object>;
                        if (latest != null && latest.TryGetValue("expires_date_ms", out object expiresMsObj))
                        {
                            long expiresMs = long.Parse(expiresMsObj.ToString());
                            DateTimeOffset expiresTime = DateTimeOffset.FromUnixTimeMilliseconds(expiresMs);
                            if (expiresTime > DateTimeOffset.UtcNow)
                            {
                                Debug.Log("订阅有效，过期时间：" + expiresTime);
                                return true;
                            }
                            else
                            {
                                Debug.Log("订阅已过期：" + expiresTime);
                            }
                        }
                    }
                }
#else
            Debug.LogWarning("非 iOS 平台，无法解析 iOS 订阅");
#endif
            }
        }

        Debug.Log("未订阅或订阅已过期");
        return false;
    }

    public void BuySubscription()
    {
        if (controller == null) return;

        Product product = controller.products.WithID(subscriptionId);
        if (product != null && product.availableToPurchase)
        {
            controller.InitiatePurchase(product);
        }
        else
        {
            Debug.LogWarning("订阅商品未准备好");
        }
    }

}