//
//  CPDFOfferSubscriptionStoreView.swift
//  PDFReaderPro
//
//  Created by zenghong on 1/3/25.
//

import SwiftUI
import StoreKit

@available(iOS 18.0, macOS 15.0, tvOS 18.0, watchOS 11.0, visionOS 2.0, *)
public struct CPDFOfferSubscriptionStoreView: View {
    @State private var products: [Product] = []
    @State private var tProduct: Product?
    @State private var showLoading: Bool = true
    @State private var winBack : Product.SubscriptionOffer?
    
    var eligibleOffersCallback: (([String])->Void)?
        
    public var body: some View {
        VStack {
            if showLoading {
//                ProgressView("加载订阅信息中...")
            } else {
                //                SubscriptionStoreView(groupID: "21572797")
                SubscriptionStoreView(subscriptions: self.products).preferredSubscriptionOffer { product, subscription, eligibleOffers in
//                    print("winBackOffers：\(product.subscription?.winBackOffers)")
                    var string: [String] = []
                    for offer in eligibleOffers {
                        if let data = offer.id {
                            string.append(data)
                        }
                    }
                    eligibleOffersCallback?(string)
                    return eligibleOffers.first
                }
//                .onAppear {
//                    fetchProducts()
//                }
//                .frame(maxWidth: .infinity, maxHeight: .infinity)
            }
        }
        .onAppear {
            fetchProducts()
        }
    }
    
    public func purchaseWinBackOffer() async {
        let purchaseOption = Product.PurchaseOption.winBackOffer(winBack!)
        do {
            let purchaseResult = try await tProduct!.purchase(options: [purchaseOption])
            switch purchaseResult {
            case .success(let verificationResult):
                switch verificationResult {
                case .verified(let transaction):
                    print("购买成功：\(transaction)")
                    await transaction.finish()
                case .unverified(_, let error):
                    print("验证失败：\(error)")
                }
            case .userCancelled:
                print("用户取消了购买")
            case .pending:
                print("购买中")
            @unknown default:
                print("未知错误")
            }
        } catch {
            print("发生错误：\(error)")
        }
    }
    
    public func fetchProducts() {
        Task {
            do {
                // 加载订阅组的产品
                let identifiers = Set(["com.pdfreaderpro.mac_free.member.all_access_pack_advanced_6months.001"])
                let fetchedProducts = try await Product.products(for:identifiers)
                
                // 更新产品信息
                DispatchQueue.main.async {
                    self.products = fetchedProducts
                    self.tProduct = fetchedProducts.first
                    self.showLoading = false
                }
            } catch {
                print("无法加载产品: \(error)")
                self.showLoading = false
            }
        }
    }
}