//
//  KMInAppPurchaseManager.swift
//  PDF Master
//
//  Created by lizhe on 2023/6/1.
//

import Cocoa
import StoreKit
import AuthenticationServices

class KMInAppPurchaseManager: NSObject {
    public static let manager = KMInAppPurchaseManager()
    
    var availableProducts: [SKProduct] = []
    
    override init() {
        super.init()
        // 注册购买交易观察者
        SKPaymentQueue.default().add(self)
    }
    
    func fetchProducts() {
        let productIdentifiers: Set<String> = ["com.yourapp.product1", "com.yourapp.product2"]
        let request = SKProductsRequest(productIdentifiers: productIdentifiers)
        request.delegate = self
        request.start()
    }
    
    func purchaseProduct(productIdentifier: String) {
        guard let product = availableProducts.first(where: { $0.productIdentifier == productIdentifier }) else {
            // 未找到匹配的产品
            return
        }
        
        let payment = SKPayment(product: product)
        SKPaymentQueue.default().add(payment)
    }
    
    func startInAppPurchase() {
        let productIdentifier = "your_product_identifier"
        if SKPaymentQueue.canMakePayments() {
            if let product = availableProducts.first(where: { $0.productIdentifier == productIdentifier }) {
                let payment = SKPayment(product: product)
                SKPaymentQueue.default().add(payment)
            } else {
                // 未找到匹配的产品
            }
        } else {
            // 用户无法进行内购
        }
    }
    
}

extension KMInAppPurchaseManager: SKProductsRequestDelegate {
    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        availableProducts = response.products
        // 处理产品信息
    }
    
    func request(_ request: SKRequest, didFailWithError error: Error) {
        // 处理请求错误
    }
}

extension KMInAppPurchaseManager: SKPaymentTransactionObserver {
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch transaction.transactionState {
            case .purchased:
                // 购买成功，进行本地二次验证
                validatePurchase(transaction: transaction)
            case .failed:
                // 购买失败，处理错误
                handleError(transaction: transaction)
            case .restored:
                // 恢复购买，进行本地二次验证
                validatePurchase(transaction: transaction)
            default:
                break
            }
        }
    }
        
    func validatePurchase(transaction: SKPaymentTransaction) {
        // 获取购买凭证
        if let receiptURL = Bundle.main.appStoreReceiptURL,
           let receiptData = try? Data(contentsOf: receiptURL) {
            // 进行本地二次验证
            if let parsedReceipt = parseReceipt(receiptData: receiptData),
               let purchase = parsedReceipt["in_app"] as? [[String: Any]],
               let matchingPurchase = purchase.first(where: { $0["transaction_id"] as? String == transaction.transactionIdentifier }) {
                // 验证购买凭证，进行相应的处理
                if verifyPurchase(purchase: matchingPurchase) {
                    // 购买凭证验证成功，进行购买成功的逻辑
                    SKPaymentQueue.default().finishTransaction(transaction)
                    // ...
                } else {
                    // 购买凭证验证失败，进行购买失败的逻辑
                    SKPaymentQueue.default().finishTransaction(transaction)
                    // ...
                }
            }
        }
    }
    
    func handleError(transaction: SKPaymentTransaction) {
        // 处理购买失败的逻辑
        SKPaymentQueue.default().finishTransaction(transaction)
        // ...
    }
    
    func verifyPurchase(purchase: [String: Any]) -> Bool {
        // 执行购买凭证验证的逻辑，例如验证产品标识符、购买日期等
        // 如果验证成功返回 true，否则返回 false
        // ...
        return true
    }
    
    func parseReceipt(receiptData: Data) -> [String: Any]? {
        guard let receipt = try? JSONSerialization.jsonObject(with: receiptData, options: []) as? [String: Any] else {
            return nil
        }
        
        return receipt
    }
}