EllinaKuznetcova

//
//  InAppManager.swift
//
//  Created by Ellina Kuznetcova on 12/10/2016.
//  Copyright © 2016 Flatstack. All rights reserved.
//

import Foundation
import StoreKit

EllinaKuznetcova

extension InAppManager: SKPaymentTransactionObserver {
    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            guard let productType = ProductType(rawValue: transaction.payment.productIdentifier) else {fatalError()}
            switch transaction.transactionState {
            case .purchasing:
            case .purchased:
            case .failed:
            case .restored:
            case .deferred:

EllinaKuznetcova

protocol InAppManagerDelegate: class {
    func inAppLoadingStarted()
    func inAppLoadingSucceded(productType: ProductType)
    func inAppLoadingFailed(error: Swift.Error?)
    func subscriptionStatusUpdated(value: Bool)
}

EllinaKuznetcova

enum InAppErrors: Swift.Error {
    case noSubscriptionPurchased
    case noProductsAvailable
    
    var localizedDescription: String {
        switch self {
        case .noSubscriptionPurchased:
            return "No subscription purchased"
        case .noProductsAvailable:
            return "No products available"

EllinaKuznetcova

var isSubscriptionAvailable: Bool = true
        {
        didSet(value) {
            self.delegate?.subscriptionStatusUpdated(value: value)
        }
    }

EllinaKuznetcova

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            guard let productType = ProductType(rawValue: transaction.payment.productIdentifier) else {fatalError()}
            switch transaction.transactionState {
            case .purchasing:
                self.delegate?.inAppLoadingStarted()
            case .purchased:
                SKPaymentQueue.default().finishTransaction(transaction)
                self.updateSubscriptionStatus()
                self.isSubscriptionAvailable = true

EllinaKuznetcova

class InAppManager: NSObject {    
    static let shared = InAppManager()
}
extension InAppManager: SKPaymentTransactionObserver {}
extension InAppManager: SKProductsRequestDelegate {}

EllinaKuznetcova

enum ProductType: String {    
    case weekly = "com.example.app.weekly"    
    case monthly = "com.example.app.monthly"    
    case yearly = "com.example.app.yearly"        
   
    static var all: [ProductType] {        
        return [.weekly, .monthly, .yearly]    
    }
}

EllinaKuznetcova

func loadProducts() { 
    let productIdentifiers = Set<String>(ProductType.all.map({$0.rawValue})) 
    let request = SKProductsRequest(productIdentifiers: productIdentifiers) 
    request.delegate = self 
    request.start() 
}

EllinaKuznetcova

extension InAppManager: SKProductsRequestDelegate { 
    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        self.products = response.products 
    }
}