//
//  InAppReceiptTests.swift
//  SwiftyStoreKit
//
//  Created by Andrea Bizzotto on 08/05/2017.
//  Copyright (c) 2017 Andrea Bizzotto (bizz84@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import XCTest
import SwiftyStoreKit

private extension TimeInterval {
    var millisecondsNSString: NSString {
        return String(format: "%.0f", self * 1000) as NSString
    }
}

extension ReceiptItem: Equatable {

    init(productId: String, purchaseDate: Date, subscriptionExpirationDate: Date? = nil, cancellationDate: Date? = nil, transactionId: String? = nil, isTrialPeriod: Bool = false, isInIntroOfferPeriod: Bool = false) {
        self.init(productId: productId, quantity: 1, transactionId: UUID().uuidString, originalTransactionId: UUID().uuidString, purchaseDate: purchaseDate, originalPurchaseDate: purchaseDate, webOrderLineItemId: UUID().uuidString, subscriptionExpirationDate: subscriptionExpirationDate, cancellationDate: cancellationDate, isTrialPeriod: isTrialPeriod, isInIntroOfferPeriod: isInIntroOfferPeriod)
        self.productId = productId
        self.quantity = 1
        self.purchaseDate = purchaseDate
        self.originalPurchaseDate = purchaseDate
        self.subscriptionExpirationDate = subscriptionExpirationDate
        self.cancellationDate = cancellationDate
        self.transactionId = transactionId ?? UUID().uuidString
        self.originalTransactionId = UUID().uuidString
        self.webOrderLineItemId = UUID().uuidString
        self.isTrialPeriod = isTrialPeriod
        self.isInIntroOfferPeriod = isInIntroOfferPeriod
    }

    var receiptInfo: NSDictionary {
        var result: [String: AnyObject] = [
            "product_id": productId as NSString,
            "quantity": String(quantity) as NSString,
            "purchase_date_ms": purchaseDate.timeIntervalSince1970.millisecondsNSString,
            "original_purchase_date_ms": originalPurchaseDate.timeIntervalSince1970.millisecondsNSString,
            "is_trial_period": (isTrialPeriod ? "1" : "0") as NSString,
            "transaction_id": transactionId as NSString,
            "original_transaction_id": originalTransactionId as NSString
        ]
        if let subscriptionExpirationDate = subscriptionExpirationDate {
            result["expires_date_ms"] = subscriptionExpirationDate.timeIntervalSince1970.millisecondsNSString
        }
        if let cancellationDate = cancellationDate {
            result["cancellation_date_ms"] = cancellationDate.timeIntervalSince1970.millisecondsNSString
            result["cancellation_date"] = cancellationDate as NSDate
        }
        return NSDictionary(dictionary: result)
    }
    
    public static func == (lhs: ReceiptItem, rhs: ReceiptItem) -> Bool {
        return
            lhs.productId == rhs.productId &&
            lhs.quantity == rhs.quantity &&
            lhs.purchaseDate == rhs.purchaseDate &&
            lhs.originalPurchaseDate == rhs.originalPurchaseDate &&
            lhs.subscriptionExpirationDate == rhs.subscriptionExpirationDate &&
            lhs.cancellationDate == rhs.cancellationDate &&
            lhs.isTrialPeriod == rhs.isTrialPeriod
    }
}

extension PendingRenewalInfo: Equatable {
    init(productId: String, expiryDate: Date, originalTransactionId: String) {
        self.init(autoRenewProductId: productId, autoRenewStatus: .willRenew, expirationIntent: nil, gracePeriodExpiresDate: nil, gracePeriodExpiresDateMS: expiryDate.timeIntervalSince1970.millisecondsNSString as String, gracePeriodExpiresDatePST: nil, isInBillingRetryPeriod: nil, offerCodeRefName: nil, originalTransactionId: originalTransactionId, priceConsentStatus: nil, productId: productId, promotionalOfferId: nil)
    }
    
    var receiptInfo: NSDictionary {
        var result: [String: AnyObject] = [
            "auto_renew_product_id": productId as NSString,
            "auto_renew_status": autoRenewStatus.rawValue as NSString,
            "product_id": productId as NSString,
            "original_transaction_id": originalTransactionId as NSString
        ]
        if let gracePeriodExpiresDateMS = gracePeriodExpiresDateMS {
            result["grace_period_expires_date_ms"] = gracePeriodExpiresDateMS as NSString
        }
        return NSDictionary(dictionary: result)
    }
    
    public static func == (lhs: PendingRenewalInfo, rhs: PendingRenewalInfo) -> Bool {
        return
            lhs.productId == rhs.productId &&
            lhs.autoRenewProductId == rhs.autoRenewProductId &&
            lhs.originalTransactionId == rhs.originalTransactionId &&
            lhs.gracePeriodExpiresDateMS == rhs.gracePeriodExpiresDateMS
    }
}

extension VerifySubscriptionResult: Equatable {

    public static func == (lhs: VerifySubscriptionResult, rhs: VerifySubscriptionResult) -> Bool {
        switch (lhs, rhs) {
        case (.notPurchased, .notPurchased): return true
        case (.purchased(let lhsExpiryDate, let lhsReceiptItem), .purchased(let rhsExpiryDate, let rhsReceiptItem)):
            return lhsExpiryDate == rhsExpiryDate && lhsReceiptItem == rhsReceiptItem
        case (.expired(let lhsExpiryDate, let lhsReceiptItem), .expired(let rhsExpiryDate, let rhsReceiptItem)):
            return lhsExpiryDate == rhsExpiryDate && lhsReceiptItem == rhsReceiptItem
        case (.inGracePeriod(let lhsEndDate, let lhsReceiptItem, let lhsRenewals), .inGracePeriod(let rhsEndDate, let rhsReceiptItem, let rhsRenewals)):
            return lhsEndDate == rhsEndDate && lhsReceiptItem == rhsReceiptItem && lhsRenewals == rhsRenewals
        default: return false
        }
    }
}

extension VerifyPurchaseResult: Equatable {
    
    public static func == (lhs: VerifyPurchaseResult, rhs: VerifyPurchaseResult) -> Bool {
        switch (lhs, rhs) {
        case (.notPurchased, .notPurchased): return true
        case (.purchased(let lhsReceiptItem), .purchased(let rhsReceiptItem)):
            return lhsReceiptItem == rhsReceiptItem
        default: return false
        }
    }
}

// swiftlint: disable file_length
class InAppReceiptTests: XCTestCase {

    // MARK: Verify Purchase
    func testVerifyPurchase_when_noPurchases_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let receipt = makeReceipt(items: [], requestDate: receiptRequestDate)

        let verifyPurchaseResult = SwiftyStoreKit.verifyPurchase(productId: productId, inReceipt: receipt)

        XCTAssertEqual(verifyPurchaseResult, .notPurchased)
    }
    
    func testVerifyPurchase_when_onePurchase_then_resultIsPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let item = ReceiptItem(productId: productId, purchaseDate: receiptRequestDate, subscriptionExpirationDate: nil, cancellationDate: nil, isTrialPeriod: false)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifyPurchaseResult = SwiftyStoreKit.verifyPurchase(productId: productId, inReceipt: receipt)

        XCTAssertEqual(verifyPurchaseResult, .purchased(item: item))
    }
    
    func testVerifyPurchase_when_oneCancelledPurchase_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let item = ReceiptItem(productId: productId, purchaseDate: receiptRequestDate, subscriptionExpirationDate: nil, cancellationDate: receiptRequestDate, isTrialPeriod: false)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifyPurchaseResult = SwiftyStoreKit.verifyPurchase(productId: productId, inReceipt: receipt)

        XCTAssertEqual(verifyPurchaseResult, .notPurchased)
    }

    // MARK: Verify Subscription, single receipt item tests
    // auto-renewable, not purchased
    func testVerifyAutoRenewableSubscription_when_noSubscriptions_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let receipt = makeReceipt(items: [], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.notPurchased
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // auto-renewable, expired
    func testVerifyAutoRenewableSubscription_when_oneExpiredSubscription_then_resultIsExpired() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 15)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let expirationDate = purchaseDate.addingTimeInterval(60 * 60)
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: expirationDate, cancellationDate: nil, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.expired(expiryDate: expirationDate, items: [item])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // auto-renewable, purchased
    func testVerifyAutoRenewableSubscription_when_oneNonExpiredSubscription_then_resultIsPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = receiptRequestDate
        let expirationDate = purchaseDate.addingTimeInterval(60 * 60)
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: expirationDate, cancellationDate: nil, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.purchased(expiryDate: expirationDate, items: [item])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // auto-renewable, cancelled
    func testVerifyAutoRenewableSubscription_when_oneCancelledSubscription_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = receiptRequestDate
        let expirationDate = purchaseDate.addingTimeInterval(60 * 60)
        let cancelledDate = purchaseDate.addingTimeInterval(30 * 60)
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: expirationDate, cancellationDate: cancelledDate, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.notPurchased
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }
    
    // auto-renewable, in grace period
    func testVerifyAutoRenewableSubscription_when_oneGracePeriodSubscription_then_resultIsPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 15)
        let productId = "product1"
        let purchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let expirationDate = purchaseDate.addingTimeInterval(60 * 60)
        let transactionId = UUID().uuidString
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: expirationDate, cancellationDate: nil, transactionId: transactionId, isTrialPeriod: false)
        
        let gracePeriodExpirationDate = makeDateAtMidnight(year: 2017, month: 5, day: 16)
        let pendingRenewal = PendingRenewalInfo(productId: productId, expiryDate: gracePeriodExpirationDate, originalTransactionId: transactionId)
        
        let receiptNormal = makeReceipt(items: [item], requestDate: receiptRequestDate)
        let verifySubscriptionResultNormal = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receiptNormal)
        let expectedSubscriptionResultNormal = VerifySubscriptionResult.expired(expiryDate: expirationDate, items: [item])
        //Sanity Check: Without the pending renewal info the receipt should have been expired.
        XCTAssertEqual(verifySubscriptionResultNormal, expectedSubscriptionResultNormal)
        
        let receiptWithPendingRenewal = makeReceipt(items: [item], requestDate: receiptRequestDate, pendingRenewals: [pendingRenewal])
        let verifySubscriptionResultWithPendingRenewal = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receiptWithPendingRenewal)
        let expectedSubscriptionResultWithPendingRenewal = VerifySubscriptionResult.inGracePeriod(endDate: gracePeriodExpirationDate, items: [item], pendingRenewals: [pendingRenewal])
        //With the pending renewal info, we're in a grace period
        XCTAssertEqual(verifySubscriptionResultWithPendingRenewal, expectedSubscriptionResultWithPendingRenewal)
    }
    
    // auto-renewable, in expired grace period
    func testVerifyAutoRenewableSubscription_when_oneExpiredGracePeriodSubscription_then_resultIsExpired() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 20)
        let productId = "product1"
        let purchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let expirationDate = purchaseDate.addingTimeInterval(60 * 60)
        let transactionId = UUID().uuidString
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: expirationDate, cancellationDate: nil, transactionId: transactionId, isTrialPeriod: false)
        
        let gracePeriodExpirationDate = makeDateAtMidnight(year: 2017, month: 5, day: 19)
        let pendingRenewal = PendingRenewalInfo(productId: productId, expiryDate: gracePeriodExpirationDate, originalTransactionId: transactionId)
        
        let receiptNormal = makeReceipt(items: [item], requestDate: receiptRequestDate)
        let verifySubscriptionResultNormal = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receiptNormal)
        let expectedSubscriptionResultNormal = VerifySubscriptionResult.expired(expiryDate: expirationDate, items: [item])
        //Sanity Check: Without the pending renewal info the receipt should have been expired.
        XCTAssertEqual(verifySubscriptionResultNormal, expectedSubscriptionResultNormal)
        
        let receiptWithPendingRenewal = makeReceipt(items: [item], requestDate: receiptRequestDate, pendingRenewals: [pendingRenewal])
        let verifySubscriptionResultWithPendingRenewal = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receiptWithPendingRenewal)
        let expectedSubscriptionResultWithPendingRenewal = VerifySubscriptionResult.expired(expiryDate: expirationDate, items: [item])
        //With the pending renewal info, we're still in the expired state as the pending renewal info has expired as well
        XCTAssertEqual(verifySubscriptionResultWithPendingRenewal, expectedSubscriptionResultWithPendingRenewal)
    }

    // non-renewing, non purchased
    func testVerifyNonRenewingSubscription_when_noSubscriptions_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let receipt = makeReceipt(items: [], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .nonRenewing(validDuration: 60 * 60), productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.notPurchased
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // non-renewing, expired
    func testVerifyNonRenewingSubscription_when_oneExpiredSubscription_then_resultIsExpired() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 15)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let duration: TimeInterval = 60 * 60
        let expirationDate = purchaseDate.addingTimeInterval(duration)

        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: nil, cancellationDate: nil, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .nonRenewing(validDuration: duration), productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.expired(expiryDate: expirationDate, items: [item])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // non-renewing, purchased
    func testVerifyNonRenewingSubscription_when_oneNonExpiredSubscription_then_resultIsPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = receiptRequestDate
        let duration: TimeInterval = 60 * 60
        let expirationDate = purchaseDate.addingTimeInterval(duration)

        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: nil, cancellationDate: nil, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .nonRenewing(validDuration: duration), productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.purchased(expiryDate: expirationDate, items: [item])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // non-renewing, cancelled
    func testVerifyNonRenewingSubscription_when_oneCancelledSubscription_then_resultIsNotPurchased() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let productId = "product1"
        let isTrialPeriod = false
        let purchaseDate = receiptRequestDate
        let duration: TimeInterval = 60 * 60
        let cancelledDate = purchaseDate.addingTimeInterval(30 * 60)
        let item = ReceiptItem(productId: productId, purchaseDate: purchaseDate, subscriptionExpirationDate: nil, cancellationDate: cancelledDate, isTrialPeriod: isTrialPeriod)
        let receipt = makeReceipt(items: [item], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .nonRenewing(validDuration: duration), productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.notPurchased
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    // MARK: Verify Subscription, multiple receipt item tests
    func testVerifyAutoRenewableSubscription_when_twoSubscriptions_sameProductId_mostRecentNonExpired_then_resultIsPurchased_itemsSorted() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)

        let productId = "product1"
        let isTrialPeriod = false

        let olderPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 12)
        let olderExpirationDate = olderPurchaseDate.addingTimeInterval(60 * 60)
        let olderItem = ReceiptItem(productId: productId,
                               purchaseDate: olderPurchaseDate,
                               subscriptionExpirationDate: olderExpirationDate,
                               cancellationDate: nil,
                               isTrialPeriod: isTrialPeriod)

        let newerPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let newerExpirationDate = newerPurchaseDate.addingTimeInterval(60 * 60)
        let newerItem = ReceiptItem(productId: productId,
                                    purchaseDate: newerPurchaseDate,
                                    subscriptionExpirationDate: newerExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)

        let receipt = makeReceipt(items: [olderItem, newerItem], requestDate: receiptRequestDate)

        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)

        let expectedSubscriptionResult = VerifySubscriptionResult.purchased(expiryDate: newerExpirationDate, items: [newerItem, olderItem])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }

    func testVerifyAutoRenewableSubscription_when_twoSubscriptions_sameProductId_bothExpired_then_resultIsExpired_itemsSorted() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        
        let productId = "product1"
        let isTrialPeriod = false
        
        let olderPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 12)
        let olderExpirationDate = olderPurchaseDate.addingTimeInterval(60 * 60)
        let olderItem = ReceiptItem(productId: productId,
                                    purchaseDate: olderPurchaseDate,
                                    subscriptionExpirationDate: olderExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)
        
        let newerPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 13)
        let newerExpirationDate = newerPurchaseDate.addingTimeInterval(60 * 60)
        let newerItem = ReceiptItem(productId: productId,
                                    purchaseDate: newerPurchaseDate,
                                    subscriptionExpirationDate: newerExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)
        
        let receipt = makeReceipt(items: [olderItem, newerItem], requestDate: receiptRequestDate)
        
        let verifySubscriptionResult = SwiftyStoreKit.verifySubscription(ofType: .autoRenewable, productId: productId, inReceipt: receipt)
        
        let expectedSubscriptionResult = VerifySubscriptionResult.expired(expiryDate: newerExpirationDate, items: [newerItem, olderItem])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }
    
    // MARK: Verify Subscriptions, multiple receipt item tests
    func testVerifyAutoRenewableSubscriptions_when_threeSubscriptions_twoMatchingProductIds_mostRecentNonExpired_then_resultIsPurchased_itemsSorted() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        
        let productId1 = "product1"
        let productId2 = "product2"
        let productIds = Set([ productId1, productId2 ])
        let isTrialPeriod = false
        
        let olderPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 12)
        let olderExpirationDate = olderPurchaseDate.addingTimeInterval(60 * 60)
        let olderItem = ReceiptItem(productId: productId1,
                                    purchaseDate: olderPurchaseDate,
                                    subscriptionExpirationDate: olderExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)
        
        let newerPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let newerExpirationDate = newerPurchaseDate.addingTimeInterval(60 * 60)
        let newerItem = ReceiptItem(productId: productId2,
                                    purchaseDate: newerPurchaseDate,
                                    subscriptionExpirationDate: newerExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)
        
        let otherPurchaseDate = makeDateAtMidnight(year: 2017, month: 5, day: 15)
        let otherExpirationDate = otherPurchaseDate.addingTimeInterval(60 * 60)
        let otherItem = ReceiptItem(productId: "otherProduct",
                                    purchaseDate: otherPurchaseDate,
                                    subscriptionExpirationDate: otherExpirationDate,
                                    cancellationDate: nil,
                                    isTrialPeriod: isTrialPeriod)
        
        let receipt = makeReceipt(items: [olderItem, newerItem, otherItem], requestDate: receiptRequestDate)
        
        let verifySubscriptionResult = SwiftyStoreKit.verifySubscriptions(ofType: .autoRenewable, productIds: productIds, inReceipt: receipt)
        
        let expectedSubscriptionResult = VerifySubscriptionResult.purchased(expiryDate: newerExpirationDate, items: [newerItem, olderItem])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
    }
    
    func testVerifyAutoRenewableSubscriptions_when_threeSubscriptions_oneInGracePeriodExpired_twoInGracePeriod_then_resultIsPurchased_itemsSorted() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 20)
        
        let productId1 = "product1"
        let productId2 = "product2"
        let productId3 = "product3"
        let productIds = Set([ productId1, productId2, productId3 ])
        let isTrialPeriod = false
        
        let id1 = UUID().uuidString
        let id2 = UUID().uuidString
        let id3 = UUID().uuidString
        
        let purchaseDate1 = makeDateAtMidnight(year: 2017, month: 5, day: 10)
        let expirationDate1 = purchaseDate1.addingTimeInterval(60 * 60)
        let item1 = ReceiptItem(productId: productId1,
                                    purchaseDate: purchaseDate1,
                                    subscriptionExpirationDate: expirationDate1,
                                    transactionId: id1,
                                    isTrialPeriod: isTrialPeriod)
        
        let purchaseDate2 = makeDateAtMidnight(year: 2017, month: 5, day: 11)
        let expirationDate2 = purchaseDate2.addingTimeInterval(60 * 60)
        let item2 = ReceiptItem(productId: productId2,
                                    purchaseDate: purchaseDate2,
                                    subscriptionExpirationDate: expirationDate2,
                                    transactionId: id2,
                                    isTrialPeriod: isTrialPeriod)
        
        let purchaseDate3 = makeDateAtMidnight(year: 2017, month: 5, day: 12)
        let expirationDate3 = purchaseDate3.addingTimeInterval(60 * 60)
        let item3 = ReceiptItem(productId: productId3,
                                    purchaseDate: purchaseDate3,
                                    subscriptionExpirationDate: expirationDate3,
                                    transactionId: id3,
                                    isTrialPeriod: isTrialPeriod)
        
        //Sanity Check: Without pending renewals the result should be expired, and items ordered descending
        let receipt = makeReceipt(items: [item1, item2, item3], requestDate: receiptRequestDate)
        let verifySubscriptionResult = SwiftyStoreKit.verifySubscriptions(ofType: .autoRenewable, productIds: productIds, inReceipt: receipt)
        let expectedSubscriptionResult = VerifySubscriptionResult.expired(expiryDate: expirationDate3, items: [item3, item2, item1])
        XCTAssertEqual(verifySubscriptionResult, expectedSubscriptionResult)
        
        let renewalDate1 = makeDateAtMidnight(year: 2017, month: 5, day: 19)
        let renewalDate2 = makeDateAtMidnight(year: 2017, month: 5, day: 21)
        let renewalDate3 = makeDateAtMidnight(year: 2017, month: 5, day: 22)
        
        let renewal1 = PendingRenewalInfo(productId: productId1, expiryDate: renewalDate1, originalTransactionId: id1)
        let renewal2 = PendingRenewalInfo(productId: productId2, expiryDate: renewalDate2, originalTransactionId: id2)
        let renewal3 = PendingRenewalInfo(productId: productId3, expiryDate: renewalDate3, originalTransactionId: id3)
        
        //With pending renewals here, renewal1 and thus item 2 should be expired and not returned.
        //But the result should be `.inGracePeriod` with the items/renewals in descending order.
        let receiptWithRenewables = makeReceipt(items: [item1, item2, item3], requestDate: receiptRequestDate, pendingRenewals: [renewal1, renewal2, renewal3])
        let verifySubscriptionResultRenewables = SwiftyStoreKit.verifySubscriptions(ofType: .autoRenewable, productIds: productIds, inReceipt: receiptWithRenewables)
        let expectedSubscriptionResultRenewables = VerifySubscriptionResult.inGracePeriod(endDate: renewalDate3, items: [item3, item2], pendingRenewals: [renewal3, renewal2])
        XCTAssertEqual(verifySubscriptionResultRenewables, expectedSubscriptionResultRenewables)
    }
    
    // MARK: Get Distinct Purchase Identifiers, empty receipt item tests
    func testGetDistinctPurchaseIds_when_noReceipt_then_resultIsNil() {
        let receiptRequestDate = makeDateAtMidnight(year: 2017, month: 5, day: 14)
        let receipt = makeReceipt(items: [], requestDate: receiptRequestDate)

        let getdistinctProductIdsResult = SwiftyStoreKit.getDistinctPurchaseIds(ofType: .autoRenewable, inReceipt: receipt)
        XCTAssertNil(getdistinctProductIdsResult)
    }
    
    // MARK: Get Distinct Purchase Identifiers, multiple receipt item tests
    func testGetDistinctPurchaseIds_when_Receipt_then_resultIsNotNil() {
        let receiptRequestDateOne = makeDateAtMidnight(year: 2020, month: 2, day: 20)
        let purchaseDateOne = makeDateAtMidnight(year: 2020, month: 2, day: 1)
        let purchaseDateTwo = makeDateAtMidnight(year: 2020, month: 1, day: 1)
        
        let productId1 = "product1"
        let productId2 = "product2"
        
        let product1 = ReceiptItem(productId: productId1, purchaseDate: purchaseDateOne)
        let product2 = ReceiptItem(productId: productId2, purchaseDate: purchaseDateTwo)
        
        let receipt = makeReceipt(items: [product1, product2], requestDate: receiptRequestDateOne)

        let getdistinctProductIdsResult = SwiftyStoreKit.getDistinctPurchaseIds(ofType: .autoRenewable, inReceipt: receipt)
                
        XCTAssertNotNil(getdistinctProductIdsResult)
    }
    
    // MARK: Get Distinct Purchase Identifiers, multiple non unique product identifiers tests
    func testGetDistinctPurchaseIds_when_nonUniqueIdentifiers_then_resultIsUnique() {
        let receiptRequestDateOne = makeDateAtMidnight(year: 2020, month: 2, day: 20)
        let purchaseDateOne = makeDateAtMidnight(year: 2020, month: 2, day: 1)
        let purchaseDateTwo = makeDateAtMidnight(year: 2020, month: 2, day: 2)
        let purchaseDateThree = makeDateAtMidnight(year: 2020, month: 2, day: 3)
        let purchaseDateFour = makeDateAtMidnight(year: 2020, month: 2, day: 4)

        let productId1 = "product1"
        let productId2 = "product2"
        let productId3 = "product1"
        let productId4 = "product2"

        let product1 = ReceiptItem(productId: productId1, purchaseDate: purchaseDateOne)
        let product2 = ReceiptItem(productId: productId2, purchaseDate: purchaseDateTwo)
        let product3 = ReceiptItem(productId: productId3, purchaseDate: purchaseDateThree)
        let product4 = ReceiptItem(productId: productId4, purchaseDate: purchaseDateFour)

        let receipt = makeReceipt(items: [product1, product2, product3, product4], requestDate: receiptRequestDateOne)

        let getdistinctProductIdsResult = SwiftyStoreKit.getDistinctPurchaseIds(ofType: .autoRenewable, inReceipt: receipt)
        let expectedProductIdsResult = Set([productId1, productId2, productId3, productId4])
        XCTAssertEqual(getdistinctProductIdsResult, expectedProductIdsResult)
    }

    // MARK: Helper methods
    func makeReceipt(items: [ReceiptItem], requestDate: Date, pendingRenewals: [PendingRenewalInfo] = []) -> [String: AnyObject] {
        let receiptInfos = items.map { $0.receiptInfo }
        let renewalReceiptInfos = pendingRenewals.map { $0.receiptInfo }

        // Creating this with NSArray results in __NSSingleObjectArrayI which fails the cast to [String: AnyObject]
        let array = NSMutableArray()
        array.addObjects(from: receiptInfos)
        
        let arrayRenewables = NSMutableArray()
        arrayRenewables.addObjects(from: renewalReceiptInfos)

        return [
            "status": "200" as NSString,
            "environment": "Sandbox" as NSString,
            "receipt": NSDictionary(dictionary: [
                "request_date_ms": requestDate.timeIntervalSince1970.millisecondsNSString,
                "in_app": array // non renewing
            ]),
            "latest_receipt_info": array, // autoRenewable
            PendingRenewalInfo.KEY_IN_RESPONSE_BODY: arrayRenewables //autoRenewable in case of grace period active
        ]
    }

    func makeDateAtMidnight(year: Int, month: Int, day: Int) -> Date {
        var dateComponents = DateComponents()
        dateComponents.day = day
        dateComponents.month = month
        dateComponents.year = year
        let calendar = Calendar(identifier: .gregorian)
        return calendar.date(from: dateComponents)!
    }
}