//
// CompleteTransactionsControllerTests.swift
// SwiftyStoreKit
//
// 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 StoreKit
@testable import SwiftyStoreKit

class CompleteTransactionsControllerTests: XCTestCase {

    func testProcessTransactions_when_oneRestoredTransaction_then_finishesTransaction_callsCallback_noRemainingTransactions() {

        let productIdentifier = "com.SwiftyStoreKit.product1"
        let testProduct = TestProduct(productIdentifier: productIdentifier)

        let transaction = TestPaymentTransaction(payment: SKPayment(product: testProduct), transactionState: .restored)

        var callbackCalled = false
        let completeTransactions = CompleteTransactions(atomically: true) { purchases in
            callbackCalled = true
            XCTAssertEqual(purchases.count, 1)
            let purchase = purchases.first!
            XCTAssertEqual(purchase.productId, productIdentifier)
        }

        let completeTransactionsController = makeCompleteTransactionsController(completeTransactions: completeTransactions)

        let spy = PaymentQueueSpy()

        let remainingTransactions = completeTransactionsController.processTransactions([transaction], on: spy)

        XCTAssertEqual(remainingTransactions.count, 0)

        XCTAssertTrue(callbackCalled)

        XCTAssertEqual(spy.finishTransactionCalledCount, 1)
    }

    func testProcessTransactions_when_oneTransactionForEachState_then_finishesTransactions_callsCallback_onePurchasingTransactionRemaining() {

        let transactions = [
            makeTestPaymentTransaction(productIdentifier: "com.SwiftyStoreKit.product1", transactionState: .purchased),
            makeTestPaymentTransaction(productIdentifier: "com.SwiftyStoreKit.product2", transactionState: .failed),
            makeTestPaymentTransaction(productIdentifier: "com.SwiftyStoreKit.product3", transactionState: .restored),
            makeTestPaymentTransaction(productIdentifier: "com.SwiftyStoreKit.product4", transactionState: .deferred),
            makeTestPaymentTransaction(productIdentifier: "com.SwiftyStoreKit.product5", transactionState: .purchasing)
        ]

        var callbackCalled = false
        let completeTransactions = CompleteTransactions(atomically: true) { purchases in
            callbackCalled = true
            XCTAssertEqual(purchases.count, 4)

            for i in 0..<4 {
                XCTAssertEqual(purchases[i].productId, transactions[i].payment.productIdentifier)
            }
        }

        let completeTransactionsController = makeCompleteTransactionsController(completeTransactions: completeTransactions)

        let spy = PaymentQueueSpy()

        let remainingTransactions = completeTransactionsController.processTransactions(transactions, on: spy)

        XCTAssertEqual(remainingTransactions.count, 1)

        XCTAssertTrue(callbackCalled)

        XCTAssertEqual(spy.finishTransactionCalledCount, 4)
    }

    func testProcessTransactions_when_zeroTransactions_then_noFinishedTransactions_noCallback_noTransactionsRemaining() {

        let transactions: [TestPaymentTransaction] = []

        let completeTransactions = CompleteTransactions(atomically: true) { _ in
            XCTFail("Callback should not be called")
        }

        let completeTransactionsController = makeCompleteTransactionsController(completeTransactions: completeTransactions)

        let spy = PaymentQueueSpy()

        let remainingTransactions = completeTransactionsController.processTransactions(transactions, on: spy)

        XCTAssertEqual(remainingTransactions.count, 0)

        XCTAssertEqual(spy.finishTransactionCalledCount, 0)
    }

    func testProcessTransactions_when_onePurchasingTransaction_then_noFinishedTransactions_noCallback_oneTransactionsRemaining() {

        let productIdentifier = "com.SwiftyStoreKit.product1"
        let testProduct = TestProduct(productIdentifier: productIdentifier)

        let transaction = TestPaymentTransaction(payment: SKPayment(product: testProduct), transactionState: .purchasing)

        let completeTransactions = CompleteTransactions(atomically: true) { _ in
            XCTFail("Callback should not be called")
        }

        let completeTransactionsController = makeCompleteTransactionsController(completeTransactions: completeTransactions)

        let spy = PaymentQueueSpy()

        let remainingTransactions = completeTransactionsController.processTransactions([transaction], on: spy)

        XCTAssertEqual(remainingTransactions.count, 1)

        XCTAssertEqual(spy.finishTransactionCalledCount, 0)
    }

    func makeTestPaymentTransaction(productIdentifier: String, transactionState: SKPaymentTransactionState) -> TestPaymentTransaction {

        let testProduct = TestProduct(productIdentifier: productIdentifier)
        return TestPaymentTransaction(payment: SKPayment(product: testProduct), transactionState: transactionState)
    }

    func makeCompleteTransactionsController(completeTransactions: CompleteTransactions?) -> CompleteTransactionsController {

        let completeTransactionsController = CompleteTransactionsController()

        completeTransactionsController.completeTransactions = completeTransactions

        return completeTransactionsController
    }

}