//
//  PaymentHandler.swift
//  PSCB-OOS-iOS
//
//  Created by Antonov Ilia on 16.10.2020.
//

import Foundation
import PassKit

public typealias PaymentCompletionHandler = (Bool) -> Void

public class ApplePayHandler: NSObject {
    
    static let supportedNetworks: [PKPaymentNetwork] = [.visa, .masterCard]
    
    // MARK: - Fields
    
    public let merchantId: String
    public let merchantKey: String
    public let summaryItems: [PKPaymentSummaryItem]
    
    // MARK: - Properties
    
    var paymentController: PKPaymentAuthorizationController?
    var paymentStatus: PKPaymentAuthorizationStatus = .failure
    var completionHandler: PaymentCompletionHandler?
    var payment: Payment?
    
    public init?(merchantId: String, merchantKey: String, summaryItems: [PKPaymentSummaryItem]) {
        guard PKPaymentAuthorizationController.canMakePayments(usingNetworks: Self.supportedNetworks) else {
            print("Could not instantiate ApplePayHandler. Cannot make payments with provided networks")
            return nil
        }
        
        self.merchantId = merchantId
        self.merchantKey = merchantKey
        self.summaryItems = summaryItems
    }
    
    public func handle(payment: Payment, completion: @escaping PaymentCompletionHandler) {
        self.completionHandler = completion
        self.payment = payment
        
        NSLog("About to handle payment: \(payment)")
        
        paymentController = PKPaymentAuthorizationController(paymentRequest: paymentRequest)
        paymentController?.delegate = self
        paymentController?.present { (presented) in
            if !presented {
                NSLog("Could not present PKPaymentAuthorizationController")
                self.completionHandler!(false)
            } else {
                NSLog("PKPaymentAuthorizationController presented")
            }
        }
        
    }
    
    // MARK: - Private details
    
    private var paymentRequest: PKPaymentRequest {
        let request = PKPaymentRequest()
        
        request.countryCode = "RU"
        request.merchantIdentifier = "merchant.pscb.pay"
        request.currencyCode = "RUB"
        request.supportedNetworks = Self.supportedNetworks
        request.merchantCapabilities = .capability3DS
        request.paymentSummaryItems = summaryItems
        
        return request
    }
    
}


// MARK: - Extension for PKPaymentAuthorizationControllerDelegate

extension ApplePayHandler: PKPaymentAuthorizationControllerDelegate {
    
    public func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController,
                                        didAuthorizePayment payment: PKPayment,
                                        completion: @escaping (PKPaymentAuthorizationStatus) -> Void) {
        
//        print("Payment string")
//        let paymentString = try! payment.serializeToString()
//        print(paymentString)
//
//        //
//
//        self.paymentStatus = .success
        completion(PKPaymentAuthorizationStatus.success)
    }
    
    @available(iOS 11.0, *)
    public func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
//        
//        NSLog("About to send request to backend")
//        let paymentString = try! payment.serializeToString()
//        
//        NSLog("Payment JSON: \(paymentString)")
//        
        let result = PKPaymentAuthorizationResult(status: .success, errors: nil)
        completion(result)
        self.completionHandler?(true)
    }
   
    public func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
        controller.dismiss(completion: nil)
    }
    
}