//
//  InAppPurchaseInteractor.swift
//  MullvadVPN
//
//  Created by Mojgan on 2023-07-21.
//  Copyright © 2025 Mullvad VPN AB. All rights reserved.
//

import Foundation
import StoreKit

protocol InAppPurchaseViewControllerDelegate: AnyObject {
    func didBeginPayment()
    func didEndPayment()
}

class InAppPurchaseInteractor: @unchecked Sendable {
    let storePaymentManager: StorePaymentManager
    var didFinishPayment: ((InAppPurchaseInteractor, StorePaymentEvent) -> Void)?
    weak var viewControllerDelegate: InAppPurchaseViewControllerDelegate?

    private var paymentObserver: StorePaymentObserver?

    init(storePaymentManager: StorePaymentManager) {
        self.storePaymentManager = storePaymentManager
        self.addObservers()
    }

    private func addObservers() {
        let paymentObserver = StorePaymentBlockObserver { [weak self] _, event in
            guard let self else { return }
            viewControllerDelegate?.didEndPayment()
            didFinishPayment?(self, event)
        }

        storePaymentManager.addPaymentObserver(paymentObserver)

        self.paymentObserver = paymentObserver
    }

    func purchase(accountNumber: String, product: SKProduct) {
        let payment = SKPayment(product: product)
        storePaymentManager.addPayment(payment, for: accountNumber)
        viewControllerDelegate?.didBeginPayment()
    }
}