import SwiftUI
import AppTrackingTransparency
import UIKit
import AppLovinSDK
import FirebaseAnalyticsSwift
import FirebaseAnalytics


class AppLovingInterstitialAdLoader: NSObject {
    var interstitialAd: MAInterstitialAd!

    //Want to have one instance of the ad for the entire app
    //We can do this b/c you will never show more than 1 ad at once so only 1 ad needs to be loaded
    static let shared = AppLovingInterstitialAdLoader()

    func loadAd() {
        self.interstitialAd = MAInterstitialAd(adUnitIdentifier: “<MAX-Ad Unit ID>”)
        self.interstitialAd.load()
    }
}



struct AppLovinInterstitialView: UIViewControllerRepresentable {

    //Here's the Ad Object we just created
    let interstitialAd: MAInterstitialAd! = AppLovingInterstitialAdLoader.shared.interstitialAd
    var retryAttempt = 0.0
    @Binding var isPresented: Bool

    init(isPresented: Binding<Bool>) {
        self._isPresented = isPresented
    }

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    //Make's a SwiftUI View from a UIViewController
    func makeUIViewController(context: Context) -> UIViewController {
        let view = UIViewController()

        //Show the ad after a slight delay to ensure the ad is loaded and ready to present
        DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(1)) {
            self.showAd(from: view)
        }

        return view
    }

    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {

    }

    //Presents the ad if it can, otherwise dismisses so the user's experience is not interrupted
    func showAd(from root: UIViewController) {

        if let ad = interstitialAd, ad.isReady {
	    // FAN_PLACEMENT_ID is in the following format “XXXXXXXXXXXXX_YYYYYYYYYYYY”
            ad.show(forPlacement: “<FAN_PLACEMENT_ID>“, customData: nil, viewController: root)
        } else {
            print("Ad not ready")
            self.isPresented.toggle()
        }
    }

    class Coordinator: NSObject, MAAdDelegate {
        var parent: AppLovinInterstitialView

        init(_ parent: AppLovinInterstitialView) {
            self.parent = parent
            super.init()
            self.parent.interstitialAd?.delegate = self
        }

        func didFailToLoadAd(forAdUnitIdentifier adUnitIdentifier: String, withError error: MAError) {
            // Interstitial ad failed to load
            // We recommend retrying with exponentially higher delays up to a maximum delay (in this case 64 seconds)

            self.parent.retryAttempt += 1
            let delaySec = pow(2.0, min(6.0, self.parent.retryAttempt))

            DispatchQueue.main.asyncAfter(deadline: .now() + delaySec) {
                AppLovingInterstitialAdLoader.shared.loadAd()
            }
            print("didFailToLoadAd")
        }

        func didDisplay(_ ad: MAAd) {
            // Pause your app's background audio
            print("Ad displayed")
        }

        func didClick(_ ad: MAAd) {
            print("Ad clicked")
        }

        func didHide(_ ad: MAAd) {
            // Resume your app's background audio
            // Interstitial ad is hidden. Pre-load the next ad
            AppLovingInterstitialAdLoader.shared.loadAd()

            // This will be the place to enable access to premium content, e.g. single lesson / flashcard deck
            print("Ad hidden")
        }

        func didFail(toDisplay ad: MAAd, withError error: MAError) {\
            // Interstitial ad failed to display. We recommend loading the next ad
            AppLovingInterstitialAdLoader.shared.loadAd()
            print("didFail")
        }

        func didLoad(_ ad: MAAd) {
            // Interstitial ad is ready to be shown. 'interstitialAd.isReady' will now return 'true'

            // Reset retry attempt
            self.parent.retryAttempt = 0
        }

    }
}