Jetpack Focus: Show Jetpack app installation within the app using Sto…

…reKit (#21896)

WordPress/Classes/ViewRelated/Jetpack/Branding/Coordinator/JetpackRedirector.swift

@@ -1,4 +1,5 @@
 import Foundation
+import StoreKit
 
 class JetpackRedirector {
 
@@ -30,8 +31,63 @@ class JetpackRedirector {
 
         // First, check if the WordPress app can open Jetpack by testing its URL scheme.
         // if we can potentially open Jetpack app, let's open it through universal link to avoid scheme conflicts (e.g., a certain game :-).
-        // finally, if the user might not have Jetpack installed, direct them to App Store page.
-        let urlToOpen = UIApplication.shared.canOpenURL(jetpackDeepLinkURL) ? jetpackUniversalLinkURL : jetpackAppStoreURL
-        UIApplication.shared.open(urlToOpen)
+        // finally, if the user might not have Jetpack installed, open App Store view controller through StoreKit.
+        if UIApplication.shared.canOpenURL(jetpackDeepLinkURL) {
+            UIApplication.shared.open(jetpackUniversalLinkURL)
+        } else {
+            showJetpackAppInstallation(fallbackURL: jetpackAppStoreURL)
+        }
+    }
+
+    private static func showJetpackAppInstallation(fallbackURL: URL) {
+        let viewController = RootViewCoordinator.sharedPresenter.rootViewController.topmostPresentedViewController
+        let storeProductVC = SKStoreProductViewController()
+        let appID = [SKStoreProductParameterITunesItemIdentifier: "1565481562"]
+
+        configureNavigationBarAppearance(storeProductVC)
+
+        storeProductVC.loadProduct(withParameters: appID) { (result, error) in
+            if result {
+                viewController.present(storeProductVC, animated: true)
+            } else if let error = error {
+                DDLogError("Failed loading Jetpack App product: \(error.localizedDescription)")
+                UIApplication.shared.open(fallbackURL)
+            }
+        }
     }
+
+    // MARK: - SKStoreProductViewController navigation bar appearance
+
+    /// Sets SKStoreProductViewController navigation bar translucent
+    ///
+    /// Application's global navigation appearance settings interferes with SKStoreProductViewController
+    /// which requires for this temporary workaround
+    private static func configureNavigationBarAppearance(_ controller: SKStoreProductViewController) {
+        let previousisTranslucentValue = UINavigationBar.appearance().isTranslucent
+        UINavigationBar.appearance().isTranslucent = true
+
+        /// Reset to default translucent value
+        storeProductViewControllerObserver = StoreProductViewControllerObserver(onDismiss: {
+            UINavigationBar.appearance().isTranslucent = previousisTranslucentValue
+            storeProductViewControllerObserver = nil
+        })
+
+        controller.delegate = storeProductViewControllerObserver
+    }
+
+    /// Observe product view controller dismissal
+    class StoreProductViewControllerObserver: NSObject, SKStoreProductViewControllerDelegate {
+        private let onDismiss: () -> ()
+
+        init(onDismiss: @escaping () -> ()) {
+            self.onDismiss = onDismiss
+            super.init()
+        }
+
+        func productViewControllerDidFinish(_ viewController: SKStoreProductViewController) {
+            onDismiss()
+        }
+    }
+
+    private static var storeProductViewControllerObserver: StoreProductViewControllerObserver?
 }