popups and reapplying

Sources/EeveeSpotify/Helpers/WindowHelper.swift

@@ -0,0 +1,29 @@
+import UIKit
+import Foundation
+
+class WindowHelper {
+    
+    static let shared = WindowHelper()
+    
+    let window: UIWindow
+    let rootViewController: UIViewController
+    
+    private init() { 
+        self.window = UIApplication.shared.windows.first!
+        self.rootViewController = window.rootViewController!
+    }
+    
+    func presentViewController(_ viewController: UIViewController) {
+        rootViewController.present(viewController, animated: true)
+    }
+
+    func showPopup(message: String, buttonText: String) {
+
+        let alert = UIAlertController(title: "EeveeSpotify", message: message, preferredStyle: .alert)
+
+        alert.overrideUserInterfaceStyle = .dark
+        alert.addAction(UIAlertAction(title: buttonText, style: .default))
+
+        presentViewController(alert)
+    }
+}

Sources/EeveeSpotify/Tweak.x.swift

@@ -34,6 +34,20 @@ struct EeveeSpotify: Tweak {
             .appendingPathComponent("PersistentCache")
             .appendingPathComponent("offline.bnk")
 
+            if !FileManager.default.fileExists(atPath: filePath.path) {
+
+                DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
+
+                    WindowHelper.shared.showPopup(
+                        message: "Please log in and restart the app to get Premium.", 
+                        buttonText: "Okay!"
+                    )
+                }
+
+                NSLog("[EeveeSpotify] Not activating due to nonexistent file: \(filePath)")
+                return
+            }
+
             let fileData = try Data(contentsOf: filePath)
 
             let usernameLength = Int(fileData[8])
@@ -46,6 +60,16 @@ struct EeveeSpotify: Tweak {
 
             try blankData.write(to: filePath)
             NSLog("[EeveeSpotify] Successfully applied")
+
+            Timer.scheduledTimer(withTimeInterval: 20, repeats: true) { _ in
+                do {
+                    try blankData.write(to: filePath)
+                    NSLog("[EeveeSpotify] Successfully reapplied")
+                }
+                catch {
+                    NSLog("[EeveeSpotify] Unable to reapply (write data): \(error)")
+                }
+            }
         }
 
         catch {