Reorganize AltStore project into UIKit and SwiftUI folders

AltStore/SwiftUI/Manager/NotificationManager.swift

@@ -0,0 +1,80 @@
+//
+//  NotificationManager.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 21.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+import AltStoreCore
+
+class NotificationManager: ObservableObject {
+    
+    struct Notification: Identifiable {
+        let id: UUID
+        let title: String
+        let message: String?
+    }
+    
+    static let shared = NotificationManager()
+    
+    @Published
+    var notifications: [UUID: Notification] = [:]
+    
+    private init() {}
+    
+    func reportError(error: Error) {
+        if case OperationError.cancelled = error {
+            // Ignore
+            return
+        }
+        
+        var error = error as NSError
+        var underlyingError = error.underlyingError
+        
+        if
+            let unwrappedUnderlyingError = underlyingError,
+            error.domain == AltServerErrorDomain && error.code == ALTServerError.Code.underlyingError.rawValue
+        {
+            // Treat underlyingError as the primary error.
+            
+            error = unwrappedUnderlyingError as NSError
+            underlyingError = nil
+        }
+        
+        let text: String
+        let detailText: String?
+        
+        if let failure = error.localizedFailure
+        {
+            text = failure
+            detailText = error.localizedFailureReason ?? error.localizedRecoverySuggestion ?? underlyingError?.localizedDescription ?? error.localizedDescription
+        }
+        else if let reason = error.localizedFailureReason
+        {
+            text = reason
+            detailText = error.localizedRecoverySuggestion ?? underlyingError?.localizedDescription
+        }
+        else
+        {
+            text = error.localizedDescription
+            detailText = underlyingError?.localizedDescription ?? error.localizedRecoverySuggestion
+        }
+        
+        self.showNotification(title: text, detailText: detailText)
+    }
+
+    func showNotification(title: String, detailText: String? = nil) {
+        let notificationId = UUID()
+        
+        DispatchQueue.main.async {
+            self.notifications[notificationId] = Notification(id: notificationId, title: title, message: detailText)
+        }
+        
+        let dismissWorkItem = DispatchWorkItem {
+            self.notifications.removeValue(forKey: notificationId)
+        }
+        DispatchQueue.main.asyncAfter(deadline: .now().advanced(by: .seconds(5)), execute: dismissWorkItem)
+    }
+}