[AltStore] Update apps from UpdatesViewController

AltStore/Updates/UpdatesViewController.swift

@@ -21,19 +21,36 @@ class UpdatesViewController: UITableViewController
         return dateFormatter
     }()
     
+    @IBOutlet private var progressView: UIProgressView!
+    
+    required init?(coder aDecoder: NSCoder)
+    {
+        super.init(coder: aDecoder)
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(UpdatesViewController.didFetchApps(_:)), name: AppManager.didFetchAppsNotification, object: nil)
+    }
+    
     override func viewDidLoad()
     {
         super.viewDidLoad()
         
         self.tableView.dataSource = self.dataSource
+        
+        if let navigationBar = self.navigationController?.navigationBar
+        {
+            self.progressView.translatesAutoresizingMaskIntoConstraints = false
+            navigationBar.addSubview(self.progressView)
+            
+            NSLayoutConstraint.activate([self.progressView.widthAnchor.constraint(equalTo: navigationBar.widthAnchor),
+                                         self.progressView.bottomAnchor.constraint(equalTo: navigationBar.bottomAnchor)])
+        }
     }
     
     override func viewDidAppear(_ animated: Bool)
     {
         super.viewDidAppear(animated)
         
-        let count = self.tableView.numberOfRows(inSection: 0)
-        self.navigationController?.tabBarItem.badgeValue = count > 0 ? String(describing: count) : nil
+        self.update()
     }
     
     override func prepare(for segue: UIStoryboardSegue, sender: Any?)
@@ -71,6 +88,98 @@ private extension UpdatesViewController
             cell.detailTextLabel?.text = detailText
         }
         
+        let placeholderView = RSTPlaceholderView()
+        placeholderView.textLabel.text = NSLocalizedString("No Updates", comment: "")
+        placeholderView.detailTextLabel.text = NSLocalizedString("There are no app updates at this time.", comment: "")
+        dataSource.placeholderView = placeholderView
+        
         return dataSource
     }
+    
+    func update()
+    {
+        if let count = self.dataSource.fetchedResultsController.fetchedObjects?.count, count > 0
+        {
+            self.navigationController?.tabBarItem.badgeValue = String(describing: count)
+        }
+        else
+        {
+            self.navigationController?.tabBarItem.badgeValue = nil
+        }
+    }
+}
+
+private extension UpdatesViewController
+{
+    func update(_ installedApp: InstalledApp)
+    {
+        let toastView = RSTToastView(text: "Updating...", detailText: nil)
+        toastView.tintColor = .altPurple
+        toastView.activityIndicatorView.startAnimating()
+        toastView.show(in: self.navigationController?.view ?? self.view)
+        
+        let progress = AppManager.shared.install(installedApp.app, presentingViewController: self) { (result) in
+            do
+            {
+                let app = try result.get()
+                try app.managedObjectContext?.save()
+                
+                DispatchQueue.main.async {
+                    let installedApp = DatabaseManager.shared.persistentContainer.viewContext.object(with: installedApp.objectID) as! InstalledApp
+                    
+                    let toastView = RSTToastView(text: "Updated \(installedApp.app.name) to version \(installedApp.version)!", detailText: nil)
+                    toastView.tintColor = .altPurple
+                    toastView.show(in: self.navigationController?.view ?? self.view, duration: 2)
+                    
+                    self.update()
+                }
+            }
+            catch
+            {
+                DispatchQueue.main.async {
+                    let toastView = RSTToastView(text: "Failed to update \(installedApp.app.name)", detailText: error.localizedDescription)
+                    toastView.tintColor = .altPurple
+                    toastView.show(in: self.navigationController?.view ?? self.view, duration: 2)
+                }
+            }
+            
+            DispatchQueue.main.async {
+                self.progressView.observedProgress = nil
+                self.progressView.progress = 0.0
+            }
+        }
+        
+        self.progressView.observedProgress = progress
+    }
+    
+    @objc func didFetchApps(_ notification: Notification)
+    {
+        DispatchQueue.main.async {
+            if self.dataSource.fetchedResultsController.fetchedObjects == nil
+            {
+                do { try self.dataSource.fetchedResultsController.performFetch() }
+                catch { print("Error fetching:", error) }
+            }
+            
+            self.update()
+        }
+    }
+}
+
+extension UpdatesViewController
+{
+    override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]?
+    {
+        let updateAction = UITableViewRowAction(style: .normal, title: "Update") { [weak self] (action, indexPath) in
+            guard let installedApp = self?.dataSource.item(at: indexPath) else { return }
+            self?.update(installedApp)
+        }
+        updateAction.backgroundColor = .altPurple
+        
+        return [updateAction]
+    }
+    
+    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)
+    {
+    }
 }