Improves App ID counting + management

Fetches App ID count directly from Apple, and adds AppIDsViewController to view all App IDs for the logged-in account.

AltStore/My Apps/MyAppsViewController.swift

@@ -113,6 +113,8 @@ class MyAppsViewController: UICollectionViewController
         super.viewWillAppear(animated)
         
         self.updateDataSource()
+        
+        self.fetchAppIDs()
     }
     
     override func prepare(for segue: UIStoryboardSegue, sender: Any?)
@@ -142,6 +144,10 @@ class MyAppsViewController: UICollectionViewController
         let installedApp = self.dataSource.item(at: indexPath)
         return !installedApp.isSideloaded
     }
+    
+    @IBAction func unwindToMyAppsViewController(_ segue: UIStoryboardSegue)
+    {
+    }
 }
 
 private extension MyAppsViewController
@@ -373,6 +379,21 @@ private extension MyAppsViewController
         }        
     }
     
+    func fetchAppIDs()
+    {
+        AppManager.shared.fetchAppIDs { (result) in
+            do
+            {
+                let (_, context) = try result.get()
+                try context.save()
+            }
+            catch
+            {
+                print("Failed to fetch App IDs.", error)
+            }
+        }
+    }
+    
     func refresh(_ installedApps: [InstalledApp], completionHandler: @escaping (Result<[String : Result<InstalledApp, Error>], Error>) -> Void)
     {
         func refresh()
@@ -700,19 +721,6 @@ private extension MyAppsViewController
         
         self.present(alertController, animated: true, completion: nil)
     }
-    
-    @IBAction func presentAppIDHelpAlert(_ sender: UIButton)
-    {
-        let message = NSLocalizedString("""
-Each app and app extension installed with AltStore must register an App ID with Apple. Apple limits free developer accounts to 10 App IDs at a time.
-
-App IDs expire after one week, but AltStore will automatically renew them for all installed apps. Once an App ID expires, it no longer counts toward your total.
-""", comment: "")
-        
-        let alertController = UIAlertController(title: NSLocalizedString("What are App IDs?", comment: ""), message: message, preferredStyle: .alert)
-        alertController.addAction(.ok)
-        self.present(alertController, animated: true, completion: nil)
-    }
 }
 
 private extension MyAppsViewController
@@ -843,24 +851,30 @@ extension MyAppsViewController
             return headerView
             
         case .installedApps:
-            let installedApps = self.installedAppsDataSource.fetchedResultsController.fetchedObjects ?? []
-            let registeredAppIDs = installedApps.filter { $0.team?.isActiveTeam ?? false }.reduce(0) { (sum, installedApp) in
-                // Each InstallApp has it's own app ID, plus one for each app extension.
-                return sum + 1 + installedApp.appExtensions.count
-            }
-            
-            let maximumAppIDCount = 10
-            let remainingAppIDs = max(maximumAppIDCount - registeredAppIDs, 0)
-            
             let footerView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionFooter, withReuseIdentifier: "InstalledAppsFooter", for: indexPath) as! InstalledAppsCollectionFooterView
             
-            if remainingAppIDs == 1
+            guard let team = DatabaseManager.shared.activeTeam() else { return footerView }
+            switch team.type
             {
-                footerView.textLabel.text = String(format: NSLocalizedString("1 App ID Remaining", comment: ""))
-            }
-            else
-            {
-                footerView.textLabel.text = String(format: NSLocalizedString("%@ App IDs Remaining", comment: ""), NSNumber(value: remainingAppIDs))
+            case .free:
+                let registeredAppIDs = team.appIDs.count
+                
+                let maximumAppIDCount = 10
+                let remainingAppIDs = max(maximumAppIDCount - registeredAppIDs, 0)
+                
+                if remainingAppIDs == 1
+                {
+                    footerView.textLabel.text = String(format: NSLocalizedString("1 App ID Remaining", comment: ""))
+                }
+                else
+                {
+                    footerView.textLabel.text = String(format: NSLocalizedString("%@ App IDs Remaining", comment: ""), NSNumber(value: remainingAppIDs))
+                }
+                
+                footerView.textLabel.isHidden = false
+                
+            case .individual, .organization, .unknown: footerView.textLabel.isHidden = true
+            @unknown default: break
             }
             
             return footerView
@@ -941,14 +955,15 @@ extension MyAppsViewController: UICollectionViewDelegateFlowLayout
         case .updates: return .zero
         case .installedApps:
             #if BETA
-            if let team = DatabaseManager.shared.activeTeam(), team.type == .free
-            {
-                return CGSize(width: collectionView.bounds.width, height: 44)
-            }
-            else
-            {
-                return .zero
-            }
+            guard let _ = DatabaseManager.shared.activeTeam() else { return .zero }
+            
+            let indexPath = IndexPath(row: 0, section: section.rawValue)
+            let footerView = self.collectionView(collectionView, viewForSupplementaryElementOfKind: UICollectionView.elementKindSectionFooter, at: indexPath) as! InstalledAppsCollectionFooterView
+                        
+            let size = footerView.systemLayoutSizeFitting(CGSize(width: collectionView.frame.width, height: UIView.layoutFittingExpandedSize.height),
+                                                          withHorizontalFittingPriority: .required,
+                                                          verticalFittingPriority: .fittingSizeLevel)
+            return size
             #else
             return .zero
             #endif