init commit - bring project over from Mood

Shared/FeelsApp.swift

@@ -2,19 +2,67 @@
 //  FeelsApp.swift
 //  Shared
 //
-//  Created by Trey Tartt on 1/10/22.
+//  Created by Trey Tartt on 1/5/22.
 //
 
 import SwiftUI
+import BackgroundTasks
 
 @main
 struct FeelsApp: App {
+    @Environment(\.scenePhase) private var scenePhase
     let persistenceController = PersistenceController.shared
-
+    
+    init() {
+//        persistenceController.fillInMissingDates()
+        
+        BGTaskScheduler.shared.cancelAllTaskRequests()
+        BGTaskScheduler.shared.register(forTaskWithIdentifier: BGTask.updateDBMissingID, using: nil) { (task) in
+            BGTask.runFillInMissingDatesTask(task: task as! BGProcessingTask)
+        }
+    }
+    
     var body: some Scene {
         WindowGroup {
             ContentView()
                 .environment(\.managedObjectContext, persistenceController.container.viewContext)
+        }.onChange(of: scenePhase) { phase in
+            if phase == .background {
+                BGTask.scheduleBackgroundProcessing()
+                print("background")
+            }
+        }
+    }
+}
+
+class BGTask {
+    static let updateDBMissingID = "com.88oak.dbUpdateMissing"
+    
+    class func runFillInMissingDatesTask(task: BGProcessingTask) {
+        BGTask.scheduleBackgroundProcessing()
+        
+        task.expirationHandler = {
+            task.setTaskCompleted(success: false)
+        }
+        
+        PersistenceController.shared.fillInMissingDates()
+        task.setTaskCompleted(success: true)
+    }
+    
+    @available(iOS 13.0, *)
+    class func scheduleBackgroundProcessing() {
+        let request = BGProcessingTaskRequest(identifier: BGTask.updateDBMissingID)
+        request.requiresNetworkConnectivity = false
+        request.requiresExternalPower = false
+        
+        var runDate = Calendar.current.date(byAdding: .day, value: 1, to: Date())
+        runDate = Calendar.current.date(bySettingHour: 0, minute: 1, second: 0, of: runDate!)
+        request.earliestBeginDate = runDate
+        
+        do {
+            try BGTaskScheduler.shared.submit(request)
+        } catch {
+            print("Could not schedule image fetch: (error)")
         }
     }
 }