improved loading

lib/main.dart

@@ -1,3 +1,4 @@
+import 'package:camera/camera.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -11,6 +12,7 @@ import 'package:quid_faciam_hodie/screens/server_loading_screen.dart';
 import 'package:quid_faciam_hodie/screens/timeline_screen.dart';
 import 'package:quid_faciam_hodie/screens/welcome_screen.dart';
 
+import 'managers/global_values_manager.dart';
 import 'models/memories.dart';
 
 void main() async {
@@ -21,6 +23,9 @@ void main() async {
     DeviceOrientation.portraitDown,
   ]);
 
+  GlobalValuesManager.setCameras(await availableCameras());
+  GlobalValuesManager.initializeServer();
+
   runApp(const MyApp());
 }
 

lib/managers/file_manager.dart

@@ -4,6 +4,7 @@ import 'dart:typed_data';
 import 'package:path_provider/path_provider.dart';
 import 'package:quid_faciam_hodie/enums.dart';
 import 'package:quid_faciam_hodie/foreign_types/memory.dart';
+import 'package:quid_faciam_hodie/managers/global_values_manager.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 import 'package:uuid/uuid.dart';
 
@@ -15,6 +16,8 @@ class FileManager {
   static Map<String, Uint8List> fileCache = {};
 
   static Future<Memory> getMemoryMetadata(final String id) async {
+    await GlobalValuesManager.waitForServerInitialization();
+
     final response = await supabase
         .from('memories')
         .select()
@@ -30,6 +33,8 @@ class FileManager {
   }
 
   static uploadFile(final User user, final File file) async {
+    await GlobalValuesManager.waitForServerInitialization();
+
     final basename = uuid.v4();
     final extension = file.path.split('.').last;
     final filename = '$basename.$extension';
@@ -106,6 +111,8 @@ class FileManager {
     final bool disableDownloadCache = false,
     final bool disableFileCache = false,
   }) async {
+    await GlobalValuesManager.waitForServerInitialization();
+
     final tempDirectory = await getTemporaryDirectory();
     final filename = '${tempDirectory.path}/$path';
     final file = File(filename);
@@ -125,6 +132,8 @@ class FileManager {
   }
 
   static Future<void> deleteFile(final String path) async {
+    await GlobalValuesManager.waitForServerInitialization();
+
     final response =
         await supabase.from('memories').delete().eq('location', path).execute();
 

lib/managers/global_values_manager.dart

@@ -1,11 +1,15 @@
 import 'package:camera/camera.dart';
+import 'package:flutter/foundation.dart';
+import 'package:quid_faciam_hodie/constants/apis.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
 
 class GlobalValuesManager {
-  static bool _hasBeenInitialized = false;
+  static Future? _serverInitializationFuture;
+  static bool _isServerInitialized = false;
   static List<CameraDescription> _cameras = [];
 
   static List<CameraDescription> get cameras => [..._cameras];
-  static bool get hasBeenInitialized => _hasBeenInitialized;
+  static bool get isServerInitialized => _isServerInitialized;
 
   static void setCameras(List<CameraDescription> cameras) {
     if (_cameras.isNotEmpty) {
@@ -15,7 +19,30 @@ class GlobalValuesManager {
     _cameras = cameras;
   }
 
-  static void setHasBeenInitialized(bool hasBeenInitialized) {
-    _hasBeenInitialized = hasBeenInitialized;
+  static void initializeServer() {
+    if (_isServerInitialized || _serverInitializationFuture != null) {
+      return;
+    }
+
+    _serverInitializationFuture = Supabase.initialize(
+      url: SUPABASE_API_URL,
+      anonKey: SUPABASE_API_KEY,
+      debug: kDebugMode,
+    )..then((_) {
+        _isServerInitialized = true;
+        _serverInitializationFuture = null;
+      });
+  }
+
+  static Future<void> waitForServerInitialization() async {
+    if (_serverInitializationFuture == null) {
+      if (_isServerInitialized) {
+        return;
+      } else {
+        throw Exception('Server has not been initialized yet');
+      }
+    }
+
+    await _serverInitializationFuture;
   }
 }

lib/models/memories.dart

@@ -1,5 +1,6 @@
 import 'package:property_change_notifier/property_change_notifier.dart';
 import 'package:quid_faciam_hodie/foreign_types/memory.dart';
+import 'package:quid_faciam_hodie/managers/global_values_manager.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 
 final supabase = Supabase.instance.client;
@@ -10,10 +11,10 @@ class Memories extends PropertyChangeNotifier<String> {
   Memories();
 
   RealtimeSubscription? _serverSubscription;
-  bool _isInitializing = true;
+  bool _isInitialized = false;
 
   List<Memory> get memories => _memories;
-  bool get isInitializing => _isInitializing;
+  bool get isInitialized => _isInitialized;
 
   @override
   void dispose() {
@@ -42,9 +43,9 @@ class Memories extends PropertyChangeNotifier<String> {
     notifyListeners('memories');
   }
 
-  void setIsInitializing(final bool value) {
-    _isInitializing = value;
-    notifyListeners('isInitializing');
+  void setIsInitialized(final bool value) {
+    _isInitialized = value;
+    notifyListeners('isInitialized');
   }
 
   void sortMemories() {
@@ -53,11 +54,11 @@ class Memories extends PropertyChangeNotifier<String> {
   }
 
   Future<void> initialize() async {
-    setIsInitializing(true);
+    setIsInitialized(false);
 
     await _loadInitialData();
 
-    setIsInitializing(false);
+    setIsInitialized(true);
     notifyListeners();
 
     // Watch new updates
@@ -100,6 +101,8 @@ class Memories extends PropertyChangeNotifier<String> {
   }
 
   Future<void> _loadInitialData() async {
+    await GlobalValuesManager.waitForServerInitialization();
+
     final response = await supabase
         .from('memories')
         .select()

lib/screens/main_screen.dart

@@ -62,7 +62,7 @@ class _MainScreenState extends AuthRequiredState<MainScreen> with Loadable {
   void initState() {
     super.initState();
 
-    callWithLoading(getLastPhoto);
+    getLastPhoto();
     onNewCameraSelected(GlobalValuesManager.cameras[0]);
   }
 

lib/screens/server_loading_screen.dart

@@ -1,8 +1,6 @@
-import 'package:camera/camera.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'package:quid_faciam_hodie/constants/apis.dart';
 import 'package:quid_faciam_hodie/constants/spacing.dart';
 import 'package:quid_faciam_hodie/managers/global_values_manager.dart';
 import 'package:quid_faciam_hodie/models/memories.dart';
@@ -15,7 +13,12 @@ import 'welcome_screen.dart';
 class ServerLoadingScreen extends StatefulWidget {
   static const ID = 'server_loading';
 
-  const ServerLoadingScreen({Key? key}) : super(key: key);
+  final String? nextScreen;
+
+  const ServerLoadingScreen({
+    Key? key,
+    this.nextScreen,
+  }) : super(key: key);
 
   @override
   State<ServerLoadingScreen> createState() => _ServerLoadingScreenState();
@@ -30,25 +33,20 @@ class _ServerLoadingScreenState extends State<ServerLoadingScreen> {
   }
 
   Future<void> load() async {
-    if (!GlobalValuesManager.hasBeenInitialized) {
-      GlobalValuesManager.setCameras(await availableCameras());
-
-      await Supabase.initialize(
-        url: SUPABASE_API_URL,
-        anonKey: SUPABASE_API_KEY,
-        debug: kDebugMode,
-      );
-
-      GlobalValuesManager.setHasBeenInitialized(true);
-    }
+    await GlobalValuesManager.waitForServerInitialization();
 
     final memories = context.read<Memories>();
     final session = Supabase.instance.client.auth.session();
 
     if (session != null) {
-      memories.initialize().then((_) {
-        Navigator.pushReplacementNamed(context, MainScreen.ID);
-      });
+      if (!memories.isInitialized) {
+        await memories.initialize();
+      }
+
+      Navigator.pushReplacementNamed(
+        context,
+        widget.nextScreen ?? MainScreen.ID,
+      );
     } else {
       Navigator.pushReplacementNamed(context, WelcomeScreen.ID);
     }

lib/widgets/today_photo_button.dart

@@ -3,6 +3,7 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:quid_faciam_hodie/constants/spacing.dart';
 import 'package:quid_faciam_hodie/enums.dart';
+import 'package:quid_faciam_hodie/screens/server_loading_screen.dart';
 import 'package:quid_faciam_hodie/screens/timeline_screen.dart';
 
 import 'raw_memory_display.dart';
@@ -27,7 +28,14 @@ class TodayPhotoButton extends StatelessWidget {
       onTap: () async {
         onLeave();
 
-        await Navigator.pushNamed(context, TimelineScreen.ID);
+        await Navigator.push(
+          context,
+          MaterialPageRoute(
+            builder: (context) => ServerLoadingScreen(
+              nextScreen: TimelineScreen.ID,
+            ),
+          ),
+        );
 
         onComeBack();
       },