improvements & bugfixes; added cache manager

lib/constants/storage_keys.dart

@@ -1 +1 @@
-const STARTUP_PAGE_KEY = 'startup_page';
+const CACHE_KEY = '_cache';

lib/constants/values.dart

@@ -7,3 +7,4 @@ const PHOTO_SHOW_AFTER_CREATION_DURATION = Duration(milliseconds: 500);
 final UnmodifiableSetView<double> DEFAULT_ZOOM_LEVELS =
     UnmodifiableSetView({0.6, 1, 2, 5, 10, 20, 50, 100});
 const CALENDAR_DATE_IN_MAX_DELAY = Duration(milliseconds: 500);
+const CACHE_INVALIDATION_DURATION = Duration(days: 7);

lib/main.dart

@@ -13,6 +13,7 @@ import 'package:quid_faciam_hodie/screens/server_loading_screen.dart';
 import 'package:quid_faciam_hodie/screens/settings_screen.dart';
 import 'package:quid_faciam_hodie/screens/timeline_screen.dart';
 import 'package:quid_faciam_hodie/screens/welcome_screen.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
 
 import 'managers/global_values_manager.dart';
 import 'models/memories.dart';
@@ -43,6 +44,27 @@ class MyApp extends StatefulWidget {
 class _MyAppState extends State<MyApp> {
   final memories = Memories();
 
+  @override
+  void initState() {
+    super.initState();
+
+    watchAuthenticationStatus();
+  }
+
+  Future<void> watchAuthenticationStatus() async {
+    await GlobalValuesManager.waitForServerInitialization();
+
+    Supabase.instance.client.auth.onAuthStateChange((event, session) {
+      switch (event) {
+        case AuthChangeEvent.signedIn:
+          memories.refresh();
+          break;
+        default:
+          break;
+      }
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return ChangeNotifierProvider.value(

lib/managers/authentication_manager.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:quid_faciam_hodie/extensions/snackbar.dart';
-import 'package:quid_faciam_hodie/screens/login_screen.dart';
 import 'package:quid_faciam_hodie/screens/main_screen.dart';
+import 'package:quid_faciam_hodie/screens/welcome_screen.dart';
 import 'package:supabase/supabase.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 
@@ -10,7 +10,7 @@ class AuthState<T extends StatefulWidget> extends SupabaseAuthState<T> {
   void onUnauthenticated() {
     if (mounted) {
       Navigator.of(context)
-          .pushNamedAndRemoveUntil(LoginScreen.ID, (route) => false);
+          .pushNamedAndRemoveUntil(WelcomeScreen.ID, (route) => false);
     }
   }
 

lib/managers/cache_manager.dart

@@ -0,0 +1,55 @@
+import 'dart:convert';
+
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:quid_faciam_hodie/constants/storage_keys.dart';
+import 'package:quid_faciam_hodie/constants/values.dart';
+
+const storage = FlutterSecureStorage();
+
+class CacheManager {
+  static _createKey(final String key) => '$CACHE_KEY/$key';
+
+  static Future<bool> isCacheValid(final String key) async {
+    final cacheKey = _createKey(key);
+    final existingEntry = await storage.read(key: cacheKey);
+
+    if (existingEntry != null) {
+      final entry = jsonDecode(existingEntry);
+      final DateTime creationDate = DateTime.parse(entry['creationDate']);
+
+      // Check if the entry is still valid using CACHE_INVALIDATION_DURATION as the validity duration.
+      return DateTime.now().difference(creationDate) <
+          CACHE_INVALIDATION_DURATION;
+    }
+
+    return false;
+  }
+
+  static Future<void> set(final String key, final String data) async {
+    final cacheKey = _createKey(key);
+    final cacheEntry = {
+      'creationDate': DateTime.now().toIso8601String(),
+      'data': data,
+    };
+
+    return storage.write(
+      key: cacheKey,
+      value: json.encode({
+        key: cacheEntry,
+      }),
+    );
+  }
+
+  static Future<String?> get(final String key) async {
+    final cacheKey = _createKey(key);
+    final existingEntry = await storage.read(key: cacheKey);
+
+    if (existingEntry == null) {
+      return null;
+    }
+
+    final entry = jsonDecode(existingEntry);
+
+    return entry['data'];
+  }
+}

lib/managers/file_manager.dart

@@ -1,20 +1,20 @@
 import 'dart:io';
 import 'dart:typed_data';
 
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 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/cache_manager.dart';
 import 'package:quid_faciam_hodie/managers/global_values_manager.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 import 'package:uuid/uuid.dart';
 
 const uuid = Uuid();
+const storage = FlutterSecureStorage();
 
 final supabase = Supabase.instance.client;
 
 class FileManager {
-  static Map<String, Uint8List> fileCache = {};
-
   static Future<Memory> getMemoryMetadata(final String id) async {
     await GlobalValuesManager.waitForServerInitialization();
 
@@ -56,51 +56,31 @@ class FileManager {
     }
   }
 
-  static Future<List?> getLastFile(final User user) async {
-    final response = await supabase
-        .from('memories')
-        .select()
-        .eq('user_id', user.id)
-        .order('created_at', ascending: false)
-        .limit(1)
-        .single()
-        .execute();
-
-    if (response.data == null) {
-      return null;
-    }
-
-    final memory = response.data;
-    final location = memory['location'];
-    final memoryType =
-        location.split('.').last == 'jpg' ? MemoryType.photo : MemoryType.video;
-
-    try {
-      final file = await _getFileData('memories', location);
-
-      return [file, memoryType];
-    } catch (error) {
-      return null;
-    }
-  }
-
-  static Future<Uint8List> _getFileData(final String table, final String path,
-      {final bool disableCache = false}) async {
-    final key = '$table:$path';
-
-    if (!disableCache && fileCache.containsKey(key)) {
-      return fileCache[key]!;
-    }
-
+  static Future<Uint8List> _downloadFileData(
+      final String table, final String path) async {
     final response = await supabase.storage.from(table).download(path);
 
     if (response.error != null) {
       throw Exception('Error downloading file: ${response.error!.message}');
     }
 
-    final data = response.data!;
+    return response.data!;
+  }
 
-    fileCache[key] = data;
+  static Future<Uint8List> _getFileData(final String table, final String path,
+      {final bool disableCache = false}) async {
+    final key = '$table:$path';
+
+    // Check cache
+    if (!disableCache && await CacheManager.isCacheValid(key)) {
+      final data = (await CacheManager.get(key))!;
+      return Uint8List.fromList(data.codeUnits);
+    }
+
+    final data = await _downloadFileData(table, path);
+
+    final cacheData = String.fromCharCodes(data);
+    await CacheManager.set(key, cacheData);
 
     return data;
   }

lib/models/memories.dart

@@ -68,6 +68,13 @@ class Memories extends PropertyChangeNotifier<String> {
         .subscribe();
   }
 
+  Future<void> refresh() async {
+    memories.clear();
+    _serverSubscription?.unsubscribe();
+
+    setIsInitialized(false);
+  }
+
   Future<void> _onServerUpdate(
     final SupabaseRealtimePayload response,
   ) async {

lib/screens/login_screen.dart

@@ -73,7 +73,6 @@ class _LoginScreenState extends AuthState<LoginScreen> with Loadable {
             message: localizations.loginScreenLoginFailed,
           );
 
-          emailController.clear();
           passwordController.clear();
         }
         return;

lib/screens/settings_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_platform_widgets/flutter_platform_widgets.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:intl/intl.dart';
 import 'package:quid_faciam_hodie/constants/spacing.dart';
 import 'package:quid_faciam_hodie/extensions/snackbar.dart';
@@ -14,6 +15,8 @@ import 'package:supabase_flutter/supabase_flutter.dart';
 
 final supabase = Supabase.instance.client;
 
+const storage = FlutterSecureStorage();
+
 class SettingsScreen extends StatefulWidget {
   static const ID = '/settings';