refactor(app): move data deletion to Hive utils

app/lib/common/utilities/hive_utils.dart

@@ -1,7 +1,11 @@
 import 'dart:convert';
+import 'dart:io';
 
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:hive/hive.dart';
+import 'package:path_provider/path_provider.dart';
+
+import '../module.dart';
 
 Future<List<int>> retrieveExistingOrGenerateKey() async {
   const secureStorage = FlutterSecureStorage();
@@ -17,3 +21,31 @@ Future<List<int>> retrieveExistingOrGenerateKey() async {
   final key = await secureStorage.read(key: 'key');
   return base64Url.decode(key!);
 }
+
+Future<void> deleteAllAppData() async {
+  await _deleteCacheDir();
+  await _deleteAppDir();
+  await UserData.erase();
+  await MetaData.erase();
+  await DrugsWithGuidelines.erase();
+}
+
+// The folders themselves cannot be deleted on iOS, therefore delete all content
+// inside the folders
+void _deleteFolderContent(Directory directory) {
+  if (!directory.existsSync()) return;
+  for (final item in directory.listSync()) {
+    item.deleteSync(recursive: true);
+  }
+}
+
+Future<void> _deleteCacheDir() async {
+  final tempDir = await getTemporaryDirectory();
+  _deleteFolderContent(tempDir);
+}
+
+Future<void> _deleteAppDir() async {
+  final appDocDir = await getApplicationDocumentsDirectory();
+  _deleteFolderContent(appDocDir);
+}
+

app/lib/more/pages/more.dart

@@ -1,5 +1,5 @@
 import '../../common/module.dart';
-import '../utils.dart';
+import '../../common/utilities/hive_utils.dart';
 
 @RoutePage()
 class MorePage extends StatelessWidget {