CW-949 backup error messages

lib/view_model/restore_from_backup_view_model.dart

@@ -13,13 +13,12 @@ import 'package:cake_wallet/store/authentication_store.dart';
 
 part 'restore_from_backup_view_model.g.dart';
 
-class RestoreFromBackupViewModel = RestoreFromBackupViewModelBase
-    with _$RestoreFromBackupViewModel;
+class RestoreFromBackupViewModel = RestoreFromBackupViewModelBase with _$RestoreFromBackupViewModel;
 
 abstract class RestoreFromBackupViewModelBase with Store {
   RestoreFromBackupViewModelBase(this.backupService)
-  : state = InitialExecutionState(),
-    filePath = '';
+      : state = InitialExecutionState(),
+        filePath = '';
 
   final BackupService backupService;
 
@@ -45,8 +44,14 @@ abstract class RestoreFromBackupViewModelBase with Store {
       final file = File(filePath);
       final data = await file.readAsBytes();
 
+
       await backupService.importBackup(data, password);
-      await initializeAppAtRoot(reInitializing: true);
+
+      try {
+        await initializeAppAtRoot(reInitializing: true);
+      } catch (e, s) {
+        throw Exception('failed_app_initialization: $e $s');
+      }
 
       final store = getIt.get<AppStore>();
       ReactionDisposer? reaction;
@@ -63,11 +68,25 @@ abstract class RestoreFromBackupViewModelBase with Store {
 
       state = ExecutedSuccessfullyState();
     } catch (e, s) {
-      var msg = e.toString();
+      var msg = e.toString().toLowerCase();
 
-      if (msg.toLowerCase().contains("message authentication code (mac)")) {
+      // can't use a switch here because of .contains() / not an exact match
+      bool shouldBeMadeAware = false;
+      if (msg.contains("message authentication code (mac)")) {
         msg = 'Incorrect backup password';
+      } else if (msg.contains("faileddecryption")) {
+        msg = 'Failed to decrypt backup file, please check you entered the right password';
+      } else if (msg.contains("failed_to_decode")) {
+        msg = 'Failed to decode backup file, please try again';
+        shouldBeMadeAware = true;
+      } else if (msg.contains("failed_app_initialization")) {
+        msg = 'Failed to initialize app, please try again';
+        shouldBeMadeAware = true;
       } else {
+        shouldBeMadeAware = true;
+      }
+
+      if (shouldBeMadeAware) {
         await ExceptionHandler.onError(FlutterErrorDetails(
           exception: e,
           stack: s,

lib/view_model/wallet_restore_view_model.dart

@@ -67,7 +67,6 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
         availableModes = [WalletRestoreMode.seed];
         break;
     }
-    isButtonEnabled = !hasSeedLanguageSelector && !hasBlockchainHeightLanguageSelector;
     walletCreationService.changeWalletType(type: type);
   }