added persisted app settings

lib/pages/settings_page.dart

@@ -2,10 +2,12 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 import 'package:permission_handler/permission_handler.dart';
+import 'package:provider/provider.dart';
 
 import '../l10n/app_localizations.dart';
 import '../service/notifying.dart';
 import '../service/permission_service.dart';
+import '../service/settings_provider.dart';
 import '../service/storage.dart';
 
 class SettingsPage extends StatefulWidget {
@@ -29,10 +31,16 @@ class _SettingsPageState extends State<SettingsPage> {
     super.initState();
   }
 
+  // TODO: Localize
   @override
   Widget build(BuildContext context) {
     final titlePadding = Theme.of(context).listTileTheme.contentPadding!;
-    checkStoragePermission;
+    checkStoragePermission();
+    final alwaysExportEnabled = context
+        .watch<SettingsProvider>()
+        .settings
+        .alwaysExportEnabled;
+
     return Scaffold(
       appBar: AppBar(title: Text(AppLocalizations.of(context)!.settings)),
       body: Center(
@@ -51,9 +59,11 @@ class _SettingsPageState extends State<SettingsPage> {
               SizedBox(height: tileSpacing),
               ListTile(
                 title: Text('Grant storage permisson'),
-                subtitle: Text(
-                  'For app-data settings to work, you need to grant the app permissions to manage internal storage.',
-                ),
+                subtitle: storagePermissionIsGranted
+                    ? Text('Storage permission granted')
+                    : Text(
+                        'For app-data settings to work, you need to grant the app permissions to manage internal storage.',
+                      ),
                 onTap: () => PermissionService.requestStoragePermission,
                 trailing: Icon(Icons.arrow_forward_ios_rounded),
                 enabled: !storagePermissionIsGranted,
@@ -62,7 +72,7 @@ class _SettingsPageState extends State<SettingsPage> {
               ListTile(
                 title: Text(AppLocalizations.of(context)!.import),
                 subtitle: Text('Import app-data from a json file.'),
-                onTap: () => onActivateJsonImportPressed(),
+                onTap: () => onJsonImportPressed(),
                 trailing: Icon(Icons.arrow_forward_ios_rounded),
                 enabled: storagePermissionIsGranted,
               ),
@@ -72,10 +82,39 @@ class _SettingsPageState extends State<SettingsPage> {
                 subtitle: Text(
                   'Export app-data to a json file in the selected directory.',
                 ),
-                onTap: () => onActivateJsonExportPressed(),
+                onTap: () => onJsonExportPressed(),
                 trailing: Icon(Icons.arrow_forward_ios_rounded),
                 enabled: storagePermissionIsGranted,
               ),
+              SizedBox(height: tileSpacing),
+              ListTile(
+                title: Text('Always save to file'),
+                subtitle: Text(
+                  'Export app data to a directory, every time you make a change',
+                ),
+                onTap: () => onAlwaysSaveToJsonPressed(),
+                trailing: Checkbox(
+                  value: alwaysExportEnabled,
+                  onChanged: (value) {
+                    onAlwaysSaveToJsonPressed();
+                  },
+                ),
+                enabled: storagePermissionIsGranted,
+              ),
+              if (alwaysExportEnabled) SizedBox(height: tileSpacing),
+              if (alwaysExportEnabled)
+                ListTile(
+                  title: Text('Change export directory'),
+                  subtitle: Text(
+                    context
+                        .watch<SettingsProvider>()
+                        .settings
+                        .exportDirectoryPath,
+                  ),
+                  onTap: () => onChangeExportDirectoryPressed(),
+                  trailing: Icon(Icons.arrow_forward_ios_rounded),
+                  enabled: storagePermissionIsGranted,
+                ),
             ],
           ),
         ),
@@ -83,23 +122,54 @@ class _SettingsPageState extends State<SettingsPage> {
     );
   }
 
-  void onActivateJsonExportPressed() async {
-    if (!await PermissionService.storagePermissionStatus.isGranted) return;
+  void onJsonExportPressed() async {
+    if (!await checkStoragePermission()) return;
     Storage.exportToJsonFile().then(showExportInfo);
   }
 
-  void onActivateJsonImportPressed() async {
-    if (!await PermissionService.storagePermissionStatus.isGranted) return;
+  void onJsonImportPressed() async {
+    if (!await checkStoragePermission()) return;
     Storage.importFromJsonFile().then(showImportInfo);
   }
 
-  Future<void> get checkStoragePermission async {
+  void onAlwaysSaveToJsonPressed() async {
+    if (context.read<SettingsProvider>().settings.alwaysExportEnabled) {
+      context.read<SettingsProvider>().setExportDirectoryPath('', silent: true);
+      context.read<SettingsProvider>().setAlwaysExportEnabled(false);
+      return;
+    }
+
+    if (!await PermissionService.storagePermissionStatus.isGranted) return;
+    final dir = await Storage.selectDirectoryPath();
+    if (dir.isEmpty || !context.mounted) return;
+
+    // ignore: use_build_context_synchronously
+    context.read<SettingsProvider>().setExportDirectoryPath(dir, silent: true);
+
+    // ignore: use_build_context_synchronously
+    Storage.saveDataToFile().whenComplete(
+      // ignore: use_build_context_synchronously
+      () => context.read<SettingsProvider>().setAlwaysExportEnabled(true),
+    );
+  }
+
+  void onChangeExportDirectoryPressed() async {
+    if (!await PermissionService.storagePermissionStatus.isGranted) return;
+    final dir = await Storage.selectDirectoryPath();
+    if (dir.isEmpty || !context.mounted) return;
+
+    // ignore: use_build_context_synchronously
+    context.read<SettingsProvider>().setExportDirectoryPath(dir);
+  }
+
+  Future<bool> checkStoragePermission() async {
     PermissionService.storagePermissionStatus.then((value) {
-      storagePermissionIsGranted = value.isGranted;
       if (context.mounted && value.isGranted != storagePermissionIsGranted) {
+        storagePermissionIsGranted = value.isGranted;
         setState(() {});
       }
     });
+    return storagePermissionIsGranted;
   }
 
   void showExportInfo(bool success) => Notifying.showSnackbar(