Implemented exportJsonFile & importJsonFile methods

lib/utility/local_storage_service.dart

@@ -1,17 +1,34 @@
 import 'dart:convert';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:cabo_counter/data/game_session.dart';
 import 'package:cabo_counter/utility/globals.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:file_saver/file_saver.dart';
 import 'package:path_provider/path_provider.dart';
 
 class LocalStorageService {
   static const String _fileName = 'game_data.json';
 
-  /// Speichert GameSessions im App-Dokumentenverzeichnis
+  /// Writes the game session list to a  JSON file and returns it as string.
+  static String getJsonFile() {
+    final jsonFile =
+        Globals.gameList.map((session) => session.toJson()).toList();
+    return json.encode(jsonFile);
+  }
+
+  /// Returns the path to the local JSON file.
+  static Future<File> _getFilePath() async {
+    final directory = await getApplicationDocumentsDirectory();
+    final path = '${directory.path}/$_fileName';
+    return File(path);
+  }
+
+  /// Saves the game sessions to a local JSON file.
   static Future<void> saveGameSessions() async {
     try {
-      final file = await _getLocalFile();
+      final file = await _getFilePath();
       final jsonFile = getJsonFile();
       await file.writeAsString(jsonFile);
       print('Daten gespeichert');
@@ -20,44 +37,82 @@ class LocalStorageService {
     }
   }
 
-  /// Lädt GameSessions aus dem App-Dokumentenverzeichnis
+  /// Loads the game data from a local JSON file.
   static Future<void> loadGameSessions() async {
-    print('Versuche, Daten zu laden...'); // FIXME Debug-Ausgabe
+    print('Versuche, Daten zu laden...');
     try {
-      final file = await _getLocalFile();
+      final file = await _getFilePath();
       if (await file.exists()) {
-        print('Datei existiert'); // FIXME Debug-Ausgabe
+        print('Es existiert bereits eine Datei mit Spieldaten');
         final jsonString = await file.readAsString();
         if (jsonString.isNotEmpty) {
-          print('Datei ist nicht leer'); // FIXME Debug-Ausgabe
+          print('Die Datei ist nicht leer');
           final jsonList = json.decode(jsonString) as List<dynamic>;
-          print('JSON: $jsonList'); // FIXME Debug-Ausgabe
+          print('JSON: $jsonList');
-          Globals.gameList =
+          Globals.gameList = jsonList
-              jsonList.map((json) => GameSession.fromJson(json)).toList();
+              .map((jsonItem) =>
-          print('Daten erfolgreich geladen');
+                  GameSession.fromJson(jsonItem as Map<String, dynamic>))
+              .toList()
+              .cast<GameSession>(); // Explicit cast to List<GameSession>
+          print('Die Daten wurden erfolgreich geladen');
         } else {
-          print('Datei ist leer');
+          print('Die Datei ist leer');
         }
       } else {
-        print('Datei existiert nicht');
+        print('Es existiert bisher noch keine Datei mit Spieldaten');
       }
     } catch (e) {
-      print('Fehler beim Laden: $e');
+      print('Fehler beim Laden der Spieldaten:\n$e');
-      // Bei Fehler eine leere Liste setzen
       Globals.gameList = [];
     }
   }
 
-  static String getJsonFile() {
+  /// Opens the file picker to save a JSON file with the current game data.
-    final jsonFile =
+  static Future<void> exportJsonFile() async {
-        Globals.gameList.map((session) => session.toJson()).toList();
+    final jsonString = getJsonFile();
-    return json.encode(jsonFile);
+    try {
+      final bytes = Uint8List.fromList(utf8.encode(jsonString));
+      final result = await FileSaver.instance.saveAs(
+        name: 'cabo_counter_data',
+        bytes: bytes,
+        ext: 'json',
+        mimeType: MimeType.json,
+      );
+      print('Datei gespeichert: $result');
+    } catch (e) {
+      print('Fehler beim Speichern: $e');
+    }
   }
 
-  static Future<File> _getLocalFile() async {
+  static Future<bool> importJsonFile() async {
-    final directory = await getApplicationDocumentsDirectory();
+    try {
-    final path = '${directory.path}/$_fileName';
+      final result = await FilePicker.platform.pickFiles(
-    print('Speicherpfad: $path'); // FIXME Debug-Ausgabe
+        type: FileType.custom,
-    return File(path);
+        allowedExtensions: ['json'],
+      );
+      String jsonString = '';
+      if (result != null) {
+        if (result.files.single.bytes != null) {
+          final Uint8List fileBytes = result.files.single.bytes!;
+          jsonString = utf8.decode(fileBytes);
+        } else if (result.files.single.path != null) {
+          final file = File(result.files.single.path!);
+          jsonString = await file.readAsString();
+        }
+        final jsonList = json.decode(jsonString) as List<dynamic>;
+        print('JSON Inhalt: $jsonList');
+        Globals.gameList = jsonList
+            .map((jsonItem) =>
+                GameSession.fromJson(jsonItem as Map<String, dynamic>))
+            .toList();
+        return true;
+      } else {
+        print('Der Dialog wurde abgebrochen');
+        return false;
+      }
+    } catch (e) {
+      print('Fehler beim Importieren: $e');
+      return false;
+    }
   }
 }

lib/views/information_view.dart

@@ -1,3 +1,4 @@
+import 'package:cabo_counter/utility/local_storage_service.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
@@ -83,7 +84,10 @@ class InformationView extends StatelessWidget {
                 ),
                 CupertinoButton(
                     child: const Text('Spieldaten exportieren'),
-                    onPressed: () => {saveJsonToDevice()})
+                    onPressed: () => LocalStorageService.exportJsonFile()),
+                CupertinoButton(
+                    child: const Text('Spieldaten importieren'),
+                    onPressed: () => LocalStorageService.importJsonFile()),
               ],
             ),
             Positioned(
@@ -115,8 +119,4 @@ class InformationView extends StatelessWidget {
           ],
         )));
   }
-
-  void saveJsonToDevice() async {
-    //todo: implement
-  }
 }

pubspec.yaml

@@ -2,7 +2,7 @@ name: cabo_counter
 description: "Mobile app for the card game Cabo"
 publish_to: 'none'
 
-version: 0.1.3+103
+version: 0.1.3+107
 
 environment:
   sdk: ^3.5.4
@@ -17,6 +17,9 @@ dependencies:
   flutter_keyboard_visibility: ^6.0.0
   path_provider: ^2.1.1
   file_picker: any
+  file_saver: ^0.2.6
+  typed_data: ^1.3.2
+
 
 dev_dependencies:
   flutter_test: