up and download data

lib/controllers/home_controller.dart

@@ -1,17 +1,126 @@
+import 'dart:io';
+import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:get/get.dart';
-
+import 'package:file_picker/file_picker.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:share_plus/share_plus.dart';
+import 'dart:convert';
+import '../helpers/filament_repository.dart';
 import '../pages/list_view.dart';
+import '../helpers/web_download_helper_stub.dart'
+    if (dart.library.html) '../helpers/web_download_helper.dart';
 
 class HomeController extends GetxController {
   void loadFilaments() {
     // Navigiere zur Listenseite
     Get.toNamed(ListPage.namedRoute);
   }
-  void downloadFilaments() {
-    // JSON Backup file herunterladen
+
+  Future<void> downloadFilaments() async {
+    try {
+      // JSON-Daten vom Repository holen
+      final jsonData = FilamentRepository.to.exportToJson();
+
+      if (kIsWeb) {
+        // Web: Download direkt im Browser
+        final fileName =
+            'filament_backup_${DateTime.now().millisecondsSinceEpoch}.json';
+        downloadJsonFileWeb(jsonData, fileName);
+      } else {
+        // Mobile/Desktop: Datei speichern und teilen
+        await _downloadForMobile(jsonData);
+      }
+
+      Get.snackbar(
+        'Erfolg',
+        'Backup wurde erstellt',
+        snackPosition: SnackPosition.BOTTOM,
+        backgroundColor: Get.theme.colorScheme.primary.withAlpha(26),
+        colorText: Get.theme.colorScheme.primary,
+        duration: Duration(seconds: 3),
+      );
+    } catch (e) {
+      Get.snackbar(
+        'Fehler',
+        'Backup konnte nicht erstellt werden: $e',
+        snackPosition: SnackPosition.BOTTOM,
+        backgroundColor: Get.theme.colorScheme.error.withAlpha(26),
+        colorText: Get.theme.colorScheme.error,
+      );
+    }
   }
 
-  void restoreFilaments() {
-    // JSON Backup file wiederherstellen
+  Future<void> _downloadForMobile(String jsonData) async {
+    // Temporäre Datei erstellen
+    final directory = await getTemporaryDirectory();
+    final fileName =
+        'filament_backup_${DateTime.now().millisecondsSinceEpoch}.json';
+    final file = File('${directory.path}/$fileName');
+
+    await file.writeAsString(jsonData);
+
+    // Datei über Share-Dialog teilen
+    await Share.shareXFiles([XFile(file.path)], text: 'Filament Backup');
+  }
+
+  Future<void> restoreFilaments() async {
+    try {
+      // Datei auswählen
+      FilePickerResult? result = await FilePicker.platform.pickFiles(
+        type: FileType.custom,
+        allowedExtensions: ['json'],
+      );
+
+      if (result != null) {
+        String? jsonData;
+
+        if (kIsWeb) {
+          // Web: Bytes direkt lesen
+          final bytes = result.files.first.bytes;
+          if (bytes != null) {
+            jsonData = utf8.decode(bytes);
+          }
+        } else {
+          // Mobile/Desktop: Datei von Pfad lesen
+          final path = result.files.first.path;
+          if (path != null) {
+            final file = File(path);
+            jsonData = await file.readAsString();
+          }
+        }
+
+        if (jsonData != null) {
+          // Daten importieren
+          final success = await FilamentRepository.to.importFromJson(jsonData);
+
+          if (success) {
+            Get.snackbar(
+              'Erfolg',
+              'Backup wurde erfolgreich wiederhergestellt',
+              snackPosition: SnackPosition.BOTTOM,
+              backgroundColor: Get.theme.colorScheme.primary.withAlpha(26),
+              colorText: Get.theme.colorScheme.primary,
+              duration: Duration(seconds: 3),
+            );
+          } else {
+            Get.snackbar(
+              'Fehler',
+              'Ungültige Backup-Datei',
+              snackPosition: SnackPosition.BOTTOM,
+              backgroundColor: Get.theme.colorScheme.error.withAlpha(26),
+              colorText: Get.theme.colorScheme.error,
+            );
+          }
+        }
+      }
+    } catch (e) {
+      Get.snackbar(
+        'Fehler',
+        'Wiederherstellung fehlgeschlagen: $e',
+        snackPosition: SnackPosition.BOTTOM,
+        backgroundColor: Get.theme.colorScheme.error.withAlpha(26),
+        colorText: Get.theme.colorScheme.error,
+      );
+    }
   }
 }

lib/helpers/web_download_helper.dart

@@ -0,0 +1,15 @@
+import 'dart:convert';
+// ignore: avoid_web_libraries_in_flutter
+import 'dart:html' as html;
+
+void downloadJsonFileWeb(String jsonData, String fileName) {
+  final bytes = utf8.encode(jsonData);
+  final blob = html.Blob([bytes]);
+  final url = html.Url.createObjectUrlFromBlob(blob);
+
+  final anchor = html.AnchorElement(href: url)
+    ..setAttribute('download', fileName)
+    ..click();
+
+  html.Url.revokeObjectUrl(url);
+}

lib/helpers/web_download_helper_stub.dart

@@ -0,0 +1,3 @@
+void downloadJsonFileWeb(String jsonData, String fileName) {
+  throw UnsupportedError('Web download is only supported on web platform');
+}