add import export and items

lib/controller/home_controller.dart

@@ -43,17 +43,17 @@ class HomeController extends GetxController {
   final preisController = TextEditingController();
   final markeController = TextEditingController();
   final gewichtController = TextEditingController();
+  final materialController = TextEditingController(text: 'PLA');
 
   final kaufdatum = DateTime.now().obs;
   final material = 'PLA'.obs;
   final editingId = RxnString();
 
-  final materialien = [
+  static const defaultMaterialien = [
     'PLA',
     'PLA+',
     'PLA light',
     'PLA-CF',
-    'PLA+',
     'PETG',
     'PETG-CF',
     'ABS',
@@ -61,11 +61,74 @@ class HomeController extends GetxController {
     'TPU',
     'Sonstiges',
   ];
+  final materialien = defaultMaterialien.toList().obs;
+  final materialMessage = RxnString();
+  final isSavingMaterial = false.obs;
 
   @override
   void onInit() {
     super.onInit();
     loadFilamente();
+    loadMaterialien();
+    selectMaterial(materialien.firstOrNull ?? '');
+  }
+
+  void loadMaterialien() {
+    final saved = storage.getModelList(StorageKeys.materialien);
+    if (saved.isNotEmpty) {
+      materialien.assignAll((saved.single['werte'] as List).cast<String>());
+    } else {
+      materialien.assignAll({
+        ...defaultMaterialien,
+        ...filamente.map((filament) => filament.material),
+      });
+    }
+  }
+
+  void selectMaterial(String value) {
+    material.value = value;
+    materialController.text = value;
+  }
+
+  Future<bool> addMaterial() async {
+    final value = materialController.text.trim();
+    if (value.isEmpty) {
+      materialMessage.value = 'Bitte eine Materialart eingeben.';
+      return false;
+    }
+    final existing = materialien.firstWhereOrNull(
+      (item) => item.toLowerCase() == value.toLowerCase(),
+    );
+    if (existing != null) {
+      materialMessage.value = null;
+      selectMaterial(existing);
+      return true;
+    }
+    final saved = await _saveMaterialien([...materialien, value]);
+    if (saved) selectMaterial(value);
+    return saved;
+  }
+
+  Future<bool> removeMaterial(String value) =>
+      _saveMaterialien(materialien.where((item) => item != value).toList());
+
+  Future<bool> _saveMaterialien(List<String> values) async {
+    if (isSavingMaterial.value) return false;
+    isSavingMaterial.value = true;
+    materialMessage.value = null;
+    try {
+      await storage.saveModelList(StorageKeys.materialien, [
+        {'werte': values},
+      ]);
+      materialien.assignAll(values);
+      return true;
+    } catch (_) {
+      materialMessage.value =
+          'Artenliste konnte nicht gespeichert werden. Bitte erneut versuchen.';
+      return false;
+    } finally {
+      isSavingMaterial.value = false;
+    }
   }
 
   void loadFilamente() {
@@ -116,6 +179,8 @@ class HomeController extends GetxController {
       return;
     }
 
+    if (!await addMaterial()) return;
+    material.value = materialController.text.trim();
     final filament = KaufFilamentModel(
       filamentId: editingId.value ?? uuid.v4(),
       marke: markeController.text.trim(),
@@ -152,7 +217,7 @@ class HomeController extends GetxController {
     kaufdatum.value = filament.kaufdatum;
     markeController.text = filament.marke;
     haendlerController.text = filament.haendler;
-    material.value = filament.material;
+    selectMaterial(filament.material);
     preisController.text = filament.preis.toStringAsFixed(2);
     farbeController.text = filament.farbe;
     gewichtController.text = filament.gewichtGramm == null
@@ -185,15 +250,16 @@ class HomeController extends GetxController {
   }
 
   void resetForm() {
+    formKey.currentState?.reset();
     editingId.value = null;
     haendlerController.clear();
     markeController.clear();
     farbeController.clear();
     preisController.clear();
     kaufdatum.value = DateTime.now();
-    material.value = 'PLA';
+    selectMaterial(materialien.firstOrNull ?? '');
+    materialMessage.value = null;
     gewichtController.clear();
-    formKey.currentState?.reset();
   }
 
   @override
@@ -205,6 +271,7 @@ class HomeController extends GetxController {
     farbeController.dispose();
     preisController.dispose();
     gewichtController.dispose();
+    materialController.dispose();
     super.onClose();
   }
 }