first commit structure of app

lib/services/get_storage_services.dart

@@ -0,0 +1,91 @@
+import 'package:get/get.dart';
+import 'package:get_storage/get_storage.dart';
+
+class GetStorageService extends GetxService {
+  final GetStorage _box = GetStorage();
+
+  // CREATE / UPDATE
+  Future<void> save<T>(String key, T value) async {
+    await _box.write(key, value);
+  }
+
+  // READ
+  T? get<T>(String key) {
+    return _box.read<T>(key);
+  }
+
+  // READ mit Defaultwert
+  T getOrDefault<T>(String key, T defaultValue) {
+    return get<T>(key) ?? defaultValue;
+  }
+
+  // DELETE
+  Future<void> delete(String key) async {
+    await _box.remove(key);
+  }
+
+  // EXISTS
+  bool exists(String key) {
+    return _box.hasData(key);
+  }
+
+  // CLEAR ALL
+  Future<void> clear() async {
+    await _box.erase();
+  }
+
+  // READ LIST
+  List<T> getList<T>(String key) {
+    final data = _box.read<List<dynamic>>(key);
+    return data?.cast<T>() ?? <T>[];
+  }
+
+  // SAVE LIST
+  Future<void> saveList<T>(String key, List<T> items) async {
+    await _box.write(key, items);
+  }
+
+  // ADD ITEM
+  Future<void> addItem<T>(String key, T item) async {
+    final items = getList<T>(key);
+    items.add(item);
+    await saveList<T>(key, items);
+  }
+
+  // UPDATE ITEM
+  Future<void> updateItem<T>(String key, int index, T item) async {
+    final items = getList<T>(key);
+
+    if (index < 0 || index >= items.length) {
+      throw RangeError.index(index, items);
+    }
+
+    items[index] = item;
+    await saveList<T>(key, items);
+  }
+
+  // DELETE ITEM
+  Future<void> deleteItem<T>(String key, int index) async {
+    final items = getList<T>(key);
+
+    if (index < 0 || index >= items.length) {
+      throw RangeError.index(index, items);
+    }
+
+    items.removeAt(index);
+    await saveList<T>(key, items);
+  }
+
+  Future<void> saveModelList(
+    String key,
+    List<Map<String, dynamic>> items,
+  ) async {
+    await _box.write(key, items);
+  }
+
+  List<Map<String, dynamic>> getModelList(String key) {
+    final data = _box.read<List<dynamic>>(key) ?? [];
+
+    return data.map((item) => Map<String, dynamic>.from(item as Map)).toList();
+  }
+}