Refactor logged-in and out messaging, Prepare Catering Module with shopping cart

src/ez_lan_manager/services/CateringService.py

@@ -19,6 +19,16 @@ class CateringService:
         self._db_service = db_service
         self._accounting_service = accounting_service
         self._user_service = user_service
+        self.cached_cart: dict[int, list[CateringMenuItem]] = {  # REMOVE
+            27: [
+                CateringMenuItem(1, "Bockwurst", 150, CateringMenuItemCategory.SNACK),
+                CateringMenuItem(2, "Pils", 120, CateringMenuItemCategory.SNACK),
+                CateringMenuItem(3, "Pfezzi", 200, CateringMenuItemCategory.SNACK),
+                CateringMenuItem(3, "Pfezzi", 200, CateringMenuItemCategory.SNACK),
+                CateringMenuItem(4, "Pizza", 1150, CateringMenuItemCategory.MAIN_COURSE),
+                CateringMenuItem(5, "Zigaretten", 800, CateringMenuItemCategory.NON_FOOD),
+            ]
+        }
 
     # ORDERS
 
@@ -110,3 +120,17 @@ class CateringService:
     def enable_menu_items_by_category(self, category: CateringMenuItemCategory) -> bool:
         items = self.get_menu(category=category)
         return all([self.enable_menu_item(item.item_id) for item in items])
+
+    # CART
+
+    def save_cart(self, user_id: Optional[int], cart: list[CateringMenuItem]) -> None:
+        if user_id:
+            self.cached_cart[user_id] = cart
+
+    def get_cart(self, user_id: Optional[int]) -> list[CateringMenuItem]:
+        if user_id is None:
+            return []
+        try:
+            return self.cached_cart[user_id]
+        except KeyError:
+            return []