Animals can now be bought in AnimalShop

if bought they will be placed somewhere random on the map

Assets/Scripts/Shop/ItemShop.cs

@@ -0,0 +1,53 @@
+using UnityEngine;
+
+namespace Shop {
+
+
+    public class ItemShop : ElementStorage<Item> {
+        #region Singleton
+
+        public static ItemShop instance;
+
+        private void Awake() {
+            if(instance != null) {
+                Debug.LogWarning("More than one instance of ItemShop found");
+            }
+
+            instance = this;
+        }
+
+        #endregion
+
+        public bool itemWasBought;
+
+        private PlayerController _playerController;
+        private Inventory _inventory;
+        private Item _lastBoughtItem;
+        private int _lastBoughtItemAmount;
+
+        /**
+     * Calls ElementStorage.RemoveItem() and sets 2 Variables to remember the last bought item
+     */
+        public override void RemoveElement(Item item, int amount) {
+            base.RemoveElement(item, amount);
+            if(itemWasBought) {
+                _lastBoughtItem = item;
+                _lastBoughtItemAmount = amount;
+            }
+        }
+
+        public void UndoLastPurchase() {
+            if(itemWasBought) {
+                _inventory = Inventory.instance;
+                _playerController = PlayerController.instance;
+
+                if(_lastBoughtItem) {
+                    _playerController.ChangeMoney(_lastBoughtItem.price);
+                    _inventory.RemoveElement(_lastBoughtItem, _lastBoughtItemAmount);
+                    AddElement(_lastBoughtItem, _lastBoughtItemAmount);
+                    itemWasBought = false;
+                }
+            }
+        }
+    }
+}