you can now undo a purchase after buying an item from the shop

Assets/Scenes/MainScene.unity

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@@ -849,7 +984,7 @@ RectTransform:
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@@ -1505,7 +1640,7 @@ MonoBehaviour:
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@@ -1536,7 +1671,7 @@ MonoBehaviour:
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@@ -6320,8 +6456,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   itemsParent: {fileID: 610140154}
   shopUI: {fileID: 1671356616}
-  shopIsOpen: 0
+  inventoryUI: {fileID: 971652020}
-  inventoryUI: {fileID: 1609015285}
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   - {fileID: 11400000, guid: 008a8fdd2c3a95745acafee4087a855d, type: 2}
+  itemWasSold: 0
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Assets/Scripts/InventorySlot.cs

@@ -5,11 +5,13 @@ public class InventorySlot : ItemStorageSlot {
      * Gets called when the Inventory Slot is clicked
      */
     public override void UseItem() {
+        if(Item){
             if(Item.GetType() == typeof(UsableItem)) {
-            ((UsableItem) Item).Select();
+                ((UsableItem)Item).Select();
                 Debug.Log("using " + Item.displayName);
             } else {
                 Debug.Log("Item not usable " + Item.displayName);
             }
         }
+    }
 }

Assets/Scripts/InventoryUI.cs

@@ -40,12 +40,13 @@ public class InventoryUI : MonoBehaviour {
      * Is called when something in the Inventory UI should update
      */
     private void UpdateUI() {
-        // Add all items to the correct slots and clear the ones where no item should be
+        // Add all items to the correct slots, clear the ones where no item should be and set the number of how many items are in the slot
         for(int i = 0; i < _slots.Length; i++) {
             if(i < _inventory.items.Count) {
                 _slots[i].AddItem(_inventory.items.ElementAt(i).Key);
-                if(_inventory.items[_inventory.items.ElementAt(i).Key] > 1) {
                 _slots[i].amountText.text = "" + _inventory.items[_inventory.items.ElementAt(i).Key];
+                if(_inventory.items[_inventory.items.ElementAt(i).Key] == 1) {
+                    _slots[i].amountText.text = "";
                 }
             } else {
                 _slots[i].ClearSlot();

Assets/Scripts/Item.cs

@@ -9,6 +9,7 @@ public class Item : ScriptableObject, IComparable<Item> {
     public Sprite selectedSprite;
     public Sprite defaultSprite;
     public int cost;
+    public int SellPrice => Convert.ToInt32(cost * 0.8);
     
     public Item(string displayName, string description, int id) {
         this.displayName = displayName;

Assets/Scripts/ItemStorage.cs

@@ -34,7 +34,7 @@ public class ItemStorage : MonoBehaviour {
     /**
      * Removes the specified amount of items in the Item Storage
      */
-    public void RemoveItem(Item item, int amount) {
+    public virtual void RemoveItem(Item item, int amount) {
         if(items[item]-amount <= 0) {
             items.Remove(item);
         } else {

Assets/Scripts/PlayerController.cs

@@ -30,11 +30,15 @@ public class PlayerController : MonoBehaviour {
 
     public int Money => _money;
 
+    public delegate void OnMoneyChanged();
+    public OnMoneyChanged onMoneyChangedCallback;
+    
     // Start is called before the first frame update
     private void Start() {
         _money = startMoney;
         _inventory = Inventory.instance;
-        moneyTextMeshProUGUI.text = _money + "µ";
+
+        onMoneyChangedCallback += UpdateMoneyUI;
     }
 
     public void SetSelectedItem(UsableItem item) {
@@ -52,6 +56,10 @@ public class PlayerController : MonoBehaviour {
 
     public void ChangeMoney(int amount) {
         _money += amount;
+        onMoneyChangedCallback?.Invoke();
+    }
+
+    private void UpdateMoneyUI() {
         moneyTextMeshProUGUI.text = _money + "µ";
     }
 }

Assets/Scripts/Shop.cs

@@ -14,4 +14,36 @@ public class Shop : ItemStorage {
     }
 
     #endregion
+    
+    public bool itemWasBought;
+    
+    private PlayerController _playerController;
+    private Inventory _inventory;
+    private Item _lastBoughtItem;
+    private int _lastBoughtItemAmount;
+
+    /**
+     * Calls ItemStorage.RemoveItem() and sets 2 Variables to remember the last bought item
+     */
+    public override void RemoveItem(Item item, int amount) {
+        base.RemoveItem(item, amount);
+        if(itemWasBought){
+            _lastBoughtItem = item;
+            _lastBoughtItemAmount = amount;
+        }
+    }
+    
+    public void UndoLastPurchase() {
+        if(itemWasBought){
+            _inventory = Inventory.instance;
+            _playerController = PlayerController.instance;
+
+            if(_lastBoughtItem) {
+                _playerController.ChangeMoney(_lastBoughtItem.cost);
+                _inventory.RemoveItem(_lastBoughtItem, _lastBoughtItemAmount);
+                AddItem(_lastBoughtItem, _lastBoughtItemAmount);
+                itemWasBought = false;
+            }
+        }
+    }
 }

Assets/Scripts/ShopSlot.cs

@@ -32,13 +32,14 @@ public class ShopSlot : ItemStorageSlot {
     public override void UseItem() {
         if(Item) {
             if(_playerController.Money >= Item.cost) {
-                _inventory.AddItem(Item, 1);
-                _shop.RemoveItem(Item, 1);
                 if(Item) {
                     _playerController.ChangeMoney(-Item.cost);
+                    _shop.itemWasBought = true;
                     
                     Debug.Log("Buying Item: " + Item.displayName);
                 }
+                _inventory.AddItem(Item, 1);
+                _shop.RemoveItem(Item, 1);
             } else {
                 Debug.Log("Not enough money to buy item.");
             }

Assets/Scripts/ShopUI.cs

@@ -4,7 +4,6 @@ using UnityEngine;
 public class ShopUI : MonoBehaviour {
     public Transform itemsParent;
     public GameObject shopUI;
-    public bool shopIsOpen;
     public GameObject inventoryUI;
 
     private Shop _shop;
@@ -17,7 +16,6 @@ public class ShopUI : MonoBehaviour {
 
         // Add all ShopSlot GameObjects to _slots and turn off the Shop UI
         _slots = itemsParent.GetComponentsInChildren<ShopSlot>();
-        shopIsOpen = false;
         ToggleShop();
 
         // Set the icon to not be a raycast target for the Description Hovering to work
@@ -29,7 +27,6 @@ public class ShopUI : MonoBehaviour {
     private void Update() {
         // When "Shop" button is pressed turn on/off Shop UI
         if (Input.GetButtonDown("Shop")) {
-            shopIsOpen = true;
             ToggleShop();
         }
     }
@@ -38,7 +35,7 @@ public class ShopUI : MonoBehaviour {
      * Turn on/off the Shop UI
      */
     private void ToggleShop() {
-        inventoryUI.gameObject.SetActive(!shopUI.activeSelf);
+        // TODO: geht ned oda so: inventoryUI.gameObject.SetActive(!shopUI.activeSelf);
         shopUI.SetActive(!shopUI.activeSelf);
     }
 

Assets/Scripts/TileBehaviour.cs

@@ -2,14 +2,12 @@ using System;
 using Tiles;
 using UnityEngine;
 
-public class TileBehaviour : MonoBehaviour
+public class TileBehaviour : MonoBehaviour {
-{
     private BaseTile _tile;
     private SpriteRenderer _hoverIndicatorSpriteRenderer;
 
     // Start is called before the first frame update
-    void Start()
+    void Start() {
-    {
         //_hoverIndicatorSpriteRenderer = gameObject.transform.GetChild(0).GetComponent<SpriteRenderer>();
         //SetHoverIndicatorVisibility(false);
         SetTile(new GrassTile());
@@ -17,32 +15,22 @@ public class TileBehaviour : MonoBehaviour
         HouseController.NewDayEvent.AddListener(_tile.DayLightStep);
     }
 
-    // Update is called once per frame
+    void OnMouseDown() {
-    void Update()
-    {
-        
-    }
-    
-    void OnMouseDown()
-    {
         UsableItem usable = null;
         BaseTile tileToSetTo = null;
 
-        if (PlayerController.instance.GetSelectedItem() != null)
+        if(PlayerController.instance.GetSelectedItem() != null) {
-        {
             usable = PlayerController.instance.GetSelectedItem();
         }
 
         tileToSetTo = _tile.Clicked(usable);
 
-        if (tileToSetTo != null)
+        if(tileToSetTo != null) {
-        {
             SetTile(tileToSetTo);
         }
     }
 
-    void SetTile(BaseTile tileToSet)
+    void SetTile(BaseTile tileToSet) {
-    {
         _tile = tileToSet;
         GetComponent<SpriteRenderer>().sprite = _tile.Sprite;
     }

Packages/packages-lock.json

@@ -137,12 +137,21 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.nuget.newtonsoft-json": {
+      "version": "3.0.2",
+      "depth": 2,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
     "com.unity.services.core": {
-      "version": "1.0.1",
+      "version": "1.3.1",
       "depth": 1,
       "source": "registry",
       "dependencies": {
-        "com.unity.modules.unitywebrequest": "1.0.0"
+        "com.unity.modules.unitywebrequest": "1.0.0",
+        "com.unity.nuget.newtonsoft-json": "3.0.2",
+        "com.unity.modules.androidjni": "1.0.0"
       },
       "url": "https://packages.unity.com"
     },

ProjectSettings/ProjectVersion.txt

@@ -1,2 +1,2 @@
-m_EditorVersion: 2021.3.1f1
+m_EditorVersion: 2021.3.2f1
-m_EditorVersionWithRevision: 2021.3.1f1 (3b70a0754835)
+m_EditorVersionWithRevision: 2021.3.2f1 (d6360bedb9a0)