Add LevelUpHud and UpgradeManager components; implement upgrade selection UI and item management

Assets/Prefabs/UI/UpgradeItemSlot.prefab

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@@ -6981,7 +7041,7 @@ MonoBehaviour:
     armor: 0
     level: 1
     experience: 0
-    baseExperienceToLevelUp: 100
+    baseExperienceToLevelUp: 25
     damage: 49
     rangedDamage: 1
     meleeDamage: 1
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Assets/Scripts/Data/CharacterAttributes.cs

@@ -180,6 +180,7 @@ namespace Data
                 {
                     Level++;
                     experience -= ExperienceToNextLevel();
+                    experience = Math.Min(0, experience);
                 }
                 else if (experience < 0)
                 {

Assets/Scripts/Shop/ShopManager.cs

@@ -62,6 +62,10 @@ namespace Shop
             shopUI.Show(currentItemChoices, currentWeaponChoices, this);
         }
         
+        public List<StatModifierItem> DrawRandomItems(int count) => DrawRandomItems(possibleItems, count);
+        
+        public List<WeaponItem> DrawRandomWeapons(int count) => DrawRandomItems(possibleWeapons, count);
+        
         private void OpenShop()
         {
             OpenShop(GameManager.Instance.CurrentRound);

Assets/Scripts/Shop/ShopSlotUI.cs

@@ -51,6 +51,7 @@ namespace Shop
         public void MarkAsPurchased()
         {
             purchaseButton.interactable = false;
+            purchaseButton.GetComponentInChildren<TextMeshProUGUI>().text = "Purchased";
         }
     }
 }

Assets/Scripts/Systems/UpgradeManager.cs

@@ -0,0 +1,40 @@
+using Inventory;
+using UI;
+using UnityEngine;
+
+namespace Systems
+{
+    public class UpgradeManager : MonoBehaviour
+    {
+        private bool hasSelectedUpgrade;
+
+        [SerializeField] private InventoryManager inventoryManager;
+        [SerializeField] private LevelUpHud levelUpHud;
+
+        public bool HasSelectedUpgrade => hasSelectedUpgrade;
+        
+        public void SetHasSelectedUpgrade(bool value)
+        {
+            hasSelectedUpgrade = value;
+        }
+        
+        public void SelectUpgrade(StatModifierItem item)
+        {
+            if (hasSelectedUpgrade) return;
+
+            inventoryManager.EquipItem(item);
+            hasSelectedUpgrade = true;
+            levelUpHud.MarkAsSelected(item);
+
+        }
+
+        public void SelectUpgrade(WeaponItem weapon)
+        {
+            if (hasSelectedUpgrade) return;
+
+            inventoryManager.EquipWeapon(weapon);
+            hasSelectedUpgrade = true;
+            levelUpHud.MarkAsSelected(weapon);
+        }
+    }
+}

Assets/Scripts/Systems/UpgradeManager.cs.meta

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+guid: e88a6318368843c3b8e02ccad05b4569
+timeCreated: 1752334253

Assets/Scripts/UI/LevelUpHud.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Collections.Generic;
+using Inventory;
+using KBCore.Refs;
+using Shop;
+using Systems;
+using UnityEngine;
+
+namespace UI
+{
+    public class LevelUpHud : MonoBehaviour
+    {
+        private List<UpgradeSlot> currentSlots = new();
+        private List<StatModifierItem> currentItemChoices = new();
+        private List<WeaponItem> currentWeaponChoices = new(); 
+        
+        [SerializeField] private GameObject itemsContainer;
+        [SerializeField] private GameObject upgradeSlotPrefab;
+        [SerializeField] private int itemsCount = 3;
+        [SerializeField] private int weaponsCount = 2;
+        [SerializeField, Scene] private ShopManager shopManager;
+        [SerializeField, Scene] private UpgradeManager upgradeManager;
+
+        private void OnEnable()
+        {
+            Hide();
+            GameManager.Instance.Player.attributes.OnLevelUp += OnLevelUp;
+        }
+
+        private void OnDisable()
+        {
+            GameManager.Instance.Player.attributes.OnLevelUp -= OnLevelUp;
+        }
+        
+        private void OnLevelUp()
+        {
+            Show();
+        }
+
+        private void Show()
+        {
+            Time.timeScale = 0f;
+            ClearSlots();
+            
+            currentItemChoices = shopManager.DrawRandomItems(itemsCount);
+            currentWeaponChoices = shopManager.DrawRandomWeapons(weaponsCount);
+            
+            foreach (var item in currentItemChoices)
+            {
+                var slot = Instantiate(upgradeSlotPrefab, itemsContainer.transform);
+                if (slot.TryGetComponent(out UpgradeSlot upgradeSlot))
+                {
+                    upgradeSlot.Setup(item, upgradeManager);
+                    currentSlots.Add(upgradeSlot);
+                }
+            }
+            
+            foreach (var weapon in currentWeaponChoices)
+            {
+                var slot = Instantiate(upgradeSlotPrefab, itemsContainer.transform);
+                if (slot.TryGetComponent(out UpgradeSlot upgradeSlot))
+                {
+                    upgradeSlot.Setup(weapon, upgradeManager);
+                    currentSlots.Add(upgradeSlot);
+                }
+            }
+            
+            itemsContainer.SetActive(true);
+        }
+
+        private void Hide()
+        {
+            Time.timeScale = 1f;
+            itemsContainer.SetActive(false);
+            ClearSlots();
+        }
+        
+        private void ClearSlots()
+        {
+            foreach (Transform child in itemsContainer.transform) Destroy(child.gameObject);
+            
+            currentSlots.Clear();
+            currentItemChoices.Clear();
+            currentWeaponChoices.Clear();
+            upgradeManager.SetHasSelectedUpgrade(false);
+        }
+
+        public void MarkAsSelected(ScriptableObject item)
+        {
+            foreach (var slot in currentSlots)
+            {
+                if (slot.MatchesItem(item))
+                {
+                    slot.MarkAsSelected();
+                    Hide();
+                    return;
+                }
+            }
+        }
+    }
+}

Assets/Scripts/UI/LevelUpHud.cs.meta

@@ -0,0 +1,3 @@
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+guid: 47a2be3e3bc54f28a2b304237375b073
+timeCreated: 1752333303

Assets/Scripts/UI/UpgradeSlot.cs

@@ -0,0 +1,54 @@
+using Inventory;
+using Shop;
+using Systems;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace UI
+{
+    public class UpgradeSlot : MonoBehaviour
+    {
+        private UpgradeManager upgradeManager;
+        private ScriptableObject item;
+        
+        [SerializeField] private Image icon;
+        [SerializeField] private TextMeshProUGUI nameText;
+        [SerializeField] private TextMeshProUGUI descriptionText;
+        [SerializeField] private Button selectButton;
+        
+        public void Setup(StatModifierItem item, UpgradeManager manager)
+        {
+            this.item = item;
+            upgradeManager = manager;
+
+            icon.sprite = item.icon;
+            nameText.text = item.name;
+            descriptionText.text = item.description;
+            
+            selectButton.interactable = !upgradeManager.HasSelectedUpgrade;
+            selectButton.onClick.AddListener(() => upgradeManager.SelectUpgrade(item));
+        }
+        
+        public void Setup(WeaponItem weapon, UpgradeManager manager)
+        {
+            item = weapon;
+            upgradeManager = manager;
+            
+            icon.sprite = weapon.icon;
+            nameText.text = weapon.weaponName;
+            descriptionText.text = weapon.description;
+            
+            selectButton.interactable = !upgradeManager.HasSelectedUpgrade;
+            selectButton.onClick.AddListener(() => upgradeManager.SelectUpgrade(weapon));
+        }
+        
+        public bool MatchesItem(ScriptableObject item) => this.item == item;
+
+        public void MarkAsSelected()
+        {
+            selectButton.interactable = false;
+            selectButton.GetComponentInChildren<TextMeshProUGUI>().text = "Selected";
+        }
+    }
+}

Assets/Scripts/UI/UpgradeSlot.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 681d2399c12d499b900169ba083bdc62
+timeCreated: 1752333873