Add Shop system with ShopManager, ShopUI, and ShopSlotUI; implement item purchasing and shop UI functionality

Assets/Scenes/main.unity

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@@ -726,6 +854,7 @@ MonoBehaviour:
     armor: 0
     level: 1
     experience: 0
+    baseExperienceToLevelUp: 100
     damage: 1
     rangedDamage: 1
     meleeDamage: 1
@@ -1056,6 +1185,7 @@ MonoBehaviour:
     armor: 0
     level: 1
     experience: 0
+    baseExperienceToLevelUp: 100
     damage: 1
     rangedDamage: 1
     meleeDamage: 1
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Assets/Scripts/Data/CharacterAttributes.cs

@@ -28,6 +28,7 @@ namespace Data
         [OdinSerialize] public float armor = 0f;
         [OdinSerialize] public int level = 1;
         [OdinSerialize] public int experience = 0;
+        [OdinSerialize] public int baseExperienceToLevelUp = 100;
 
         [OdinSerialize, PropertyTooltip("This is damage multiplier")]
         public float damage = 1f;
@@ -54,6 +55,7 @@ namespace Data
         
         public event Action<int> OnExperienceChanged;
         public event Action<int> OnLevelChanged;
+        public event Action OnLevelUp;
 
         public float Health
         {
@@ -174,7 +176,15 @@ namespace Data
                 experience = value;
                 OnExperienceChanged?.Invoke(experience);
                 
-                //TODO: Implement level up logic
+                if (experience >= ExperienceToNextLevel())
+                {
+                    Level++;
+                    experience -= ExperienceToNextLevel();
+                }
+                else if (experience < 0)
+                {
+                    experience = 0;
+                }
             }
         }
         
@@ -186,6 +196,7 @@ namespace Data
                 if (level == value) return;
                 level = value;
                 OnLevelChanged?.Invoke(level);
+                OnLevelUp?.Invoke();
             }
         }
 
@@ -327,5 +338,10 @@ namespace Data
             Level = 1;
             Experience = 0;
         }
+
+        private int ExperienceToNextLevel()
+        {
+            return (int)(baseExperienceToLevelUp * Math.Pow(Level, 2));
+        }
     }
 }

Assets/Scripts/Inventory/StatModifierItem.cs

@@ -12,8 +12,31 @@ namespace Inventory
         public string itemName;
         [TextArea] public string description;
         public Sprite icon;
+        public int price;
         
         public List<IStatModifier> cures = new();
         public List<IStatModifier> curses = new();
+        
+        [Button("Build Description")]
+        private void BuildDescription()
+        {
+            var descriptionBuilder = new System.Text.StringBuilder();
+            foreach (var modifier in cures)
+            {
+                if (descriptionBuilder.Length > 0) descriptionBuilder.Append(", ");
+                
+                var desc = $"Cure: {modifier.Description}";
+                descriptionBuilder.Append(desc);
+            }
+            
+            foreach (var modifier in curses)
+            {
+                if (descriptionBuilder.Length > 0) descriptionBuilder.Append(", ");
+                var desc = $"Curse: {modifier.Description}";
+                descriptionBuilder.Append(desc);
+            }
+            
+            description = descriptionBuilder.ToString();
+        }
     }
 }

Assets/Scripts/Inventory/WeaponItem.cs

@@ -10,5 +10,6 @@ namespace Inventory
         [OdinSerialize, TextArea] public string description;
         [OdinSerialize] public GameObject prefab;
         [OdinSerialize] public Sprite icon;
+        [OdinSerialize] public int price;
     }
 }

Assets/Scripts/Modifiers/PercentStatModifier.cs

@@ -11,7 +11,7 @@ namespace Modifiers
 
         public Stat stat;
         public float percent;
-        public string Description => $"{stat} +{percent * 100}%";
+        public string Description => GetDescription();
 
         public void Apply(CharacterAttributes attributes)
         {
@@ -55,5 +55,11 @@ namespace Modifiers
                 _ => throw new System.ArgumentOutOfRangeException()
             };
         }
+        
+        private string GetDescription()
+        {
+            var sign = percent >= 0 ? "+" : "";
+            return $"{stat} {sign}{percent * 100}%";
+        }
     }
 }

Assets/Scripts/Shop.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: b873cfd693194508ae2ef2947a6c42fd
+timeCreated: 1752272703

Assets/Scripts/Shop/ShopManager.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using Inventory;
+using Sirenix.Serialization;
+using Systems;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+namespace Shop
+{
+    public class ShopManager : MonoBehaviour
+    {
+        private List<StatModifierItem> currentItemChoices = new();
+        private List<WeaponItem> currentWeaponChoices = new();
+        
+        [SerializeField] private ShopUI shopUI;
+        [SerializeField] private InventoryManager inventoryManager;
+
+        [SerializeField] private int itemsPerShop = 4;
+        [OdinSerialize, SerializeField] private List<StatModifierItem> possibleItems = new();
+        [OdinSerialize, SerializeField] private List<WeaponItem> possibleWeapons = new();
+
+        private void OnEnable()
+        {
+            // GameManager.Instance.OnRoundEnd += OpenShop;
+            GameManager.Instance.OnStoreOpen += OpenShop;
+        }
+
+        private void OnDisable()
+        {
+            // GameManager.Instance.OnRoundEnd -= OpenShop;
+            GameManager.Instance.OnStoreOpen -= OpenShop;
+        }
+
+        public void CloseShop()
+        {
+            shopUI.Hide();
+            Time.timeScale = 1f;
+        }
+
+        public void BuyItem(StatModifierItem item, int price)
+        {
+            if (GameManager.Instance.Coins < price) return;
+            
+            GameManager.Instance.SpendCoins(price);
+            inventoryManager.EquipItem(item);
+            shopUI.MarkAsPurchased(item);
+        }
+        
+        public void BuyWeapon(WeaponItem weapon, int price)
+        {
+            if (GameManager.Instance.Coins < price) return;
+            
+            GameManager.Instance.SpendCoins(price);
+            inventoryManager.EquipWeapon(weapon);
+            shopUI.MarkAsPurchased(weapon);
+        }
+        
+        public void RerollShop()
+        {
+            currentItemChoices = DrawRandomItems(possibleItems, itemsPerShop);
+            currentWeaponChoices = DrawRandomItems(possibleWeapons, itemsPerShop);
+            
+            shopUI.Show(currentItemChoices, currentWeaponChoices, this);
+        }
+        
+        private void OpenShop()
+        {
+            OpenShop(GameManager.Instance.CurrentRound);
+        }
+
+        private void OpenShop(int round)
+        {
+            currentItemChoices = DrawRandomItems(possibleItems, itemsPerShop);
+            currentWeaponChoices = DrawRandomItems(possibleWeapons, itemsPerShop);
+            
+            shopUI.Show(currentItemChoices, currentWeaponChoices, this);
+            Time.timeScale = 0f;
+        }
+
+        private List<T> DrawRandomItems<T>(List<T> pool, int count)
+        {
+            var result = new List<T>();
+            var poolCopy = new List<T>(pool);
+
+            for (var i = 0; i < count && poolCopy.Count > 0; i++)
+            {
+                var idx = Random.Range(0, poolCopy.Count);
+                result.Add(poolCopy[idx]);
+                poolCopy.RemoveAt(idx);
+            }
+            
+            return result;
+        }
+    }
+}

Assets/Scripts/Shop/ShopManager.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 3f37c728615643a1abc988bbfd34986c
+timeCreated: 1752272671

Assets/Scripts/Shop/ShopSlotUI.cs

@@ -0,0 +1,56 @@
+using Inventory;
+using Systems;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Shop
+{
+    public class ShopSlotUI : MonoBehaviour
+    {
+        private ScriptableObject item;
+        private ShopManager shopManager;
+        private int price;
+        
+        [SerializeField] private Image icon;
+        [SerializeField] private TextMeshProUGUI nameText;
+        [SerializeField] private TextMeshProUGUI descriptionText;
+        [SerializeField] private TextMeshProUGUI priceText;
+        [SerializeField] private Button purchaseButton;
+        
+        public void Setup(StatModifierItem item, ShopManager manager)
+        {
+            this.item = item;
+            shopManager = manager;
+            price = item.price;
+
+            icon.sprite = item.icon;
+            nameText.text = item.name;
+            descriptionText.text = item.description;
+            priceText.text = $"Price: {price}";
+
+            purchaseButton.interactable = GameManager.Instance.Coins >= price;
+            purchaseButton.onClick.AddListener(() => shopManager.BuyItem(item, price));
+        }
+        
+        public void Setup(WeaponItem weapon, ShopManager manager)
+        {
+            item = weapon;
+            shopManager = manager;
+            price = weapon.price;
+            icon.sprite = weapon.icon;
+            nameText.text = weapon.weaponName;
+            descriptionText.text = weapon.description;
+            priceText.text = $"Price: {price}";
+            purchaseButton.interactable = GameManager.Instance.Coins >= price;
+            purchaseButton.onClick.AddListener(() => shopManager.BuyWeapon(weapon, price));
+        }
+
+        public bool MatchesItem(ScriptableObject item) => this.item == item;
+
+        public void MarkAsPurchased()
+        {
+            purchaseButton.interactable = false;
+        }
+    }
+}

Assets/Scripts/Shop/ShopSlotUI.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1d76cc9c15ed441b930dbe52e5e9af5f
+timeCreated: 1752273703

Assets/Scripts/Shop/ShopUI.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using Inventory;
+using Systems;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Shop
+{
+    public class ShopUI : MonoBehaviour
+    {
+        [SerializeField] private GameObject shopPanel;
+        [SerializeField] private Transform itemSlotParent;
+        [SerializeField] private Transform weaponSlotParent;
+        [SerializeField] private ShopSlotUI slotPrefab;
+        [SerializeField] private TextMeshProUGUI roundsText;
+        
+        private List<ShopSlotUI> currentSlots = new();
+
+        private void OnEnable()
+        {
+            GameManager.Instance.OnRoundEnd += UpdateRoundText;
+        }
+        
+        private void OnDisable()
+        {
+            GameManager.Instance.OnRoundEnd -= UpdateRoundText;
+        }
+
+        public void Show(List<StatModifierItem> items, List<WeaponItem> weapons, ShopManager shopManager)
+        {
+            GameManager.Instance.StoreIsClosed = false;
+            UpdateRoundText(GameManager.Instance.CurrentRound);
+            
+            shopPanel.SetActive(true);
+            ClearSlots();
+
+            foreach (var item in items)
+            {
+                var slot = Instantiate(slotPrefab, itemSlotParent);
+                slot.Setup(item, shopManager);
+                currentSlots.Add(slot);
+            }
+            
+            foreach (var weapon in weapons)
+            {
+                var slot = Instantiate(slotPrefab, weaponSlotParent);
+                slot.Setup(weapon, shopManager);
+                currentSlots.Add(slot);
+            }
+        }
+
+        public void Hide()
+        {
+            GameManager.Instance.StoreIsClosed = true;
+            shopPanel.SetActive(false);
+            ClearSlots();
+        }
+
+        public void MarkAsPurchased(ScriptableObject item)
+        {
+            foreach (var slot in currentSlots)
+            {
+                if (slot.MatchesItem(item)) slot.MarkAsPurchased();
+            }
+        }
+        
+        private void ClearSlots()
+        {
+            foreach (var slot in currentSlots) Destroy(slot.gameObject);
+            
+            currentSlots.Clear();
+        }
+        
+        private void UpdateRoundText(int round)
+        {
+            var nextRound = Mathf.Min(round + 1, GameManager.Instance.MaxRounds);
+            roundsText.text = $"Round: {nextRound}/{GameManager.Instance.MaxRounds}";
+        }
+
+    }
+}

Assets/Scripts/Shop/ShopUI.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: abe11e705b4f47feb25a4e4845d1e6e9
+timeCreated: 1752272723

Assets/Scripts/Systems/EnemyDeathBehavior.cs

@@ -1,15 +1,21 @@
 using Interfaces;
+using Sirenix.Serialization;
 using UnityEngine;
 
 namespace Systems
 {
     public class EnemyDeathBehavior : MonoBehaviour, IDeathBehavior
     {
+        [OdinSerialize, SerializeField] private int expReward = 5;
+        [OdinSerialize, SerializeField] private int coinReward = 1;
+        
         public void Die()
         {
+            GameManager.Instance.Player.attributes.ModifyExperience(expReward);
+            GameManager.Instance.AddCoins(coinReward);
             Destroy(gameObject);
+            
             // later let's add particle effects, sound effects, etc.
-            // and give player experience points
         }
     }
 }

Assets/Scripts/Systems/GameManager.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections;
+using Data;
+using Sirenix.Serialization;
+using UnityEngine;
+
+namespace Systems
+{
+    public class GameManager : MonoBehaviour
+    {
+        private float timer;
+        
+        public static GameManager Instance { get; private set; }
+
+        [OdinSerialize, SerializeField] private int currentRound = 1;
+        [OdinSerialize, SerializeField] private int coins = 0;
+        [OdinSerialize, SerializeField] private float roundTime = 60f;
+        [OdinSerialize, SerializeField] private int maxRounds = 20;
+        
+        [OdinSerialize, SerializeField] private Character player;
+        
+        public Character Player => player;
+        public int Coins => coins;
+        public int CurrentRound => currentRound;
+        public float RoundTime => roundTime;
+        public int MaxRounds => maxRounds;
+        public bool StoreIsClosed { get; set; } = true;
+
+        public event Action<int> OnRoundStart;
+        public event Action<int> OnRoundEnd;
+        public event Action OnStoreOpen;
+        
+
+        private void Awake()
+        {
+            if (Instance == null)
+            {
+                Instance = this;
+                DontDestroyOnLoad(gameObject);
+            }
+            else
+            {
+                Destroy(gameObject);
+            }
+        }
+
+        private void Start()
+        {
+            StartCoroutine(RoundLoop());
+        }
+
+        private IEnumerator RoundLoop()
+        {
+            OnStoreOpen?.Invoke();
+            yield return new WaitUntil(() => StoreIsClosed);
+            
+            for (currentRound = 1; currentRound <= maxRounds; currentRound++)
+            {
+                OnRoundStart?.Invoke(currentRound);
+                timer = roundTime;
+
+                while (timer > 0)
+                {
+                    timer -= Time.deltaTime;
+                    yield return null;
+                }
+
+                OnRoundEnd?.Invoke(currentRound);
+                StoreIsClosed = false;
+                OnStoreOpen?.Invoke();
+                yield return new WaitUntil(() => StoreIsClosed);
+            }
+        }
+        
+        public void AddCoins(int amount)
+        {
+            coins += amount;
+        }
+        
+        public void SpendCoins(int amount)
+        {
+            if (coins >= amount)
+            {
+                coins -= amount;
+            }
+        }
+    }
+}

Assets/Scripts/Systems/GameManager.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 41ea29e7d7d04eb5be628e56520e9bbd
+timeCreated: 1752271597