Add Inventory system with Inventory, InventorySlot, and StatModifierItem classes; update character attributes to include level and experience

Assets/Scripts/Systems/InventoryManager.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Linq;
+using Inventory;
+using KBCore.Refs;
+using UnityEngine;
+using Weapons;
+
+namespace Systems
+{
+    public class InventoryManager : MonoBehaviour
+    {
+        [SerializeField, Self] private Inventory.Inventory inventory;
+        [SerializeField, Self] private CharacterModifierManager characterModifierManager;
+        [SerializeField, Self] private CharacterWeaponsManager characterWeaponsManager;
+
+        private void Start()
+        {
+            if (inventory == null)
+            {
+                Debug.LogError("Inventory is not assigned in InventoryManager.");
+                return;
+            }
+
+            if (characterModifierManager == null)
+            {
+                Debug.LogError("CharacterModifierManager is not assigned in InventoryManager.");
+                return;
+            }
+
+            if (characterWeaponsManager == null)
+            {
+                Debug.LogError("CharacterWeaponsManager is not assigned in InventoryManager.");
+                return;
+            }
+
+            EquipAllItems();
+            EquipAllWeapons();
+        }
+
+        public void EquipItem(StatModifierItem item)
+        {
+            inventory.AddItem(item);
+            foreach (var cure in item.cures) characterModifierManager.EquipItem(cure);
+            foreach (var curse in item.curses) characterModifierManager.EquipItem(curse);
+        }
+
+        public void UnequipItem(StatModifierItem item)
+        {
+            if (inventory.ItemSlots.All(slot => slot.item != item)) return;
+            inventory.RemoveItem(item);
+            
+            foreach (var cure in item.cures) characterModifierManager.UnequipItem(cure);
+            foreach (var curse in item.curses) characterModifierManager.UnequipItem(curse);
+        }
+
+        public void EquipWeapon(WeaponItem weaponItem)
+        {
+            inventory.AddWeapon(weaponItem);
+            characterWeaponsManager.EquipWeapon(weaponItem.prefab);
+        }
+        
+        public void UnequipWeapon(WeaponItem weaponItem)
+        {
+            if (inventory.WeaponSlots.All(slot => slot.item != weaponItem)) return;
+            inventory.RemoveWeapon(weaponItem);
+            weaponItem.prefab.TryGetComponent(out Weapon weapon);
+            characterWeaponsManager.UnequipWeapon(weapon);
+        }
+        
+        private void EquipAllWeapons()
+        {
+            foreach (var slot in inventory.WeaponSlots)
+            {
+               EquipWeapon(slot.item as WeaponItem);
+            }
+        }
+        
+        private void EquipAllItems()
+        {
+            foreach (var slot in inventory.ItemSlots)
+            {
+                EquipItem(slot.item as StatModifierItem);
+            }
+        }
+    }
+}