first commit

Assets/_Scripts/Inventory.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using UnityEngine;
+
+[Serializable]
+public class InventorySlot
+{
+    public ItemData item;
+    public int amount;
+
+    public InventorySlot(ItemData item, int amount)
+    {
+        this.item = item;
+        this.amount = Mathf.Max(0, amount);
+    }
+}
+
+public class Inventory : MonoBehaviour
+{
+    [SerializeField] private List<InventorySlot> slots = new List<InventorySlot>();
+
+    public event Action OnInventoryChanged;
+
+    public IReadOnlyList<InventorySlot> Slots => slots;
+
+    public bool HasItem(ItemData item, int amount)
+    {
+        if (item == null)
+            return true;
+
+        return GetAmount(item) >= Mathf.Max(1, amount);
+    }
+
+    public int GetAmount(ItemData item)
+    {
+        if (item == null)
+            return 0;
+
+        InventorySlot slot = FindSlot(item);
+        return slot != null ? Mathf.Max(0, slot.amount) : 0;
+    }
+
+    public bool AddItem(ItemData item, int amount)
+    {
+        if (item == null || amount <= 0)
+            return false;
+
+        InventorySlot slot = FindSlot(item);
+        int maxStack = Mathf.Max(1, item.maxStack);
+
+        if (slot == null)
+        {
+            slots.Add(new InventorySlot(item, Mathf.Min(amount, maxStack)));
+            RaiseChanged();
+            return true;
+        }
+
+        int newAmount = Mathf.Clamp(slot.amount + amount, 0, maxStack);
+        if (newAmount == slot.amount)
+            return false;
+
+        slot.amount = newAmount;
+        RaiseChanged();
+        return true;
+    }
+
+    public bool RemoveItem(ItemData item, int amount)
+    {
+        if (item == null || amount <= 0)
+            return false;
+
+        InventorySlot slot = FindSlot(item);
+        if (slot == null || slot.amount < amount)
+            return false;
+
+        slot.amount -= amount;
+        if (slot.amount <= 0)
+            slots.Remove(slot);
+
+        RaiseChanged();
+        return true;
+    }
+
+    public string GetDebugText()
+    {
+        if (slots.Count == 0)
+            return "Инвентарь: пусто";
+
+        StringBuilder builder = new StringBuilder("Инвентарь: ");
+        bool first = true;
+
+        foreach (InventorySlot slot in slots)
+        {
+            if (slot == null || slot.item == null || slot.amount <= 0)
+                continue;
+
+            if (!first)
+                builder.Append(", ");
+
+            builder.Append(slot.item.itemName);
+            builder.Append(" x");
+            builder.Append(slot.amount);
+            first = false;
+        }
+
+        return first ? "Инвентарь: пусто" : builder.ToString();
+    }
+
+    private InventorySlot FindSlot(ItemData item)
+    {
+        return slots.Find(slot => slot != null && slot.item == item);
+    }
+
+    private void RaiseChanged()
+    {
+        OnInventoryChanged?.Invoke();
+    }
+}