my-project/Assets/Inventory/Scripts/ItemGenerator.cs

using UnityEngine;
using System.Collections.Generic;

#if UNITY_EDITOR
using UnityEditor;
#endif

public class ItemGenerator : MonoBehaviour
{
    [Header("Item Template")]
    public string itemId = "";
    public string itemName = "";
    public string description = "";
    public ItemType itemType = ItemType.Material;
    public Sprite icon;
    public GameObject modelPrefab;
    public int maxStack = 64;
    public bool isCraftable;

    [Header("Crafting (if craftable)")]
    public string[] craftIngredients;
    public int[] craftAmounts;
    public string craftResultId;
    public int craftResultAmount = 1;

    public ItemData GenerateItemData()
    {
        if (string.IsNullOrEmpty(itemId))
        {
            itemId = System.Guid.NewGuid().ToString();
        }

        var itemData = ScriptableObject.CreateInstance<ItemData>();
        itemData.id = itemId;
        itemData.itemName = itemName;
        itemData.description = description;
        itemData.type = itemType;
        itemData.modelPrefab = modelPrefab;
        itemData.icon = icon;
        itemData.maxStack = maxStack;
        itemData.isCraftable = isCraftable;

        if (isCraftable && craftIngredients != null && craftIngredients.Length > 0)
        {
            itemData.craftingRecipe = new ItemData.CraftingRecipe
            {
                ingredients = craftIngredients,
                amounts = craftAmounts,
                resultId = craftResultId,
                resultAmount = craftResultAmount
            };
        }

        return itemData;
    }

    public static List<ItemData> GenerateAll(List<ItemGenerator> generators)
    {
        var items = new List<ItemData>();
        foreach (var generator in generators)
        {
            if (generator != null)
            {
                items.Add(generator.GenerateItemData());
            }
        }
        return items;
    }
}

/// <summary>
/// Предмет в мире - подбирается игроком
/// </summary>
public class WorldItem : MonoBehaviour
{
    public ItemData itemData;
    public int amount = 1;

    [Header("Settings")]
    public float pickupDelay = 0f;
    public bool useFactory = true;

    private bool _canPickup;

    public void Setup(ItemData data, int count)
    {
        itemData = data;
        amount = count;

        if (data.modelPrefab != null)
        {
            var model = Instantiate(data.modelPrefab, transform);
            model.transform.localPosition = Vector3.zero;
        }

        // Задержка перед подбором
        if (pickupDelay > 0)
            Invoke(nameof(EnablePickup), pickupDelay);
        else
            _canPickup = true;
    }

    private void EnablePickup() => _canPickup = true;

    void OnTriggerEnter(Collider other)
    {
        TryPickup(other);
    }

    void OnControllerColliderHit(ControllerColliderHit hit)
    {
        TryPickup(hit.controller);
    }

    /// <summary>
    /// Подобрать предмет вручную (по кнопке)
    /// </summary>
    public bool TryPickupByButton()
    {
        Debug.Log($"[TryPickup] _canPickup={_canPickup}, itemData={itemData?.itemName}, amount={amount}, Instance={InventoryManager.Instance != null}");

        if (!_canPickup)
        {
            Debug.LogWarning("[TryPickup] Cannot pickup - not ready yet");
            return false;
        }
        if (itemData == null)
        {
            Debug.LogWarning("[TryPickup] itemData is null!");
            return false;
        }
        if (InventoryManager.Instance == null)
        {
            Debug.LogWarning("[TryPickup] InventoryManager.Instance is null!");
            return false;
        }

        int remaining = InventoryManager.Instance.AddItem(itemData, amount);
        Debug.Log($"[TryPickup] AddItem returned remaining={remaining}");

        if (remaining <= 0)
        {
            Destroy(gameObject);
            return true;
        }
        else
        {
            amount = remaining;
            return false;
        }
    }

    void TryPickup(Collider other)
    {
        if (!_canPickup) return;
        if (other == null) return;
        if (!other.CompareTag("Player")) return;

        if (useFactory && InventoryItemFactory.Instance != null)
        {
            InventoryItemFactory.Instance.PickupItem(this, this);
        }
        else
        {
            // Fallback - старый способ
            int remaining = InventoryManager.Instance.AddItem(itemData, amount);
            if (remaining <= 0)
            {
                Destroy(gameObject);
            }
            else
            {
                amount = remaining;
            }
        }
    }

    /// <summary>
    /// Выбросить предмет с силой
    /// </summary>
    public void Throw(Vector3 velocity)
    {
        var rb = GetComponent<Rigidbody>();
        if (rb == null) rb = gameObject.AddComponent<Rigidbody>();
        rb.linearVelocity = velocity;
    }
}

/// <summary>
/// Точка спавна предмета
/// </summary>
public class ItemSpawner : MonoBehaviour
{
    public ItemData item;
    public int amount = 1;
    public float despawnTime = 300f;
    public bool spawnOnStart = false;
    public bool useFactory = true;

    public void Setup(ItemData itemData, int itemAmount, float despawn)
    {
        item = itemData;
        amount = itemAmount;
        despawnTime = despawn;
    }

    void Start()
    {
        if (spawnOnStart) Spawn();
    }

    public void Spawn()
    {
        if (useFactory && InventoryItemFactory.Instance != null)
        {
            var worldItem = InventoryItemFactory.Instance.CreateWorldItem(item, amount, transform.position);
            if (worldItem != null && despawnTime > 0)
            {
                Destroy(worldItem.gameObject, despawnTime);
            }
        }
        else
        {
            // Fallback - старый способ
            var prefab = Resources.Load<GameObject>("Prefabs/WorldItem");
            if (prefab != null)
            {
                var worldItem = Instantiate(prefab, transform.position, Quaternion.identity).GetComponent<WorldItem>();
                worldItem.Setup(item, amount);
                Destroy(worldItem.gameObject, despawnTime);
            }
        }
    }

    public void Despawn()
    {
        Destroy(gameObject);
    }
}

#if UNITY_EDITOR
[CustomEditor(typeof(ItemGenerator))]
public class ItemGeneratorEditor : Editor
{
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();

        if (GUILayout.Button("Generate ItemData"))
        {
            var generator = (ItemGenerator)target;
            var itemData = generator.GenerateItemData();

            string path = $"Assets/Inventory/Items/{itemData.itemName}.asset";
            AssetDatabase.CreateAsset(itemData, path);
            AssetDatabase.SaveAssets();

            Debug.Log($"Created item: {itemData.itemName} at {path}");
        }
    }
}
#endif