namespace Ashwild.Inventory
{
    [System.Serializable]
    public class InventorySlot
    {
        private ItemData itemData;
        private int quantity;

        public ItemData ItemData => itemData;
        public int Quantity => quantity;
        public bool IsEmpty => itemData == null;

        public void Set(ItemData data, int qty)
        {
            itemData = data;
            quantity = qty;
        }

        public void Clear()
        {
            itemData = null;
            quantity = 0;
        }

        public int AddQuantity(int amount)
        {
            if (itemData == null || !itemData.IsStackable)
                return amount;

            int space = itemData.MaxStackSize - quantity;
            int toAdd = amount < space ? amount : space;
            quantity += toAdd;
            return amount - toAdd;
        }

        public void RemoveQuantity(int amount)
        {
            quantity -= amount;
            if (quantity <= 0)
                Clear();
        }

        public bool CanAccept(ItemData data)
        {
            if (IsEmpty) return true;
            return itemData == data && itemData.IsStackable && quantity < itemData.MaxStackSize;
        }
    }
}