ItemShopSellbackHelper.cs

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using System.Collections.Generic;
 
namespace Terraria.GameContent;
 
public class ItemShopSellbackHelper
{
    private class ItemMemo
    {
        public readonly int itemNetID;
 
        public readonly int itemPrefix;
 
        public int stack;
 
        public ItemMemo(Item item)
        {
            itemNetID = item.netID;
            itemPrefix = item.prefix;
            stack = item.stack;
        }
 
        public bool Matches(Item item)
        {
            if (item.netID == itemNetID)
            {
                return item.prefix == itemPrefix;
            }
            return false;
        }
    }
 
    private List<ItemMemo> _memos = new List<ItemMemo>();
 
    public void Add(Item item)
    {
        ItemMemo itemMemo = _memos.Find((ItemMemo x) => x.Matches(item));
        if (itemMemo != null)
        {
            itemMemo.stack += item.stack;
        }
        else
        {
            _memos.Add(new ItemMemo(item));
        }
    }
 
    public void Clear()
    {
        _memos.Clear();
    }
 
    public int GetAmount(Item item)
    {
        return _memos.Find((ItemMemo x) => x.Matches(item))?.stack ?? 0;
    }
 
    public int Remove(Item item)
    {
        ItemMemo itemMemo = _memos.Find((ItemMemo x) => x.Matches(item));
        if (itemMemo == null)
        {
            return 0;
        }
        int stack = itemMemo.stack;
        itemMemo.stack -= item.stack;
        if (itemMemo.stack <= 0)
        {
            _memos.Remove(itemMemo);
            return stack;
        }
        return stack - itemMemo.stack;
    }
}