cirnogodot/Scripts/InventoryManager.cs

using Godot;
using System;
using System.Collections.Generic;
using System.Linq;
using Cirno.Scripts;
using Cirno.Scripts.Resources;

public partial class InventoryManager : Node2D
{
	public bool RedKeycard { get; set; }
	
	private Dictionary<string, ItemContainer> _itemsDict = new Dictionary<string, ItemContainer>();
	
	public Dictionary<string, ItemContainer> Items => _itemsDict;
	
	[Signal]
	public delegate void ItemAddedEventHandler(LootItem item, int currentAmount);
	
	[Signal]
	public delegate void ItemRemovedEventHandler(string itemKey, int currentAmount);
	
	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
	}
	
	public bool HasItems(List<string> itemKeys)
	{
		return itemKeys.Aggregate(false, (current, item) => current || GetItemCount(item) > 0);
	}
	
	public int GetItemCount(string itemKey)
	{
		return _itemsDict.TryGetValue(itemKey, out var itm) ? itm.Count : 0;
	}

	public int RemoveItem(string itemKey, int amount)
	{
		if (!_itemsDict.TryGetValue(itemKey, out var itm)) return 0;

		int removed = Math.Min(itm.Count, amount);
			
		itm.Count -= amount;

		if (itm.Count <= 0)
		{
			_itemsDict.Remove(itemKey);
		}
			
		EmitSignal(nameof(ItemRemoved), itemKey, itm.Count);

		return removed;

	}
	
	public bool AddItem(LootItem item)
	{
		//var item = new LootItem() { Item = type, Amount = amount };

		if (!_itemsDict.TryGetValue(item.ItemKey, out var itm))
		{
			_itemsDict.Add(item.ItemKey, new ItemContainer()
			{
				Item = item,
				Count = item.Amount,
			});
			GD.Print($"Added new ({item.ItemKey}) {item.Item} x{item.Amount}");
			
			EmitSignal(nameof(ItemAdded), item, item.Amount);
		}
		else
		{
			if (itm.Count < item.Max)
			{
				itm.Count += item.Amount;
			}
			else 
			{
				if (item.PickupIfMaxed)
				{
					itm.Count = item.Max;
				}
				else
				{
					return false;
				}
			}
			EmitSignal(nameof(ItemAdded), item, itm.Count);
		}
		
		return true;
	}
	
	public void AddRedKeycard()
	{
		RedKeycard = true;
	}

	public void RemoveRedKeycard()
	{
		RedKeycard = false;
	}
}

public class ItemContainer
{
	public LootItem Item { get; set; }
	public int Count { get; set; }
}