cirnogodot/Scripts/UI/ItemsMenu.cs

using Godot;
using System;
using Cirno.Scripts;
using Godot.Collections;

public partial class ItemsMenu : ItemList
{
    private InventoryManager _inventoryManager;
    private Dictionary<long, string> _itemsDic = new();

    private GameManager _gameManager;
    
    [Export]
    public string InventoryActionName { get; private set; } = "inventory";
    
    [Export]
    public string PauseActionName { get; private set; } = "pause";
    
    public override void _Ready()
    {
        CallDeferred(MethodName.DeferredInitialize);
        this.Hide();
    }

    public override void _Process(double delta)
    {
        if (Input.IsActionJustPressed(InventoryActionName) || Input.IsActionJustPressed(PauseActionName))
        {
            if (Visible)
            {
                CallDeferred(MethodName.HideInventory);
            }
            // else
            // {
            //     ShowInventory();
            // }
        }
    }

    private void DeferredInitialize()
    {
        _gameManager = GameManager.Instance;
        _inventoryManager = _gameManager.GetInventoryManager();
        
        ItemSelected += OnItemSelected;
        Clear();
        
        ItemActivated += OnItemSelected;

        _gameManager.GameStateChange += state =>
        {
            switch (state)
            {
                case GameState.Inventory:
                    CallDeferred(MethodName.ShowInventory);
                    break;
                default:
                    CallDeferred(MethodName.HideInventory);
                    //HideInventory();
                    break;
            }
        };
    }

    private void OnItemSelected(long index)
    {
        var item = _itemsDic[index];
        GD.Print("Item: " + item);
        HideInventory();
        
        _inventoryManager.UseItem(item);
    }

    private void HideInventory()
    {
        if (!Visible) return;
        GD.Print("Hiding inventory");
        this.Hide();
        Clear();
        _itemsDic.Clear();
        
        GameManager.Instance.ChangeState(GameState.Playing);
    }

    private void ShowInventory()
    {
        if (Visible) return;
        GD.Print("Showing inventory");
        this.Show();
        foreach (var item in _inventoryManager.Items)
        {
            if (item.Count <= 0) continue;
            
            var index = this.AddItem($"{item.Item.ItemName} x{item.Count}", item.Item.InventorySprite,
                item.Item.Selectable);
            
            this.SetItemTooltip(index, item.Item.ItemDescription);
            
            _itemsDic.Add(index, item.Item.ItemKey);
            
        }
    }
}