using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Cirno.Scripts.Utils;
using Godot;

namespace Cirno.Scripts.UI;

public partial class InventoryMenu : TabContainer
{
    private List<ItemsMenu> _itemMenus = [];
    
    [Export]
    public StringName InventoryActionName { get; private set; } = "inventory";
    
    [Export]
    public StringName PauseActionName { get; private set; } = "pause";
    
    [Export]
    public StringName CancelActionName { get; private set; } = "ui_cancel";
    
    [Export]
    public Control ParentContainer { get; private set; }
    
    public override void _Ready()
    {
        CallDeferred(MethodName.DeferredInitialize);
        
        HideCommand();
    }

    private void ShowCommand()
    {
        ParentContainer?.Show();

        this.Show();
    }

    private void HideCommand()
    {
        if (ParentContainer is not null)
        {
            ParentContainer.Hide();
            this.Show();
        }
        else
        {
            this.Hide();
        }
    }

    private new bool IsVisible()
    {
        return ParentContainer?.Visible ?? Visible;
    }
    
    public override void _Process(double delta)
    {
        if (Input.IsActionJustPressed(InventoryActionName) || 
            Input.IsActionJustPressed(PauseActionName) || 
            Input.IsActionJustPressed(CancelActionName))
        {
            if (IsVisible())
            {
                GameStateManager.Instance.ChangeState(GameState.Playing);
                //CallDeferred(MethodName.HideInventory);
            }
            // else
            // {
            //     ShowInventory();
            // }
        }
    }
    
    private void DeferredInitialize()
    {
        var children = this.GetChildren();
        foreach (var child in children)
        {
            if (child is ItemsMenu menu)
            {
                _itemMenus.Add(menu);
                menu.Init(this);
            }
        }
        //Clear();
        
        //ItemActivated += OnItemSelected;

        // TODO: Move this on the game manager/controller side
        if (GameStateManager.Instance is not null)
        {
            GameStateManager.Instance.GameStateChange += state =>
            {
                switch (state)
                {
                    case GameState.Inventory:
                        //CallDeferred(MethodName.ShowInventory);
                        ShowInventory();
                        break;
                    default:
                        HideInventory();
                        //_ = UnpauseAsync();
                        // _ = new Task(async () =>
                        // {
                        //     await ToSignal(GetTree(), SceneTree.SignalName.ProcessFrame);
                        //     HideInventory();
                        // });
                        //CallDeferred(MethodName.HideInventory);
                        //HideInventory();
                        break;
                }
            };
        }
    }

    private async Task UnpauseAsync()
    {
        await ToSignal(GetTree(), SceneTree.SignalName.ProcessFrame);
        HideInventory();
    }
    
    private void HideInventory()
    {
        if (!IsVisible()) return;
        
        HideCommand();

        foreach (var menu in _itemMenus)
        {
            menu.Empty();
        }
    }

    private void ShowInventory()
    {
        if (IsVisible()) return;
        
        ShowCommand();
        
        foreach (var menu in _itemMenus)
        {
            menu.Fill();
        }
        
        _itemMenus.FirstOrDefault()?.GrabFocus();
    }
}