using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Windows.Threading;
using System.Windows;

namespace BeWo.ViewModel.View.Developer
{
	public class DeveloperViewModel : WindowViewModel
	{
		private string _keyboardFocus;
		private string _logicalFocus;

		public string KeyboardFocus
		{
			get => _keyboardFocus;
			set => SetProperty(ref _keyboardFocus, value, nameof(KeyboardFocus));
		}

		public string LogicalFocus
		{
			get => _logicalFocus;
			set => SetProperty(ref _logicalFocus, value, nameof(LogicalFocus));
		}

		public DeveloperViewModel()
		{
			var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(200) };
			timer.Tick += (s, e) => Refresh();
			timer.Start();
		}

		private void Refresh()
		{
			// Keyboard Focus – globaler Input-Fokus, nur ein Element systemweit
			var keyboard = Keyboard.FocusedElement;
			KeyboardFocus = FormatElement(keyboard);

			// Logical Focus – pro FocusScope, kann vom Keyboard Focus abweichen
			// z.B. wenn ein Menü oder Toolbar aktiv ist
			var mainWindow = Application.Current.MainWindow;
			var logical = mainWindow != null
				? FocusManager.GetFocusedElement(mainWindow)
				: null;
			LogicalFocus = FormatElement(logical);
		}

		private static string FormatElement(object element)
		{
			if (element is null)
				return "(kein Fokus)";

			if (element is FrameworkElement fe)
			{
				var name = string.IsNullOrEmpty(fe.Name) ? "(kein Name)" : fe.Name;
				var dc = fe.DataContext?.GetType().Name ?? "–";
				return $"{fe.GetType().Name} | Name: {name} | DC: {dc}";
			}

			return element.GetType().Name;
		}
	}
}