using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;

using CamBooth.App.Core.AppSettings;
using CamBooth.App.Core.Logging;
using CamBooth.App.Features.PhotoPrismUpload;

namespace CamBooth.App.Features.PictureGallery;

public partial class PictureGalleryPage : Page
{
	private readonly AppSettingsService _appSettingsService;

	private readonly Logger _logger;

	private readonly PictureGalleryService _pictureGalleryService;

	private readonly PhotoPrismUploadService _photoPrismUploadService;

	private int _currentPage = 1;
	private int _itemsPerPage = 11;
	private int _totalPages = 1;

	// QR Code wird nur einmal erstellt und dann wiederverwendet
	private Border? _qrCodeBorder = null;


	public PictureGalleryPage(AppSettingsService appSettingsService, Logger logger, PictureGalleryService pictureGalleryService, PhotoPrismUploadService photoPrismUploadService)
	{
		this._appSettingsService = appSettingsService;
		this._logger = logger;
		this._pictureGalleryService = pictureGalleryService;
		this._photoPrismUploadService = photoPrismUploadService;
		this.InitializeComponent();
		this.Initialize();
	}


	private async void Initialize()
	{
		try
		{
			// QR-Code nur einmal beim Initialisieren erstellen
			CreateQRCodeBorder();
			
			_currentPage = 1;
			CalculateTotalPages();
			LoadCurrentPage();
			UpdatePagerControls();
		}
		catch (Exception e)
		{
			this._logger.Error(e.Message);
		}
	}

	private void CreateQRCodeBorder()
	{
		try
		{
			var qrCodeImage = this._photoPrismUploadService.GenerateAlbumQRCode();
			if (qrCodeImage != null)
			{
				// QR-Code Container mit Label
				var qrContainer = new StackPanel { Orientation = Orientation.Vertical };
				
				var qrImageControl = new Image
				{
					Source = qrCodeImage,
					Width = 220,
					Margin = new Thickness(4)
				};
				
				var qrSubLabel = new TextBlock
				{
					Text = "zum Fotoalbum",
					Foreground = new SolidColorBrush(Colors.White),
					FontSize = 11,
					FontWeight = FontWeights.Bold,
					TextAlignment = TextAlignment.Center,
					Margin = new Thickness(4, 0, 4, 2)
				};
				
				qrContainer.Children.Add(qrSubLabel);
				qrContainer.Children.Add(qrImageControl);
				
				_qrCodeBorder = new Border
				{
					Background = new SolidColorBrush(Colors.Black),
					BorderBrush = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#D4AF37")),
					BorderThickness = new Thickness(2),
					CornerRadius = new CornerRadius(6),
					Padding = new Thickness(4),
					Child = qrContainer,
					Margin = new Thickness(4)
				};
				
				this._logger.Debug("✅ PhotoPrism QR-Code statisch erstellt");
			}
		}
		catch (Exception ex)
		{
			this._logger.Warning($"PhotoPrism QR-Code konnte nicht generiert werden: {ex.Message}");
		}
	}


	private void LoadPictures(int startIndex, int count)
	{
		this.Dispatcher.Invoke(
			() =>
			{
				// Clear existing items
				this.PicturesPanel.Items.Clear();
				
				// Füge den statischen QR-Code als erstes Element hinzu
				if (_qrCodeBorder != null)
				{
					this.PicturesPanel.Items.Add(_qrCodeBorder);
				}
				
				// Jetzt die regulären Bilder hinzufügen
				int totalThumbnails = this._pictureGalleryService.ThumbnailsOrderedByNewestDescending.Count;
				int endIndex = Math.Min(startIndex + count, totalThumbnails);
				
				for (int i = startIndex; i < endIndex; i++)
				{
					BitmapImage thumbnail = this._pictureGalleryService.ThumbnailsOrderedByNewestDescending[i];

					TextBlock? textBlock = new();
					Hyperlink? hyperlink = new();
					hyperlink.Click += this.Hyperlink_OnClick;
					hyperlink.Tag = thumbnail.UriSource;
					hyperlink.TextDecorations = null;
					Image? imageControl = new()
					{
						Source = thumbnail,
						Width = 392,
						Margin = new Thickness(4)
					};
					hyperlink.Inlines.Add(new InlineUIContainer(imageControl));

					textBlock.Inlines.Add(hyperlink);
					this.PicturesPanel.Items.Add(textBlock);
				}
			});
	}


	public void CloseOpenDialog()
	{
		if (Dispatcher.CheckAccess())
			PhotoDialogOverlay.Hide();
		else
			Dispatcher.Invoke(() => PhotoDialogOverlay.Hide());
	}

	public async Task ShowPhotoDialogAsync(string picturePath)
	{
		var imageToShow = new Image
		{
			MaxHeight = 570,
			MaxWidth = 800,
			Stretch = System.Windows.Media.Stretch.Uniform,
			HorizontalAlignment = HorizontalAlignment.Center,
			Source = PictureGalleryService.CreateThumbnail(picturePath, 900, 600)
		};

		PhotoDialogOverlay.DialogContent = imageToShow;
		await PhotoDialogOverlay.ShowAsync();
	}

	private void Hyperlink_OnClick(object sender, RoutedEventArgs e)
	{
		Uri? picturePathUri = ((Hyperlink)sender).Tag as Uri;
		if (picturePathUri is null)
		{
			return;
		}

		string picturePath = Uri.UnescapeDataString(picturePathUri.AbsolutePath);
		_ = this.ShowPhotoDialogAsync(picturePath);
	}

	private void CalculateTotalPages()
	{
		int totalItems = this._pictureGalleryService.ThumbnailsOrderedByNewestDescending.Count;
		_totalPages = totalItems > 0 ? (int)Math.Ceiling((double)totalItems / _itemsPerPage) : 1;
	}

	private void LoadCurrentPage()
	{
		int startIndex = (_currentPage - 1) * _itemsPerPage;
		LoadPictures(startIndex, _itemsPerPage);
	}

	private void UpdatePagerControls()
	{
		this.Dispatcher.Invoke(() =>
		{
			PageInfoText.Text = $"Seite {_currentPage} von {_totalPages}";
			
			FirstPageButton.IsEnabled = _currentPage > 1;
			PreviousPageButton.IsEnabled = _currentPage > 1;
			NextPageButton.IsEnabled = _currentPage < _totalPages;
			LastPageButton.IsEnabled = _currentPage < _totalPages;
			
			// Visual feedback for disabled buttons
			FirstPageButton.Opacity = FirstPageButton.IsEnabled ? 1.0 : 0.5;
			PreviousPageButton.Opacity = PreviousPageButton.IsEnabled ? 1.0 : 0.5;
			NextPageButton.Opacity = NextPageButton.IsEnabled ? 1.0 : 0.5;
			LastPageButton.Opacity = LastPageButton.IsEnabled ? 1.0 : 0.5;
		});
	}

	private void FirstPageButton_Click(object sender, RoutedEventArgs e)
	{
		_currentPage = 1;
		LoadCurrentPage();
		UpdatePagerControls();
		GalleryScrollViewer.ScrollToTop();
	}

	private void PreviousPageButton_Click(object sender, RoutedEventArgs e)
	{
		if (_currentPage > 1)
		{
			_currentPage--;
			LoadCurrentPage();
			UpdatePagerControls();
			GalleryScrollViewer.ScrollToTop();
		}
	}

	private void NextPageButton_Click(object sender, RoutedEventArgs e)
	{
		if (_currentPage < _totalPages)
		{
			_currentPage++;
			LoadCurrentPage();
			UpdatePagerControls();
			GalleryScrollViewer.ScrollToTop();
		}
	}

	private void LastPageButton_Click(object sender, RoutedEventArgs e)
	{
		_currentPage = _totalPages;
		LoadCurrentPage();
		UpdatePagerControls();
		GalleryScrollViewer.ScrollToTop();
	}

	private void CloseGallery_Click(object sender, RoutedEventArgs e)
	{
		// Finde das MainWindow über die Window.GetWindow Methode
		var window = Window.GetWindow(this);
		if (window is MainWindow mainWindow)
		{
			mainWindow.ClosePicturePanel();
		}
		else
		{
			_logger.Warning("MainWindow konnte nicht gefunden werden, um die Galerie zu schließen");
		}
	}
}