using ApplicationServices;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Platform.Storage;
using DataLayer;
using FileLiberator;
using LibationAvalonia.Controls;
using LibationAvalonia.Dialogs;
using LibationAvalonia.ViewModels;
using LibationFileManager;
using LibationUiBase.GridView;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace LibationAvalonia.Views
{
	public partial class ProductsDisplay : UserControl
	{
		public event EventHandler<LibraryBook> LiberateClicked;
		public event EventHandler<ISeriesEntry> LiberateSeriesClicked;
		public event EventHandler<LibraryBook> ConvertToMp3Clicked;

		private ProductsDisplayViewModel _viewModel => DataContext as ProductsDisplayViewModel;
		ImageDisplayDialog imageDisplayDialog;

		public ProductsDisplay()
		{
			InitializeComponent();
			DataGridContextMenus.CellContextMenuStripNeeded += ProductsGrid_CellContextMenuStripNeeded;

			if (Design.IsDesignMode)
			{
				using var context = DbContexts.GetContext();
				List<LibraryBook> sampleEntries;
				try
				{
					sampleEntries = new()
					{
						//context.GetLibraryBook_Flat_NoTracking("B00DCD0OXU"),try{
						context.GetLibraryBook_Flat_NoTracking("B017WJ5ZK6"),
						context.GetLibraryBook_Flat_NoTracking("B017V4IWVG"),
						context.GetLibraryBook_Flat_NoTracking("B017V4JA2Q"),
						context.GetLibraryBook_Flat_NoTracking("B017V4NUPO"),
						context.GetLibraryBook_Flat_NoTracking("B017V4NMX4"),
						context.GetLibraryBook_Flat_NoTracking("B017V4NOZ0"),
						context.GetLibraryBook_Flat_NoTracking("B017WJ5ZK6")
					};
				}
				catch { sampleEntries = new(); }

				var pdvm = new ProductsDisplayViewModel();
				pdvm.BindToGrid(sampleEntries);
				DataContext = pdvm;

				return;
			}

			Configure_ColumnCustomization();

			foreach (var column in productsGrid.Columns)
			{
				column.CustomSortComparer = new RowComparer(column);
			}
		}

		private void RemoveColumn_PropertyChanged(object sender, AvaloniaPropertyChangedEventArgs e)
		{
			if (sender is DataGridColumn col && e.Property.Name == nameof(DataGridColumn.IsVisible))
			{
				col.DisplayIndex = 0;
				col.CanUserReorder = false;
			}
		}

		#region Cell Context Menu

		public void ProductsGrid_CellContextMenuStripNeeded(object sender, DataGridCellContextMenuStripNeededEventArgs args)
		{
			// stop light
			if (args.Column.SortMemberPath == "Liberate")
			{
				var entry = args.GridEntry;

				#region Liberate all Episodes

				if (entry.Liberate.IsSeries)
				{
					var liberateEpisodesMenuItem = new MenuItem()
					{
						Header = "_Liberate All Episodes",
						IsEnabled = ((ISeriesEntry)entry).Children.Any(c => c.Liberate.BookStatus is LiberatedStatus.NotLiberated or LiberatedStatus.PartialDownload)
					};

					args.ContextMenuItems.Add(liberateEpisodesMenuItem);

					liberateEpisodesMenuItem.Click += (_, _) => LiberateSeriesClicked?.Invoke(this, ((ISeriesEntry)entry));
				}

				#endregion
				#region Set Download status to Downloaded

				var setDownloadMenuItem = new MenuItem()
				{
					Header = "Set Download status to '_Downloaded'",
					IsEnabled = entry.Book.UserDefinedItem.BookStatus != LiberatedStatus.Liberated || entry.Liberate.IsSeries
				};

				args.ContextMenuItems.Add(setDownloadMenuItem);

				if (entry.Liberate.IsSeries)
					setDownloadMenuItem.Click += (_, __) => ((ISeriesEntry)entry).Children.Select(c => c.LibraryBook).UpdateBookStatus(LiberatedStatus.Liberated);
				else
					setDownloadMenuItem.Click += (_, __) => entry.LibraryBook.UpdateBookStatus(LiberatedStatus.Liberated);

				#endregion
				#region Set Download status to Not Downloaded

				var setNotDownloadMenuItem = new MenuItem()
				{
					Header = "Set Download status to '_Not Downloaded'",
					IsEnabled = entry.Book.UserDefinedItem.BookStatus != LiberatedStatus.NotLiberated || entry.Liberate.IsSeries
				};

				args.ContextMenuItems.Add(setNotDownloadMenuItem);

				if (entry.Liberate.IsSeries)
					setNotDownloadMenuItem.Click += (_, __) => ((ISeriesEntry)entry).Children.Select(c => c.LibraryBook).UpdateBookStatus(LiberatedStatus.NotLiberated);
				else
					setNotDownloadMenuItem.Click += (_, __) => entry.LibraryBook.UpdateBookStatus(LiberatedStatus.NotLiberated);

				#endregion
				#region Remove from library

				var removeMenuItem = new MenuItem() { Header = "_Remove from library" };

				args.ContextMenuItems.Add(removeMenuItem);

				if (entry.Liberate.IsSeries)
					removeMenuItem.Click += async (_, __) => await ((ISeriesEntry)entry).Children.Select(c => c.LibraryBook).RemoveBooksAsync();
				else
					removeMenuItem.Click += async (_, __) => await Task.Run(entry.LibraryBook.RemoveBook);

				#endregion

				if (!entry.Liberate.IsSeries)
				{
					#region Locate file
					var locateFileMenuItem = new MenuItem() { Header = "_Locate file..." };

					args.ContextMenuItems.Add(locateFileMenuItem);

					locateFileMenuItem.Click += async (_, __) =>
					{
						try
						{
							var window = this.GetParentWindow();

							var openFileDialogOptions = new FilePickerOpenOptions
							{
								Title = $"Locate the audio file for '{entry.Book.TitleWithSubtitle}'",
								AllowMultiple = false,
								SuggestedStartLocation = await window.StorageProvider.TryGetFolderFromPathAsync(Configuration.Instance.Books.PathWithoutPrefix),
								FileTypeFilter = new FilePickerFileType[]
								{
								new("All files (*.*)") { Patterns = new[] { "*" } },
								}
							};

							var selectedFiles = await window.StorageProvider.OpenFilePickerAsync(openFileDialogOptions);
							var selectedFile = selectedFiles.SingleOrDefault()?.TryGetLocalPath();

							if (selectedFile is not null)
								FilePathCache.Insert(entry.AudibleProductId, selectedFile);
						}
						catch (Exception ex)
						{
							var msg = "Error saving book's location";
							await MessageBox.ShowAdminAlert(null, msg, msg, ex);
						}
					};

					#endregion
					#region Convert to Mp3
					var convertToMp3MenuItem = new MenuItem
					{
						Header = "_Convert to Mp3",
						IsEnabled = entry.Book.UserDefinedItem.BookStatus is LiberatedStatus.Liberated
					};
					args.ContextMenuItems.Add(convertToMp3MenuItem);

					convertToMp3MenuItem.Click += (_, _) => ConvertToMp3Clicked?.Invoke(this, entry.LibraryBook);

					#endregion
				}

				args.ContextMenuItems.Add(new Separator());

				#region View Bookmarks/Clips

				if (!entry.Liberate.IsSeries)
				{

					var bookRecordMenuItem = new MenuItem { Header = "View _Bookmarks/Clips" };

					args.ContextMenuItems.Add(bookRecordMenuItem);

					bookRecordMenuItem.Click += async (_, _) => await new BookRecordsDialog(entry.LibraryBook).ShowDialog(VisualRoot as Window);
				}

				#endregion
				#region View All Series

				if (entry.Book.SeriesLink.Any())
				{
					var header = entry.Liberate.IsSeries ? "View All Episodes in Series" : "View All Books in Series";
					var viewSeriesMenuItem = new MenuItem { Header = header };

					args.ContextMenuItems.Add(viewSeriesMenuItem);

					viewSeriesMenuItem.Click += (_, _) => new SeriesViewDialog(entry.LibraryBook).Show();
				}

				#endregion
			}
			else
			{
				// any non-stop light column
				// (except for the Cover column which does not have a context menu)
				var menuItem = new MenuItem { Header = "_Copy Cell Contents" };

				menuItem.Click += async (s, e)
					=> await App.MainWindow.Clipboard.SetTextAsync(args.CellClipboardContents);

				args.ContextMenuItems.Add(menuItem);
			}
		}

		#endregion

		#region Column Customizations

		private void Configure_ColumnCustomization()
		{
			if (Design.IsDesignMode) return;

			productsGrid.ColumnDisplayIndexChanged += ProductsGrid_ColumnDisplayIndexChanged;

			var config = Configuration.Instance;
			var gridColumnsVisibilities = config.GridColumnsVisibilities;
			var displayIndices = config.GridColumnsDisplayIndices;

			var contextMenu = new ContextMenu();
			contextMenu.Closed += ContextMenu_MenuClosed;
			contextMenu.Opening += ContextMenu_ContextMenuOpening;
			List<Control> menuItems = new();
			contextMenu.ItemsSource = menuItems;

			menuItems.Add(new MenuItem { Header = "Show / Hide Columns" });
			menuItems.Add(new MenuItem { Header = "-" });

			var HeaderCell_PI = typeof(DataGridColumn).GetProperty("HeaderCell", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

			foreach (var column in productsGrid.Columns)
			{
				var itemName = column.SortMemberPath;

				if (itemName == nameof(IGridEntry.Remove))
					continue;

				menuItems.Add
					(
						new MenuItem
						{
							Header = ((string)column.Header).Replace('\n', ' '),
							Tag = column,
							Icon = new CheckBox(),
						}
					);

				var headercell = HeaderCell_PI.GetValue(column) as DataGridColumnHeader;
				headercell.ContextMenu = contextMenu;

				column.IsVisible = gridColumnsVisibilities.GetValueOrDefault(itemName, true);
			}

			//We must set DisplayIndex properties in ascending order
			foreach (var itemName in displayIndices.OrderBy(i => i.Value).Select(i => i.Key))
			{
				if (!productsGrid.Columns.Any(c => c.SortMemberPath == itemName))
					continue;

				var column = productsGrid.Columns
					.Single(c => c.SortMemberPath == itemName);

				column.DisplayIndex = displayIndices.GetValueOrDefault(itemName, productsGrid.Columns.IndexOf(column));
			}
		}

		private void ContextMenu_ContextMenuOpening(object sender, System.ComponentModel.CancelEventArgs e)
		{
			var contextMenu = sender as ContextMenu;
			foreach (var mi in contextMenu.Items.OfType<MenuItem>())
			{
				if (mi.Tag is DataGridColumn column)
				{
					var cbox = mi.Icon as CheckBox;
					cbox.IsChecked = column.IsVisible;
				}
			}
		}

		private void ContextMenu_MenuClosed(object sender, Avalonia.Interactivity.RoutedEventArgs e)
		{
			var contextMenu = sender as ContextMenu;
			var config = Configuration.Instance;
			var dictionary = config.GridColumnsVisibilities;

			foreach (var mi in contextMenu.Items.OfType<MenuItem>())
			{
				if (mi.Tag is DataGridColumn column)
				{
					var cbox = mi.Icon as CheckBox;
					column.IsVisible = cbox.IsChecked == true;
					dictionary[column.SortMemberPath] = cbox.IsChecked == true;
				}
			}

			//If all columns are hidden, register the context menu on the grid so users can unhide.
			if (!productsGrid.Columns.Any(c => c.IsVisible))
				productsGrid.ContextMenu = contextMenu;
			else
				productsGrid.ContextMenu = null;

			config.GridColumnsVisibilities = dictionary;
		}

		private void ProductsGrid_ColumnDisplayIndexChanged(object sender, DataGridColumnEventArgs e)
		{
			var config = Configuration.Instance;

			var dictionary = config.GridColumnsDisplayIndices;
			dictionary[e.Column.SortMemberPath] = e.Column.DisplayIndex;
			config.GridColumnsDisplayIndices = dictionary;
		}

		#endregion

		#region Button Click Handlers

		public async void LiberateButton_Click(object sender, EventArgs e)
		{
			var button = sender as LiberateStatusButton;

			if (button.DataContext is ISeriesEntry sEntry)
			{
				await _viewModel.ToggleSeriesExpanded(sEntry);

				//Expanding and collapsing reset the list, which will cause focus to shift
				//to the topright cell. Reset focus onto the clicked button's cell.
				button.Focus();
			}
			else if (button.DataContext is ILibraryBookEntry lbEntry)
			{
				LiberateClicked?.Invoke(this, lbEntry.LibraryBook);
			}
		}

		public void CloseImageDisplay()
		{
			if (imageDisplayDialog is not null && imageDisplayDialog.IsVisible)
				imageDisplayDialog.Close();
		}

		public void Version_DoubleClick(object sender, Avalonia.Input.TappedEventArgs args)
		{
			if (sender is Control panel && panel.DataContext is ILibraryBookEntry lbe && lbe.LastDownload.IsValid)
				lbe.LastDownload.OpenReleaseUrl();
		}

		public void Cover_Click(object sender, Avalonia.Input.TappedEventArgs args)
		{
			if (sender is not Image tblock || tblock.DataContext is not IGridEntry gEntry)
				return;

			if (imageDisplayDialog is null || !imageDisplayDialog.IsVisible)
			{
				imageDisplayDialog = new ImageDisplayDialog();
			}

			var picDef = new PictureDefinition(gEntry.LibraryBook.Book.PictureLarge ?? gEntry.LibraryBook.Book.PictureId, PictureSize.Native);

			void PictureCached(object sender, PictureCachedEventArgs e)
			{
				if (e.Definition.PictureId == picDef.PictureId)
					imageDisplayDialog.SetCoverBytes(e.Picture);

				PictureStorage.PictureCached -= PictureCached;
			}

			PictureStorage.PictureCached += PictureCached;
			(bool isDefault, byte[] initialImageBts) = PictureStorage.GetPicture(picDef);


			var windowTitle = $"{gEntry.Title} - Cover";


			imageDisplayDialog.BookSaveDirectory = AudibleFileStorage.Audio.GetDestinationDirectory(gEntry.LibraryBook);
			imageDisplayDialog.PictureFileName = System.IO.Path.GetFileName(AudibleFileStorage.Audio.GetBooksDirectoryFilename(gEntry.LibraryBook, ".jpg"));
			imageDisplayDialog.Title = windowTitle;
			imageDisplayDialog.SetCoverBytes(initialImageBts);

			if (!isDefault)
				PictureStorage.PictureCached -= PictureCached;

			if (imageDisplayDialog.IsVisible)
				imageDisplayDialog.Activate();
			else
				imageDisplayDialog.Show();
		}

		public void Description_Click(object sender, Avalonia.Input.TappedEventArgs args)
		{
			if (sender is Control tblock && tblock.DataContext is IGridEntry gEntry)
			{
				var pt = tblock.PointToScreen(tblock.Bounds.TopRight);
				var displayWindow = new DescriptionDisplayDialog
				{
					SpawnLocation = new Point(pt.X, pt.Y),
					DescriptionText = gEntry.LongDescription,
				};

				void CloseWindow(object o, DataGridRowEventArgs e)
				{
					displayWindow.Close();
				}
				productsGrid.LoadingRow += CloseWindow;
				displayWindow.Closing += (_, _) =>
				{
					productsGrid.LoadingRow -= CloseWindow;
				};

				displayWindow.Show();
			}
		}

		BookDetailsDialog bookDetailsForm;

		public void OnTagsButtonClick(object sender, Avalonia.Interactivity.RoutedEventArgs args)
		{
			var button = args.Source as Button;

			if (button.DataContext is ILibraryBookEntry lbEntry && VisualRoot is Window window)
			{
				if (bookDetailsForm is null || !bookDetailsForm.IsVisible)
				{
					bookDetailsForm = new BookDetailsDialog(lbEntry.LibraryBook);
					bookDetailsForm.Show(window);
				}
				else
					bookDetailsForm.LibraryBook = lbEntry.LibraryBook;
			}
		}

		#endregion
	}
}