using Avalonia.Collections;
using Avalonia.Controls;
using Avalonia.Platform.Storage;
using DataLayer;
using Dinah.Core;
using LibationFileManager;
using LibationUiBase;
using System;
using System.IO;
using System.Linq;
using System.Reactive.Linq;
using System.Threading;

namespace LibationAvalonia.Dialogs
{
	public partial class LocateAudiobooksDialog : DialogWindow
	{
		private readonly CancellationTokenSource tokenSource = new();
		private readonly LocatedAudiobooksViewModel _viewModel;
		public LocateAudiobooksDialog()
		{
			InitializeComponent();

			var list = new AvaloniaList<FoundAudiobook>();
			DataContext = _viewModel = new(list);
			list.CollectionChanged += (_, _) => foundFilesDataGrid.ScrollIntoView(list[^1], foundFilesDataGrid.Columns[0]);
			this.RestoreSizeAndLocation(Configuration.Instance);

			if (Design.IsDesignMode)
			{
				_viewModel.AddFoundFile(new("0000000001", FileType.Audio, "Filename 1.m4b"));
				_viewModel.AddFoundFile(new("0000000002", FileType.Audio, "Filename 2.m4b"));
			}
			else
			{
				Opened += LocateAudiobooksDialog_Opened;
				Closing += LocateAudiobooksDialog_Closing;
			}
		}

		private void LocateAudiobooksDialog_Closing(object? sender, System.ComponentModel.CancelEventArgs e)
		{
			tokenSource.Cancel();
			//If this dialog is closed before it's completed, Closing is fired
			//once for the form closing and again for the MessageBox closing.
			Closing -= LocateAudiobooksDialog_Closing;
			this.SaveSizeAndLocation(Configuration.Instance);
		}

		private async void LocateAudiobooksDialog_Opened(object? sender, EventArgs e)
		{
			var folderPicker = new FolderPickerOpenOptions
			{
				Title = "Select the folder to search for audiobooks",
				AllowMultiple = false,
				SuggestedStartLocation = await StorageProvider.TryGetFolderFromPathAsync(Configuration.Instance.Books?.PathWithoutPrefix ?? "")
			};

			var selectedFolder = (await StorageProvider.OpenFolderPickerAsync(folderPicker))?.SingleOrDefault()?.TryGetLocalPath();

			if (selectedFolder is null || !Directory.Exists(selectedFolder))
			{
				await CancelAndCloseAsync();
			}
			else
			{
				await _viewModel.FindAndAddBooksAsync(selectedFolder, tokenSource.Token);
				await MessageBox.Show(this, $"Libation has found {_viewModel.FoundAsinCount} unique audiobooks and added them to its database. ", $"Found {_viewModel.FoundAsinCount} Audiobooks");
			}
		}

		private void foundFilesDataGrid_DoubleTapped(object? sender, Avalonia.Input.TappedEventArgs e)
		{
			if (sender is DataGrid dg && dg.SelectedItem is FoundAudiobook foundAudiobook)
				Go.To.File(foundAudiobook.Entry.Path);
		}
	}
}