using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Tango.Core.Commands;
using Tango.Core.IO;

namespace Tango.FileSystem
{
    public class FileExplorerControl : Control
    {
        private ListBox _listBox;
        private DataGrid _datagrid;
        private bool _preventSynchronization;
        private Point _dragOutStartPoint;
        private bool _isMouseDown;
        private List<FileSystemItem> _selectedItemsBeforeDrag;
        private List<FileSystemItem> _copyItems;
        private bool _isCut;
        private bool _isAfterContextMenu;

        #region IsCut Attached Property

        /// <summary>
        /// Determines whether the draggable element is currently being dragged.
        /// </summary>
        public static readonly DependencyProperty IsCutProperty =
            DependencyProperty.RegisterAttached("IsCut",
            typeof(bool), typeof(FileExplorerControl),
            new FrameworkPropertyMetadata(false));

        /// <summary>
        /// Sets the IsCut attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <param name="value">if set to <c>true</c> [value].</param>
        public static void SetIsCut(FrameworkElement element, bool value)
        {
            element.SetValue(IsCutProperty, value);
        }

        /// <summary>
        /// Gets the is dragging attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <returns></returns>
        public static bool GetIsCut(FrameworkElement element)
        {
            return (bool)element.GetValue(IsCutProperty);
        }

        #endregion

        public IFileSystemContainer CurrentItem
        {
            get { return (IFileSystemContainer)GetValue(CurrentItemProperty); }
            set { SetValue(CurrentItemProperty, value); }
        }
        public static readonly DependencyProperty CurrentItemProperty =
            DependencyProperty.Register("CurrentItem", typeof(IFileSystemContainer), typeof(FileExplorerControl), new PropertyMetadata(null, (d, e) => (d as FileExplorerControl).OnCurrentItemChanged()));

        public FileSystemItem SelectedItem
        {
            get { return (FileSystemItem)GetValue(SelectedItemProperty); }
            set { SetValue(SelectedItemProperty, value); }
        }
        public static readonly DependencyProperty SelectedItemProperty =
            DependencyProperty.Register("SelectedItem", typeof(FileSystemItem), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand ItemDoubleClickedCommand
        {
            get { return (ICommand)GetValue(ItemDoubleClickedCommandProperty); }
            set { SetValue(ItemDoubleClickedCommandProperty, value); }
        }
        public static readonly DependencyProperty ItemDoubleClickedCommandProperty =
            DependencyProperty.Register("ItemDoubleClickedCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DeleteCommand
        {
            get { return (ICommand)GetValue(DeleteCommandProperty); }
            set { SetValue(DeleteCommandProperty, value); }
        }
        public static readonly DependencyProperty DeleteCommandProperty =
            DependencyProperty.Register("DeleteCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DeleteCommandInternal
        {
            get { return (ICommand)GetValue(DeleteCommandInternalProperty); }
            set { SetValue(DeleteCommandInternalProperty, value); }
        }
        public static readonly DependencyProperty DeleteCommandInternalProperty =
            DependencyProperty.Register("DeleteCommandInternal", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DropCommand
        {
            get { return (ICommand)GetValue(DropCommandProperty); }
            set { SetValue(DropCommandProperty, value); }
        }
        public static readonly DependencyProperty DropCommandProperty =
            DependencyProperty.Register("DropCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DragCommand
        {
            get { return (ICommand)GetValue(DragCommandProperty); }
            set { SetValue(DragCommandProperty, value); }
        }
        public static readonly DependencyProperty DragCommandProperty =
            DependencyProperty.Register("DragCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand CopyCommand
        {
            get { return (ICommand)GetValue(CopyCommandProperty); }
            set { SetValue(CopyCommandProperty, value); }
        }
        public static readonly DependencyProperty CopyCommandProperty =
            DependencyProperty.Register("CopyCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand CutCommand
        {
            get { return (ICommand)GetValue(CutCommandProperty); }
            set { SetValue(CutCommandProperty, value); }
        }
        public static readonly DependencyProperty CutCommandProperty =
            DependencyProperty.Register("CutCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand CopyPasteCommand
        {
            get { return (ICommand)GetValue(CopyPasteCommandProperty); }
            set { SetValue(CopyPasteCommandProperty, value); }
        }
        public static readonly DependencyProperty CopyPasteCommandProperty =
            DependencyProperty.Register("CopyPasteCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand CutPasteCommand
        {
            get { return (ICommand)GetValue(CutPasteCommandProperty); }
            set { SetValue(CutPasteCommandProperty, value); }
        }
        public static readonly DependencyProperty CutPasteCommandProperty =
            DependencyProperty.Register("CutPasteCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand PasteCommandInternal
        {
            get { return (ICommand)GetValue(PasteCommandInternalProperty); }
            set { SetValue(PasteCommandInternalProperty, value); }
        }
        public static readonly DependencyProperty PasteCommandInternalProperty =
            DependencyProperty.Register("PasteCommandInternal", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand SelectAllCommand
        {
            get { return (ICommand)GetValue(SelectAllCommandProperty); }
            set { SetValue(SelectAllCommandProperty, value); }
        }
        public static readonly DependencyProperty SelectAllCommandProperty =
            DependencyProperty.Register("SelectAllCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DownloadCommandInternal
        {
            get { return (ICommand)GetValue(DownloadCommandInternalProperty); }
            set { SetValue(DownloadCommandInternalProperty, value); }
        }
        public static readonly DependencyProperty DownloadCommandInternalProperty =
            DependencyProperty.Register("DownloadCommandInternal", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand DownloadCommand
        {
            get { return (ICommand)GetValue(DownloadCommandProperty); }
            set { SetValue(DownloadCommandProperty, value); }
        }
        public static readonly DependencyProperty DownloadCommandProperty =
            DependencyProperty.Register("DownloadCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand OpenCommand
        {
            get { return (ICommand)GetValue(OpenCommandProperty); }
            set { SetValue(OpenCommandProperty, value); }
        }
        public static readonly DependencyProperty OpenCommandProperty =
            DependencyProperty.Register("OpenCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand BackCommand
        {
            get { return (ICommand)GetValue(BackCommandProperty); }
            set { SetValue(BackCommandProperty, value); }
        }
        public static readonly DependencyProperty BackCommandProperty =
            DependencyProperty.Register("BackCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand RenameCommand
        {
            get { return (ICommand)GetValue(RenameCommandProperty); }
            set { SetValue(RenameCommandProperty, value); }
        }
        public static readonly DependencyProperty RenameCommandProperty =
            DependencyProperty.Register("RenameCommand", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ICommand RenameCommandInternal
        {
            get { return (ICommand)GetValue(RenameCommandInternalProperty); }
            set { SetValue(RenameCommandInternalProperty, value); }
        }
        public static readonly DependencyProperty RenameCommandInternalProperty =
            DependencyProperty.Register("RenameCommandInternal", typeof(ICommand), typeof(FileExplorerControl), new PropertyMetadata(null));

        public bool IsContextMenuOpened
        {
            get { return (bool)GetValue(IsContextMenuOpenedProperty); }
            set { SetValue(IsContextMenuOpenedProperty, value); }
        }
        public static readonly DependencyProperty IsContextMenuOpenedProperty =
            DependencyProperty.Register("IsContextMenuOpened", typeof(bool), typeof(FileExplorerControl), new PropertyMetadata(false, (d, e) => (d as FileExplorerControl).OnIsContextMenuOpenedChanged()));

        public ImageSource DriveIcon
        {
            get { return (ImageSource)GetValue(DriveIconProperty); }
            set { SetValue(DriveIconProperty, value); }
        }
        public static readonly DependencyProperty DriveIconProperty =
            DependencyProperty.Register("DriveIcon", typeof(ImageSource), typeof(FileExplorerControl), new PropertyMetadata(null));

        public ImageSource FolderIcon
        {
            get { return (ImageSource)GetValue(FolderIconProperty); }
            set { SetValue(FolderIconProperty, value); }
        }
        public static readonly DependencyProperty FolderIconProperty =
            DependencyProperty.Register("FolderIcon", typeof(ImageSource), typeof(FileExplorerControl), new PropertyMetadata(null));

        public FileExplorerControlMode Mode
        {
            get { return (FileExplorerControlMode)GetValue(ModeProperty); }
            set { SetValue(ModeProperty, value); }
        }
        public static readonly DependencyProperty ModeProperty =
            DependencyProperty.Register("Mode", typeof(FileExplorerControlMode), typeof(FileExplorerControl), new PropertyMetadata(FileExplorerControlMode.Large));

        public ObservableCollection<FileSystemItem> SelectedItems
        {
            get { return (ObservableCollection<FileSystemItem>)GetValue(SelectedItemsProperty); }
            set { SetValue(SelectedItemsProperty, value); }
        }
        public static readonly DependencyProperty SelectedItemsProperty =
            DependencyProperty.Register("SelectedItems", typeof(ObservableCollection<FileSystemItem>), typeof(FileExplorerControl), new PropertyMetadata(null, (d, e) => (d as FileExplorerControl).OnSelectedItemsChanged()));

        public bool AllowDrag
        {
            get { return (bool)GetValue(AllowDragProperty); }
            set { SetValue(AllowDragProperty, value); }
        }
        public static readonly DependencyProperty AllowDragProperty =
            DependencyProperty.Register("AllowDrag", typeof(bool), typeof(FileExplorerControl), new PropertyMetadata(null));

        static FileExplorerControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(FileExplorerControl), new FrameworkPropertyMetadata(typeof(FileExplorerControl)));
        }

        public FileExplorerControl()
        {
            Focusable = true;

            _copyItems = new List<FileSystemItem>();
            _selectedItemsBeforeDrag = new List<FileSystemItem>();

            CopyCommand = new RelayCommand(() =>
            {
                ResetItemsCut();
                _copyItems.Clear();
                _copyItems.AddRange(SelectedItems.ToList());
                _isCut = false;
            }, () => SelectedItems != null && SelectedItems.Count > 0);

            CutCommand = new RelayCommand(() =>
            {
                _copyItems.Clear();
                _copyItems.AddRange(SelectedItems.ToList());
                CutSelectedItems();
                _isCut = true;

            }, () => SelectedItems != null && SelectedItems.Count > 0);

            PasteCommandInternal = new RelayCommand(() =>
            {
                if (_isCut)
                {
                    CutPasteCommand?.Execute(_copyItems.ToList());
                }
                else
                {
                    CopyPasteCommand?.Execute(_copyItems.ToList());
                }

                ResetItemsCut();
                _copyItems.Clear();
            }, () => _copyItems.Count > 0);

            SelectAllCommand = new RelayCommand(() =>
            {
                ResetItemsCut();
                _copyItems.Clear();
                SelectedItems.Clear();

                if (CurrentItem != null)
                {
                    foreach (var item in CurrentItem.Items)
                    {
                        SelectedItems.Add(item);
                    }
                }
            });

            DownloadCommandInternal = new RelayCommand(() =>
            {

                DownloadCommand?.Execute(SelectedItems.ToList());

            }, () => SelectedItems != null && SelectedItems.Count > 0 && SelectedItems.All(x => x.Type != FileSystemItemType.Drive));

            OpenCommand = new RelayCommand(() =>
            {
                ItemDoubleClickedCommand?.Execute(SelectedItems.FirstOrDefault());
            }, () => SelectedItems != null && SelectedItems.Count == 1);

            DeleteCommandInternal = new RelayCommand(() =>
            {

                DeleteCommand?.Execute(SelectedItems.ToList());

            }, () => SelectedItems != null && SelectedItems.Count > 1 && SelectedItems.All(x => x.Type != FileSystemItemType.Drive));

            RenameCommandInternal = new RelayCommand(() => 
            {

                RenameCommand?.Execute(SelectedItems.FirstOrDefault());

            }, () => SelectedItems != null && SelectedItems.Count == 1 && SelectedItems.All(x => x.Type != FileSystemItemType.Drive));
        }

        private void OnIsContextMenuOpenedChanged()
        {
            _isMouseDown = false;
            (PasteCommandInternal as RelayCommand)?.RaiseCanExecuteChanged();
            (CutCommand as RelayCommand)?.RaiseCanExecuteChanged();
            (CopyCommand as RelayCommand)?.RaiseCanExecuteChanged();
            (DownloadCommandInternal as RelayCommand)?.RaiseCanExecuteChanged();
            (OpenCommand as RelayCommand)?.RaiseCanExecuteChanged();
            (DeleteCommandInternal as RelayCommand)?.RaiseCanExecuteChanged();
            (RenameCommandInternal as RelayCommand)?.RaiseCanExecuteChanged();

            if (IsContextMenuOpened)
            {
                _isAfterContextMenu = true;
            }
        }

        private void ResetItemsCut()
        {
            foreach (var item in _listBox.Items)
            {
                var element = _listBox.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;
                if (element != null)
                {
                    SetIsCut(element, false);
                }

                element = _datagrid.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;
                if (element != null)
                {
                    SetIsCut(element, false);
                }
            }
        }

        private void CutSelectedItems()
        {
            ResetItemsCut();

            foreach (var item in SelectedItems.ToList())
            {
                var element = _listBox.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;
                if (element != null)
                {
                    SetIsCut(element, true);
                }

                element = _datagrid.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;
                if (element != null)
                {
                    SetIsCut(element, true);
                }
            }
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            _listBox = GetTemplateChild("PART_listbox") as ListBox;
            _datagrid = GetTemplateChild("PART_datagrid") as DataGrid;

            _listBox.SelectionChanged += _listBox_SelectionChanged;
            _datagrid.SelectionChanged += _datagrid_SelectionChanged;
        }

        protected override void OnPreviewKeyDown(KeyEventArgs e)
        {
            base.OnPreviewKeyDown(e);

            if (e.Key == Key.Delete)
            {
                if (DeleteCommandInternal != null && DeleteCommandInternal.CanExecute(null))
                {
                    DeleteCommandInternal?.Execute(null);
                }
            }
            else if (e.Key == Key.Return)
            {
                if (OpenCommand != null && OpenCommand.CanExecute(null))
                {
                    OpenCommand?.Execute(null);
                }
            }
            else if (e.Key == Key.C && Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                if (CopyCommand != null && CopyCommand.CanExecute(null))
                {
                    CopyCommand.Execute(null);
                }
            }
            else if (e.Key == Key.X && Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                if (CutCommand != null && CutCommand.CanExecute(null))
                {
                    CutCommand.Execute(null);
                }
            }
            else if (e.Key == Key.V && Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                if (PasteCommandInternal != null && PasteCommandInternal.CanExecute(null))
                {
                    PasteCommandInternal.Execute(null);
                }
            }
            else if (e.Key == Key.A && Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                if (SelectAllCommand != null && SelectAllCommand.CanExecute(null))
                {
                    SelectAllCommand.Execute(null);
                }
            }
            else if (e.Key == Key.D && Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                if (DownloadCommandInternal != null && DownloadCommandInternal.CanExecute(null))
                {
                    DownloadCommandInternal.Execute(null);
                }
            }
            else if (e.Key == Key.F2)
            {
                if (RenameCommandInternal != null && RenameCommandInternal.CanExecute(null))
                {
                    RenameCommandInternal.Execute(null);
                }
            }
            else if (e.Key == Key.Down)
            {
                if (SelectedItems != null && SelectedItems.Count == 0 && CurrentItem != null && CurrentItem.Items.Count > 0)
                {
                    SelectedItems.Add(CurrentItem.Items.FirstOrDefault());
                }
            }
            else if (e.Key == Key.Back)
            {
                BackCommand?.Execute(null);
            }
        }

        private void _datagrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (!_preventSynchronization)
            {
                _preventSynchronization = true;

                _listBox.SelectedItems.Clear();

                foreach (var item in _datagrid.SelectedItems)
                {
                    _listBox.SelectedItems.Add(item);
                }

                SynchronizeSelectedItems(_listBox.SelectedItems);

                _preventSynchronization = false;
            }
        }

        private void _listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (!_preventSynchronization)
            {
                _preventSynchronization = true;

                _datagrid.SelectedItems.Clear();

                foreach (var item in _listBox.SelectedItems)
                {
                    _datagrid.SelectedItems.Add(item);
                }

                SynchronizeSelectedItems(_listBox.SelectedItems);

                _preventSynchronization = false;
            }
        }

        private void SynchronizeSelectedItems(IList items)
        {
            if (SelectedItems == null)
            {
                SelectedItems = items.Cast<FileSystemItem>().ToObservableCollection();
            }
            else
            {
                SelectedItems.Clear();

                foreach (var item in items.Cast<FileSystemItem>().ToList())
                {
                    SelectedItems.Add(item);
                }
            }
        }

        private void OnSelectedItemsChanged()
        {
            if (SelectedItems != null)
            {
                SelectedItems.CollectionChanged -= SelectedItems_CollectionChanged;
                SelectedItems.CollectionChanged += SelectedItems_CollectionChanged;
                SynchronizeControls();
            }
        }

        private void SelectedItems_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            SynchronizeControls();
        }

        private void SynchronizeControls()
        {
            if (_listBox == null) return;

            if (!_preventSynchronization)
            {
                _preventSynchronization = true;

                _listBox.SelectedItems.Clear();
                _datagrid.SelectedItems.Clear();

                foreach (var item in SelectedItems)
                {
                    _listBox.SelectedItems.Add(item);
                    _datagrid.SelectedItems.Add(item);
                }

                _preventSynchronization = false;
            }
        }

        protected override void OnDrop(DragEventArgs e)
        {
            base.OnDrop(e);

            try
            {
                string[] items = (string[])e.Data.GetData(DataFormats.FileDrop, false);

                if (items != null && items.Length > 0)
                {
                    List<FileSystemItem> fItems = new List<FileSystemItem>();

                    foreach (var item in items)
                    {
                        if (Directory.Exists(item))
                        {
                            fItems.Add(new FolderItem() { Path = item });
                        }
                        else if (File.Exists(item))
                        {
                            fItems.Add(new FileItem() { Path = item });
                        }
                    }

                    if (fItems.Count > 0)
                    {
                        DropCommand?.Execute(fItems);
                    }
                }
            }
            catch { } //Ignore
        }

        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            base.OnPreviewMouseLeftButtonDown(e);

            if (_isAfterContextMenu)
            {
                _isAfterContextMenu = false;
                return;
            }

            if (!AllowDrag) return;

            if (e.OriginalSource is FrameworkElement)
            {
                var listBoxItem = (e.OriginalSource as FrameworkElement).FindAncestor<ListBoxItem>();
                var dataGridRow = (e.OriginalSource as FrameworkElement).FindAncestor<DataGridRow>();
                if (listBoxItem == null && dataGridRow == null)
                {
                    return;
                }
            }

            _selectedItemsBeforeDrag.Clear();
            _selectedItemsBeforeDrag.AddRange(SelectedItems);
            _isMouseDown = true;
            AllowDrop = false;
            _dragOutStartPoint = e.GetPosition(null);
        }

        protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
        {
            base.OnPreviewMouseLeftButtonUp(e);
            AllowDrop = true;
            _isMouseDown = false;
        }

        protected async override void OnPreviewMouseMove(MouseEventArgs e)
        {
            base.OnPreviewMouseMove(e);

            if (_isMouseDown && !IsContextMenuOpened)
            {
                Point mpos = e.GetPosition(null);
                Vector diff = this._dragOutStartPoint - mpos;

                if (e.LeftButton == MouseButtonState.Pressed &&
                    Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
                    Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
                {
                    if (SelectedItems.Count == 0)
                    {
                        return;
                    }


                    SelectedItems.Clear();

                    foreach (var item in _selectedItemsBeforeDrag)
                    {
                        SelectedItems.Add(item);
                    }

                    List<Tuple<FileSystemItem, TemporaryFile>> dropItems = new List<Tuple<FileSystemItem, TemporaryFile>>();

                    foreach (var item in SelectedItems)
                    {
                        var tempFile = TemporaryManager.Default.CreateFile(".remote");
                        dropItems.Add(new Tuple<FileSystemItem, TemporaryFile>(item, tempFile));
                    }

                    List<DragItem> notifyItems = new List<DragItem>();

                    List<FileSystemWatcher> watchers = new List<FileSystemWatcher>();

                    FileSystemEventHandler handler = (x, args) =>
                    {
                        var detectedDropItem = dropItems.SingleOrDefault(y => y.Item2.FileName == System.IO.Path.GetFileName(args.FullPath));

                        Debug.WriteLine($"File Created: {args.FullPath}");

                        if (detectedDropItem != null)
                        {
                            try
                            {
                                detectedDropItem.Item2.Delete(); //Delete temp file.

                                if (File.Exists(args.FullPath))
                                {
                                    File.Delete(args.FullPath); //Delete dropped fake file.

                                    dropItems.Remove(detectedDropItem);

                                    notifyItems.Add(new DragItem()
                                    {
                                        FileSystemItem = detectedDropItem.Item1,
                                        Destination = System.IO.Path.GetDirectoryName(args.FullPath),
                                    });

                                    if (dropItems.Count == 0)
                                    {
                                        foreach (var watcher in watchers)
                                        {
                                            watcher.Dispose();
                                        }

                                        //Notify to user with all items!
                                        Dispatcher.BeginInvoke(new Action(() =>
                                        {
                                            DragCommand?.Execute(notifyItems);
                                        }));
                                    }
                                }
                            }
                            catch { }
                        }
                        else
                        {
                            Debug.WriteLine($"Not Found: {args.FullPath}");
                        }
                    };

                    foreach (var drive in DriveInfo.GetDrives().Where(x => x.IsReady && (x.DriveType == DriveType.Fixed || x.DriveType == DriveType.Removable)))
                    {
                        FileSystemWatcher watcher = new FileSystemWatcher(drive.RootDirectory.FullName, "*.remote");
                        watcher.IncludeSubdirectories = true;
                        watcher.EnableRaisingEvents = true;
                        watcher.Created += handler;
                        watchers.Add(watcher);
                    }

                    string[] files = dropItems.Select(x => x.Item2.Path).ToArray();

                    try
                    {
                        var ef = DragDrop.DoDragDrop(this, new DataObject(DataFormats.FileDrop, files, false), DragDropEffects.Copy);
                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine(ex);
                        Debugger.Break();
                    }

                    await Task.Delay(3000);

                    foreach (var watcher in watchers)
                    {
                        watcher.Dispose();
                    }

                    if (dropItems.Count > 0)
                    {
                        //Notify about problem!
                    }

                    _isMouseDown = false;
                    AllowDrop = true;
                }
            }
        }

        private async void OnCurrentItemChanged()
        {
            if (IsVisible)
            {
                await Task.Delay(100);
                this.Focus();
                Keyboard.Focus(this);
            }
        }
    }
}