// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : frmMain.xeto.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Main window.
//
// --[ Description ] ----------------------------------------------------------
//
//     Implements main GUI window.
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General public License for more details.
//
//     You should have received a copy of the GNU General public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Console;
using DiscImageChef.Core;
using DiscImageChef.Core.Media.Info;
using DiscImageChef.Database;
using DiscImageChef.Decoders.SCSI;
using DiscImageChef.Devices;
using DiscImageChef.Gui.Dialogs;
using DiscImageChef.Gui.Panels;
using DiscImageChef.Settings;
using Eto.Drawing;
using Eto.Forms;
using Eto.Serialization.Xaml;
using FileAttributes = DiscImageChef.CommonTypes.Structs.FileAttributes;
using ImageFormat = DiscImageChef.Core.ImageFormat;

namespace DiscImageChef.Gui.Forms
{
    public class frmMain : Form
    {
        bool     closing;
        Bitmap   devicesIcon;
        Bitmap   ejectIcon;
        GridView grdFiles;
        Bitmap   hardDiskIcon;
        Bitmap   imagesIcon;
        Label    lblError;
        /// <summary>
        ///     This is to remember that column is an image to be set in future
        /// </summary>
        Image nullImage;
        Bitmap                 opticalIcon;
        TreeGridItem           placeholderItem;
        Bitmap                 removableIcon;
        Bitmap                 sdIcon;
        Bitmap                 tapeIcon;
        TreeGridView           treeImages;
        TreeGridItemCollection treeImagesItems;
        ContextMenu            treeImagesMenu;
        Bitmap                 usbIcon;

        public frmMain(bool debug, bool verbose)
        {
            XamlReader.Load(this);

            lblError  = new Label();
            grdFiles  = new GridView();
            nullImage = null;

            ConsoleHandler.Init();
            ConsoleHandler.Debug   = debug;
            ConsoleHandler.Verbose = verbose;

            treeImagesItems = new TreeGridItemCollection();

            treeImages.Columns.Add(new GridColumn {HeaderText = "Name", DataCell = new ImageTextCell(0, 1)});

            treeImages.AllowMultipleSelection = false;
            treeImages.ShowHeader             = false;
            treeImages.DataStore              = treeImagesItems;

            // TODO: SVG
            imagesIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.inode-directory.png"));
            devicesIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.computer.png"));
            hardDiskIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.drive-harddisk.png"));
            opticalIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.drive-optical.png"));
            usbIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.drive-removable-media-usb.png"));
            removableIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.drive-removable-media.png"));
            sdIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.media-flash-sd-mmc.png"));
            tapeIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.media-tape.png"));
            ejectIcon =
                new Bitmap(ResourceHandler
                              .GetResourceStream("DiscImageChef.Gui.Assets.Icons.oxygen._32x32.media-eject.png"));

            imagesRoot  = new TreeGridItem {Values = new object[] {imagesIcon, "Images"}};
            devicesRoot = new TreeGridItem {Values = new object[] {devicesIcon, "Devices"}};

            treeImagesItems.Add(imagesRoot);
            treeImagesItems.Add(devicesRoot);

            placeholderItem = new TreeGridItem {Values = new object[] {nullImage, "You should not be seeing this"}};

            Closing += OnClosing;

            treeImagesMenu         =  new ContextMenu();
            treeImagesMenu.Opening += OnTreeImagesMenuOpening;
            treeImages.ContextMenu =  treeImagesMenu;
        }

        void OnTreeImagesMenuOpening(object sender, EventArgs e)
        {
            OnTreeImagesSelectedItemChanged(treeImages, e);

            treeImagesMenu.Items.Clear();
            ButtonMenuItem menuItem = new ButtonMenuItem {Text = "Close all images"};
            menuItem.Click += CloseAllImages;
            treeImagesMenu.Items.Add(menuItem);
            menuItem       =  new ButtonMenuItem {Text = "Refresh devices"};
            menuItem.Click += OnDeviceRefresh;
            treeImagesMenu.Items.Add(menuItem);

            if(!(treeImages.SelectedItem is TreeGridItem selectedItem)) return;

            if(selectedItem.Values.Length < 4) return;

            if(selectedItem.Values[3] is pnlImageInfo imageInfo)
            {
                IMediaImage image = selectedItem.Values[5] as IMediaImage;

                // TODO: Global pool of forms
                treeImagesMenu.Items.Add(new SeparatorMenuItem());

                menuItem       =  new ButtonMenuItem {Text = "Calculate entropy"};
                menuItem.Click += (a, b) => { new frmImageEntropy(image).Show(); };
                treeImagesMenu.Items.Add(menuItem);
                menuItem       =  new ButtonMenuItem {Text = "Verify"};
                menuItem.Click += (a, b) => { new frmImageVerify(image).Show(); };
                treeImagesMenu.Items.Add(menuItem);
                menuItem       =  new ButtonMenuItem {Text = "Checksum"};
                menuItem.Click += (a, b) => { new frmImageChecksum(image).Show(); };
                treeImagesMenu.Items.Add(menuItem);
                menuItem       =  new ButtonMenuItem {Text = "Convert to..."};
                menuItem.Click += (a, b) => { new frmImageConvert(image, selectedItem.Values[2] as string).Show(); };
                treeImagesMenu.Items.Add(menuItem);
                menuItem = new ButtonMenuItem {Text = "Create CICM XML sidecar..."};
                menuItem.Click += (a, b) =>
                {
                    // TODO: Pass thru chosen default encoding
                    new frmImageSidecar(image, selectedItem.Values[2] as string, ((IFilter)selectedItem.Values[4]).Id,
                                        null).Show();
                };
                treeImagesMenu.Items.Add(menuItem);
                menuItem       =  new ButtonMenuItem {Text = "View sectors"};
                menuItem.Click += (a, b) => { new frmPrintHex(image).Show(); };
                treeImagesMenu.Items.Add(menuItem);

                if(!image.Info.ReadableMediaTags.Any()) return;

                menuItem       =  new ButtonMenuItem {Text = "Decode media tags"};
                menuItem.Click += (a, b) => { new frmDecodeMediaTags(image).Show(); };
                treeImagesMenu.Items.Add(menuItem);
            }
        }

        void CloseAllImages(object sender, EventArgs eventArgs)
        {
            // TODO
            MessageBox.Show("Not yet implemented");
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if(Settings.Settings.Current.GdprCompliance < DicSettings.GdprLevel) new dlgSettings(true).ShowModal(this);
        }

        void OnClosing(object sender, CancelEventArgs e)
        {
            // This prevents an infinite loop of crashes :p
            if(closing) return;

            closing = true;
            Application.Instance.Quit();
        }

        protected void OnMenuOpen(object sender, EventArgs e)
        {
            // TODO: Extensions
            OpenFileDialog dlgOpenImage = new OpenFileDialog {Title = "Choose image to open"};

            DialogResult result = dlgOpenImage.ShowDialog(this);
            if(result != DialogResult.Ok) return;

            FiltersList filtersList = new FiltersList();
            IFilter     inputFilter = filtersList.GetFilter(dlgOpenImage.FileName);

            if(inputFilter == null)
            {
                MessageBox.Show("Cannot open specified file.", MessageBoxType.Error);
                return;
            }

            try
            {
                IMediaImage imageFormat = ImageFormat.Detect(inputFilter);

                if(imageFormat == null)
                {
                    MessageBox.Show("Image format not identified.", MessageBoxType.Error);
                    return;
                }

                DicConsole.WriteLine("Image format identified by {0} ({1}).", imageFormat.Name, imageFormat.Id);

                try
                {
                    if(!imageFormat.Open(inputFilter))
                    {
                        MessageBox.Show("Unable to open image format", MessageBoxType.Error);
                        DicConsole.ErrorWriteLine("Unable to open image format");
                        DicConsole.ErrorWriteLine("No error given");
                        return;
                    }

                    // TODO: SVG
                    Stream logo =
                        ResourceHandler
                           .GetResourceStream($"DiscImageChef.Gui.Assets.Logos.Media.{imageFormat.Info.MediaType}.png");

                    TreeGridItem imageGridItem = new TreeGridItem
                    {
                        Values = new object[]
                        {
                            logo == null ? null : new Bitmap(logo),
                            $"{Path.GetFileName(dlgOpenImage.FileName)} ({imageFormat.Info.MediaType})",
                            dlgOpenImage.FileName,
                            new pnlImageInfo(dlgOpenImage.FileName, inputFilter, imageFormat), inputFilter,
                            imageFormat
                        }
                    };

                    List<Partition> partitions = Core.Partitions.GetAll(imageFormat);
                    Core.Partitions.AddSchemesToStats(partitions);

                    bool         checkraw = false;
                    List<string> idPlugins;
                    IFilesystem  plugin;
                    PluginBase   plugins = GetPluginBase.Instance;

                    if(partitions.Count == 0)
                    {
                        DicConsole.DebugWriteLine("Analyze command", "No partitions found");

                        checkraw = true;
                    }
                    else
                    {
                        DicConsole.WriteLine("{0} partitions found.", partitions.Count);

                        foreach(string scheme in partitions.Select(p => p.Scheme).Distinct().OrderBy(s => s))
                        {
                            TreeGridItem schemeGridItem = new TreeGridItem
                            {
                                Values = new object[]
                                {
                                    nullImage, // TODO: Add icons to partition schemes
                                    scheme
                                }
                            };

                            foreach(Partition partition in partitions
                                                          .Where(p => p.Scheme == scheme).OrderBy(p => p.Start))
                            {
                                TreeGridItem partitionGridItem = new TreeGridItem
                                {
                                    Values = new object[]
                                    {
                                        nullImage, // TODO: Add icons to partition schemes
                                        $"{partition.Name} ({partition.Type})", null, new pnlPartition(partition)
                                    }
                                };

                                DicConsole.WriteLine("Identifying filesystem on partition");

                                Core.Filesystems.Identify(imageFormat, out idPlugins, partition);
                                if(idPlugins.Count == 0) DicConsole.WriteLine("Filesystem not identified");
                                else
                                {
                                    DicConsole.WriteLine($"Identified by {idPlugins.Count} plugins");

                                    foreach(string pluginName in idPlugins)
                                        if(plugins.PluginsList.TryGetValue(pluginName, out plugin))
                                        {
                                            plugin.GetInformation(imageFormat, partition, out string information, null);

                                            IReadOnlyFilesystem fsPlugin = plugin as IReadOnlyFilesystem;

                                            if(fsPlugin != null)
                                            {
                                                Errno error =
                                                    fsPlugin.Mount(imageFormat, partition, null,
                                                                   new Dictionary<string, string>());

                                                if(error != Errno.NoError) fsPlugin = null;
                                            }

                                            TreeGridItem filesystemGridItem = new TreeGridItem
                                            {
                                                Values = new object[]
                                                {
                                                    nullImage, // TODO: Add icons to filesystems
                                                    plugin.XmlFsType.VolumeName is null
                                                        ? $"{plugin.XmlFsType.Type}"
                                                        : $"{plugin.XmlFsType.VolumeName} ({plugin.XmlFsType.Type})",
                                                    fsPlugin, new pnlFilesystem(plugin.XmlFsType, information)
                                                }
                                            };

                                            if(fsPlugin != null)
                                            {
                                                Statistics.AddCommand("ls");
                                                filesystemGridItem.Children.Add(placeholderItem);
                                            }

                                            Statistics.AddFilesystem(plugin.XmlFsType.Type);
                                            partitionGridItem.Children.Add(filesystemGridItem);
                                        }
                                }

                                schemeGridItem.Children.Add(partitionGridItem);
                            }

                            imageGridItem.Children.Add(schemeGridItem);
                        }
                    }

                    if(checkraw)
                    {
                        Partition wholePart = new Partition
                        {
                            Name   = "Whole device",
                            Length = imageFormat.Info.Sectors,
                            Size   = imageFormat.Info.Sectors * imageFormat.Info.SectorSize
                        };

                        Core.Filesystems.Identify(imageFormat, out idPlugins, wholePart);
                        if(idPlugins.Count == 0) DicConsole.WriteLine("Filesystem not identified");
                        else
                        {
                            DicConsole.WriteLine($"Identified by {idPlugins.Count} plugins");

                            foreach(string pluginName in idPlugins)
                                if(plugins.PluginsList.TryGetValue(pluginName, out plugin))
                                {
                                    plugin.GetInformation(imageFormat, wholePart, out string information, null);

                                    IReadOnlyFilesystem fsPlugin = plugin as IReadOnlyFilesystem;

                                    if(fsPlugin != null)
                                    {
                                        Errno error =
                                            fsPlugin.Mount(imageFormat, wholePart, null,
                                                           new Dictionary<string, string>());

                                        if(error != Errno.NoError) fsPlugin = null;
                                    }

                                    TreeGridItem filesystemGridItem = new TreeGridItem
                                    {
                                        Values = new object[]
                                        {
                                            nullImage, // TODO: Add icons to filesystems
                                            plugin.XmlFsType.VolumeName is null
                                                ? $"{plugin.XmlFsType.Type}"
                                                : $"{plugin.XmlFsType.VolumeName} ({plugin.XmlFsType.Type})",
                                            fsPlugin, new pnlFilesystem(plugin.XmlFsType, information)
                                        }
                                    };

                                    if(fsPlugin != null)
                                    {
                                        Statistics.AddCommand("ls");
                                        filesystemGridItem.Children.Add(placeholderItem);
                                    }

                                    Statistics.AddFilesystem(plugin.XmlFsType.Type);
                                    imageGridItem.Children.Add(filesystemGridItem);
                                }
                        }
                    }

                    imagesRoot.Children.Add(imageGridItem);
                    treeImages.ReloadData();

                    Statistics.AddMediaFormat(imageFormat.Format);
                    Statistics.AddMedia(imageFormat.Info.MediaType, false);
                    Statistics.AddFilter(inputFilter.Name);
                }
                catch(Exception ex)
                {
                    MessageBox.Show("Unable to open image format", MessageBoxType.Error);
                    DicConsole.ErrorWriteLine("Unable to open image format");
                    DicConsole.ErrorWriteLine("Error: {0}", ex.Message);
                    DicConsole.DebugWriteLine("Image-info command", "Stack trace: {0}", ex.StackTrace);
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show("Exception reading file", MessageBoxType.Error);
                DicConsole.ErrorWriteLine($"Error reading file: {ex.Message}");
                DicConsole.DebugWriteLine("Image-info command", ex.StackTrace);
            }

            Statistics.AddCommand("image-info");
        }

        protected void OnMenuAbout(object sender, EventArgs e)
        {
            AboutDialog dlgAbout = new AboutDialog
            {
                Developers = new[] {"Natalia Portillo", "Michael Drüing"},
                License = "This program is free software: you can redistribute it and/or modify\n" +
                          "it under the terms of the GNU General public License as\n"              +
                          "published by the Free Software Foundation, either version 3 of the\n"   +
                          "License, or (at your option) any later version.\n\n"                    +
                          "This program is distributed in the hope that it will be useful,\n"      +
                          "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"       +
                          "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"        +
                          "GNU General public License for more details.\n\n"                       +
                          "You should have received a copy of the GNU General public License\n"    +
                          "along with this program.  If not, see <http://www.gnu.org/licenses/>.",
                ProgramName  = "The Disc Image Chef",
                Website      = new Uri("https://github.com/claunia"),
                WebsiteLabel = "Source code on..."
            };
            dlgAbout.ShowDialog(this);
        }

        protected void OnMenuQuit(object sender, EventArgs e)
        {
            Application.Instance.Quit();
        }

        protected void OnDeviceRefresh(object sender, EventArgs e)
        {
            RefreshDevices();
        }

        protected void OnMenuSettings(object sender, EventArgs e)
        {
            new dlgSettings(false).ShowModal(this);
        }

        protected override void OnLoadComplete(EventArgs e)
        {
            base.OnLoadComplete(e);

            RefreshDevices();
        }

        void RefreshDevices()
        {
            try
            {
                DicConsole.WriteLine("Refreshing devices");
                devicesRoot.Children.Clear();

                foreach(DeviceInfo device in Device.ListDevices().Where(d => d.Supported).OrderBy(d => d.Vendor)
                                                   .ThenBy(d => d.Model))
                {
                    DicConsole.DebugWriteLine("Main window",
                                              "Found supported device model {0} by manufacturer {1} on bus {2} and path {3}",
                                              device.Model, device.Vendor, device.Bus, device.Path);

                    TreeGridItem devItem = new TreeGridItem
                    {
                        Values = new object[]
                        {
                            hardDiskIcon, $"{device.Vendor} {device.Model} ({device.Bus})", device.Path, null
                        }
                    };

                    try
                    {
                        Device dev = new Device(device.Path);

                        switch(dev.Type)
                        {
                            case DeviceType.ATAPI:
                            case DeviceType.SCSI:
                                switch(dev.ScsiType)
                                {
                                    case PeripheralDeviceTypes.DirectAccess:
                                    case PeripheralDeviceTypes.SCSIZonedBlockDevice:
                                    case PeripheralDeviceTypes.SimplifiedDevice:
                                        devItem.Values[0] = dev.IsRemovable
                                                                ? dev.IsUsb
                                                                      ? usbIcon
                                                                      : removableIcon
                                                                : hardDiskIcon;
                                        break;
                                    case PeripheralDeviceTypes.SequentialAccess:
                                        devItem.Values[0] = tapeIcon;
                                        break;
                                    case PeripheralDeviceTypes.OpticalDevice:
                                    case PeripheralDeviceTypes.WriteOnceDevice:
                                    case PeripheralDeviceTypes.OCRWDevice:
                                        devItem.Values[0] = removableIcon;
                                        break;
                                    case PeripheralDeviceTypes.MultiMediaDevice:
                                        devItem.Values[0] = opticalIcon;
                                        break;
                                }

                                break;
                            case DeviceType.SecureDigital:
                            case DeviceType.MMC:
                                devItem.Values[0] = sdIcon;
                                break;
                            case DeviceType.NVMe:
                                devItem.Values[0] = nullImage;
                                break;
                        }

                        dev.Close();
                    }
                    catch
                    {
                        // ignored
                    }

                    devItem.Children.Add(placeholderItem);
                    devicesRoot.Children.Add(devItem);
                }

                treeImages.ReloadData();
            }
            catch(InvalidOperationException ex) { DicConsole.ErrorWriteLine(ex.Message); }
        }

        protected void OnMenuConsole(object sender, EventArgs e)
        {
            new frmConsole().Show();
        }

        protected void OnMenuPlugins(object sender, EventArgs e)
        {
            new dlgPlugins().ShowModal(this);
        }

        protected void OnMenuEncodings(object sender, EventArgs e)
        {
            new dlgEncodings().ShowModal(this);
        }

        protected void OnMenuBenchmark(object sender, EventArgs e)
        {
            new dlgBenchmark().ShowModal(this);
        }

        protected void OnMenuStatistics(object sender, EventArgs e)
        {
            DicContext ctx = DicContext.Create(Settings.Settings.DbPath);

            if(!ctx.Commands.Any() && !ctx.Filesystems.Any() && !ctx.Filters.Any() && !ctx.MediaFormats.Any() &&
               !ctx.Medias.Any()   && !ctx.Partitions.Any()  && !ctx.SeenDevices.Any())
            {
                MessageBox.Show("There are no statistics.");
                return;
            }

            new dlgStatistics().ShowModal(this);
        }

        protected void OnTreeImagesSelectedItemChanged(object sender, EventArgs e)
        {
            if(!(sender is TreeGridView tree)) return;

            if(!(tree.SelectedItem is TreeGridItem selectedItem)) return;

            splMain.Panel2 = null;

            if(selectedItem.Values.Length >= 4 && selectedItem.Values[3] is Panel infoPanel)
            {
                splMain.Panel2 = infoPanel;
                return;
            }

            if(selectedItem.Values.Length < 4) return;

            switch(selectedItem.Values[3])
            {
                case null when selectedItem.Parent == devicesRoot:
                    try
                    {
                        Device dev = new Device((string)selectedItem.Values[2]);
                        if(dev.Error)
                        {
                            selectedItem.Values[3] = $"Error {dev.LastError} opening device";
                            return;
                        }

                        Core.Devices.Info.DeviceInfo devInfo = new Core.Devices.Info.DeviceInfo(dev);

                        selectedItem.Values[3] = new pnlDeviceInfo(devInfo);
                        splMain.Panel2         = (Panel)selectedItem.Values[3];

                        dev.Close();
                    }
                    catch(SystemException ex)
                    {
                        selectedItem.Values[3] = ex.Message;
                        lblError.Text          = ex.Message;
                        splMain.Panel2         = lblError;
                        DicConsole.ErrorWriteLine(ex.Message);
                    }

                    break;
                case string devErrorMessage when selectedItem.Parent == devicesRoot:
                    lblError.Text  = devErrorMessage;
                    splMain.Panel2 = lblError;
                    break;
                case Dictionary<string, FileEntryInfo> files:
                    splMain.Panel2 = new pnlListFiles(selectedItem.Values[2] as IReadOnlyFilesystem, files,
                                                      selectedItem.Values[1] as string == "/"
                                                          ? "/"
                                                          : selectedItem.Values[4] as string);
                    break;
            }
        }

        protected void OnTreeImagesItemExpanding(object sender, TreeGridViewItemCancelEventArgs e)
        {
            // First expansion of a device
            if((e.Item as TreeGridItem)?.Children?.Count != 1 ||
               ((TreeGridItem)e.Item).Children[0]        != placeholderItem) return;

            if(((TreeGridItem)e.Item).Parent == devicesRoot)
            {
                TreeGridItem deviceItem = (TreeGridItem)e.Item;

                deviceItem.Children.Clear();
                Device dev;
                try
                {
                    dev = new Device((string)deviceItem.Values[2]);
                    if(dev.Error)
                    {
                        deviceItem.Values[3] = $"Error {dev.LastError} opening device";
                        e.Cancel             = true;
                        treeImages.ReloadData();
                        treeImages.SelectedItem = deviceItem;
                        return;
                    }
                }
                catch(SystemException ex)
                {
                    deviceItem.Values[3] = ex.Message;
                    e.Cancel             = true;
                    treeImages.ReloadData();
                    DicConsole.ErrorWriteLine(ex.Message);
                    treeImages.SelectedItem = deviceItem;
                    return;
                }

                if(!dev.IsRemovable)
                    deviceItem.Children.Add(new TreeGridItem
                    {
                        Values = new object[]
                        {
                            nullImage,
                            "Non-removable device commands not yet implemented"
                        }
                    });
                else
                {
                    // TODO: Removable non-SCSI?
                    ScsiInfo scsiInfo = new ScsiInfo(dev);

                    if(!scsiInfo.MediaInserted)
                        deviceItem.Children.Add(new TreeGridItem
                        {
                            Values = new object[] {ejectIcon, "No media inserted"}
                        });
                    else
                    {
                        // TODO: SVG
                        Stream logo =
                            ResourceHandler
                               .GetResourceStream($"DiscImageChef.Gui.Assets.Logos.Media.{scsiInfo.MediaType}.png");

                        deviceItem.Children.Add(new TreeGridItem
                        {
                            Values = new[]
                            {
                                logo == null ? null : new Bitmap(logo),
                                scsiInfo.MediaType, deviceItem.Values[2],
                                new pnlScsiInfo(scsiInfo, (string)deviceItem.Values[2])
                            }
                        });
                    }
                }

                dev.Close();
            }
            else if(((TreeGridItem)e.Item).Values[2] is IReadOnlyFilesystem fsPlugin)
            {
                TreeGridItem fsItem = (TreeGridItem)e.Item;

                fsItem.Children.Clear();

                if(fsItem.Values.Length == 5 && fsItem.Values[4] is string dirPath)
                {
                    Errno errno = fsPlugin.ReadDir(dirPath, out List<string> dirents);

                    if(errno != Errno.NoError)
                    {
                        MessageBox.Show($"Error {errno} trying to read \"{dirPath}\" of chosen filesystem",
                                        MessageBoxType.Error);
                        return;
                    }

                    Dictionary<string, FileEntryInfo> files       = new Dictionary<string, FileEntryInfo>();
                    List<string>                      directories = new List<string>();

                    foreach(string dirent in dirents)
                    {
                        errno = fsPlugin.Stat(dirPath + "/" + dirent, out FileEntryInfo stat);

                        if(errno != Errno.NoError)
                        {
                            DicConsole
                               .ErrorWriteLine($"Error {errno} trying to get information about filesystem entry named {dirent}");
                            continue;
                        }

                        if(stat.Attributes.HasFlag(FileAttributes.Directory)) directories.Add(dirent);
                        else files.Add(dirent, stat);
                    }

                    foreach(string directory in directories)
                    {
                        TreeGridItem dirItem = new TreeGridItem
                        {
                            Values = new object[] {imagesIcon, directory, fsPlugin, null, dirPath + "/" + directory}
                        };

                        dirItem.Children.Add(placeholderItem);
                        fsItem.Children.Add(dirItem);
                    }
                }
                else
                {
                    Errno errno = fsPlugin.ReadDir("/", out List<string> dirents);

                    if(errno != Errno.NoError)
                    {
                        MessageBox.Show($"Error {errno} trying to read root directory of chosen filesystem",
                                        MessageBoxType.Error);
                        return;
                    }

                    Dictionary<string, FileEntryInfo> files       = new Dictionary<string, FileEntryInfo>();
                    List<string>                      directories = new List<string>();

                    foreach(string dirent in dirents)
                    {
                        errno = fsPlugin.Stat("/" + dirent, out FileEntryInfo stat);

                        if(errno != Errno.NoError)
                        {
                            DicConsole
                               .ErrorWriteLine($"Error {errno} trying to get information about filesystem entry named {dirent}");
                            continue;
                        }

                        if(stat.Attributes.HasFlag(FileAttributes.Directory)) directories.Add(dirent);
                        else files.Add(dirent, stat);
                    }

                    TreeGridItem rootDirectoryItem = new TreeGridItem
                    {
                        Values = new object[]
                        {
                            nullImage, // TODO: Get icon from volume
                            "/", fsPlugin, files
                        }
                    };

                    foreach(string directory in directories)
                    {
                        TreeGridItem dirItem = new TreeGridItem
                        {
                            Values = new object[] {imagesIcon, directory, fsPlugin, null, "/" + directory}
                        };

                        dirItem.Children.Add(placeholderItem);
                        rootDirectoryItem.Children.Add(dirItem);
                    }

                    fsItem.Children.Add(rootDirectoryItem);
                }
            }
        }

        #region XAML IDs
        TreeGridItem devicesRoot;
        TreeGridItem imagesRoot;
        Splitter     splMain;
        #endregion
    }
}