using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using System.Windows.Forms;
using BookmarkManager;
using BookmarkManager.Models;
using bzit.bomg.Models;
using FizzyLauncher.Models;
using RyzStudio;
using RyzStudio.Windows.Forms;
using RyzStudio.Windows.TileForms;
using static System.Collections.Specialized.BitVector32;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace FizzyLauncher
{
    public partial class MainForm : Form
    {
        private readonly FileSessionManager _fileSessionManager;

        private bool _isBusy = false;


        public MainForm()
        {
            InitializeComponent();

            this.Text = Application.ProductName;

            _fileSessionManager = new FileSessionManager();
            _fileSessionManager.OpenFileDialog = openFileDialog1;
            _fileSessionManager.SaveFileDialog = saveFileDialog1;
            _fileSessionManager.OnNewing += fileSessionManager_OnNewSession;
            _fileSessionManager.OnLoading += fileSessionManager_OnLoadSession;
            _fileSessionManager.OnSaving += fileSessionManager_OnSaveSession;
            _fileSessionManager.OnClearing += fileSessionManager_OnClearSession;
            _fileSessionManager.OnFilenameChanged += fileSessionManager_OnFilenameChanged;

            this.AutoScaleMode = AutoScaleMode.None;
            this.StartPosition = FormStartPosition.WindowsDefaultLocation;

            treeView1.RootContextMenu = rootContextMenu;
            treeView1.FolderContextMenu = folderContextMenu;
            treeView1.PageContextMenu = pageContextMenu;
            treeView1.NodeMouseDoubleClick += treeView1_NodeMouseDoubleClick;
            treeView1.OnChanged += treeView1_OnChanged;
            treeView1.PreviewKeyDown += treeView1_PreviewKeyDown;
        }

        protected async override void OnShown(EventArgs e)
        {
            base.OnShown(e);

            var args = WinApplication.GetCommandLine();

            string jsonfigFilename = args.Where(x => (x.Key.Equals("o") || x.Key.Equals("open"))).Select(x => x.Value).FirstOrDefault();
            //if (string.IsNullOrWhiteSpace(jsonfigFilename))
            //{
            //    jsonfigFilename = Path.ChangeExtension(Application.ExecutablePath, "jsonfig");
            //}

            if (!string.IsNullOrWhiteSpace(jsonfigFilename) && File.Exists(jsonfigFilename))
            {
                await _fileSessionManager.OpenSession(jsonfigFilename);
            }
            else
            {
                this.CurrentSession = new AppOptions();

                InvalidateOptions();
            }
        }

        protected async override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);

            //if (this.CurrentSession == null)
            //{
            //    this.CurrentSession = new AppOptions();
            //}

            await _fileSessionManager.CloseSession();
        }

        public AppOptions CurrentSession { get; set; } = null;

        public bool IsBusy
        {
            get => _isBusy;
            set
            {
                treeView1.Enabled = !value;
            }
        }


        private void InvalidateOptions()
        {
            UIControl.SetTopMost(this, this.CurrentSession.AlwaysOnTop);
        }

        private void menuStrip1_MenuActivate(object sender, EventArgs e)
        {
            closeToolStripMenuItem.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);

            saveToolStripMenuItem.Enabled = (_fileSessionManager.SessionState == FileSessionManager.SessionStateEnum.Open);
            saveAsToolStripMenuItem.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);

            findToolStripMenuItem.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);

            collapseAllToolStripMenuItem.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);
            expandAllToolStripMenuItem.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);
            alwaysOnTopToolStripMenuItem.Checked = this.CurrentSession?.AlwaysOnTop ?? false;

            toolStripMenuItem9.Enabled = (_fileSessionManager.SessionState != FileSessionManager.SessionStateEnum.Close);
        }


        #region Main Menu

        /// <summary>
        /// New
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            await _fileSessionManager.NewSession();
        }

        /// <summary>
        /// Open file
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            await _fileSessionManager.OpenSession();
        }

        /// <summary>
        /// Close
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void closeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            await _fileSessionManager.CloseSession();
        }

        /// <summary>
        /// Save
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            await _fileSessionManager.SaveSession();
        }

        /// <summary>
        /// Save As
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            await _fileSessionManager.SaveAsSession();
        }

        /// <summary>
        /// Exit
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            this.Close();
        }


        /// <summary>
        /// Find
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void findToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //if (this.IsBusy)
            //{
            //    return;
            //}

            //var form = new FindForm(treeView1);
            //form.Show();
        }


        /// <summary>
        /// Expand all
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void expandAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            if (_fileSessionManager.SessionState == FileSessionManager.SessionStateEnum.Close)
            {
                return;
            }

            if (treeView1.SelectedNode == null)
            {
                treeView1.ExpandAll();
            }
            else
            {
                treeView1.SelectedNode.ExpandAll();
            }
        }

        /// <summary>
        /// Collapse all
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void collapseAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            if (_fileSessionManager.SessionState == FileSessionManager.SessionStateEnum.Close)
            {
                return;
            }

            if (treeView1.SelectedNode == null)
            {
                treeView1.CollapseAll();
            }
            else
            {
                treeView1.SelectedNode.Collapse(false);
            }
        }

        /// <summary>
        /// Always on top
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void alwaysOnTopToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.CurrentSession == null)
            {
                return;
            }

            this.CurrentSession.AlwaysOnTop = !this.CurrentSession.AlwaysOnTop;

            this.TopMost = this.CurrentSession.AlwaysOnTop;
        }


        /// <summary>
        /// Update icons
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem9_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            var form = new UpdateIconsForm(treeView1);
            form.ShowDialog();
        }

        /// <summary>
        /// Options
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void optionsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            var form = new OptionsForm(this.CurrentSession);
            if (form.ShowDialog() == DialogResult.OK)
            {
                this.CurrentSession = form.Result;

                InvalidateOptions();
            }
        }


        /// <summary>
        /// View help
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void viewHelpToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            RyzStudio.Diagnostics.Process.Execute(AppResource.AppHelpURL);
        }

        /// <summary>
        /// About
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void aboutToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            var form = new RyzStudio.Windows.ThemedForms.AboutForm();
            form.ProductURL = AppResource.AppProductURL;
            form.AuthorURL = AppResource.AppAuthorURL;
            form.CompanyURL = AppResource.AppCompanyURL;
            form.ProductCopyrightStartYear = 2012;
            //form.ProductLogo = AppResource.icon_64;

            form.ShowDialog();
        }

        #endregion

        #region Context Menu - Root

        /// <summary>
        /// Add page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addPageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            var nodeType = treeView1.GetNodeType();
            if ((nodeType == BookmarkTreeView.NodeType.Root) || (nodeType == BookmarkTreeView.NodeType.Folder))
            {
                treeView1.AddNode();
            }
        }

        /// <summary>
        /// Add folder
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addFolderToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            var nodeType = treeView1.GetNodeType();
            if ((nodeType == BookmarkTreeView.NodeType.Root) || (nodeType == BookmarkTreeView.NodeType.Folder))
            {
                treeView1.AddFolder();
            }
        }

        /// <summary>
        /// Edit root node
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void editToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            treeView1.EditNode();
        }

        /// <summary>
        /// Sort
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sortToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            treeView1.Sort();
        }

        #endregion

        #region Context Menu - Folder

        /// <summary>
        /// Add page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addPageToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            addPageToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Add folder
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addFolderToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            addFolderToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Open all pages
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void openAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            if (treeView1.SelectedNode == null)
            {
                return;
            }

            if (treeView1.SelectedNode.Nodes.Count <= 0)
            {
                return;
            }

            foreach (TreeNode item in treeView1.SelectedNode.Nodes)
            {
                await OpenBookmark(item);
            }
        }

        /// <summary>
        /// Edit folder name
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void editToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            editToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Delete folder
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            if (MessageBox.Show("Delete?", "Delete?", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                treeView1.DeleteNode();
            }
        }

        /// <summary>
        /// Sort children
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sortToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            sortToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Move up
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void moveUpToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            treeView1.MoveUp();
        }

        /// <summary>
        /// Move down
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void moveDownToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsBusy)
            {
                return;
            }

            treeView1.MoveDown();
        }

        #endregion

        #region Context Menu - Bookmark

        /// <summary>
        /// Open page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void openToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            await OpenBookmark(treeView1.SelectedNode);
        }

        /// <summary>
        /// Edit page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void editToolStripMenuItem2_Click(object sender, EventArgs e)
        {
            editToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Delete page
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void deleteToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            deleteToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Move up
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void moveUpToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            moveUpToolStripMenuItem_Click(sender, e);
        }

        /// <summary>
        /// Move down
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void moveDownToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            moveDownToolStripMenuItem_Click(sender, e);
        }

        #endregion


        #region File Session Manager

        private async Task<bool> fileSessionManager_OnNewSession(FileSessionManager sender)
        {
            return await Task.Run(() =>
            {
                treeView1.Clear("New Session");

                if (treeView1.Nodes.Count >= 0)
                {
                    UIControl.Invoke(treeView1, (x) =>
                    {
                        treeView1.Nodes[0].Expand();

                        treeView1.SelectedNode = treeView1.Nodes[0];
                    });
                }

                UIControl.SetFocus(treeView1);

                return true;
            });
        }

        private async Task<bool> fileSessionManager_OnLoadSession(FileSessionManager sender, string filename, int formatType)
        {
            return await Task.Run(async () =>
            {
                var result = GenericResult.Create();

                switch (Path.GetExtension(filename?.ToLower()?.Trim() ?? string.Empty))
                {
                    case ".json":
                        this.CurrentSession = RyzStudio.Text.Json.JsonSerialiser.DeserialiseFile<AppOptions>(filename);

                        if (this.CurrentSession == null)
                        {
                            this.CurrentSession = LoadR4SaveFile(filename);
                        }

                        break;
                    case ".jsnx":
                        this.CurrentSession = await RyzStudio.IO.Compression.ZFile.ReadFile<AppOptions>(filename, "Document.json");

                        // Load icons
                        this.CurrentSession = await LoadIconsFromZipFile(filename, this.CurrentSession);

                        break;
                    default:
                        this.CurrentSession = null;
                        break;
                }

                if (this.CurrentSession == null)
                {
                    MessageBox.Show("Unable to read session", "Load session");

                    return false;
                }

                if (this.CurrentSession == null)
                {
                    this.CurrentSession = new AppOptions();
                }

                // Reposition + resize
                if (!this.CurrentSession.StartPosition.IsEmpty)
                {
                    UIControl.SetLocation(this, this.CurrentSession.StartPosition);
                }

                if (this.CurrentSession.Height > 0)
                {
                    UIControl.SetHeight(this, this.CurrentSession.Height);
                }

                if (this.CurrentSession.Width > 0)
                {
                    UIControl.SetWidth(this, this.CurrentSession.Width);
                }

                InvalidateOptions();

                // Load items
                treeView1.Clear("New Session");

                foreach (var item in this.CurrentSession.Items ?? new List<BookmarkModel>())
                {
                    treeView1.AddNode(item);
                }

                if (treeView1.Nodes.Count >= 0)
                {
                    UIControl.Invoke(treeView1, (x) =>
                    {
                        treeView1.Nodes[0].Expand();

                        treeView1.SelectedNode = treeView1.Nodes[0];
                    });
                }

                UIControl.SetFocus(treeView1);

                return true;
            });
        }

        private async Task<bool> fileSessionManager_OnSaveSession(FileSessionManager sender, string filename, int formatType, bool showNotices)
        {
            if (string.IsNullOrWhiteSpace(filename))
            {
                return false;
            }

            return await Task.Run(async () =>
            {
                if (_isBusy)
                {
                    return false;
                }

                _isBusy = true;

                // update session
                if (this.CurrentSession == null)
                {
                    this.CurrentSession = new AppOptions();
                }

                this.CurrentSession.StartPosition = this.Location;
                this.CurrentSession.Width = this.Width;
                this.CurrentSession.Height = this.Height;

                var nodeList = treeView1.ToNodeList<BookmarkModel>() ?? new List<KeyValuePair<TreeNode, BookmarkModel>>();

                this.CurrentSession.Items = nodeList.Select(x => x.Value).ToList();

                var result = GenericResult.Create();

                switch (Path.GetExtension(filename?.ToLower()?.Trim() ?? string.Empty))
                {
                    case ".json":
                    case ".jsonfig":
                        result = RyzStudio.Text.Json.JsonSerialiser.SerialiseFile(filename, this.CurrentSession);
                        break;
                    case ".jsnx":
                        result = await RyzStudio.IO.Compression.ZFile.WriteFile(filename, "Document.json", this.CurrentSession);

                        if (result.IsSuccess)
                        {
                            // Add icons to save file
                            var result2 = AddImagesToZipFile(filename, this.CurrentSession.Items);
                            if (!result2.IsSuccess)
                            {
                                if (showNotices)
                                {
                                    MessageBox.Show("Unable to save icons", "Save session", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                }
                            }
                        }

                        break;
                    default:
                        result = GenericResult.Fault("Format not supported");
                        break;
                }

                if (result.IsSuccess)
                {
                    if (showNotices)
                    {
                        MessageBox.Show("Session saved!", "Save session", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                else
                {
                    if (showNotices)
                    {
                        MessageBox.Show(result.Message, "Save session");
                    }
                }

                _isBusy = false;

                return result.IsSuccess;
            });
        }

        private async Task<bool> fileSessionManager_OnClearSession(FileSessionManager sender)
        {
            return await Task.Run(() =>
            {
                UIControl.Clear(treeView1);

                return true;
            });
        }

        private async Task fileSessionManager_OnFilenameChanged(FileSessionManager sender, string filename)
        {
            await Task.Run(() =>
            {
                switch (sender.SessionState)
                {
                    case FileSessionManager.SessionStateEnum.New:
                        UIControl.SetText(this, "New Session - " + Application.ProductName);
                        break;
                    case FileSessionManager.SessionStateEnum.Open:
                        UIControl.SetText(this, Path.GetFileNameWithoutExtension(filename) + " - " + Application.ProductName);
                        break;
                    case FileSessionManager.SessionStateEnum.Close:
                        UIControl.SetText(this, Application.ProductName);
                        break;
                    default:
                        break;
                }
            });
        }

        #endregion

        private async void treeView1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            TreeNode node = treeView1.SelectedNode;
            if (node == null)
            {
                return;
            }

            BookmarkTreeView.NodeType nodeType = treeView1.GetNodeType();

            switch (e.KeyCode)
            {
                case Keys.Enter:
                    await OpenBookmark(node);
                    break;
                default:
                    break;
            }
        }

        private async void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            await OpenBookmark(e.Node);
        }

        private void treeView1_OnChanged(object sender, EventArgs e)
        {
            if (treeView1.HasChanged)
            {
                _fileSessionManager.HasChanged = treeView1.HasChanged;
            }
        }


        private AppOptions LoadR4SaveFile(string filename)
        {
            var session = RyzStudio.Text.Json.JsonSerialiser.DeserialiseFile<List<R4SaveFileModel>>(filename);
            if (session == null)
            {
                return null;
            }

            var result = new AppOptions();
            result.Items = new List<BookmarkModel>();

            foreach (var item in session)
            {
                result.Items.Add(new BookmarkModel()
                {
                    Title = item.SiteName,
                    Address = item.SiteAddress,
                    Description = item.SiteDescription,
                    Notes = item.Notes,
                    Path = item.Path
                });
            }

            return result;
        }

        private async Task<AppOptions> LoadIconsFromZipFile(string filename, AppOptions session)
        {
            if (string.IsNullOrWhiteSpace(filename))
            {
                return session;
            }

            return await Task.Run(() =>
            {
                try
                {
                    using (var archive = ZipFile.Open(filename, ZipArchiveMode.Read))
                    {
                        foreach (var item in session.Items)
                        {
                            if (item.Id == Guid.Empty)
                            {
                                continue;
                            }

                            var key = "icon\\" + item.Id.ToString() + ".png";

                            var zipEntry = archive.GetEntry(key);
                            if (zipEntry == null)
                            {
                                continue;
                            }

                            using (Stream entryStream = zipEntry.Open())
                            {
                                item.Icon = Image.FromStream(entryStream);
                            }
                        }
                    }
                }
                catch (Exception)
                {
                    // do nothing
                }

                return session;
            });
        }

        private async Task OpenBookmark(TreeNode node)
        {
            await Task.Run(() =>
            {
                if (treeView1.GetNodeType(node) != BookmarkTreeView.NodeType.Page)
                {
                    return;
                }

                var model = UIControl.GetTag<BookmarkModel>(node);
                if (model == null)
                {
                    return;
                }

                if (string.IsNullOrWhiteSpace(model.Address))
                {
                    return;
                }

                string cmd = (string.IsNullOrWhiteSpace(CurrentSession.RunCommand) ? model.Address : CurrentSession.RunCommand.Replace("{0}", model.Address));

                RyzStudio.Diagnostics.Process.Execute(cmd);
            });
        }

        private GenericResult AddImagesToZipFile(string zipFilename, List<BookmarkModel> items)
        {
            if (string.IsNullOrWhiteSpace(zipFilename))
            {
                return GenericResult.Fault("Filename is blank");
            }

            var path = Path.GetDirectoryName(zipFilename);
            if (!System.IO.Directory.Exists(path))
            {
                try
                {
                    System.IO.Directory.CreateDirectory(path);
                }
                catch (Exception exc)
                {
                    return GenericResult.Fault(exc.Message);
                }
            }

            var options = RyzStudio.Text.Json.JsonSerialiser.GetPreferredOptions();

            try
            {
                using (var archive = ZipFile.Open(zipFilename, ZipArchiveMode.Update))
                {
                    foreach (var item in items)
                    {
                        if (item.Icon == null)
                        {
                            continue;
                        }

                        var key = "icon\\" + item.Id.ToString() + ".png";
                        var zipEntry = archive.GetEntry(key);
                        if (zipEntry != null)
                        {
                            zipEntry.Delete();
                        }

                        zipEntry = archive.CreateEntry(key, CompressionLevel.SmallestSize);

                        using (Stream entryStream = zipEntry.Open())
                        {
                            using (Image image = item.Icon)
                            {
                                image.Save(entryStream, ImageFormat.Png);
                            }
                        }

                    }
                }
            }
            catch (Exception exc)
            {
                return GenericResult.Fault(exc.Message);
            }

            return GenericResult.Create();
        }

    }
}