using System.Reactive.Disposables;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Controls.Notifications;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.ReactiveUI;
using Avalonia.Threading;
using DialogHostAvalonia;
using MsBox.Avalonia.Enums;
using ReactiveUI;
using Splat;
using v2rayN.Desktop.Common;
using v2rayN.Desktop.Handler;

namespace v2rayN.Desktop.Views;

public partial class MainWindow : ReactiveWindow<MainWindowViewModel>
{
    private static Config _config;
    private WindowNotificationManager? _manager;
    private CheckUpdateView? _checkUpdateView;
    private BackupAndRestoreView? _backupAndRestoreView;
    private bool _blCloseByUser = false;

    public MainWindow()
    {
        InitializeComponent();

        _config = AppHandler.Instance.Config;
        _manager = new WindowNotificationManager(TopLevel.GetTopLevel(this)) { MaxItems = 3, Position = NotificationPosition.BottomRight };

        this.KeyDown += MainWindow_KeyDown;
        menuSettingsSetUWP.Click += menuSettingsSetUWP_Click;
        menuPromotion.Click += menuPromotion_Click;
        menuCheckUpdate.Click += MenuCheckUpdate_Click;
        menuBackupAndRestore.Click += MenuBackupAndRestore_Click;
        menuClose.Click += MenuClose_Click;

        MessageBus.Current.Listen<string>(EMsgCommand.SendSnackMsg.ToString()).Subscribe(DelegateSnackMsg);
        ViewModel = new MainWindowViewModel(UpdateViewHandler);
        Locator.CurrentMutable.RegisterLazySingleton(() => ViewModel, typeof(MainWindowViewModel));

        switch (_config.UiItem.MainGirdOrientation)
        {
            case EGirdOrientation.Horizontal:
                tabProfiles.Content ??= new ProfilesView(this);
                tabMsgView.Content ??= new MsgView();
                tabClashProxies.Content ??= new ClashProxiesView();
                tabClashConnections.Content ??= new ClashConnectionsView();
                gridMain.IsVisible = true;
                break;

            case EGirdOrientation.Vertical:
                tabProfiles1.Content ??= new ProfilesView(this);
                tabMsgView1.Content ??= new MsgView();
                tabClashProxies1.Content ??= new ClashProxiesView();
                tabClashConnections1.Content ??= new ClashConnectionsView();
                gridMain1.IsVisible = true;
                break;

            case EGirdOrientation.Tab:
            default:
                tabProfiles2.Content ??= new ProfilesView(this);
                tabMsgView2.Content ??= new MsgView();
                tabClashProxies2.Content ??= new ClashProxiesView();
                tabClashConnections2.Content ??= new ClashConnectionsView();
                gridMain2.IsVisible = true;
                break;
        }
        conTheme.Content ??= new ThemeSettingView();

        this.WhenActivated(disposables =>
        {
            //servers
            this.BindCommand(ViewModel, vm => vm.AddVmessServerCmd, v => v.menuAddVmessServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddVlessServerCmd, v => v.menuAddVlessServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddShadowsocksServerCmd, v => v.menuAddShadowsocksServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddSocksServerCmd, v => v.menuAddSocksServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddHttpServerCmd, v => v.menuAddHttpServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddTrojanServerCmd, v => v.menuAddTrojanServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddHysteria2ServerCmd, v => v.menuAddHysteria2Server).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddTuicServerCmd, v => v.menuAddTuicServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddWireguardServerCmd, v => v.menuAddWireguardServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddAnytlsServerCmd, v => v.menuAddAnytlsServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddCustomServerCmd, v => v.menuAddCustomServer).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddServerViaClipboardCmd, v => v.menuAddServerViaClipboard).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddServerViaScanCmd, v => v.menuAddServerViaScan).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.AddServerViaImageCmd, v => v.menuAddServerViaImage).DisposeWith(disposables);

            //sub
            this.BindCommand(ViewModel, vm => vm.SubSettingCmd, v => v.menuSubSetting).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.SubUpdateCmd, v => v.menuSubUpdate).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.SubUpdateViaProxyCmd, v => v.menuSubUpdateViaProxy).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.SubGroupUpdateCmd, v => v.menuSubGroupUpdate).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.SubGroupUpdateViaProxyCmd, v => v.menuSubGroupUpdateViaProxy).DisposeWith(disposables);

            //setting
            this.BindCommand(ViewModel, vm => vm.OptionSettingCmd, v => v.menuOptionSetting).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.RoutingSettingCmd, v => v.menuRoutingSetting).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.DNSSettingCmd, v => v.menuDNSSetting).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.GlobalHotkeySettingCmd, v => v.menuGlobalHotkeySetting).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.RebootAsAdminCmd, v => v.menuRebootAsAdmin).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.ClearServerStatisticsCmd, v => v.menuClearServerStatistics).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.OpenTheFileLocationCmd, v => v.menuOpenTheFileLocation).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.RegionalPresetDefaultCmd, v => v.menuRegionalPresetsDefault).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.RegionalPresetRussiaCmd, v => v.menuRegionalPresetsRussia).DisposeWith(disposables);
            this.BindCommand(ViewModel, vm => vm.RegionalPresetIranCmd, v => v.menuRegionalPresetsIran).DisposeWith(disposables);

            this.BindCommand(ViewModel, vm => vm.ReloadCmd, v => v.menuReload).DisposeWith(disposables);
            this.OneWayBind(ViewModel, vm => vm.BlReloadEnabled, v => v.menuReload.IsEnabled).DisposeWith(disposables);

            switch (_config.UiItem.MainGirdOrientation)
            {
                case EGirdOrientation.Horizontal:
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabMsgView.IsVisible).DisposeWith(disposables);
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashProxies.IsVisible).DisposeWith(disposables);
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections.IsVisible).DisposeWith(disposables);
                    this.Bind(ViewModel, vm => vm.TabMainSelectedIndex, v => v.tabMain.SelectedIndex).DisposeWith(disposables);
                    break;

                case EGirdOrientation.Vertical:
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabMsgView1.IsVisible).DisposeWith(disposables);
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashProxies1.IsVisible).DisposeWith(disposables);
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections1.IsVisible).DisposeWith(disposables);
                    this.Bind(ViewModel, vm => vm.TabMainSelectedIndex, v => v.tabMain1.SelectedIndex).DisposeWith(disposables);
                    break;

                case EGirdOrientation.Tab:
                default:
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashProxies2.IsVisible).DisposeWith(disposables);
                    this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections2.IsVisible).DisposeWith(disposables);
                    this.Bind(ViewModel, vm => vm.TabMainSelectedIndex, v => v.tabMain2.SelectedIndex).DisposeWith(disposables);
                    break;
            }
        });

        this.Title = $"{Utils.GetVersion()}";
        if (Utils.IsWindows())
        {
            ThreadPool.RegisterWaitForSingleObject(Program.ProgramStarted, OnProgramStarted, null, -1, false);
            HotkeyHandler.Instance.Init(_config, OnHotkeyHandler);
        }
        else
        {
            if (AppHandler.Instance.IsAdministrator)
            {
                this.Title = $"{Utils.GetVersion()} - {ResUI.TbSettingsLinuxSudoPasswordNotSudoRunApp}";
                NoticeHandler.Instance.SendMessageAndEnqueue(ResUI.TbSettingsLinuxSudoPasswordNotSudoRunApp);
            }
            menuRebootAsAdmin.IsVisible = false;
            menuSettingsSetUWP.IsVisible = false;
            menuGlobalHotkeySetting.IsVisible = false;
        }
        menuAddServerViaScan.IsVisible = false;

        RestoreUI();
        AddHelpMenuItem();
        MessageBus.Current.Listen<string>(EMsgCommand.AppExit.ToString()).Subscribe(StorageUI);
    }

    #region Event

    private void OnProgramStarted(object state, bool timeout)
    {
        Dispatcher.UIThread.Post(() =>
                ShowHideWindow(true),
            DispatcherPriority.Default);
    }

    private void DelegateSnackMsg(string content)
    {
        Dispatcher.UIThread.Post(() =>
                   _manager?.Show(new Notification(null, content, NotificationType.Information)),
        DispatcherPriority.Normal);
    }

    private async Task<bool> UpdateViewHandler(EViewAction action, object? obj)
    {
        switch (action)
        {
            case EViewAction.AddServerWindow:
                if (obj is null)
                    return false;
                return await new AddServerWindow((ProfileItem)obj).ShowDialog<bool>(this);

            case EViewAction.AddServer2Window:
                if (obj is null)
                    return false;
                return await new AddServer2Window((ProfileItem)obj).ShowDialog<bool>(this);

            case EViewAction.DNSSettingWindow:
                return await new DNSSettingWindow().ShowDialog<bool>(this);

            case EViewAction.RoutingSettingWindow:
                return await new RoutingSettingWindow().ShowDialog<bool>(this);

            case EViewAction.OptionSettingWindow:
                return await new OptionSettingWindow().ShowDialog<bool>(this);

            case EViewAction.GlobalHotkeySettingWindow:
                return await new GlobalHotkeySettingWindow().ShowDialog<bool>(this);

            case EViewAction.SubSettingWindow:
                return await new SubSettingWindow().ShowDialog<bool>(this);

            case EViewAction.ShowHideWindow:
                Dispatcher.UIThread.Post(() =>
                    ShowHideWindow((bool?)obj),
                DispatcherPriority.Default);
                break;

            case EViewAction.DispatcherStatistics:
                if (obj is null)
                    return false;
                Dispatcher.UIThread.Post(() =>
                    ViewModel?.SetStatisticsResult((ServerSpeedItem)obj),
                DispatcherPriority.Default);
                break;

            case EViewAction.DispatcherReload:
                Dispatcher.UIThread.Post(() =>
                    ViewModel?.ReloadResult(),
                DispatcherPriority.Default);
                break;

            case EViewAction.Shutdown:
                if (obj != null && _blCloseByUser == false)
                {
                    _blCloseByUser = (bool)obj;
                }
                StorageUI();
                if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
                {
                    HotkeyHandler.Instance.Dispose();
                    desktop.Shutdown();
                }
                break;

            case EViewAction.ScanScreenTask:
                await ScanScreenTaskAsync();
                break;

            case EViewAction.ScanImageTask:
                await ScanImageTaskAsync();
                break;

            case EViewAction.AddServerViaClipboard:
                var clipboardData = await AvaUtils.GetClipboardData(this);
                if (clipboardData.IsNotEmpty() && ViewModel != null)
                {
                    await ViewModel.AddServerViaClipboardAsync(clipboardData);
                }
                break;

            case EViewAction.AdjustMainLvColWidth:
                Dispatcher.UIThread.Post(() =>
                   Locator.Current.GetService<ProfilesViewModel>()?.AutofitColumnWidthAsync(),
                    DispatcherPriority.Default);
                break;
        }

        return await Task.FromResult(true);
    }

    private void OnHotkeyHandler(EGlobalHotkey e)
    {
        switch (e)
        {
            case EGlobalHotkey.ShowForm:
                ShowHideWindow(null);
                break;

            case EGlobalHotkey.SystemProxyClear:
            case EGlobalHotkey.SystemProxySet:
            case EGlobalHotkey.SystemProxyUnchanged:
            case EGlobalHotkey.SystemProxyPac:
                Locator.Current.GetService<StatusBarViewModel>()?.SetListenerType((ESysProxyType)((int)e - 1));
                break;
        }
    }

    protected override async void OnClosing(WindowClosingEventArgs e)
    {
        if (_blCloseByUser)
        {
            return;
        }

        Logging.SaveLog("OnClosing -> " + e.CloseReason.ToString());

        switch (e.CloseReason)
        {
            case WindowCloseReason.OwnerWindowClosing or WindowCloseReason.WindowClosing:
                e.Cancel = true;
                ShowHideWindow(false);
                break;

            case WindowCloseReason.ApplicationShutdown or WindowCloseReason.OSShutdown:
                if (ViewModel != null)
                {
                    await ViewModel.MyAppExitAsync(true);
                }
                break;
        }

        base.OnClosing(e);
    }

    private async void MainWindow_KeyDown(object? sender, KeyEventArgs e)
    {
        if (e.KeyModifiers is KeyModifiers.Control or KeyModifiers.Meta)
        {
            switch (e.Key)
            {
                case Key.V:
                    var clipboardData = await AvaUtils.GetClipboardData(this);
                    if (clipboardData.IsNotEmpty() && ViewModel != null)
                    {
                        await ViewModel.AddServerViaClipboardAsync(clipboardData);
                    }
                    break;

                case Key.S:
                    await ScanScreenTaskAsync();
                    break;
            }
        }
        else
        {
            if (e.Key == Key.F5)
            {
                ViewModel?.Reload();
            }
        }
    }

    private void menuPromotion_Click(object? sender, RoutedEventArgs e)
    {
        ProcUtils.ProcessStart($"{Utils.Base64Decode(Global.PromotionUrl)}?t={DateTime.Now.Ticks}");
    }

    private void menuSettingsSetUWP_Click(object? sender, RoutedEventArgs e)
    {
        ProcUtils.ProcessStart(Utils.GetBinPath("EnableLoopback.exe"));
    }

    public async Task ScanScreenTaskAsync()
    {
        //ShowHideWindow(false);

        NoticeHandler.Instance.SendMessageAndEnqueue("Not yet implemented.(还未实现)");
        await Task.CompletedTask;
        //if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        //{
        //    //var bytes = QRCodeHelper.CaptureScreen(desktop);
        //    //await ViewModel?.ScanScreenResult(bytes);
        //}

        //ShowHideWindow(true);
    }

    private async Task ScanImageTaskAsync()
    {
        var fileName = await UI.OpenFileDialog(this, null);
        if (fileName.IsNullOrEmpty())
        {
            return;
        }

        if (ViewModel != null)
        {
            await ViewModel.ScanImageResult(fileName);
        }
    }

    private void MenuCheckUpdate_Click(object? sender, RoutedEventArgs e)
    {
        _checkUpdateView ??= new CheckUpdateView();
        DialogHost.Show(_checkUpdateView);
    }

    private void MenuBackupAndRestore_Click(object? sender, RoutedEventArgs e)
    {
        _backupAndRestoreView ??= new BackupAndRestoreView(this);
        DialogHost.Show(_backupAndRestoreView);
    }

    private async void MenuClose_Click(object? sender, RoutedEventArgs e)
    {
        if (await UI.ShowYesNo(this, ResUI.menuExitTips) == ButtonResult.No)
        {
            return;
        }

        _blCloseByUser = true;
        StorageUI();
        if (ViewModel != null)
        {
            await ViewModel.MyAppExitAsync(false);
        }
    }

    #endregion Event

    #region UI

    public void ShowHideWindow(bool? blShow)
    {
        var bl = blShow ?? (!_config.UiItem.ShowInTaskbar ^ (WindowState == WindowState.Minimized));
        if (bl)
        {
            this.Show();
            if (this.WindowState == WindowState.Minimized)
            {
                this.WindowState = WindowState.Normal;
            }
            this.Activate();
            this.Focus();
        }
        else
        {
            if (Utils.IsLinux() && _config.UiItem.Hide2TrayWhenClose == false)
            {
                this.WindowState = WindowState.Minimized;
                return;
            }

            foreach (var ownedWindow in this.OwnedWindows)
            {
                ownedWindow.Close();
            }
            this.Hide();
        }

        _config.UiItem.ShowInTaskbar = bl;
    }

    private void RestoreUI()
    {
        if (_config.UiItem.MainWidth > 0 && _config.UiItem.MainHeight > 0)
        {
            Width = _config.UiItem.MainWidth;
            Height = _config.UiItem.MainHeight;
        }

        if (_config.UiItem.MainGirdHeight1 > 0 && _config.UiItem.MainGirdHeight2 > 0)
        {
            if (_config.UiItem.MainGirdOrientation == EGirdOrientation.Horizontal)
            {
                gridMain.ColumnDefinitions[0].Width = new GridLength(_config.UiItem.MainGirdHeight1, GridUnitType.Star);
                gridMain.ColumnDefinitions[2].Width = new GridLength(_config.UiItem.MainGirdHeight2, GridUnitType.Star);
            }
            else if (_config.UiItem.MainGirdOrientation == EGirdOrientation.Vertical)
            {
                gridMain1.RowDefinitions[0].Height = new GridLength(_config.UiItem.MainGirdHeight1, GridUnitType.Star);
                gridMain1.RowDefinitions[2].Height = new GridLength(_config.UiItem.MainGirdHeight2, GridUnitType.Star);
            }
        }
    }

    private void StorageUI(string? n = null)
    {
        _config.UiItem.MainWidth = this.Width;
        _config.UiItem.MainHeight = this.Height;

        if (_config.UiItem.MainGirdOrientation == EGirdOrientation.Horizontal)
        {
            _config.UiItem.MainGirdHeight1 = Math.Ceiling(gridMain.ColumnDefinitions[0].ActualWidth + 0.1);
            _config.UiItem.MainGirdHeight2 = Math.Ceiling(gridMain.ColumnDefinitions[2].ActualWidth + 0.1);
        }
        else if (_config.UiItem.MainGirdOrientation == EGirdOrientation.Vertical)
        {
            _config.UiItem.MainGirdHeight1 = Math.Ceiling(gridMain1.RowDefinitions[0].ActualHeight + 0.1);
            _config.UiItem.MainGirdHeight2 = Math.Ceiling(gridMain1.RowDefinitions[2].ActualHeight + 0.1);
        }
    }

    private void AddHelpMenuItem()
    {
        var coreInfo = CoreInfoHandler.Instance.GetCoreInfo();
        foreach (var it in coreInfo
            .Where(t => t.CoreType != ECoreType.v2fly
                        && t.CoreType != ECoreType.hysteria))
        {
            var item = new MenuItem()
            {
                Tag = it.Url?.Replace(@"/releases", ""),
                Header = string.Format(ResUI.menuWebsiteItem, it.CoreType.ToString().Replace("_", " ")).UpperFirstChar()
            };
            item.Click += MenuItem_Click;
            menuHelp.Items.Add(item);
        }
    }

    private void MenuItem_Click(object? sender, RoutedEventArgs e)
    {
        if (sender is MenuItem item)
        {
            ProcUtils.ProcessStart(item.Tag?.ToString());
        }
    }

    #endregion UI
}