using System.ComponentModel;
using System.Reactive.Disposables;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Threading;
using MaterialDesignThemes.Wpf;
using ReactiveUI;
using Splat;
using v2rayN.Handler;

namespace v2rayN.Views
{
    public partial class MainWindow
    {
        private static Config _config;
        private CheckUpdateView? _checkUpdateView;
        private BackupAndRestoreView? _backupAndRestoreView;

        public MainWindow()
        {
            InitializeComponent();

            _config = AppHandler.Instance.Config;
            ThreadPool.RegisterWaitForSingleObject(App.ProgramStarted, OnProgramStarted, null, -1, false);

            App.Current.SessionEnding += Current_SessionEnding;
            this.Closing += MainWindow_Closing;
            this.PreviewKeyDown += MainWindow_PreviewKeyDown;
            menuSettingsSetUWP.Click += menuSettingsSetUWP_Click;
            menuPromotion.Click += menuPromotion_Click;
            menuClose.Click += menuClose_Click;
            menuCheckUpdate.Click += MenuCheckUpdate_Click;
            menuBackupAndRestore.Click += MenuBackupAndRestore_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();
                    tabMsgView.Content ??= new MsgView();
                    tabClashProxies.Content ??= new ClashProxiesView();
                    tabClashConnections.Content ??= new ClashConnectionsView();
                    gridMain.Visibility = Visibility.Visible;
                    break;

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

                case EGirdOrientation.Tab:
                default:
                    tabProfiles2.Content ??= new ProfilesView();
                    tabMsgView2.Content ??= new MsgView();
                    tabClashProxies2.Content ??= new ClashProxiesView();
                    tabClashConnections2.Content ??= new ClashConnectionsView();
                    gridMain2.Visibility = Visibility.Visible;
                    break;
            }
            pbTheme.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.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.Visibility).DisposeWith(disposables);
                        this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashProxies.Visibility).DisposeWith(disposables);
                        this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections.Visibility).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.Visibility).DisposeWith(disposables);
                        this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashProxies1.Visibility).DisposeWith(disposables);
                        this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections1.Visibility).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.Visibility).DisposeWith(disposables);
                        this.OneWayBind(ViewModel, vm => vm.ShowClashUI, v => v.tabClashConnections2.Visibility).DisposeWith(disposables);
                        this.Bind(ViewModel, vm => vm.TabMainSelectedIndex, v => v.tabMain2.SelectedIndex).DisposeWith(disposables);
                        break;
                }
            });

            this.Title = $"{Utils.GetVersion()} - {(AppHandler.Instance.IsAdministrator ? ResUI.RunAsAdmin : ResUI.NotRunAsAdmin)}";

            if (!_config.GuiItem.EnableHWA)
            {
                RenderOptions.ProcessRenderMode = RenderMode.SoftwareOnly;
            }

            RestoreUI();
            AddHelpMenuItem();
            WindowsHandler.Instance.RegisterGlobalHotkey(_config, OnHotkeyHandler, null);
            MessageBus.Current.Listen<string>(EMsgCommand.AppExit.ToString()).Subscribe(StorageUI);
        }

        #region Event

        private void OnProgramStarted(object state, bool timeout)
        {
            Application.Current?.Dispatcher.Invoke((Action)(() =>
            {
                ShowHideWindow(true);
            }));
        }

        private void DelegateSnackMsg(string content)
        {
            Application.Current?.Dispatcher.Invoke((() =>
            {
                MainSnackbar.MessageQueue?.Enqueue(content);
            }), DispatcherPriority.Normal);
        }

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

                case EViewAction.AddServer2Window:
                    if (obj is null)
                        return false;
                    return (new AddServer2Window((ProfileItem)obj)).ShowDialog() ?? false;

                case EViewAction.DNSSettingWindow:
                    return (new DNSSettingWindow().ShowDialog() ?? false);

                case EViewAction.RoutingSettingWindow:
                    return (new RoutingSettingWindow().ShowDialog() ?? false);

                case EViewAction.OptionSettingWindow:
                    return (new OptionSettingWindow().ShowDialog() ?? false);

                case EViewAction.GlobalHotkeySettingWindow:
                    return (new GlobalHotkeySettingWindow().ShowDialog() ?? false);

                case EViewAction.SubSettingWindow:
                    return (new SubSettingWindow().ShowDialog() ?? false);

                case EViewAction.ShowHideWindow:
                    Application.Current?.Dispatcher.Invoke((() =>
                    {
                        ShowHideWindow((bool?)obj);
                    }), DispatcherPriority.Normal);
                    break;

                case EViewAction.DispatcherStatistics:
                    if (obj is null)
                        return false;
                    Application.Current?.Dispatcher.Invoke((() =>
                    {
                        ViewModel?.SetStatisticsResult((ServerSpeedItem)obj);
                    }), DispatcherPriority.Normal);
                    break;

                case EViewAction.DispatcherReload:
                    Application.Current?.Dispatcher.Invoke((() =>
                    {
                        ViewModel?.ReloadResult();
                    }), DispatcherPriority.Normal);
                    break;

                case EViewAction.Shutdown:
                    Application.Current?.Dispatcher.Invoke((() =>
                    {
                        Application.Current.Shutdown();
                    }), DispatcherPriority.Normal);
                    break;

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

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

                case EViewAction.AddServerViaClipboard:
                    var clipboardData = WindowsUtils.GetClipboardData();
                    ViewModel?.AddServerViaClipboardAsync(clipboardData);
                    break;

                case EViewAction.AdjustMainLvColWidth:
                    Application.Current?.Dispatcher.Invoke((() =>
                    {
                        Locator.Current.GetService<ProfilesViewModel>()?.AutofitColumnWidthAsync();
                    }), DispatcherPriority.Normal);
                    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;
            }
        }

        private void MainWindow_Closing(object? sender, CancelEventArgs e)
        {
            e.Cancel = true;
            ShowHideWindow(false);
        }

        private async void Current_SessionEnding(object sender, SessionEndingCancelEventArgs e)
        {
            Logging.SaveLog("Current_SessionEnding");
            StorageUI();
            await ViewModel?.MyAppExitAsync(true);
        }

        private void MainWindow_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                switch (e.Key)
                {
                    case Key.V:
                        if (Keyboard.FocusedElement is TextBox)
                            return;
                        var clipboardData = WindowsUtils.GetClipboardData();
                        var service = Locator.Current.GetService<MainWindowViewModel>();
                        if (service != null)
                            _ = service.AddServerViaClipboardAsync(clipboardData);
                        break;

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

        private void menuClose_Click(object sender, RoutedEventArgs e)
        {
            StorageUI();
            ShowHideWindow(false);
        }

        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"));
        }

        private async Task ScanScreenTaskAsync()
        {
            ShowHideWindow(false);

            if (Application.Current?.MainWindow is Window window)
            {
                var bytes = QRCodeHelper.CaptureScreen(window);
                await ViewModel?.ScanScreenResult(bytes);
            }

            ShowHideWindow(true);
        }

        private async Task ScanImageTaskAsync()
        {
            if (UI.OpenFileDialog(out var fileName, "PNG|*.png|All|*.*") != true)
            {
                return;
            }
            if (fileName.IsNullOrEmpty())
            {
                return;
            }
            await ViewModel?.ScanImageResult(fileName);
        }

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

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

        #endregion Event

        #region UI

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

            var maxWidth = SystemParameters.WorkArea.Width;
            var maxHeight = SystemParameters.WorkArea.Height;
            if (Width > maxWidth)
                Width = maxWidth;
            if (Height > maxHeight)
                Height = maxHeight;
            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 = Utils.ToInt(this.Width);
            _config.UiItem.MainHeight = Utils.ToInt(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
    }
}
