using System.Collections.ObjectModel;
using System.Net.Http.Headers;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using Microsoft.Web.WebView2.Core;
using VideoDownloader.Browser;
using VideoDownloader.App.Browser;
using VideoDownloader.App.Browser.Features;
using VideoDownloader.Browser.Tabs;
using VideoDownloader.App.Core;
using VideoDownloader.Core.Detection;
using VideoDownloader.App.ViewModels;
using VideoDownloader.Core.Config;
using Wv2 = Microsoft.Web.WebView2.Wpf;
using TabItem = VideoDownloader.Browser.Tabs.TabItem;

namespace VideoDownloader.App;

public partial class MainWindow : Window
{
    private readonly DownloadManager _manager;
    private AppConfig _config;
    private int _totalRequests;
    private string _appLogPath = "";

    // ---- 탭 아키텍처 (Phase A) ----
    private CoreWebView2Environment? _env;
    private TabManager _tabs = null!;
    internal TabManager Tabs => _tabs;
    internal Wv2.WebView2? ActiveView => _tabs?.ActiveTab?.View;
    private CoreWebView2? Cv => _tabs?.ActiveTab?.Core;

    private readonly ObservableCollection<Bookmark> _bookmarks = new();
    private readonly ObservableCollection<HistoryEntry> _history = new();
    private bool _suggesting; // 주소창 인라인 자동완성 도중 (TextChanged 재귀 방지)

    // Phase C: 팔레트/부스트/워크스페이스/레이아웃
    private readonly CommandPalette _palette = new();
    private BoostStore _boostStore = null!;
    private List<WorkspaceSnapshot> _workspaces = new();
    private bool _verticalTabs;
    private TabItem? _splitTab;
    private System.Speech.Synthesis.SpeechSynthesizer? _speech;

    // Phase B: 다운로드 매니저(T1-5) / 탭 절전(T2-2)
    private readonly PageDownloadTracker _pageDownloads = new();
    private System.Windows.Threading.DispatcherTimer? _speedTimer;
    private System.Windows.Threading.DispatcherTimer? _suspendTimer;
    private TabSuspendService? _suspendService;
    private readonly System.Diagnostics.Stopwatch _speedWatch = new();

    // T1-4 검색엔진 / T1-7 사이트별 줌 / T1-3 페이지 내 검색 / T1-11 전체화면
    private SearchEngineResolver _resolver = null!;
    private SiteZoomStore _zoomStore = null!;
    private bool _fullscreen;
    private WindowState _stateBeforeFullscreen = WindowState.Normal;

    // #15 위장 미디어(image/png 등) magic byte 검증용. 세션당 상한 두어 폭주 방지.
    private static readonly HttpClient ProbeClient = new(new HttpClientHandler { AllowAutoRedirect = true })
    { Timeout = TimeSpan.FromSeconds(15) };
    private readonly HashSet<string> _probed = new();
    private int _probeCount;

    // 범용 우측 패널: 접기/펼치기 + 폭 리사이즈 상태(설정에 저장)
    private bool _panelCollapsed;
    private double _panelExpandedWidth = 420;
    private const double CollapsedPanelWidth = 56;
    private const double MinExpandedWidth = 280;
    private const double MaxExpandedWidth = 900;

    private static string SessionPath => Path.Combine(AppDataDir, "session.json");

    public MainWindow()
    {
        InitializeComponent();
        _config = ConfigStore.Load();
        Directory.CreateDirectory(_config.OutputFolder);
        _appLogPath = Path.Combine(_config.OutputFolder, "app.log");
        try { File.WriteAllText(_appLogPath, $"=== 시작 {DateTime.Now:yyyy-MM-dd HH:mm:ss} ==={Environment.NewLine}"); } catch { }
        _manager = new DownloadManager(_config, GetCookiesAsync, Log);
        DataContext = _manager;

        foreach (var b in BrowserStore.LoadBookmarks()) _bookmarks.Add(b);
        foreach (var h in BrowserStore.LoadHistory()) _history.Add(h);
        BookmarksList.ItemsSource = _bookmarks;
        HistoryList.ItemsSource = _history;

        _resolver = new SearchEngineResolver(_config.SearchEngine);
        _zoomStore = new SiteZoomStore(Path.Combine(AppDataDir, "sitezoom.json"));
        _boostStore = new BoostStore(Path.Combine(AppDataDir, "boost.json"));
        try
        {
            var wsPath = Path.Combine(AppDataDir, "workspaces.json");
            if (File.Exists(wsPath))
                _workspaces = System.Text.Json.JsonSerializer.Deserialize<List<WorkspaceSnapshot>>(File.ReadAllText(wsPath)) ?? new();
        }
        catch { }
        BuildPalette();

        Loaded += async (_, _) => await InitializeBrowserAsync();
        PreviewKeyDown += OnPreviewKeyDown;
        StateChanged += OnWindowStateChanged;
        AddressBox.LostKeyboardFocus += (_, _) => AddressPopup.IsOpen = false;

        // 범용 우측 패널: 저장된 접힘/폭 상태 복원
        _panelExpandedWidth = ClampPanelWidth(_config.RightPanelWidth);
        ApplyPanelState(_config.RightPanelCollapsed);
        Closing += OnWindowClosing;
    }

    // 보더리스: Win11 어두운 타이틀바 + 둥근 모서리(DWMWA_WINDOW_CORNER_PREFERENCE)
    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);
        try
        {
            var hwnd = new WindowInteropHelper(this).Handle;
            int dark = App.IsLightTheme ? 0 : 1; // DWMWA_USE_IMMERSIVE_DARK_MODE (라이트 테마면 밝게)
            DwmSetWindowAttribute(hwnd, 20, ref dark, sizeof(int));
            int round = 2; // DWMWCP_ROUND
            DwmSetWindowAttribute(hwnd, 33, ref round, sizeof(int));
        }
        catch { }
    }

    private void OnWindowStateChanged(object? sender, EventArgs e)
    {
        // 최대화 시 모서리 각진(Fluent 표준), 복원 시 둥글게. 캡션 아이콘도 전환.
        try
        {
            var hwnd = new WindowInteropHelper(this).Handle;
            int pref = WindowState == WindowState.Maximized ? 0 : 2; // 0=기본(최대화 시 사각)
            DwmSetWindowAttribute(hwnd, 33, ref pref, sizeof(int));
            if (MaxRestoreBtn != null)
            {
                MaxRestoreBtn.Content = WindowState == WindowState.Maximized ? "" : "";
                MaxRestoreBtn.ToolTip = WindowState == WindowState.Maximized ? "복원" : "최대화";
            }
        }
        catch { }
    }

    // ---- 보더리스: 툴바의 빈 공간을 드래그 (버튼/입력창 위는 제외해 클릭 전달) ----
    private void TitleBar_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        // 더블클릭 → 최대화/복원 (네이티브 타이틀바 동작)
        if (e.ClickCount >= 2) { MaximizeToggle(); return; }

        // 클릭된 대상(또는 조상)이 버튼/입력창이면 드래그하지 않고 클릭을 그대로 흘려보낸다
        for (var d = e.OriginalSource as DependencyObject; d != null; d = LogicalTreeHelper.GetParent(d) ?? VisualTreeHelper.GetParent(d))
        {
            if (d is ButtonBase || d is TextBox) return;
        }
        if (e.LeftButton == MouseButtonState.Pressed) { try { DragMove(); } catch { } }
    }

    private void Minimize_Click(object sender, RoutedEventArgs e) => WindowState = WindowState.Minimized;
    private void MaxRestore_Click(object sender, RoutedEventArgs e) => MaximizeToggle();
    private void Close_Click(object sender, RoutedEventArgs e) => Close();

    private void MaximizeToggle()
        => WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;

    [DllImport("dwmapi.dll")]
    private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attribute, ref int pvAttribute, int cbAttribute);

    /// <summary>앱 데이터 디렉터리(AppPaths.DataDir — VD_DATA_DIR 오버라이드 지원).</summary>
    internal static string AppDataDir => AppPaths.DataDir;

    internal static string ProfileFolder => Path.Combine(AppDataDir, "webview");

    // ==================== 탭 생명주기 (Phase A) ====================

    private async Task InitializeBrowserAsync()
    {
        try
        {
            // 명시적 영속 프로필: 기본(exe 디렉터리) 폴더는 빌드/재배포 시 날아가 로그인이 풀림 → %AppData% 로 고정.
            Directory.CreateDirectory(ProfileFolder);
            _env = await CoreWebView2Environment.CreateAsync(browserExecutableFolder: null, userDataFolder: ProfileFolder);
        }
        catch (Exception ex) { Log($"WebView2 초기화 실패: {ex.Message}"); return; }

        _views = new Services.TabViewService(_env!, _config, TabHost, _zoomStore, Dispatcher)
        {
            NewTabProvider = () => Task.FromResult(_tabs.NewTab(activate: false)),
        };
        _views.TabCoreReady += (_, cv) => cv.WebResourceResponseReceived += OnResponseReceived; // 미디어 감지
        _views.DownloadStarting += OnDownloadStarting;
        _views.UrlChanged += OnUrlChanged;
        _views.TitleChanged += OnTitleChanged;
        _views.HistoryChanged += UpdateNavState;
        _views.FindStateChanged += tab =>
        {
            if (tab.FindSession != null) FindStatus.Text = tab.FindSession.StatusText;
        };

        _views.ContextMenuBuild += OnContextMenuBuild;
        _views.BoostScriptProvider = url => BoostCssBuilder.BuildScript(url, _boostStore.Get(url)); // T2-7
        _views.GlanceRequested += (_, link) => Dispatcher.BeginInvoke(new Action(() => OpenGlance(link))); // T2-6
        _views.SpeakRequested += (_, text) => Dispatcher.BeginInvoke(new Action(() => SpeakText(text))); // T3-9

        _views.ContextMenuBuild += OnContextMenuBuild;
        _views.BoostScriptProvider = url => BoostCssBuilder.BuildScript(url, _boostStore.Get(url)); // T2-7
        _views.GlanceRequested += (_, link) => Dispatcher.BeginInvoke(new Action(() => OpenGlance(link))); // T2-6
        _views.SpeakRequested += (_, text) => Dispatcher.BeginInvoke(new Action(() => SpeakText(text))); // T3-9

        _tabs = new TabManager(() => new TabItem(), _views.AttachView);
        _tabs.ActiveChanged += OnActiveTabChanged;
        _tabs.TabRemoved += OnTabRemoved;
        TabList.ItemsSource = _tabs.Tabs;
        UpdatePrivateButton();

        // T1-10 세션 복원: 저장된 탭이 있으면 복원, 아니면 홈 탭
        var snap = _config.RestoreSession ? TabSessionStore.Load(SessionPath) : null;
        if (snap != null && snap.Urls.Count > 0)
            _tabs.RestoreSession(snap);
        else
            _tabs.NewTab(_config.HomeUrl);
        UpdateNavState();

        // T1-5 다운로드 속도 갱신 타이머
        DownloadsList.ItemsSource = _pageDownloads.Items;
        _speedTimer = new System.Windows.Threading.DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
        _speedTimer.Tick += (_, _) =>
        {
            foreach (var item in _pageDownloads.Items)
                item.UpdateSpeed(item.Op.BytesReceived, TimeSpan.FromSeconds(1));
            DownloadsEmptyHint.Visibility = _pageDownloads.Items.Count == 0 ? Visibility.Visible : Visibility.Collapsed;
        };
        _speedTimer.Start();

        // T2-2 탭 절전: 1분마다 유휴(10분+) 비활성 탭 서스펜드
        _suspendService = new TabSuspendService(TimeSpan.FromMinutes(10), tab =>
        {
            var cv = tab.Core;
            if (cv == null || cv.IsSuspended) return false;
            if (tab.View?.Visibility != Visibility.Collapsed) return false; // 숨겨진 탭만 서스펜드 가능
            _ = cv.TrySuspendAsync();
            return true;
        }, tab => tab.Core != null);
        _suspendTimer = new System.Windows.Threading.DispatcherTimer { Interval = TimeSpan.FromMinutes(1) };
        _suspendTimer.Tick += (_, _) =>
        {
            if (_tabs.ActiveTab != null)
                _suspendService.SuspendIdleTabs(_tabs.Tabs, _tabs.ActiveTab, DateTime.UtcNow);
        };
        _suspendTimer.Start();
    }

    /// <summary>탭별 WebView2 생명주기·배선 전담 서비스(재구성 ④).</summary>
    private Services.TabViewService? _views;

    private void OnUrlChanged(TabItem tab, string url)
    {
        if (tab.PendingHistoryUrl != null) RecordHistory(tab.PendingHistoryUrl, tab.PendingHistoryUrl);
        if (tab.IsActive && !AddressBox.IsKeyboardFocused) AddressBox.Text = url;
        tab.PendingHistoryUrl = url.StartsWith("about:", StringComparison.OrdinalIgnoreCase) ? null : url;
        DetectSocial(tab, url);
    }

    private void OnTitleChanged(TabItem tab, string title)
    {
        tab.Title = string.IsNullOrWhiteSpace(title) ? (tab.Url.StartsWith("http") ? tab.Url : "새 탭") : title;
        if (tab.PendingHistoryUrl != null)
        {
            RecordHistory(string.IsNullOrWhiteSpace(title) ? tab.PendingHistoryUrl : title, tab.PendingHistoryUrl);
            tab.PendingHistoryUrl = null;
        }
        // 소셜 카드 제목을 페이지 타이틀로 갱신(출력 파일명 포함, 시작 전일 때)
        if (tab.PendingSocialUrl != null && !string.IsNullOrWhiteSpace(title))
        {
            _manager.RenameSocial(new Uri(tab.PendingSocialUrl), title);
            tab.PendingSocialUrl = null;
        }
    }

    private void OnDownloadStarting(CoreWebView2 cv, CoreWebView2DownloadStartingEventArgs de)
    {
        try
        {
            var folder = Path.GetFullPath(_config.OutputFolder);
            Directory.CreateDirectory(folder);
            var fn = Path.GetFileName(de.ResultFilePath);
            if (string.IsNullOrWhiteSpace(fn)) fn = $"download_{DateTime.Now:yyyyMMdd_HHmmss}";
            de.ResultFilePath = MakeUniqueDownloadName(folder, fn);
            _manager.LogPanel($"📥 페이지 다운로드 → 저장 폴더: {fn}");

            var item = _pageDownloads.Add(new DownloadOperationAdapter(de.DownloadOperation), fn); // T1-5
            item.UpdateSpeed(0, TimeSpan.FromSeconds(1));
            DownloadsEmptyHint.Visibility = Visibility.Collapsed;
        }
        catch { }
    }

    // ---- T1-5 다운로드 플라이아웃 ----
    private void ToggleDownloads(object sender, RoutedEventArgs e)
    {
        DownloadsPopup.IsOpen = !DownloadsPopup.IsOpen;
    }

    private void DownloadsClear_Click(object sender, RoutedEventArgs e) => _pageDownloads.ClearCompleted();

    private void DlPause_Click(object sender, RoutedEventArgs e)
        => IfDownloadItem(sender, i => _pageDownloads.Pause(i));

    private void DlResume_Click(object sender, RoutedEventArgs e)
        => IfDownloadItem(sender, i => _pageDownloads.Resume(i));

    private void DlCancel_Click(object sender, RoutedEventArgs e)
        => IfDownloadItem(sender, i => _pageDownloads.Cancel(i));

    private static void IfDownloadItem(object sender, Action<PageDownloadItem> act)
    {
        if ((sender as FrameworkElement)?.DataContext is PageDownloadItem item) act(item);
    }

    private void OnActiveTabChanged(TabItem tab)
    {
        if (_splitTab != null && !ReferenceEquals(tab, _splitTab)) ExitSplit(); // v1: 전환 시 분할 해제
        foreach (var t in _tabs.Tabs)
            if (t.View != null) t.View.Visibility = ReferenceEquals(t, tab) ? Visibility.Visible : Visibility.Collapsed;
        if (!AddressBox.IsKeyboardFocused) AddressBox.Text = tab.Url;
        if (tab.IsSuspended) // T2-2: 절전 탭 활성화 시 재개
        {
            try { tab.Core?.Resume(); } catch { }
            tab.IsSuspended = false;
        }
        UpdateNavState();
    }

    private void OnTabRemoved(TabItem tab)
    {
        if (ReferenceEquals(_splitTab, tab)) ExitSplit();
        _views?.RemoveView(tab);
    }

    private void UpdateNavState()
    {
        var cv = Cv;
        Dispatcher.BeginInvoke(new Action(() =>
        {
            NavBack.IsEnabled = cv?.CanGoBack == true;
            NavForward.IsEnabled = cv?.CanGoForward == true;
        }));
    }

    // ---- 탭 스트립 UI 이벤트 ----
    private void NewTab_Click(object sender, RoutedEventArgs e) => NewTabWithDial();

    private void Tab_Click(object sender, MouseButtonEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is TabItem tab)
            _tabs.Activate(tab);
    }

    private void Tab_PreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        // 휠 클릭(미들) → 탭 닫기 (브라우저 관례)
        if (e.ChangedButton == MouseButton.Middle && e.ButtonState == MouseButtonState.Pressed)
        {
            if ((sender as FrameworkElement)?.DataContext is TabItem tab)
            {
                _tabs.CloseTab(tab);
                e.Handled = true;
            }
        }
    }

    private void TabClose_Click(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is TabItem tab)
            _tabs.CloseTab(tab);
    }

    // T1-8 스피커 아이콘 클릭 → 음소거 토글
    private void TabAudio_Click(object sender, MouseButtonEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is TabItem { Core: { } cv } tab)
        {
            try { cv.IsMuted = !cv.IsMuted; tab.IsMuted = cv.IsMuted; } catch { }
        }
        e.Handled = true;
    }

    private void OnResponseReceived(object? sender, CoreWebView2WebResourceResponseReceivedEventArgs e)
    {
        try
        {
            var uri = e.Request.Uri ?? "";
            var method = e.Request.Method ?? "GET";
            string ct = "", cl = "";
            int status = 0;
            try { ct = e.Response.Headers.GetHeader("Content-Type") ?? ""; } catch { }
            try { cl = e.Response.Headers.GetHeader("Content-Length") ?? ""; } catch { }
            try { status = e.Response.StatusCode; } catch { }

            int n = Interlocked.Increment(ref _totalRequests);
            var ctLow = (ct ?? "").ToLowerInvariant();
            // #8 노이즈 content-type(image/font/css/js/beacon)은 requests.log 기록 스킵
            bool loggable = !ctLow.StartsWith("image/") && !ctLow.StartsWith("font/")
                && !ctLow.Contains("/css") && !ctLow.Contains("javascript")
                && !ctLow.Contains("beacon") && !ctLow.Contains("ping");
            if (loggable) _manager.AppendAll($"{n}|{status}|{method}|{ct}|{cl}|{uri}");

            if (status >= 300) return;

            var l = uri.ToLowerInvariant();
            var c = (ct ?? "").ToLowerInvariant();
            long len = long.TryParse(cl, out var lv) ? lv : -1;
            // 206(Partial Content) Range 응답은 Content-Length 가 청크 크기라 작게 잡힘 →
            // Content-Range 의 전체 크기(/total) 로 보정 (Instagram 등 단일 MP4 Range 스트리밍 감지).
            try
            {
                var cr = e.Response.Headers.GetHeader("Content-Range");
                if (!string.IsNullOrEmpty(cr))
                {
                    var slash = cr.LastIndexOf('/');
                    if (slash >= 0 && long.TryParse(cr.AsSpan(slash + 1), out var total) && total > len)
                        len = total;
                }
            }
            catch { }

            string referer = (sender as CoreWebView2)?.Source ?? Cv?.Source ?? "";
            try { var r = e.Request.Headers.GetHeader("Referer"); if (!string.IsNullOrEmpty(r)) referer = r; } catch { }

            var kind = MediaDetector.Classify(uri, ct, len, _config);
            if (kind == MediaKind.Hls)
            {
                _manager.LogPanel($"★ HLS 감지: {uri}");
                _manager.OnDetected(new DetectionContext(uri, referer, MediaKind.Hls, ct));
            }
            else if (kind == MediaKind.Dash)
            {
                _manager.LogPanel($"★ DASH 감지: {uri}");
                _manager.OnDetected(new DetectionContext(uri, referer, MediaKind.Dash, ct));
            }
            else if (kind == MediaKind.Direct)
            {
                // #15(b) chunked video/* (len<0) 는 크기 가드를 건너뛰어 토큰 만료 HTML 오류 페이지가 mp4 로 오탐됨 →
                //        magic-byte probe 로 본문이 실제 미디어인지 재검증(정상 chunked MP4 는 ftyp box 로 통과).
                if (c.StartsWith("video/") && len < 0 && Uri.TryCreate(uri, UriKind.Absolute, out var probeUri))
                    ProbeMediaAsync(probeUri, referer);
                else
                {
                    _manager.LogPanel($"★ 미디어 감지 [{ct}] {FmtLen(len)}: {uri}");
                    _manager.OnDetected(new DetectionContext(uri, referer, MediaKind.Direct, ct));
                }
            }
            else
            {
                // #15 위장 미디어(image/* 또는 octet-stream, 대용량) → magic byte 검증
                long minBytes = _config.MinSizeMB * 1024L * 1024L;
                bool disguised = (c.StartsWith("image/") || c.Contains("octet-stream")) && (len < 0 || len > minBytes);
                if (disguised && Uri.TryCreate(uri, UriKind.Absolute, out var probeUri))
                    ProbeMediaAsync(probeUri, referer);
                else if (MediaDetector.LooksLikeCandidate(l, c))
                    _manager.LogPanel($"[후보 {method}] {uri}");
            }
        }
        catch { }
    }

    private async void ProbeMediaAsync(Uri uri, string referer)
    {
        try
        {
            string key = uri.GetLeftPart(UriPartial.Path);
            lock (_probed)
            {
                if (_probeCount > 40) return;          // 세션당 상한
                if (!_probed.Add(key)) return;          // 중복 URL 스킵
                _probeCount++;
            }
            using var req = new HttpRequestMessage(HttpMethod.Get, uri);
            req.Headers.Range = new RangeHeaderValue(0, 63);
            req.Headers.UserAgent.ParseAdd(_config.UserAgent);
            if (!string.IsNullOrEmpty(referer)) { try { req.Headers.Referrer = new Uri(referer); } catch { } }
            using var resp = await ProbeClient.SendAsync(req, HttpCompletionOption.ResponseHeadersRead);
            if ((int)resp.StatusCode >= 300) return;
            await using var stream = await resp.Content.ReadAsStreamAsync();
            var head = new byte[64];
            int total = 0, m;
            while (total < 64 && (m = await stream.ReadAsync(head, total, 64 - total)) > 0) total += m;
            var fmt = MediaDetector.ProbeFormat(head.AsSpan(0, total));
            if (fmt != null)
            {
                _manager.LogPanel($"★ 위장 미디어 감지 (→{fmt}): {uri}");
                _manager.OnDetected(new DetectionContext(uri.ToString(), referer, MediaKind.Direct, "video/" + fmt));
            }
        }
        catch { }
    }

    private static string FmtLen(long len) => len < 0 ? "?" : $"{len / 1048576.0:F1}MB";

    private async Task<List<CoreWebView2Cookie>> GetCookiesAsync(Uri url)
    {
        var cv = Cv;
        if (cv == null) return new();
        try { return (await cv.CookieManager.GetCookiesAsync(url.ToString())).ToList(); }
        catch { return new(); }
    }

    private void Log(string s)
    {
        var line = $"[{DateTime.Now:HH:mm:ss}] {s}";
        try { File.AppendAllText(_appLogPath, line + Environment.NewLine); } catch { }
        Dispatcher.BeginInvoke(new Action(() => { StatusText.Text = s; }));
    }

    // ---- 네비게이션 ----
    private void Go_Click(object sender, RoutedEventArgs e) => NavigateTo(AddressBox.Text);

    // ---- 주소창 자동완성/제안 ----
    private void AddressBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (_suggesting) return;
        UpdateSuggestions(AddressBox.Text);
        TryInlineSuggest(AddressBox.Text);
    }

    private void UpdateSuggestions(string text)
    {
        text = text?.Trim() ?? "";
        if (text.Length == 0 || !AddressBox.IsKeyboardFocused)
        {
            AddressPopup.IsOpen = false;
            return;
        }
        var low = text.ToLowerInvariant();
        var matches = _history
            .Where(h => h.Url.ToLowerInvariant().Contains(low)
                        || (h.Title ?? "").ToLowerInvariant().Contains(low))
            .Take(8)
            .ToList();
        AddressSuggestions.ItemsSource = matches;
        AddressSuggestions.SelectedIndex = matches.Count > 0 ? 0 : -1;
        AddressPopup.IsOpen = matches.Count > 0;
    }

    // 인라인 자동완성: 방문한 URL 중 입력이 접두사면 나머지를 선택영역으로 채움 (Tab/→ 로 확정)
    private void TryInlineSuggest(string text)
    {
        if (text.Length == 0 || AddressBox.CaretIndex != text.Length) return;
        var low = text.ToLowerInvariant();
        var match = _history.FirstOrDefault(h => h.Url.Length > text.Length
            && h.Url.ToLowerInvariant().StartsWith(low));
        if (match == null) return;
        _suggesting = true;
        AddressBox.Text = match.Url;
        AddressBox.Select(text.Length, match.Url.Length - text.Length);
        _suggesting = false;
    }

    private void AddressBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        var k = e.Key;

        // ↑/↓ 제안 목록 탐색
        if (AddressPopup.IsOpen && AddressSuggestions.HasItems && (k == Key.Down || k == Key.Up))
        {
            int n = AddressSuggestions.Items.Count;
            int delta = k == Key.Down ? 1 : -1;
            int i = Math.Clamp(AddressSuggestions.SelectedIndex + delta, 0, n - 1);
            AddressSuggestions.SelectedIndex = i;
            AddressSuggestions.ScrollIntoView(AddressSuggestions.Items[i]);
            e.Handled = true;
            return;
        }

        // Tab / → 로 인라인 제안 확정 (선택영역을 끝으로 붕괴)
        if ((k == Key.Tab || k == Key.Right) && AddressBox.SelectionLength > 0
            && AddressBox.CaretIndex + AddressBox.SelectionLength == AddressBox.Text.Length)
        {
            AddressBox.CaretIndex = AddressBox.Text.Length;
            AddressBox.Select(AddressBox.Text.Length, 0);
            e.Handled = true;
            return;
        }

        if (k == Key.Escape) { AddressPopup.IsOpen = false; e.Handled = true; return; }

        if (k == Key.Enter)
        {
            AddressPopup.IsOpen = false;
            if (AddressSuggestions.SelectedItem is HistoryEntry sel)
                NavigateTo(sel.Url);
            else
                NavigateTo(AddressBox.Text);
            Keyboard.ClearFocus();
            e.Handled = true;
        }
    }

    // 제안 항목 클릭 → 이동
    private void AddressSuggestion_Click(object sender, MouseButtonEventArgs e)
    {
        if (AddressSuggestions.SelectedItem is HistoryEntry sel)
        {
            AddressPopup.IsOpen = false;
            NavigateTo(sel.Url);
        }
    }

    private void NavBack_Click(object sender, RoutedEventArgs e) => Cv?.GoBack();
    private void NavForward_Click(object sender, RoutedEventArgs e) => Cv?.GoForward();
    private void NavRefresh_Click(object sender, RoutedEventArgs e) => Cv?.Reload();
    private void NavHome_Click(object sender, RoutedEventArgs e) => NavigateTo(_config.HomeUrl);

    internal void NavigateTo(string? url)
    {
        // T1-4: URL/검색어 판별 + 기본 엔진·키워드 전환(g, yt, ...)은 리졸버가 담당
        var intent = _resolver.Resolve(url);
        if (intent == null) return;
        Cv?.Navigate(intent.Target);
    }

    // 소셜 영상 페이지(YouTube/Instagram/X/...) 감지 → yt-dlp 카드 등록. (탭별 상태)
    private void DetectSocial(TabItem tab, string? url)
    {
        if (string.IsNullOrEmpty(url)) { tab.PendingSocialUrl = null; return; }
        if (!Uri.TryCreate(url, UriKind.Absolute, out var uri)) { tab.PendingSocialUrl = null; return; }
        if (SocialSiteDetector.TryMatch(uri, out var normalized, out var label))
        {
            _manager.LogPanel($"★ 소셜 감지 [{label}]: {normalized}");
            _manager.OnDetected(new DetectionContext(normalized, normalized, MediaKind.Social, Tag: label));
            tab.PendingSocialUrl = normalized;
        }
        else tab.PendingSocialUrl = null;
    }

    // ---- 링크로 받기 (URL 붙여넣기) ----
    private void ToggleLink(object sender, RoutedEventArgs e)
    {
        BookmarksPopup.IsOpen = false;
        HistoryPopup.IsOpen = false;
        LinkPopup.IsOpen = !LinkPopup.IsOpen;
        if (LinkPopup.IsOpen) { LinkBox.Clear(); Dispatcher.BeginInvoke(new Action(() => LinkBox.Focus())); }
    }

    private void LinkBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter) { LinkDownload_Click(sender, e); e.Handled = true; }
    }

    private void LinkDownload_Click(object sender, RoutedEventArgs e)
    {
        var raw = (LinkBox.Text ?? "").Trim();
        if (string.IsNullOrEmpty(raw)) return;
        if (!raw.StartsWith("http", StringComparison.OrdinalIgnoreCase)) raw = "https://" + raw;
        if (!Uri.TryCreate(raw, UriKind.Absolute, out var uri)) { Log("올바른 링크가 아닙니다"); return; }
        if (SocialSiteDetector.TryMatch(uri, out var normalized, out var label))
        {
            _manager.LogPanel($"★ 소셜 감지 [{label}]: {normalized}");
            _manager.OnDetected(new DetectionContext(normalized, normalized, MediaKind.Social, Tag: label));
            LinkPopup.IsOpen = false;
            Log("카드에 추가했습니다. 화질을 선택하고 받기를 누르세요");
        }
        else Log("지원하는 소셜 영상 링크가 아닙니다 (YouTube·Instagram·X·TikTok·Facebook)");
    }

    // #7 전역 키보드 단축키 (+Phase A 탭/T1-3/T1-9/T1-11)
    private void OnPreviewKeyDown(object sender, KeyEventArgs e)
    {
        var cv = Cv;
        var mods = Keyboard.Modifiers;

        // Phase A 탭 단축키
        if (mods == ModifierKeys.Control && e.Key == Key.T) { NewTabWithDial(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.J) { DownloadsPopup.IsOpen = !DownloadsPopup.IsOpen; e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.K) { TogglePalette(); e.Handled = true; }
        else if (e.Key == Key.F9) { _ = ToggleReader(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.D) { ToggleBoostDark(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.S) { _ = TakeScreenshot(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.N) { OpenInPrivateTab(); e.Handled = true; }
        else if (mods == (ModifierKeys.Alt | ModifierKeys.Control) && e.Key == Key.V) { ToggleVerticalTabs(); e.Handled = true; }
        else if (mods == (ModifierKeys.Alt | ModifierKeys.Control) && e.Key == Key.H) { ToggleSplit(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.U) { ViewSource(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.P) { try { Cv?.ShowPrintUI(); } catch { } e.Handled = true; }
        else if (e.Key == Key.OemQuestion && Keyboard.FocusedElement is not TextBox) { OpenFind(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.A) { ToggleTabSearch(this, e); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.B) { ToggleBookmarkBar(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.T) { _tabs.ReopenClosedTab(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.W) { _tabs.CloseTab(_tabs.ActiveTab!); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.W) { if (_tabs.ActiveTab != null) _tabs.CloseTab(_tabs.ActiveTab); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.Tab) { _tabs.ActivateNext(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.Tab) { _tabs.ActivatePrevious(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key >= Key.D1 && e.Key <= Key.D9)
        {
            var idx = e.Key - Key.D1;
            if (idx == 8) _tabs.ActivateLast(); else _tabs.ActivateAt(idx); // Ctrl+9 = 마지막 탭
            e.Handled = true;
        }
        // T1-3 검색 바가 열려 있으면 Esc 는 닫기가 우선
        else if (e.Key == Key.Escape && FindBar.Visibility == Visibility.Visible) { CloseFind(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.F) { OpenFind(); e.Handled = true; }
        else if (e.Key == Key.F3)
        {
            if (FindBar.Visibility == Visibility.Visible)
            {
                if (mods == ModifierKeys.Shift) _tabs.ActiveTab?.FindSession?.Previous();
                else _tabs.ActiveTab?.FindSession?.Next();
            }
            else OpenFind();
            e.Handled = true;
        }
        else if (e.Key == Key.F11) { ToggleFullscreen(); e.Handled = true; }
        else if (mods == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.R) { ForceReload(); e.Handled = true; }
        else if (mods == ModifierKeys.Control && e.Key == Key.L) { AddressBox.Focus(); AddressBox.SelectAll(); e.Handled = true; }
        else if (e.Key == Key.F5 || (mods == ModifierKeys.Control && e.Key == Key.R)) { cv?.Reload(); e.Handled = true; }
        else if (e.Key == Key.Escape) { try { cv?.Stop(); } catch { } e.Handled = true; }
        else if (mods == ModifierKeys.Alt && e.Key == Key.Left) { try { if (cv?.CanGoBack == true) cv.GoBack(); } catch { } e.Handled = true; }
        else if (mods == ModifierKeys.Alt && e.Key == Key.Right) { try { if (cv?.CanGoForward == true) cv.GoForward(); } catch { } e.Handled = true; }
        else if (mods == ModifierKeys.Control)
        {
            if (e.Key == Key.OemPlus || e.Key == Key.Add) { try { ZoomBy(+0.1); } catch { } e.Handled = true; }
            else if (e.Key == Key.OemMinus || e.Key == Key.Subtract) { try { ZoomBy(-0.1); } catch { } e.Handled = true; }
            else if (e.Key == Key.D0) { try { ZoomSet(1.0); } catch { } e.Handled = true; }
        }
    }

    private void ZoomBy(double delta) => ZoomSet(Math.Clamp((ActiveView?.ZoomFactor ?? 1.0) + delta, 0.1, 5.0));

    private void ZoomSet(double zoom)
    {
        if (ActiveView == null) return;
        ActiveView.ZoomFactor = zoom;
        PersistZoom();
    }

    // ---- T1-3 페이지 내 검색 바 (활성 탭 세션) ----
    internal void OpenFind()
    {
        FindBar.Visibility = Visibility.Visible;
        FindStatus.Text = "";
        FindBox.Focus();
        FindBox.SelectAll();
        if (FindBox.Text.Length > 0) _ = _tabs.ActiveTab?.FindSession?.StartAsync(FindBox.Text);
    }

    internal void CloseFind()
    {
        FindBar.Visibility = Visibility.Collapsed;
        _tabs.ActiveTab?.FindSession?.Close();
        FindStatus.Text = "";
    }

    private void FindBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (FindBar.Visibility == Visibility.Visible)
            _ = _tabs.ActiveTab?.FindSession?.StartAsync(FindBox.Text);
    }

    private void FindBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter)
        {
            if (Keyboard.Modifiers == ModifierKeys.Shift) _tabs.ActiveTab?.FindSession?.Previous();
            else _tabs.ActiveTab?.FindSession?.Next();
            e.Handled = true;
        }
        else if (e.Key == Key.Escape) { CloseFind(); e.Handled = true; }
    }

    private void FindNext_Click(object sender, RoutedEventArgs e) => _tabs.ActiveTab?.FindSession?.Next();
    private void FindPrev_Click(object sender, RoutedEventArgs e) => _tabs.ActiveTab?.FindSession?.Previous();
    private void FindClose_Click(object sender, RoutedEventArgs e) => CloseFind();

    private void FindOption_Changed(object sender, RoutedEventArgs e)
        => _tabs.ActiveTab?.FindSession?.SetOptions(FindCaseBox.IsChecked == true, FindWordBox.IsChecked == true);

    // T1-7 줌 변경을 사이트별 저장소에 영속
    private void PersistZoom()
    {
        var cv = Cv;
        if (cv != null && ActiveView != null) _zoomStore.Set(cv.Source, ActiveView.ZoomFactor);
    }

    // T1-9 강제 새로고침: 디스크 캐시 비우고 다시 로드
    private async void ForceReload()
    {
        var cv = Cv;
        if (cv == null) return;
        try { await cv.Profile.ClearBrowsingDataAsync(CoreWebView2BrowsingDataKinds.DiskCache); }
        catch { }
        try { cv.Reload(); } catch { }
    }

    // T1-11 전체화면(F11): 툴바/탭/상태바 숨기고 최대화. 재누르면 복원.
    internal void ToggleFullscreen()
    {
        _fullscreen = !_fullscreen;
        if (_fullscreen)
        {
            _stateBeforeFullscreen = WindowState;
            WindowState = WindowState.Maximized;
        }
        else
        {
            WindowState = _stateBeforeFullscreen;
        }
        ToolbarRow.Visibility = _fullscreen ? Visibility.Collapsed : Visibility.Visible;
        TabStripRow.Visibility = _fullscreen ? Visibility.Collapsed : Visibility.Visible;
        StatusBar.Visibility = _fullscreen ? Visibility.Collapsed : Visibility.Visible;
    }

    private static string MakeUniqueDownloadName(string folder, string file)
    {
        var p = Path.Combine(folder, file);
        if (!File.Exists(p)) return p;
        var name = Path.GetFileNameWithoutExtension(file);
        var ext = Path.GetExtension(file);
        int i = 1;
        while (File.Exists(Path.Combine(folder, $"{name} ({i}){ext}"))) i++;
        return Path.Combine(folder, $"{name} ({i}){ext}");
    }

    // ---- 범용 우측 패널: 접기/펼치기 + 리사이즈 + 상태 저장 ----
    private static double ClampPanelWidth(double w) => Math.Clamp(w, MinExpandedWidth, MaxExpandedWidth);

    private void ApplyPanelState(bool collapsed)
    {
        _panelCollapsed = collapsed;
        RightCol.Width = new GridLength(collapsed ? CollapsedPanelWidth : _panelExpandedWidth);
        PanelBody.Visibility = collapsed ? Visibility.Collapsed : Visibility.Visible;
        PanelTitle.Visibility = collapsed ? Visibility.Collapsed : Visibility.Visible;
        PanelCountBadge.Visibility = collapsed ? Visibility.Collapsed : Visibility.Visible;
        RightSplitter.Visibility = collapsed ? Visibility.Collapsed : Visibility.Visible;
        // ←(펼치기) / →(접기) chevron. 접힘 시에도 토글 버튼은 헤더에 남아 클릭 가능.
        PanelToggle.Content = collapsed ? "" : "";
        PanelToggle.ToolTip = collapsed ? "패널 펼치기" : "패널 접기";
    }

    private void PanelToggle_Click(object sender, RoutedEventArgs e)
    {
        // 접기 직전 폭을 기억(다시 펼칠 때 복원)
        if (!_panelCollapsed) _panelExpandedWidth = ClampPanelWidth(RightCol.Width.Value);
        ApplyPanelState(!_panelCollapsed);
        PersistPanel();
    }

    private void RightSplitter_DragCompleted(object sender, DragCompletedEventArgs e)
    {
        if (_panelCollapsed) return;
        double w = RightCol.Width.Value;
        if (w <= 120) ApplyPanelState(true);   // 너무 좁히면 접기 처리
        else _panelExpandedWidth = ClampPanelWidth(w);
        PersistPanel();
    }

    private void PersistPanel()
    {
        _config.RightPanelCollapsed = _panelCollapsed;
        _config.RightPanelWidth = _panelCollapsed ? _panelExpandedWidth : ClampPanelWidth(RightCol.Width.Value);
        ConfigStore.Save(_config);
    }

    private void OnWindowClosing(object? sender, System.ComponentModel.CancelEventArgs e)
    {
        _config.RightPanelCollapsed = _panelCollapsed;
        if (!_panelCollapsed) _config.RightPanelWidth = ClampPanelWidth(RightCol.Width.Value);
        ConfigStore.Save(_config);
        // T1-10 세션 저장: 탭 URL/활성/핀 보존
        try { if (_tabs != null) TabSessionStore.Save(SessionPath, _tabs.CaptureSession()); } catch { }
    }

    // ---- 개인정보 보호 모드 + 브라우저 데이터 관리 ----
    private void UpdatePrivateButton()
    {
        if (PrivateBtn == null) return;
        try
        {
            PrivateBtn.Foreground = _config.PrivateMode
                ? (Brush)FindResource("AccentBrush")
                : (Brush)FindResource("TextSecondary");
            PrivateBtn.ToolTip = _config.PrivateMode
                ? "개인정보 보호 모드 켜짐 — 클릭 시 일반 모드로 전환(재시작)"
                : "개인정보 보호 모드(InPrivate)";
        }
        catch { }
    }

    // 토글 → 확인 → 플래그 저장 → 재시작(테마 전환과 동일 패턴)
    private void TogglePrivate_Click(object sender, RoutedEventArgs e)
    {
        bool next = !_config.PrivateMode;
        var msg = next
            ? "개인정보 보호 모드(InPrivate)로 전환합니다.\n이 모드에서는 쿠키·세션·localStorage가 저장되지 않습니다.\n앱이 재시작되며 현재 페이지는 닫힙니다."
            : "일반 모드로 전환합니다.\n앱이 재시작되며 현재 페이지는 닫힙니다.";
        if (MessageBox.Show(msg + "\n\n계속할까요?", "브라우저 모드", MessageBoxButton.OKCancel, MessageBoxImage.Question) != MessageBoxResult.OK)
            return;
        _config.PrivateMode = next;
        ConfigStore.Save(_config);
        RestartApp();
    }

    /// <summary>현재 프로필의 브라우저 데이터(쿠키·DOM 저장소·캐시) 삭제. 일반 모드: 영속 프로필 정리.</summary>
    public async Task ClearBrowsingDataAsync()
    {
        var cv = Cv;
        if (cv == null) { Log("브라우저가 아직 준비되지 않았습니다"); return; }
        try
        {
            await cv.Profile.ClearBrowsingDataAsync();
            Log("브라우저 데이터(쿠키·localStorage·캐시)를 삭제했습니다. 페이지를 새로고침하세요.");
        }
        catch (Exception ex) { Log($"데이터 삭제 실패: {ex.Message}"); }
    }

    // ---- 즐겨찾기 ----
    private void ToggleBookmarks(object sender, RoutedEventArgs e)
    {
        HistoryPopup.IsOpen = false;
        LinkPopup.IsOpen = false;
        BookmarksPopup.IsOpen = !BookmarksPopup.IsOpen;
    }

    private void AddBookmark_Click(object sender, RoutedEventArgs e)
    {
        var cv = Cv;
        var url = cv?.Source ?? "";
        if (string.IsNullOrEmpty(url) || url.StartsWith("about:", StringComparison.OrdinalIgnoreCase)) return;
        if (_bookmarks.Any(b => b.Url == url)) { Log("이미 즐겨찾기에 있습니다"); return; }
        var title = Trunc(string.IsNullOrWhiteSpace(cv!.DocumentTitle) ? url : cv.DocumentTitle, 80);
        _bookmarks.Insert(0, new Bookmark(title, url));
        BrowserStore.SaveBookmarks(_bookmarks.ToList());
        if (BookmarkBar.Visibility == Visibility.Visible) RefreshBookmarkBar();
        Log($"즐겨찾기 추가: {title}");
    }

    private void RemoveBookmark_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is Bookmark b)
        {
            _bookmarks.Remove(b);
            BrowserStore.SaveBookmarks(_bookmarks.ToList());
        }
    }

    private void OpenBookmark_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is Bookmark b)
        {
            BookmarksPopup.IsOpen = false;
            NavigateTo(b.Url);
        }
    }

    // ---- 히스토리 ----
    private void ToggleHistory(object sender, RoutedEventArgs e)
    {
        BookmarksPopup.IsOpen = false;
        LinkPopup.IsOpen = false;
        HistoryPopup.IsOpen = !HistoryPopup.IsOpen;
    }

    private void OpenHistory_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is HistoryEntry h)
        {
            HistoryPopup.IsOpen = false;
            NavigateTo(h.Url);
        }
    }

    private void ClearHistory_Click(object sender, RoutedEventArgs e)
    {
        _history.Clear();
        BrowserStore.SaveHistory(new List<HistoryEntry>());
        Log("방문 기록을 삭제했습니다");
    }

    private void RecordHistory(string title, string url)
    {
        if (string.IsNullOrEmpty(url)) return;
        if (_history.Count > 0 && _history[0].Url == url) return;
        _history.Insert(0, new HistoryEntry(Trunc(title, 80), url, DateTime.Now));
        while (_history.Count > 500) _history.RemoveAt(_history.Count - 1);
        BrowserStore.SaveHistory(_history.ToList());
    }

    // ---- T2-8 탭 검색 (Ctrl+Shift+A) ----
    private void ToggleTabSearch(object sender, RoutedEventArgs e)
    {
        var open = !TabSearchPopup.IsOpen;
        TabSearchPopup.IsOpen = open;
        if (open)
        {
            TabSearchBox.Clear();
            TabSearchBox.Focus();
        }
    }

    private void TabSearchBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        var results = TabSearchFilter.Search(_tabs.Tabs, _tabs.ClosedStack, TabSearchBox.Text);
        TabSearchResults.ItemsSource = results;
        TabSearchResults.SelectedIndex = results.Count > 0 ? 0 : -1;
    }

    private void TabSearchBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Escape) { TabSearchPopup.IsOpen = false; e.Handled = true; }
        else if (e.Key == Key.Down && TabSearchResults.HasItems) { TabSearchResults.SelectedIndex = Math.Min(TabSearchResults.SelectedIndex + 1, TabSearchResults.Items.Count - 1); e.Handled = true; }
        else if (e.Key == Key.Up && TabSearchResults.HasItems) { TabSearchResults.SelectedIndex = Math.Max(TabSearchResults.SelectedIndex - 1, 0); e.Handled = true; }
        else if (e.Key == Key.Enter)
        {
            if (TabSearchResults.SelectedItem is TabSearchResult sel) ActivateSearchResult(sel);
            e.Handled = true;
        }
    }

    private void TabSearchResult_Click(object sender, MouseButtonEventArgs e)
    {
        if (TabSearchResults.SelectedItem is TabSearchResult sel) ActivateSearchResult(sel);
    }

    private void ActivateSearchResult(TabSearchResult sel)
    {
        TabSearchPopup.IsOpen = false;
        if (sel.IsClosed)
        {
            var reopened = _tabs.ReopenClosedTab();
            if (reopened == null) _tabs.NewTab(sel.Url);
        }
        else _tabs.Activate(sel.Tab);
    }

    // ---- T1-6 북마크바 (Ctrl+Shift+B) ----
    private void ToggleBookmarkBar()
    {
        BookmarkBar.Visibility = BookmarkBar.Visibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;
        if (BookmarkBar.Visibility == Visibility.Visible) RefreshBookmarkBar();
    }

    private void RefreshBookmarkBar() => BookmarkBarList.ItemsSource = _bookmarks.Take(30).ToList();

    private void BookmarkBar_Click(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is Bookmark b) NavigateTo(b.Url);
    }

    // ---- T2-12 컨텍스트 메뉴 ----
    private void OnContextMenuBuild(CoreWebView2 cv, CoreWebView2ContextMenuRequestedEventArgs ce)
    {
        try
        {
            var menu = new ContextMenu();
            var target = ce.ContextMenuTarget;

            var link = target?.LinkUri;
            if (!string.IsNullOrEmpty(link))
            {
                var download = new MenuItem { Header = "이 링크의 영상 받기", FontWeight = FontWeights.Medium };
                download.Click += (_, _) => QueueLinkForDownload(link);
                menu.Items.Add(download);

                var copy = new MenuItem { Header = "링크 주소 복사" };
                copy.Click += (_, _) => { try { Clipboard.SetText(link); } catch { } };
                menu.Items.Add(copy);
                menu.Items.Add(new Separator());
            }

            foreach (var builtin in ce.MenuItems)
            {
                if (builtin.Kind == CoreWebView2ContextMenuItemKind.Separator)
                {
                    if (menu.Items.Count > 0 && menu.Items[^1] is not Separator) menu.Items.Add(new Separator());
                    continue;
                }
                if (builtin.Kind != CoreWebView2ContextMenuItemKind.Command) continue;
                var mi = new MenuItem { Header = builtin.Label, IsEnabled = builtin.IsEnabled };
                var commandId = builtin.CommandId;
                mi.Click += (_, _) =>
                {
                    try { ce.SelectedCommandId = commandId; ce.Handled = true; } catch { }
                };
                menu.Items.Add(mi);
            }
            while (menu.Items.Count > 0 && menu.Items[^1] is Separator) menu.Items.RemoveAt(menu.Items.Count - 1);

            var view = ActiveView;
            if (view != null)
            {
                var pt = view.PointToScreen(new Point(ce.Location.X, ce.Location.Y));
                menu.PlacementTarget = view;
                menu.Placement = System.Windows.Controls.Primitives.PlacementMode.AbsolutePoint;
                menu.HorizontalOffset = pt.X;
                menu.VerticalOffset = pt.Y;
            }
            menu.IsOpen = true;
        }
        catch { }
    }

    private void QueueLinkForDownload(string? link)
    {
        if (string.IsNullOrEmpty(link)) return;
        if (!Uri.TryCreate(link, UriKind.Absolute, out var uri)) return;
        var referer = Cv?.Source ?? link;

        if (SocialSiteDetector.TryMatch(uri, out var normalized, out var label))
        {
            _manager.LogPanel($"컨텍스트 메뉴 소셜 감지 [{label}]: {normalized}");
            _manager.OnDetected(new DetectionContext(normalized, normalized, MediaKind.Social, Tag: label));
            return;
        }
        var kind = MediaDetector.Classify(link, "", -1, _config) ?? MediaKind.Direct;
        _manager.LogPanel($"컨텍스트 메뉴 감지 [{kind}]: {link}");
        _manager.OnDetected(new DetectionContext(link, referer, kind, ""));
    }

    // ==================== Phase C 기능 ====================

    // ---- T2-1 명령 팔레트 ----
    private void BuildPalette()
    {
        _palette.Register("새 탭", "tab new", () => NewTabWithDial());
        _palette.Register("새 InPrivate 탭", "private incognito 사생활", OpenInPrivateTab);
        _palette.Register("탭 닫기", "close", () => { if (_tabs.ActiveTab != null) _tabs.CloseTab(_tabs.ActiveTab); });
        _palette.Register("닫은 탭 복원", "reopen restore", () => _tabs.ReopenClosedTab());
        _palette.Register("탭 검색", "tab search find", () => ToggleTabSearch(this, new RoutedEventArgs()));
        _palette.Register("다운로드", "downloads page", () => DownloadsPopup.IsOpen = true);
        _palette.Register("북마크바 토글", "bookmark bar", ToggleBookmarkBar);
        _palette.Register("전체화면", "fullscreen f11", ToggleFullscreen);
        _palette.Register("리더 모드", "reader reading 읽기", async () => await ToggleReader());
        _palette.Register("강제 다크 모드 토글", "dark boost theme", ToggleBoostDark);
        _palette.Register("세로 탭 토글", "vertical layout", ToggleVerticalTabs);
        _palette.Register("분할 화면 토글", "split zen tile", ToggleSplit);
        _palette.Register("그림 속 그림 (PiP)", "pip picture video", TogglePip);
        _palette.Register("스크린샷", "screenshot capture", async () => await TakeScreenshot());
        _palette.Register("소스 보기", "source html", ViewSource);
        _palette.Register("인쇄", "print pdf", () => { try { Cv?.ShowPrintUI(); } catch { } });
        _palette.Register("저장 폴더 열기", "folder open output", () => OpenInExplorer(null));
        _palette.Register("이 페이지 즐겨찾기", "bookmark add star", () => AddBookmark_Click(this, new RoutedEventArgs()));
        _palette.RegisterSeparator();
        _palette.RegisterDynamic(() => _tabs.Tabs
            .Select(t => new PaletteCommand($"탭 전환: {Trunc(t.Title, 40)}", "tab go switch", () => _tabs.Activate(t)))
            .ToList());
        _palette.RegisterDynamic(() => _workspaces
            .Select(w => new PaletteCommand($"워크스페이스 전환: {w.Name}", "workspace switch", () => SwitchWorkspace(w)))
            .ToList());
    }

    private void TogglePalette()
    {
        var open = !PalettePopup.IsOpen;
        PalettePopup.IsOpen = open;
        if (open) { PaletteBox.Clear(); PaletteBox.Focus(); }
    }

    private void PaletteBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        var results = _palette.Search(PaletteBox.Text);
        PaletteResults.ItemsSource = results;
        PaletteResults.SelectedIndex = results.Count > 0 ? 0 : -1;
    }

    private void PaletteBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Escape) { PalettePopup.IsOpen = false; e.Handled = true; }
        else if (e.Key == Key.Down && PaletteResults.HasItems) { PaletteResults.SelectedIndex = Math.Min(PaletteResults.SelectedIndex + 1, PaletteResults.Items.Count - 1); e.Handled = true; }
        else if (e.Key == Key.Up && PaletteResults.HasItems) { PaletteResults.SelectedIndex = Math.Max(PaletteResults.SelectedIndex - 1, 0); e.Handled = true; }
        else if (e.Key == Key.Enter)
        {
            if (PaletteResults.SelectedItem is PaletteCommand cmd) { PalettePopup.IsOpen = false; cmd.Execute(); }
            e.Handled = true;
        }
    }

    private void PaletteResult_Click(object sender, MouseButtonEventArgs e)
    {
        if (PaletteResults.SelectedItem is PaletteCommand cmd) { PalettePopup.IsOpen = false; cmd.Execute(); }
    }

    // ---- T2-4 리더 모드 ----
    private async Task ToggleReader()
    {
        var tab = _tabs.ActiveTab;
        if (tab == null) return;
        var result = await ReaderMode.ToggleAsync(tab, App.IsLightTheme);
        if (result == null) Log("이 페이지에서는 리더 모드를 사용할 수 없습니다");
    }

    // ---- T2-7 부스트(강제 다크) ----
    private void ToggleBoostDark()
    {
        var url = Cv?.Source;
        if (string.IsNullOrEmpty(url)) { Log("페이지가 없습니다"); return; }
        var cur = _boostStore.Get(url);
        _boostStore.Set(url, !cur.ForceDark, cur.CustomCss);
        _views?.ApplyBoostNow(_tabs.ActiveTab!);
        Log(!cur.ForceDark ? "이 사이트 강제 다크 켜짐" : "이 사이트 강제 다크 꺼짐");
    }

    // ---- T2-9 스크린샷 ----
    private async Task TakeScreenshot()
    {
        var cv = Cv;
        if (cv == null) return;
        try
        {
            using var ms = new MemoryStream();
            await cv.CapturePreviewAsync(CoreWebView2CapturePreviewImageFormat.Png, ms);
            var path = MakeUniqueDownloadName(Path.GetFullPath(_config.OutputFolder),
                $"screenshot_{DateTime.Now:yyyyMMdd_HHmmss}.png");
            await File.WriteAllBytesAsync(path, ms.ToArray());
            Log($"스크린샷 저장: {Path.GetFileName(path)}");
        }
        catch (Exception ex) { Log($"스크린샷 실패: {ex.Message}"); }
    }

    // ---- T2-5 세로 탭 ----
    private void ToggleVerticalTabs()
    {
        _verticalTabs = !_verticalTabs;
        if (_verticalTabs)
        {
            TabStripRow.Visibility = Visibility.Collapsed;
            SideStripCol.Width = new GridLength(210);
            var sv = new ScrollViewer
            {
                VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
                HorizontalScrollBarVisibility = ScrollBarVisibility.Disabled,
                Padding = new Thickness(4, 8, 4, 8)
            };
            sv.Content = TabList;
            TabSideHost.Child = sv;
            SetTabListOrientation(Orientation.Vertical);
        }
        else
        {
            SetTabListOrientation(Orientation.Horizontal);
            TabSideHost.Child = null;
            // 원래 스트립의 DockPanel 로 복귀 (NewTabBtn 옆 ScrollViewer)
            var sv = new ScrollViewer
            {
                HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden,
                VerticalScrollBarVisibility = ScrollBarVisibility.Disabled,
                VerticalAlignment = VerticalAlignment.Bottom
            };
            sv.Content = TabList;
            // 기존 DockPanel: 스트립의 유일한 DockPanel
            var dock = TabStripRow.Child as DockPanel;
            dock?.Children.Add(sv);
            SideStripCol.Width = new GridLength(0);
            TabStripRow.Visibility = Visibility.Visible;
        }
        if (_fullscreen) TabStripRow.Visibility = Visibility.Collapsed; // 전체화면 유지
    }

    private void SetTabListOrientation(Orientation o)
    {
        var factory = new FrameworkElementFactory(typeof(StackPanel));
        factory.SetValue(StackPanel.OrientationProperty, o);
        TabList.ItemsPanel = new ItemsPanelTemplate(factory);
    }

    // ---- T2-3 분할 화면 (활성 + 다음 탭 나란히) ----
    private void ToggleSplit()
    {
        if (_splitTab != null) { ExitSplit(); return; }
        var active = _tabs.ActiveTab;
        if (active == null) return;
        var next = _tabs.Tabs.FirstOrDefault(t => !ReferenceEquals(t, active)) ?? _tabs.NewTab(activate: false);
        if (next.View?.Parent is Grid host) host.Children.Remove(next.View);
        _splitTab = next;
        SplitRightHost.Child = next.View;
        next.View!.Visibility = Visibility.Visible;
        SplitCol.Width = new GridLength(Math.Max(280, (TabHost.ActualWidth == 0 ? 600 : TabHost.ActualWidth) / 2));
        SplitRightHost.Visibility = Visibility.Visible;
        SplitSplitter.Visibility = Visibility.Visible;
        Log($"분할 화면: {Trunc(next.Title, 30)}");
    }

    private void ExitSplit()
    {
        if (_splitTab?.View != null)
        {
            SplitRightHost.Child = null;
            TabHost.Children.Add(_splitTab.View);
            _splitTab.View.Visibility = ReferenceEquals(_splitTab, _tabs.ActiveTab) ? Visibility.Visible : Visibility.Collapsed;
        }
        _splitTab = null;
        SplitCol.Width = new GridLength(0);
        SplitRightHost.Visibility = Visibility.Collapsed;
        SplitSplitter.Visibility = Visibility.Collapsed;
    }

    // ---- T2-6 Glance (Alt+클릭 링크 미리보기) ----
    private void OpenGlance(string url)
    {
        try
        {
            var glance = new GlanceWindow(_env!, _config, url)
            {
                Owner = this,
                ShowInTaskbar = false,
                WindowStyle = WindowStyle.None,
                AllowsTransparency = false,
                Background = System.Windows.Media.Brushes.Black
            };
            glance.ExpandRequested += g =>
            {
                g.Close();
                _tabs.NewTab(g.Url); // 탭으로 승격
            };
            glance.Show();
        }
        catch (Exception ex) { Log($"미리보기 실패: {ex.Message}"); }
    }

    // ---- T3-9 낭독(TTS) ----
    private void SpeakText(string text)
    {
        try
        {
            _speech?.Dispose();
            _speech = new System.Speech.Synthesis.SpeechSynthesizer();
            if (text.Length > 4000) text = text[..4000];
            _speech.SpeakAsync(text);
        }
        catch { }
    }

    // ---- T3-3 InPrivate 탭 ----
    private void OpenInPrivateTab()
    {
        _views!.NextTabIsPrivate = true;
        var t = _tabs.NewTab();
        t.Title = "InPrivate 탭";
        Log("InPrivate 탭 열림 — 이 탭은 디스크에 저장되지 않습니다");
    }

    // ---- T3-10 소스 보기 ----
    private async void ViewSource()
    {
        var cv = Cv;
        if (cv == null) return;
        try
        {
            var html = await cv.ExecuteScriptAsync("document.documentElement.outerHTML");
            var decoded = System.Text.Json.JsonSerializer.Deserialize<string>(html) ?? "";
            var wrapped = "<!DOCTYPE html><html><head><meta charset='utf-8'><style>body{background:#1b1c24;color:#d4d4dc;font-family:Consolas,monospace;font-size:12.5px;white-space:pre-wrap;padding:20px}</style></head><body>"
                + System.Net.WebUtility.HtmlEncode(decoded) + "</body></html>";
            cv.NavigateToString(wrapped);
        }
        catch { }
    }

    // ---- T3-7 PiP ----
    private void TogglePip()
    {
        var cv = Cv;
        if (cv == null) return;
        _ = cv.ExecuteScriptAsync("""
(function(){ try {
  var v = Array.from(document.querySelectorAll('video')).find(x => !x.paused && !x.disabled) || document.querySelector('video');
  if (!v) { return 'NO_VIDEO'; }
  if (document.pictureInPictureElement) { document.exitPictureInPicture(); return 'EXITED'; }
  v.disablePictureInPicture = false;
  v.requestPictureInPicture(); return 'PIP';
} catch(e){ return 'ERR:'+e.message; } })();
""");
        Log("그림 속 그림 전환 (재생 중인 영상이 없으면 첫 번째 영상)");
    }

    // ---- T3-6 새 탭 스피드 다이얼 ----
    private void NewTabWithDial()
    {
        var tab = _tabs.NewTab();
        _ = ShowDialAsync(tab);
    }

    private async Task ShowDialAsync(TabItem tab)
    {
        await WaitTabReadyLocal(tab);
        var cv = tab.Core;
        if (cv == null) return;
        var tiles = _bookmarks.Take(18).Select(b =>
            $"<a href='{System.Net.WebUtility.HtmlEncode(b.Url)}' style='display:block;text-decoration:none;background:#262736;color:#e6e6ec;border-radius:12px;padding:18px 12px;text-align:center;font-size:12.5px;min-width:110px' onmouseover='this.style.background=#2f3042' onmouseout='this.style.background=#262736'><div style='font-size:26px;margin-bottom:8px'>&#127760;</div><div style='overflow:hidden;text-overflow:ellipsis;white-space:nowrap'>{System.Net.WebUtility.HtmlEncode(b.Title)}</div></a>").ToList();
        var dial = "<!DOCTYPE html><html><head><meta charset='utf-8'><style>body{background:#14151d;color:#e6e6ec;font-family:'Segoe UI',sans-serif;margin:0;padding:48px 24px}h1{font-size:20px;text-align:center;margin-bottom:28px;font-weight:600}.grid{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;max-width:760px;margin:0 auto}.hint{text-align:center;color:#8a8aa0;font-size:12px;margin-top:36px}a{color:inherit}</style></head><body><h1>새 탭</h1><div class='grid'>" + string.Join("", tiles) + $"</div><div class='hint'>주소창에 검색어나 URL 을 입력하세요 · 즐겨찾기 {_bookmarks.Count}개 중 {tiles.Count}개 표시</div></body></html>";
        cv.NavigateToString(dial);
    }

    private async Task WaitTabReadyLocal(TabItem tab)
    {
        var sw = System.Diagnostics.Stopwatch.StartNew();
        while (tab.Core == null && sw.ElapsedMilliseconds < 15000)
            await Task.Delay(50);
    }

    // ---- T2-11/T3-1 탭 컨텍스트 메뉴 + 워크스페이스 ----
    private static readonly string[] GroupColors = { "#e74c3c", "#3498db", "#2ecc71", "#f39c12", "#9b59b6", "#e91e8c" };

    private void Tab_ContextMenu(object sender, MouseButtonEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is not TabItem tab) return;
        e.Handled = true;
        var menu = new ContextMenu();

        var pin = new MenuItem { Header = tab.IsPinned ? "고정 해제" : "탭 고정" };
        pin.Click += (_, _) => _tabs.SetPinned(tab, !tab.IsPinned);
        menu.Items.Add(pin);

        var dup = new MenuItem { Header = "탭 복제" };
        dup.Click += (_, _) => _tabs.NewTab(tab.Url);
        menu.Items.Add(dup);

        var mute = new MenuItem { Header = tab.Core is { IsMuted: true } ? "음소거 해제" : "사이트 음소거" };
        mute.Click += (_, _) => { try { if (tab.Core != null) { tab.Core.IsMuted = !(tab.Core?.IsMuted == true); tab.IsMuted = tab.Core.IsMuted; } } catch { } };
        menu.Items.Add(mute);

        menu.Items.Add(new Separator());

        var group = new MenuItem { Header = "그룹" };
        var noGroup = new MenuItem { Header = "그룹 없음" };
        noGroup.Click += (_, _) => _tabs.SetGroup(tab, null, null);
        group.Items.Add(noGroup);
        for (var i = 0; i < GroupColors.Length; i++)
        {
            var color = GroupColors[i];
            var mi = new MenuItem { Header = $"그룹 {i + 1}" };
            var sw = new System.Windows.Shapes.Ellipse { Width = 10, Height = 10 };
            sw.Fill = new System.Windows.Media.SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString(color));
            mi.Icon = sw;
            mi.Click += (_, _) => _tabs.SetGroup(tab, $"G{i + 1}", color);
            group.Items.Add(mi);
        }
        menu.Items.Add(group);

        if (tab.GroupName != null)
        {
            var closeG = new MenuItem { Header = $"그룹 전체 닫기 ({tab.GroupName})" };
            closeG.Click += (_, _) => _tabs.CloseGroup(tab.GroupName!);
            menu.Items.Add(closeG);
        }

        menu.Items.Add(new Separator());
        var close = new MenuItem { Header = "탭 닫기" };
        close.Click += (_, _) => _tabs.CloseTab(tab);
        menu.Items.Add(close);

        menu.PlacementTarget = sender as UIElement;
        menu.IsOpen = true;
    }

    private void SaveWorkspace(string name)
    {
        _workspaces.RemoveAll(w => w.Name == name);
        _workspaces.Insert(0, _tabs.CaptureWorkspace(name));
        if (_workspaces.Count > 6) _workspaces.RemoveAt(_workspaces.Count - 1);
        try
        {
            Directory.CreateDirectory(AppDataDir);
            File.WriteAllText(Path.Combine(AppDataDir, "workspaces.json"),
                System.Text.Json.JsonSerializer.Serialize(_workspaces));
        }
        catch { }
        Log($"워크스페이스 '{name}' 저장 ({_tabs.Tabs.Count} 탭)");
    }

    private void SwitchWorkspace(WorkspaceSnapshot ws)
    {
        ExitSplit();
        _tabs.SwitchWorkspace(ws);
        Log($"워크스페이스 '{ws.Name}' 전환 ({ws.Urls.Count} 탭)");
    }

    // ---- 카드 액션 ----
    private void CardDownload_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is DownloadItemViewModel it)
            _ = _manager.StartDownload(it);
    }

    // 소셜 카드: yt-dlp -J 로 사용 가능한 화질 조회 → 드롭다운 교체
    private void CardFetchFormats_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is DownloadItemViewModel it)
            _ = _manager.FetchFormatsAsync(it);
    }

    private void CardRetry_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is DownloadItemViewModel it)
            _ = _manager.RetryDownload(it);
    }

    // #1 다운로드 취소
    private void CardCancel_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is DownloadItemViewModel it)
        {
            _manager.Cancel(it);
            Log($"취소 요청: {it.Title}");
        }
    }

    private void CardFolder_Click(object sender, RoutedEventArgs e)
    {
        if (sender is FrameworkElement fe && fe.DataContext is DownloadItemViewModel it)
            OpenInExplorer(it.OutputPath);
    }

    private void OpenFolder_Click(object sender, RoutedEventArgs e) => OpenInExplorer(null);

    // #3 explorer 인자 인젝션 방지: 경로 정규화 + 존재 검증 + ArgumentList/UseShellExecute
    private void OpenInExplorer(string? selectFile)
    {
        try
        {
            var folder = Path.GetFullPath(_config.OutputFolder);
            if (!Directory.Exists(folder)) return;
            if (!string.IsNullOrEmpty(selectFile) && File.Exists(selectFile))
            {
                var psi = new System.Diagnostics.ProcessStartInfo("explorer.exe") { UseShellExecute = false };
                psi.ArgumentList.Add($"/select,{selectFile}");
                System.Diagnostics.Process.Start(psi);
            }
            else
            {
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
                {
                    FileName = folder,
                    UseShellExecute = true,
                });
            }
        }
        catch { }
    }

    private void Settings_Click(object sender, RoutedEventArgs e)
    {
        var w = new SettingsWindow(_config, ClearBrowsingDataAsync) { Owner = this };
        if (w.ShowDialog() == true)
        {
            _config = w.Config;
            ConfigStore.Save(_config);
            _resolver = new SearchEngineResolver(_config.SearchEngine); // T1-4 즉시 반영
            _manager.UpdateMaxConcurrent(_config.MaxConcurrentDownloads); // #19 런타임 반영
            if (w.ThemeChanged) RestartApp();
        }
    }

    // 테마 변경 등은 리소스가 StaticResource 로 물려있어 런타임 전환이 어려움 → 재시작으로 적용.
    private static void RestartApp()
    {
        var exe = Environment.ProcessPath;
        if (!string.IsNullOrEmpty(exe))
            System.Diagnostics.Process.Start(exe);
        Application.Current.Shutdown();
    }

    private static string Trunc(string s, int n) => string.IsNullOrEmpty(s) ? "" : (s.Length <= n ? s : s[..n] + "…");
}