using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using AxCopilot.Models;
using AxCopilot.Services;
using AxCopilot.Services.Agent;

namespace AxCopilot.Views;

public partial class ChatWindow
{
    private static string BuildSlashSkillLabel(SkillDefinition skill)
    {
        var badge = string.Equals(skill.ExecutionContext, "fork", StringComparison.OrdinalIgnoreCase)
            ? "[FORK]"
            : "[DIRECT]";
        var baseLabel = $"{badge} {skill.Label}";
        if (!string.IsNullOrWhiteSpace(skill.ArgumentHint))
            baseLabel = $"{baseLabel} {skill.ArgumentHint.Trim()}";
        return skill.IsAvailable ? baseLabel : $"{baseLabel} {skill.UnavailableHint}";
    }

    private bool GetSlashSectionExpanded(string sectionKey, bool defaultValue = true)
    {
        var map = _settings.Settings.Llm.SlashPaletteSections;
        if (map != null && map.TryGetValue(sectionKey, out var expanded))
            return expanded;
        return defaultValue;
    }

    private void SetSlashSectionExpanded(string sectionKey, bool expanded)
    {
        var map = _settings.Settings.Llm.SlashPaletteSections ??= new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);
        map[sectionKey] = expanded;
        ScheduleSettingsSave();
    }

    private bool AreAllSlashSectionsExpanded()
    {
        var commandsExpanded = GetSlashSectionExpanded("slash_commands", true);
        var skillsExpanded = GetSlashSectionExpanded("slash_skills", true);
        return commandsExpanded && skillsExpanded;
    }

    private void BtnSlashToggleGroups_Click(object sender, RoutedEventArgs e)
    {
        var expandAll = !AreAllSlashSectionsExpanded();
        SetSlashSectionExpanded("slash_commands", expandAll);
        SetSlashSectionExpanded("slash_skills", expandAll);
        _slashPalette.SelectedIndex = GetFirstVisibleSlashIndex(_slashPalette.Matches);
        RenderSlashPage();
    }

    private void BtnSlashReset_Click(object sender, RoutedEventArgs e)
    {
        _settings.Settings.Llm.FavoriteSlashCommands.Clear();
        _settings.Settings.Llm.RecentSlashCommands.Clear();
        ScheduleSettingsSave();
        _slashPalette.SelectedIndex = GetFirstVisibleSlashIndex(_slashPalette.Matches);
        RenderSlashPage();
    }

    private Dictionary<string, int> BuildRecentSlashRankMap()
    {
        var map = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
        var recent = _settings.Settings.Llm.RecentSlashCommands;
        for (var i = 0; i < recent.Count; i++)
        {
            var key = recent[i]?.Trim();
            if (string.IsNullOrWhiteSpace(key) || map.ContainsKey(key))
                continue;
            map[key] = i; // index 낮을수록 최근
        }
        return map;
    }

    private Dictionary<string, int> BuildFavoriteSlashRankMap()
    {
        var map = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
        var fav = _settings.Settings.Llm.FavoriteSlashCommands;
        var maxFavorites = Math.Clamp(_settings.Settings.Llm.MaxFavoriteSlashCommands, 1, 30);
        for (var i = 0; i < fav.Count; i++)
        {
            if (i >= maxFavorites)
                break;
            var key = fav[i]?.Trim();
            if (string.IsNullOrWhiteSpace(key) || map.ContainsKey(key))
                continue;
            map[key] = i; // index 낮을수록 우선
        }
        return map;
    }

    private void RegisterRecentSlashCommand(string cmd)
    {
        if (string.IsNullOrWhiteSpace(cmd))
            return;
        var recent = _settings.Settings.Llm.RecentSlashCommands;
        var maxRecent = Math.Clamp(_settings.Settings.Llm.MaxRecentSlashCommands, 5, 50);
        recent.RemoveAll(x => string.Equals(x, cmd, StringComparison.OrdinalIgnoreCase));
        recent.Insert(0, cmd);
        if (recent.Count > maxRecent)
            recent.RemoveRange(maxRecent, recent.Count - maxRecent);
        ScheduleSettingsSave();
    }

    private int GetFirstVisibleSlashIndex(IReadOnlyList<(string Cmd, string Label, bool IsSkill)> matches)
    {
        var commandExpanded = GetSlashSectionExpanded("slash_commands", true);
        var skillExpanded = GetSlashSectionExpanded("slash_skills", true);
        for (var i = 0; i < matches.Count; i++)
        {
            var visible = matches[i].IsSkill ? skillExpanded : commandExpanded;
            if (visible)
                return i;
        }
        return -1;
    }

    private bool IsSlashItemVisibleByIndex(int index)
    {
        if (index < 0 || index >= _slashPalette.Matches.Count)
            return false;
        var item = _slashPalette.Matches[index];
        return item.IsSkill
            ? GetSlashSectionExpanded("slash_skills", true)
            : GetSlashSectionExpanded("slash_commands", true);
    }

    private IReadOnlyList<int> GetVisibleSlashOrderedIndices() => _slashVisibleAbsoluteOrder;

    /// <summary>현재 슬래시 명령어 항목을 스크롤 리스트로 렌더링합니다.</summary>
    private void RenderSlashPage()
    {
        SlashItems.Items.Clear();
        _slashVisibleItemByAbsoluteIndex.Clear();
        _slashVisibleAbsoluteOrder.Clear();
        var total = _slashPalette.Matches.Count;
        var totalSkills = _slashPalette.Matches.Count(x => x.IsSkill);
        var totalCommands = total - totalSkills;
        var favoriteRank = BuildFavoriteSlashRankMap();
        var recentRank = BuildRecentSlashRankMap();
        var expressionLevel = (_settings.Settings.Llm.AgentUiExpressionLevel ?? "balanced").Trim().ToLowerInvariant();

        SlashPopupTitle.Text = "명령 및 스킬";
        SlashPopupHint.Text = expressionLevel switch
        {
            "simple" => $"명령 {totalCommands} · 스킬 {totalSkills}",
            "rich" => $"명령 {totalCommands}개 · 스킬 {totalSkills}개 · Enter 실행 · 방향키 이동",
            _ => $"명령 {totalCommands}개 · 스킬 {totalSkills}개 · Enter 실행",
        };

        var commandsExpanded = GetSlashSectionExpanded("slash_commands", true);
        var skillsExpanded = GetSlashSectionExpanded("slash_skills", true);
        if (SlashToggleGroupsLabel != null)
            SlashToggleGroupsLabel.Text = (commandsExpanded && skillsExpanded) ? "전체 접기" : "전체 펼치기";

        Border CreateSlashSectionHeader(string key, string title, int count, bool expanded)
        {
            var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
            var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
            var hoverBrushItem = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.LightGray;

            var header = new Border
            {
                Background = Brushes.Transparent,
                BorderBrush = Brushes.Transparent,
                BorderThickness = new Thickness(0),
                CornerRadius = new CornerRadius(8),
                Padding = new Thickness(8, 6, 8, 6),
                Margin = new Thickness(0, 4, 0, 2),
                Cursor = Cursors.Hand,
            };
            var grid = new Grid();
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });

            grid.Children.Add(new TextBlock
            {
                Text = expanded ? "\uE70D" : "\uE76C",
                FontFamily = s_segoeIconFont,
                FontSize = 11,
                Foreground = secondaryText,
                Margin = new Thickness(0, 0, 6, 0),
                VerticalAlignment = VerticalAlignment.Center,
            });
            var titleText = new TextBlock
            {
                Text = $"{title} {count}",
                FontSize = 10.5,
                FontWeight = FontWeights.SemiBold,
                Foreground = primaryText,
                VerticalAlignment = VerticalAlignment.Center,
            };
            Grid.SetColumn(titleText, 1);
            grid.Children.Add(titleText);
            var metaText = new TextBlock
            {
                Text = expanded ? "접기" : "펼치기",
                FontSize = 9.5,
                Foreground = secondaryText,
                VerticalAlignment = VerticalAlignment.Center,
            };
            Grid.SetColumn(metaText, 2);
            grid.Children.Add(metaText);

            header.Child = grid;
            header.MouseEnter += (_, _) => header.Background = hoverBrushItem;
            header.MouseLeave += (_, _) => header.Background = Brushes.Transparent;
            header.MouseLeftButtonDown += (_, _) =>
            {
                SetSlashSectionExpanded(key, !expanded);
                _slashPalette.SelectedIndex = GetFirstVisibleSlashIndex(_slashPalette.Matches);
                RenderSlashPage();
            };
            return header;
        }

        void AddSlashItem(int i)
        {
            var (cmd, label, isSkill) = _slashPalette.Matches[i];
            var isFavorite = favoriteRank.ContainsKey(cmd);
            var isRecent = recentRank.ContainsKey(cmd);
            var capturedCmd = cmd;
            var skillDef = isSkill ? SkillService.Find(cmd.TrimStart('/')) : null;
            var skillAvailable = skillDef?.IsAvailable ?? true;

            var absoluteIndex = i;
            var hoverBrushItem = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.LightGray;
            var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
            var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
            var accent = TryFindResource("AccentColor") as Brush ?? Brushes.Blue;

            var item = new Border
            {
                Background = Brushes.Transparent,
                BorderBrush = TryFindResource("BorderColor") as Brush ?? Brushes.Gray,
                BorderThickness = new Thickness(0, 0, 0, 1),
                CornerRadius = new CornerRadius(0),
                Padding = new Thickness(8, 9, 8, 9),
                Margin = new Thickness(0, 0, 0, 0),
                Cursor = skillAvailable ? Cursors.Hand : Cursors.Arrow,
                Opacity = skillAvailable ? 1.0 : 0.5,
            };
            var itemGrid = new Grid();
            itemGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            itemGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });

            var leftStack = new StackPanel();
            var titleRow = new StackPanel { Orientation = Orientation.Horizontal };
            titleRow.Children.Add(new TextBlock
            {
                Text = isSkill ? "\uE768" : "\uE9CE",
                FontFamily = s_segoeIconFont,
                FontSize = 11,
                Foreground = skillAvailable ? accent : secondaryText,
                VerticalAlignment = VerticalAlignment.Center,
                Margin = new Thickness(0, 0, 8, 0),
            });
            titleRow.Children.Add(new TextBlock
            {
                Text = cmd,
                FontSize = 12,
                FontWeight = FontWeights.SemiBold,
                Foreground = skillAvailable ? primaryText : secondaryText,
                VerticalAlignment = VerticalAlignment.Center,
            });
            if (isFavorite)
            {
                titleRow.Children.Add(new Border
                {
                    Background = BrushFromHex("#FEF3C7"),
                    BorderBrush = BrushFromHex("#F59E0B"),
                    BorderThickness = new Thickness(1),
                    CornerRadius = new CornerRadius(8),
                    Padding = new Thickness(5, 0, 5, 0),
                    Margin = new Thickness(6, 0, 0, 0),
                    Child = new TextBlock
                    {
                        Text = "핀",
                        FontSize = 9.5,
                        Foreground = BrushFromHex("#92400E"),
                    }
                });
            }
            if (isRecent)
            {
                titleRow.Children.Add(new Border
                {
                    Background = BrushFromHex("#EEF2FF"),
                    BorderBrush = BrushFromHex("#C7D2FE"),
                    BorderThickness = new Thickness(1),
                    CornerRadius = new CornerRadius(8),
                    Padding = new Thickness(5, 0, 5, 0),
                    Margin = new Thickness(6, 0, 0, 0),
                    Child = new TextBlock
                    {
                        Text = "최근",
                        FontSize = 9.5,
                        Foreground = BrushFromHex("#3730A3"),
                    }
                });
            }
            leftStack.Children.Add(titleRow);
            leftStack.Children.Add(new TextBlock
            {
                Text = label,
                FontSize = 11,
                Foreground = secondaryText,
                VerticalAlignment = VerticalAlignment.Center,
                Margin = new Thickness(20, 2, 0, 0),
                TextTrimming = TextTrimming.CharacterEllipsis,
            });
            Grid.SetColumn(leftStack, 0);
            itemGrid.Children.Add(leftStack);

            var pinToggle = new Border
            {
                Background = Brushes.Transparent,
                CornerRadius = new CornerRadius(6),
                Padding = new Thickness(6, 4, 6, 4),
                Margin = new Thickness(6, 0, 0, 0),
                Cursor = Cursors.Hand,
                Child = new TextBlock
                {
                    Text = isFavorite ? "\uE77A" : "\uE718",
                    FontFamily = s_segoeIconFont,
                    FontSize = 11,
                    Foreground = isFavorite ? BrushFromHex("#B45309") : secondaryText,
                    VerticalAlignment = VerticalAlignment.Center,
                },
                ToolTip = isFavorite ? "핀 해제" : "핀 고정",
            };
            pinToggle.MouseEnter += (_, _) => pinToggle.Background = hoverBrushItem;
            pinToggle.MouseLeave += (_, _) => pinToggle.Background = Brushes.Transparent;
            pinToggle.MouseLeftButtonDown += (s, e) =>
            {
                e.Handled = true;
                ToggleSlashFavorite(capturedCmd);
            };
            Grid.SetColumn(pinToggle, 1);
            itemGrid.Children.Add(pinToggle);

            item.Child = itemGrid;

            if (skillAvailable)
            {
                item.MouseEnter += (_, _) =>
                {
                    _slashPalette.SelectedIndex = absoluteIndex;
                    UpdateSlashSelectionVisualState();
                };
                item.MouseLeave += (_, _) => UpdateSlashSelectionVisualState();
                item.MouseLeftButtonDown += (_, _) =>
                {
                    _slashPalette.SelectedIndex = absoluteIndex;
                    ExecuteSlashSelectedItem();
                };
            }

            SlashItems.Items.Add(item);
            _slashVisibleItemByAbsoluteIndex[absoluteIndex] = item;
            _slashVisibleAbsoluteOrder.Add(absoluteIndex);
        }

        SlashItems.Items.Add(CreateSlashSectionHeader("slash_commands", "명령", totalCommands, commandsExpanded));
        if (commandsExpanded)
        {
            var commandIndices = Enumerable.Range(0, total)
                .Where(i => !_slashPalette.Matches[i].IsSkill)
                .OrderBy(i => favoriteRank.TryGetValue(_slashPalette.Matches[i].Cmd, out var favRank) ? favRank : int.MaxValue)
                .ThenBy(i => recentRank.TryGetValue(_slashPalette.Matches[i].Cmd, out var rank) ? rank : int.MaxValue)
                .ThenBy(i => _slashPalette.Matches[i].Cmd, StringComparer.OrdinalIgnoreCase);
            foreach (var i in commandIndices)
            {
                AddSlashItem(i);
            }
        }

        SlashItems.Items.Add(CreateSlashSectionHeader("slash_skills", "스킬", totalSkills, skillsExpanded));
        if (skillsExpanded)
        {
            var skillIndices = Enumerable.Range(0, total)
                .Where(i => _slashPalette.Matches[i].IsSkill)
                .OrderBy(i => favoriteRank.TryGetValue(_slashPalette.Matches[i].Cmd, out var favRank) ? favRank : int.MaxValue)
                .ThenBy(i => recentRank.TryGetValue(_slashPalette.Matches[i].Cmd, out var rank) ? rank : int.MaxValue)
                .ThenBy(i => _slashPalette.Matches[i].Cmd, StringComparer.OrdinalIgnoreCase);
            foreach (var i in skillIndices)
            {
                AddSlashItem(i);
            }
        }

        var visibleCommandCount = commandsExpanded ? totalCommands : 0;
        var visibleSkillCount = skillsExpanded ? totalSkills : 0;
        if (visibleCommandCount + visibleSkillCount == 0)
        {
            SlashPopupFooter.Text = "모든 그룹이 접혀 있습니다 · 우측 상단에서 전체 펼치기";
        }
        else
        {
            SlashPopupFooter.Text = $"Enter 실행 · ↑↓/PgUp/PgDn 이동 · Home/End · Esc 닫기 · 표시 {visibleCommandCount + visibleSkillCount}/{total}";
        }

        UpdateSlashSelectionVisualState();
        EnsureSlashSelectionVisible();
    }

    /// <summary>슬래시 팝업 마우스 휠 스크롤 처리.</summary>
    private void SlashPopup_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
    {
        e.Handled = true;
        SlashPopup_ScrollByDelta(e.Delta);
    }

    private void MoveSlashSelection(int direction)
    {
        var visibleOrder = GetVisibleSlashOrderedIndices();
        if (visibleOrder.Count == 0)
            return;

        var currentPosition = -1;
        for (var i = 0; i < visibleOrder.Count; i++)
        {
            if (visibleOrder[i] != _slashPalette.SelectedIndex)
                continue;
            currentPosition = i;
            break;
        }
        if (currentPosition < 0)
        {
            _slashPalette.SelectedIndex = visibleOrder[0];
            return;
        }

        if (direction < 0 && currentPosition > 0)
            _slashPalette.SelectedIndex = visibleOrder[currentPosition - 1];
        else if (direction > 0 && currentPosition < visibleOrder.Count - 1)
            _slashPalette.SelectedIndex = visibleOrder[currentPosition + 1];
    }

    private int? FindSlashIndexClosestToViewportTop()
    {
        if (SlashScrollViewer == null || _slashVisibleAbsoluteOrder.Count == 0)
            return null;

        var bestIndex = -1;
        var bestDistance = double.MaxValue;
        foreach (var absoluteIndex in _slashVisibleAbsoluteOrder)
        {
            if (!_slashVisibleItemByAbsoluteIndex.TryGetValue(absoluteIndex, out var item))
                continue;

            try
            {
                var bounds = item.TransformToAncestor(SlashScrollViewer)
                    .TransformBounds(new Rect(0, 0, item.ActualWidth, item.ActualHeight));

                // 뷰포트 상단에 가장 가까운 가시 항목을 선택 기준으로 사용.
                var distance = Math.Abs(bounds.Top);
                if (distance < bestDistance && bounds.Bottom >= 0)
                {
                    bestDistance = distance;
                    bestIndex = absoluteIndex;
                }
            }
            catch
            {
                // 레이아웃 갱신 중 transform 예외는 무시.
            }
        }

        return bestIndex >= 0 ? bestIndex : null;
    }

    /// <summary>슬래시 팝업을 Delta 방향으로 스크롤합니다.</summary>
    private void SlashPopup_ScrollByDelta(int delta)
    {
        if (_slashPalette.Matches.Count == 0)
            return;

        if (GetVisibleSlashOrderedIndices().Count == 0)
        {
            if (SlashScrollViewer != null)
                SlashScrollViewer.ScrollToVerticalOffset(Math.Max(0, SlashScrollViewer.VerticalOffset - delta / 3.0));
            return;
        }

        // 터치패드/마우스 환경 모두에서 체감이 유사하도록 스크롤뷰도 함께 이동.
        if (SlashScrollViewer != null)
        {
            var target = Math.Max(0, Math.Min(
                SlashScrollViewer.ScrollableHeight,
                SlashScrollViewer.VerticalOffset - (delta / 3.0)));
            SlashScrollViewer.ScrollToVerticalOffset(target);
        }

        var steps = Math.Max(1, (int)Math.Ceiling(Math.Abs(delta) / 120.0));
        var direction = delta > 0 ? -1 : 1;
        for (var i = 0; i < steps; i++)
            MoveSlashSelection(direction);

        var viewportTopIndex = FindSlashIndexClosestToViewportTop();
        if (viewportTopIndex.HasValue)
            _slashPalette.SelectedIndex = viewportTopIndex.Value;

        UpdateSlashSelectionVisualState();
        EnsureSlashSelectionVisible();
    }

    /// <summary>키보드로 선택된 슬래시 아이템을 실행합니다.</summary>
    private void ExecuteSlashSelectedItem()
    {
        var absoluteIdx = _slashPalette.SelectedIndex;
        if (absoluteIdx < 0 || absoluteIdx >= _slashPalette.Matches.Count) return;

        var (cmd, _, isSkill) = _slashPalette.Matches[absoluteIdx];
        var skillDef = isSkill ? SkillService.Find(cmd.TrimStart('/')) : null;
        var skillAvailable = skillDef?.IsAvailable ?? true;
        if (!skillAvailable) return;
        RegisterRecentSlashCommand(cmd);

        SlashPopup.IsOpen = false;
        _slashPalette.SelectedIndex = -1;

        if (cmd.Equals("/help", StringComparison.OrdinalIgnoreCase))
        {
            InputBox.Text = "";
            ShowSlashHelpWindow();
            return;
        }
        ShowSlashChip(cmd);
        InputBox.Focus();
    }

    private void EnsureSlashSelectionVisible()
    {
        if (SlashScrollViewer == null || _slashPalette.SelectedIndex < 0)
            return;

        if (!_slashVisibleItemByAbsoluteIndex.TryGetValue(_slashPalette.SelectedIndex, out var item))
            return;

        if (!IsVisualDescendantOf(item, SlashScrollViewer))
            return;

        Rect bounds;
        try
        {
            bounds = item.TransformToAncestor(SlashScrollViewer)
                .TransformBounds(new Rect(0, 0, item.ActualWidth, item.ActualHeight));
        }
        catch
        {
            // 렌더 트리 갱신 중에는 transform이 실패할 수 있어 조용히 무시.
            return;
        }

        if (bounds.Top < 0)
            SlashScrollViewer.ScrollToVerticalOffset(SlashScrollViewer.VerticalOffset + bounds.Top - 8);
        else if (bounds.Bottom > SlashScrollViewer.ViewportHeight)
            SlashScrollViewer.ScrollToVerticalOffset(SlashScrollViewer.VerticalOffset + (bounds.Bottom - SlashScrollViewer.ViewportHeight) + 8);
    }

    private static bool IsVisualDescendantOf(DependencyObject? child, DependencyObject? parent)
    {
        if (child == null || parent == null)
            return false;

        var current = child;
        while (current != null)
        {
            if (ReferenceEquals(current, parent))
                return true;
            current = VisualTreeHelper.GetParent(current);
        }

        return false;
    }

    private void UpdateSlashSelectionVisualState()
    {
        if (_slashVisibleItemByAbsoluteIndex.Count == 0)
            return;

        var selectedIndex = _slashPalette.SelectedIndex;
        var hoverBrushItem = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.LightGray;
        var borderBrush = TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
        var accent = TryFindResource("AccentColor") as Brush ?? Brushes.Blue;

        foreach (var (absoluteIndex, element) in _slashVisibleItemByAbsoluteIndex)
        {
            if (element is not Border border)
                continue;

            var selected = absoluteIndex == selectedIndex;
            border.Background = selected ? hoverBrushItem : Brushes.Transparent;
            border.BorderBrush = selected ? accent : borderBrush;
            border.BorderThickness = selected ? new Thickness(2, 0, 0, 1) : new Thickness(0, 0, 0, 1);
        }
    }

    /// <summary>슬래시 명령어 즐겨찾기를 토글하고 설정을 저장합니다.</summary>
    private void ToggleSlashFavorite(string cmd)
    {
        var favs = _settings.Settings.Llm.FavoriteSlashCommands;
        var maxFavorites = Math.Clamp(_settings.Settings.Llm.MaxFavoriteSlashCommands, 1, 30);
        var existing = favs.FirstOrDefault(f => f.Equals(cmd, StringComparison.OrdinalIgnoreCase));
        if (existing != null)
            favs.Remove(existing);
        else
        {
            favs.Add(cmd);
            if (favs.Count > maxFavorites)
                favs.RemoveRange(maxFavorites, favs.Count - maxFavorites);
        }

        ScheduleSettingsSave();

        if (SlashPopup.IsOpen)
        {
            RenderSlashPage();
            return;
        }

        // 팝업이 닫힌 경우에만 TextChanged 트리거
        var currentText = InputBox.Text;
        InputBox.TextChanged -= InputBox_TextChanged;
        InputBox.Text = "";
        InputBox.TextChanged += InputBox_TextChanged;
        InputBox.Text = currentText;
    }

    /// <summary>슬래시 명령어 칩을 표시하고 InputBox를 비웁니다.</summary>
    private void ShowSlashChip(string cmd)
    {
        _slashPalette.ActiveCommand = cmd;
        SlashChipText.Text = cmd;
        SlashCommandChip.Visibility = Visibility.Visible;

        // 칩 너비 측정 후 InputBox 왼쪽 여백 조정
        SlashCommandChip.UpdateLayout();
        var chipRight = SlashCommandChip.Margin.Left + SlashCommandChip.ActualWidth + 6;
        InputBox.Padding = new Thickness(chipRight, 10, 14, 10);
        InputBox.Text = "";
    }

    /// <summary>슬래시 명령어 칩을 숨깁니다.</summary>
    /// <param name="restoreText">true이면 InputBox에 명령어 텍스트를 복원합니다.</param>
    private void HideSlashChip(bool restoreText = false)
    {
        if (_slashPalette.ActiveCommand == null) return;
        var prev = _slashPalette.ActiveCommand;
        _slashPalette.ActiveCommand = null;
        SlashCommandChip.Visibility = Visibility.Collapsed;
        InputBox.Padding = new Thickness(14, 10, 14, 10);
        if (restoreText)
        {
            InputBox.Text = prev + " ";
            InputBox.CaretIndex = InputBox.Text.Length;
        }
    }
}