using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using AxCopilot.Models;
using AxCopilot.Services;

namespace AxCopilot.Views;

public partial class ChatWindow
{
    private UIElement CreateMessageBubbleElement(string role, string content, bool animate = true, ChatMessage? message = null)
    {
        var beforeCount = GetTranscriptElementCount();
        AddMessageBubble(role, content, animate, message);
        var element = GetTranscriptElementAt(beforeCount)
                      ?? throw new InvalidOperationException("메시지 버블을 생성하지 못했습니다.");
        RemoveTranscriptElementAt(beforeCount);
        return element;
    }

    private void AddMessageBubble(string role, string content, bool animate = true, ChatMessage? message = null)
    {
        var isUser = role == "user";
        var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
        var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
        var itemBg = TryFindResource("ItemBackground") as Brush
                     ?? new SolidColorBrush(Color.FromRgb(0x2A, 0x2B, 0x40));
        var borderBrush = TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
        var hintBg = TryFindResource("HintBackground") as Brush
                     ?? new SolidColorBrush(Color.FromArgb(0x18, 0xFF, 0xFF, 0xFF));
        var accentBrush = TryFindResource("AccentColor") as Brush ?? Brushes.CornflowerBlue;
        var userBubbleBg = hintBg;
        var assistantBubbleBg = itemBg;

        if (isUser)
        {
            var msgMaxWidth = GetMessageMaxWidth();
            var wrapper = new StackPanel
            {
                HorizontalAlignment = HorizontalAlignment.Right,
                MaxWidth = msgMaxWidth * 0.85,
                Margin = new Thickness(60, 8, 12, 10),  // 좌측 여백 넓게 → 우측에 붙음
            };

            var bubble = new Border
            {
                BorderBrush = borderBrush,
                BorderThickness = new Thickness(0),
                CornerRadius = new CornerRadius(18),
                Padding = new Thickness(16, 12, 16, 12),
                HorizontalAlignment = HorizontalAlignment.Right,
            };
            // DynamicResource 방식으로 바인딩 — 테마 전환 시 기존 버블도 자동 업데이트
            bubble.SetResourceReference(Border.BackgroundProperty, "HintBackground");

            if (string.Equals(_activeTab, "Cowork", StringComparison.OrdinalIgnoreCase) ||
                string.Equals(_activeTab, "Code", StringComparison.OrdinalIgnoreCase))
            {
                var userCodeBgBrush = TryFindResource("HintBackground") as Brush ?? Brushes.DarkGray;
                MarkdownRenderer.EnableFilePathHighlight =
                    (System.Windows.Application.Current as App)?.SettingsService?.Settings.Llm.EnableFilePathHighlight ?? true;
                MarkdownRenderer.EnableCodeSymbolHighlight = true;
                bubble.Child = MarkdownRenderer.Render(content, primaryText, secondaryText, accentBrush, userCodeBgBrush);
            }
            else
            {
                MarkdownRenderer.EnableCodeSymbolHighlight = false;
                bubble.Child = new TextBlock
                {
                    Text = content,
                    TextAlignment = TextAlignment.Left,
                    FontSize = 14,
                    Foreground = primaryText,
                    TextWrapping = TextWrapping.Wrap,
                    LineHeight = 22,
                };
            }

            wrapper.Children.Add(bubble);

            var userActionBar = new StackPanel
            {
                Orientation = Orientation.Horizontal,
                HorizontalAlignment = HorizontalAlignment.Right,
                Opacity = 0,
                Margin = new Thickness(0, 2, 0, 0),
            };
            var capturedUserContent = content;
            var userBtnColor = secondaryText;
            userActionBar.Children.Add(CreateActionButton("\uE8C8", "복사", userBtnColor, () =>
            {
                try { Clipboard.SetText(capturedUserContent); } catch { }
            }));
            userActionBar.Children.Add(CreateActionButton("\uE70F", "편집", userBtnColor,
                () => EnterEditMode(wrapper, capturedUserContent)));

            var userBottomBar = new Grid { Margin = new Thickness(0, 1, 0, 0) };
            userBottomBar.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            userBottomBar.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
            userBottomBar.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
            var timestamp = message?.Timestamp ?? DateTime.Now;
            Grid.SetColumn(userActionBar, 1);
            userBottomBar.Children.Add(userActionBar);

            var timestampText = new TextBlock
            {
                Text = timestamp.ToString("HH:mm"),
                FontSize = 10.5,
                Opacity = 0,
                Foreground = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray,
                HorizontalAlignment = HorizontalAlignment.Right,
                VerticalAlignment = VerticalAlignment.Center,
                Margin = new Thickness(8, 0, 2, 1),
            };
            Grid.SetColumn(timestampText, 2);
            userBottomBar.Children.Add(timestampText);
            wrapper.Children.Add(userBottomBar);
            wrapper.MouseEnter += (_, _) =>
            {
                userActionBar.BeginAnimation(OpacityProperty,
                    new DoubleAnimation(0.7, TimeSpan.FromMilliseconds(150)));
                timestampText.BeginAnimation(OpacityProperty,
                    new DoubleAnimation(0.5, TimeSpan.FromMilliseconds(150)));
            };
            wrapper.MouseLeave += (_, _) =>
            {
                var targetOpacity = ReferenceEquals(_selectedMessageActionBar, userActionBar) ? 1.0 : 0.0;
                userActionBar.BeginAnimation(OpacityProperty,
                    new DoubleAnimation(targetOpacity, TimeSpan.FromMilliseconds(200)));
                timestampText.BeginAnimation(OpacityProperty,
                    new DoubleAnimation(0, TimeSpan.FromMilliseconds(200)));
            };
            wrapper.MouseLeftButtonUp += (_, _) => SelectMessageActionBar(userActionBar, bubble);

            var userContent = content;
            wrapper.MouseRightButtonUp += (_, re) =>
            {
                re.Handled = true;
                ShowMessageContextMenu(userContent, "user");
            };

            if (animate)
                ApplyMessageEntryAnimation(wrapper);
            if (message?.MsgId != null) _elementCache[$"m_{message.MsgId}"] = wrapper;
            AddTranscriptElement(wrapper);
            return;
        }

        if (message != null && IsCompactionMetaMessage(message))
        {
            var compactCard = CreateCompactionMetaCard(message, primaryText, secondaryText, hintBg, borderBrush, accentBrush);
            if (animate)
                ApplyMessageEntryAnimation(compactCard);
            if (message.MsgId != null) _elementCache[$"m_{message.MsgId}"] = compactCard;
            AddTranscriptElement(compactCard);
            return;
        }

        var assistantMaxWidth = GetMessageMaxWidth();
        var container = new StackPanel
        {
            HorizontalAlignment = HorizontalAlignment.Left,
            MaxWidth = assistantMaxWidth,
            Margin = new Thickness(12, 10, 60, 10),  // 우측 여백 넓게 → 좌측에 붙음
        };
        if (animate)
            ApplyMessageEntryAnimation(container);

        var (agentName, _, _) = GetAgentIdentity();
        var (iconHost, iconPixels, iconGlows, iconRotate, iconScale) = CreateMiniLauncherIconEx(4.0, "none");
        var header = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(2, 4, 0, 0) };
        header.Children.Add(iconHost);
        header.Children.Add(new TextBlock
        {
            Text = agentName,
            FontSize = 12,
            FontWeight = FontWeights.Medium,
            Foreground = secondaryText,
            Margin = new Thickness(6, 0, 0, 0),
            VerticalAlignment = VerticalAlignment.Center,
        });
        // 아이콘 애니메이션 적용
        var canvas = iconHost.Children.OfType<Canvas>().FirstOrDefault();
        if (canvas != null)
        {
            var animState = new ChatIconAnimState
            {
                Host = iconHost, Canvas = canvas, Pixels = iconPixels,
                Glows = iconGlows, Rotate = iconRotate, Scale = iconScale,
                IsRandomMode = _settings.Settings.Launcher.EnableChatIconRandomAnimation,
            };
            StartChatIconAnimation(animState);
        }

        var contentCard = new Border
        {
            Background = Brushes.Transparent,
            BorderThickness = new Thickness(0),
            CornerRadius = new CornerRadius(0),
            Padding = new Thickness(2, 4, 2, 4),
        };
        var contentStack = new StackPanel();

        var app = System.Windows.Application.Current as App;
        MarkdownRenderer.EnableFilePathHighlight =
            app?.SettingsService?.Settings.Llm.EnableFilePathHighlight ?? true;
        MarkdownRenderer.EnableCodeSymbolHighlight =
            string.Equals(_activeTab, "Cowork", StringComparison.OrdinalIgnoreCase) ||
            string.Equals(_activeTab, "Code", StringComparison.OrdinalIgnoreCase);
        var codeBgBrush = TryFindResource("HintBackground") as Brush ?? Brushes.DarkGray;
        if (IsBranchContextMessage(content))
        {
            var branchRun = GetAgentRunStateById(message?.MetaRunId) ?? GetLatestBranchContextRun();
            var branchFiles = GetBranchContextFilePaths(message?.MetaRunId ?? branchRun?.RunId, 3);
            var branchCard = new Border
            {
                Background = hintBg,
                BorderBrush = borderBrush,
                BorderThickness = new Thickness(1),
                CornerRadius = new CornerRadius(14),
                Padding = new Thickness(12, 10, 12, 10),
                Margin = new Thickness(0, 0, 0, 6),
            };
            var branchStack = new StackPanel();
            branchStack.Children.Add(new TextBlock
            {
                Text = "분기 컨텍스트",
                FontSize = 11,
                FontWeight = FontWeights.SemiBold,
                Foreground = primaryText,
                Margin = new Thickness(0, 0, 0, 6),
            });
            branchStack.Children.Add(MarkdownRenderer.RenderSelectable(content, primaryText, secondaryText, accentBrush, codeBgBrush));

            if (branchFiles.Count > 0)
            {
                var filesWrap = new WrapPanel { Margin = new Thickness(0, 8, 0, 0) };
                foreach (var path in branchFiles)
                {
                    var fileButton = new Button
                    {
                        Background = itemBg,
                        BorderBrush = borderBrush,
                        BorderThickness = new Thickness(1),
                        Padding = new Thickness(8, 3, 8, 3),
                        Margin = new Thickness(0, 0, 6, 6),
                        Cursor = Cursors.Hand,
                        ToolTip = path,
                        Content = new TextBlock
                        {
                            Text = System.IO.Path.GetFileName(path),
                            FontSize = 10,
                            FontWeight = FontWeights.SemiBold,
                            Foreground = primaryText,
                        },
                    };
                    var capturedPath = path;
                    fileButton.Click += (_, _) => OpenRunFilePath(capturedPath);
                    filesWrap.Children.Add(fileButton);
                }
                branchStack.Children.Add(filesWrap);
            }

            if (branchRun != null)
            {
                var actionsWrap = new WrapPanel { Margin = new Thickness(0, 8, 0, 0) };

                var followUpButton = new Button
                {
                    Background = itemBg,
                    BorderBrush = borderBrush,
                    BorderThickness = new Thickness(1),
                    Padding = new Thickness(8, 3, 8, 3),
                    Margin = new Thickness(0, 0, 6, 6),
                    Cursor = Cursors.Hand,
                    Content = new TextBlock
                    {
                        Text = "후속 작업 큐에 넣기",
                        FontSize = 10,
                        FontWeight = FontWeights.SemiBold,
                        Foreground = primaryText,
                    },
                };
                var capturedBranchRun = branchRun;
                followUpButton.Click += (_, _) => EnqueueFollowUpFromRun(capturedBranchRun);
                actionsWrap.Children.Add(followUpButton);

                var timelineButton = new Button
                {
                    Background = itemBg,
                    BorderBrush = borderBrush,
                    BorderThickness = new Thickness(1),
                    Padding = new Thickness(8, 3, 8, 3),
                    Margin = new Thickness(0, 0, 6, 6),
                    Cursor = Cursors.Hand,
                    Content = new TextBlock
                    {
                        Text = "관련 로그로 이동",
                        FontSize = 10,
                        FontWeight = FontWeights.SemiBold,
                        Foreground = primaryText,
                    },
                };
                timelineButton.Click += (_, _) => ScrollToRunInTimeline(capturedBranchRun.RunId);
                actionsWrap.Children.Add(timelineButton);

                branchStack.Children.Add(actionsWrap);
            }

            branchCard.Child = branchStack;
            contentStack.Children.Add(branchCard);
        }
        else
        {
            contentStack.Children.Add(MarkdownRenderer.RenderSelectable(content, primaryText, secondaryText, accentBrush, codeBgBrush));
        }

        contentCard.Child = contentStack;
        container.Children.Add(contentCard);

        // 에이전트 이름 푸터 (메시지 본문 아래)
        container.Children.Add(header);

        // 어시스턴트 메시지에 파일 경로가 포함되어 있으면 프리뷰/열기 퀵 액션 추가
        var outputFilePath = ExtractOutputFilePathFromContent(content);
        if (!string.IsNullOrEmpty(outputFilePath) && System.IO.File.Exists(outputFilePath))
        {
            var quickActions = BuildFileQuickActions(outputFilePath);
            quickActions.Margin = new Thickness(2, 4, 0, 2);
            container.Children.Add(quickActions);
        }

        var actionBar = new StackPanel
        {
            Orientation = Orientation.Horizontal,
            HorizontalAlignment = HorizontalAlignment.Left,
            Margin = new Thickness(2, 2, 0, 0),
            Opacity = 0,
        };
        var btnColor = secondaryText;
        var capturedContent = content;

        actionBar.Children.Add(CreateActionButton("\uE8C8", "복사", btnColor, () =>
        {
            try { Clipboard.SetText(capturedContent); } catch { }
        }));
        actionBar.Children.Add(CreateActionButton("\uE72C", "다시 생성", btnColor, () => _ = RegenerateLastAsync()));
        actionBar.Children.Add(CreateActionButton("\uE70F", "수정 후 재시도", btnColor, () => ShowRetryWithFeedbackInput()));
        AddLinkedFeedbackButtons(actionBar, btnColor, message);

        var aiTimestamp = message?.Timestamp ?? DateTime.Now;
        actionBar.Children.Add(new TextBlock
        {
            Text = aiTimestamp.ToString("HH:mm"),
            FontSize = 10.5,
            Opacity = 0.52,
            Foreground = btnColor,
            VerticalAlignment = VerticalAlignment.Center,
            Margin = new Thickness(4, 0, 0, 1),
        });

        container.Children.Add(actionBar);
        var assistantMeta = CreateAssistantMessageMetaText(message);
        if (assistantMeta != null)
            container.Children.Add(assistantMeta);

        container.MouseEnter += (_, _) =>
        {
            actionBar.BeginAnimation(OpacityProperty,
                new DoubleAnimation(1, TimeSpan.FromMilliseconds(150)));
        };
        container.MouseLeave += (_, _) =>
        {
            var targetOpacity = ReferenceEquals(_selectedMessageActionBar, actionBar) ? 1.0 : 0.0;
            actionBar.BeginAnimation(OpacityProperty,
                new DoubleAnimation(targetOpacity, TimeSpan.FromMilliseconds(200)));
        };
        container.MouseLeftButtonUp += (_, _) => SelectMessageActionBar(actionBar, contentCard);

        var aiContent = content;
        container.MouseRightButtonUp += (_, re) =>
        {
            re.Handled = true;
            ShowMessageContextMenu(aiContent, "assistant");
        };

        if (message?.MsgId != null) _elementCache[$"m_{message.MsgId}"] = container;
        AddTranscriptElement(container);
    }

    /// <summary>
    /// 어시스턴트 메시지 텍스트에서 출력 파일 경로(절대 경로)를 추출합니다.
    /// "완료: C:\...\file.ext" 패턴을 우선 찾고, 없으면 일반 절대 경로를 검색합니다.
    /// </summary>
    private static string? ExtractOutputFilePathFromContent(string content)
    {
        if (string.IsNullOrWhiteSpace(content)) return null;

        // 패턴 1: "완료: C:\path\file.ext" 또는 "완료: E:\path\file.ext"
        var completionMatch = System.Text.RegularExpressions.Regex.Match(
            content,
            @"완료:\s*([A-Za-z]:\\[^\s\n""',;)]+\.(?:docx|xlsx|pptx|html|htm|pdf|csv|md|txt))");
        if (completionMatch.Success)
            return completionMatch.Groups[1].Value.TrimEnd('.');

        // 패턴 2: 임의의 절대 경로 (알려진 문서 확장자)
        var absMatch = System.Text.RegularExpressions.Regex.Match(
            content,
            @"([A-Za-z]:\\[^\s\n""',;)]+\.(?:docx|xlsx|pptx|html|htm|pdf|csv|md|txt))");
        if (absMatch.Success)
            return absMatch.Groups[1].Value.TrimEnd('.');

        return null;
    }
}