using System.IO;
using System.Text;
using System.Text.Json;
using System.Text.RegularExpressions;

namespace AxCopilot.Services.Agent;

/// <summary>
/// 여러 섹션의 내용을 하나의 완성된 문서로 조립하는 도구.
/// 멀티패스 문서 생성의 3단계: 개별 생성된 섹션들을 최종 문서로 결합합니다.
/// </summary>
public class DocumentAssemblerTool : IAgentTool
{
    private static string GetDefaultOutputFormat()
    {
        var app = System.Windows.Application.Current as App;
        return app?.SettingsService?.Settings.Llm.DefaultOutputFormat ?? "auto";
    }

    private static string GetDefaultMood()
    {
        var app = System.Windows.Application.Current as App;
        return app?.SettingsService?.Settings.Llm.DefaultMood ?? "modern";
    }

    public string Name => "document_assemble";
    public string Description =>
        "Assemble multiple individually-written sections into a single complete document. " +
        "Use this after writing each section separately with document_plan. " +
        "Supports HTML, DOCX, and Markdown output. " +
        "Automatically adds table of contents, cover page, and section numbering for HTML. " +
        "After assembly, the document is auto-validated for quality issues.";

    public ToolParameterSchema Parameters => new()
    {
        Properties = new()
        {
            ["path"] = new() { Type = "string", Description = "Output file path. Relative to work folder." },
            ["title"] = new() { Type = "string", Description = "Document title" },
            ["sections"] = new()
            {
                Type = "array",
                Description = "Array of section objects: [{\"heading\": \"1. 개요\", \"content\": \"HTML or markdown body...\", \"level\": 1}]. " +
                    "content should be the detailed text for each section.",
                Items = new() { Type = "object" }
            },
            ["format"] = new()
            {
                Type = "string",
                Description = "Output format: auto, html, docx, markdown. Default: auto (resolved from settings and request intent)",
                Enum = ["auto", "html", "docx", "markdown"]
            },
            ["mood"] = new()
            {
                Type = "string",
                Description = "Design theme for HTML output: modern, professional, creative, corporate, dashboard, etc. Default: inferred from settings and document intent"
            },
            ["toc"] = new() { Type = "boolean", Description = "Auto-generate table of contents. Default: true" },
            ["cover_subtitle"] = new() { Type = "string", Description = "Subtitle for cover page. If provided, a cover page is added." },
            ["template_path"] = new() { Type = "string", Description = "Optional .docx template path for DOCX output. Reuses template styles and section setup." },
            ["header"] = new() { Type = "string", Description = "Header text for DOCX output." },
            ["footer"] = new() { Type = "string", Description = "Footer text for DOCX output. Use {page} for page number." },
            ["page_numbers"] = new() { Type = "boolean", Description = "Show page numbers in DOCX footer. Default: true when header or footer is set." },
        },
        Required = ["path", "title", "sections"]
    };

    public async Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct)
    {
        var path = args.GetProperty("path").SafeGetString() ?? "";
        var title = args.GetProperty("title").SafeGetString() ?? "Document";
        var requestedFormat = args.SafeTryGetProperty("format", out var fmt) ? fmt.SafeGetString() ?? "auto" : GetDefaultOutputFormat();
        var requestedMood = args.SafeTryGetProperty("mood", out var m) ? m.SafeGetString() ?? GetDefaultMood() : GetDefaultMood();
        var useToc = !args.SafeTryGetProperty("toc", out var tocVal) || tocVal.GetBoolean(); // default true
        var coverSubtitle = args.SafeTryGetProperty("cover_subtitle", out var cs) ? cs.SafeGetString() : null;
        var templatePath = args.SafeTryGetProperty("template_path", out var templateEl) ? templateEl.SafeGetString() : null;
        var headerText = args.SafeTryGetProperty("header", out var hdr) ? hdr.SafeGetString() : null;
        var footerText = args.SafeTryGetProperty("footer", out var ftr) ? ftr.SafeGetString() : null;
        var showPageNumbers = args.SafeTryGetProperty("page_numbers", out var pageNumbersEl)
            ? pageNumbersEl.ValueKind == JsonValueKind.True
            : !string.IsNullOrWhiteSpace(headerText) || !string.IsNullOrWhiteSpace(footerText);

        if (!args.SafeTryGetProperty("sections", out var sectionsEl) || sectionsEl.ValueKind != JsonValueKind.Array)
            return ToolResult.Fail("sections 배열이 필요합니다.");

        var sections = new List<(string Heading, string Content, int Level)>();
        foreach (var sec in sectionsEl.EnumerateArray())
        {
            var heading = sec.SafeTryGetProperty("heading", out var h) ? h.SafeGetString() ?? "" : "";
            var content = sec.SafeTryGetProperty("content", out var c) ? c.SafeGetString() ?? "" : "";
            var level = sec.SafeTryGetProperty("level", out var lv) ? lv.GetInt32() : 1;
            if (!string.IsNullOrWhiteSpace(heading) || !string.IsNullOrWhiteSpace(content))
                sections.Add((heading, content, level));
        }

        if (sections.Count == 0)
            return ToolResult.Fail("조립할 섹션이 없습니다.");

        var format = ResolveDocumentFormat(requestedFormat, title, sections);
        var mood = ResolveDocumentMood(requestedMood, title, sections);

        var fullPath = FileReadTool.ResolvePath(path, context.WorkFolder);
        if (context.ActiveTab == "Cowork") fullPath = AgentContext.EnsureTimestampedPath(fullPath);

        // 확장자 자동 추가
        var ext = format switch
        {
            "docx" => ".docx",
            "markdown" => ".md",
            _ => ".html"
        };
        if (!fullPath.EndsWith(ext, StringComparison.OrdinalIgnoreCase))
            fullPath += ext;

        if (!context.IsPathAllowed(fullPath))
            return ToolResult.Fail($"경로 접근 차단: {fullPath}");
        if (!await context.CheckWritePermissionAsync(Name, fullPath))
            return ToolResult.Fail($"쓰기 권한 거부: {fullPath}");

        var dir = Path.GetDirectoryName(fullPath);
        if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);

        string? templateFullPath = null;
        if (!string.IsNullOrWhiteSpace(templatePath))
        {
            templateFullPath = FileReadTool.ResolvePath(templatePath, context.WorkFolder);
            if (!templateFullPath.EndsWith(".docx", StringComparison.OrdinalIgnoreCase))
                templateFullPath += ".docx";
            if (!context.IsPathAllowed(templateFullPath))
                return ToolResult.Fail($"템플릿 경로 접근 차단: {templateFullPath}");
            if (!File.Exists(templateFullPath))
                return ToolResult.Fail($"DOCX 템플릿을 찾을 수 없습니다: {templateFullPath}");
            if (string.Equals(Path.GetFullPath(templateFullPath), Path.GetFullPath(fullPath), StringComparison.OrdinalIgnoreCase))
                return ToolResult.Fail("template_path와 path는 같은 파일일 수 없습니다.");
        }

        try
        {
            string resultMsg;
            switch (format)
            {
                case "docx":
                    resultMsg = AssembleDocx(fullPath, title, sections, useToc, coverSubtitle, templateFullPath, headerText, footerText, showPageNumbers);
                    break;
                case "markdown":
                    resultMsg = AssembleMarkdown(fullPath, title, sections);
                    break;
                default:
                    resultMsg = AssembleHtml(fullPath, title, sections, mood, useToc, coverSubtitle);
                    break;
            }

            // 품질 요약 통계
            var totalChars = sections.Sum(s => s.Content.Length);
            var totalWords = sections.Sum(s => EstimateWordCount(s.Content));
            var pageEstimate = Math.Max(1, totalWords / 500);

            return ToolResult.Ok(
                $"✅ 문서 조립 완료: {fullPath}\n" +
                $"  섹션: {sections.Count}개 | 글자: {totalChars:N0} | 단어: ~{totalWords:N0} | 예상 페이지: ~{pageEstimate}\n" +
                $"{resultMsg}", fullPath);
        }
        catch (Exception ex)
        {
            return ToolResult.Fail($"문서 조립 실패: {ex.Message}");
        }
    }

    private string AssembleHtml(string path, string title, List<(string Heading, string Content, int Level)> sections,
        string mood, bool toc, string? coverSubtitle)
    {
        var sb = new StringBuilder();
        var style = TemplateService.GetCss(mood);
        var moodInfo = TemplateService.GetMood(mood);

        sb.AppendLine("<!DOCTYPE html>");
        sb.AppendLine("<html lang=\"ko\">");
        sb.AppendLine("<head>");
        sb.AppendLine("<meta charset=\"utf-8\">");
        sb.AppendLine($"<title>{Escape(title)}</title>");
        sb.AppendLine("<style>");
        sb.AppendLine(style);
        // 추가 조립용 스타일
        sb.AppendLine(@"
.assembled-doc { max-width: 900px; margin: 0 auto; padding: 40px 30px 60px; }
.assembled-doc h1 { font-size: 28px; margin-bottom: 8px; }
.assembled-doc h2 { font-size: 22px; margin-top: 36px; margin-bottom: 12px; border-bottom: 2px solid var(--accent, #4B5EFC); padding-bottom: 6px; }
.assembled-doc h3 { font-size: 18px; margin-top: 24px; margin-bottom: 8px; }
.assembled-doc .section-content { line-height: 1.8; margin-bottom: 20px; }
.assembled-doc .toc { background: #f8f9fa; border-radius: 12px; padding: 20px 28px; margin: 24px 0 32px; }
.assembled-doc .toc h3 { margin-top: 0; }
.assembled-doc .toc a { color: inherit; text-decoration: none; }
.assembled-doc .toc a:hover { text-decoration: underline; }
.assembled-doc .toc ul { list-style: none; padding-left: 0; }
.assembled-doc .toc li { padding: 4px 0; }
.cover-page { text-align: center; padding: 120px 40px 80px; page-break-after: always; }
.cover-page h1 { font-size: 36px; margin-bottom: 16px; }
.cover-page .subtitle { font-size: 18px; color: #666; margin-bottom: 40px; }
.cover-page .date { font-size: 14px; color: #999; }
@media print { .cover-page { page-break-after: always; } .assembled-doc h2 { page-break-before: auto; } }
");
        sb.AppendLine("</style>");
        sb.AppendLine("</head>");
        sb.AppendLine("<body>");

        // 커버 페이지
        if (!string.IsNullOrWhiteSpace(coverSubtitle))
        {
            sb.AppendLine("<div class=\"cover-page\">");
            sb.AppendLine($"<h1>{Escape(title)}</h1>");
            sb.AppendLine($"<div class=\"subtitle\">{Escape(coverSubtitle)}</div>");
            sb.AppendLine($"<div class=\"date\">{DateTime.Now:yyyy년 MM월 dd일}</div>");
            sb.AppendLine("</div>");
        }

        sb.AppendLine("<div class=\"assembled-doc\">");

        if (string.IsNullOrWhiteSpace(coverSubtitle))
            sb.AppendLine($"<h1>{Escape(title)}</h1>");

        // TOC 생성
        if (toc && sections.Count > 1)
        {
            sb.AppendLine("<div class=\"toc\">");
            sb.AppendLine("<h3>📋 목차</h3>");
            sb.AppendLine("<ul>");
            for (int i = 0; i < sections.Count; i++)
            {
                var indent = sections[i].Level > 1 ? " style=\"padding-left:20px\"" : "";
                sb.AppendLine($"<li{indent}><a href=\"#section-{i + 1}\">{Escape(sections[i].Heading)}</a></li>");
            }
            sb.AppendLine("</ul>");
            sb.AppendLine("</div>");
        }

        // 섹션 본문
        for (int i = 0; i < sections.Count; i++)
        {
            var (heading, content, level) = sections[i];
            var tag = level <= 1 ? "h2" : "h3";
            sb.AppendLine($"<{tag} id=\"section-{i + 1}\">{Escape(heading)}</{tag}>");
            // LLM이 생성한 깨진 태그 자동 수정
            var sanitized = HtmlSkill.SanitizeHtmlTagsPublic(content);
            sb.AppendLine($"<div class=\"section-content\">{sanitized}</div>");
        }

        sb.AppendLine("</div>");
        sb.AppendLine("</body>");
        sb.AppendLine("</html>");

        File.WriteAllText(path, sb.ToString(), Encoding.UTF8);

        var issues = ValidateBasic(sb.ToString());
        var review = ArtifactQualityReviewService.ReviewHtml(title, sb.ToString(), !string.IsNullOrWhiteSpace(coverSubtitle), toc, printReady: true);
        var reviewSummary = $"  HTML 품질 리뷰: {review.Score}/100 | 강점 {review.Strengths.Count} | 이슈 {review.Issues.Count}";
        return issues.Count > 0
            ? $"{reviewSummary} | 기본 검토 이슈 {issues.Count}건: {string.Join("; ", issues)}"
            : reviewSummary;
    }

    private string AssembleDocx(string path, string title, List<(string Heading, string Content, int Level)> sections,
        bool useToc, string? coverSubtitle, string? templatePath, string? headerText, string? footerText, bool showPageNumbers)
    {
        var templateApplied = !string.IsNullOrWhiteSpace(templatePath);
        if (templateApplied)
            File.Copy(templatePath!, path, true);

        using var doc = templateApplied
            ? DocumentFormat.OpenXml.Packaging.WordprocessingDocument.Open(path, true)
            : DocumentFormat.OpenXml.Packaging.WordprocessingDocument.Create(path, DocumentFormat.OpenXml.WordprocessingDocumentType.Document);

        var mainPart = doc.MainDocumentPart ?? doc.AddMainDocumentPart();

        EnsureAssemblerStyles(mainPart, templateApplied);

        var body = InitializeAssemblerBody(mainPart, templateApplied);

        DocumentFormat.OpenXml.Wordprocessing.RunFonts KoreanFonts() => new()
        {
            Ascii = "맑은 고딕",
            HighAnsi = "맑은 고딕",
            EastAsia = "맑은 고딕",
            ComplexScript = "맑은 고딕"
        };

        string DecodeHtml(string text)
            => text.Replace("&nbsp;", " ")
                   .Replace("&amp;", "&")
                   .Replace("&lt;", "<")
                   .Replace("&gt;", ">")
                   .Replace("&quot;", "\"");

        string ExtractStructuredText(string html)
        {
            if (string.IsNullOrWhiteSpace(html)) return "";

            var text = Regex.Replace(html, @"<br\s*/?>", "\n", RegexOptions.IgnoreCase);
            text = Regex.Replace(text, @"</(p|div|li|tr|h[1-6]|blockquote|table|thead|tbody|ul|ol)>", "\n", RegexOptions.IgnoreCase);
            text = Regex.Replace(text, @"<[^>]+>", " ");
            text = DecodeHtml(text);
            text = Regex.Replace(text, @"[ \t]+\n", "\n");
            text = Regex.Replace(text, @"\n{3,}", "\n\n");
            return text.Trim();
        }

        DocumentFormat.OpenXml.Wordprocessing.Paragraph CreateParagraph(
            string text,
            string fontSize = "22",
            bool bold = false,
            string? color = null,
            string? fill = null)
        {
            var para = new DocumentFormat.OpenXml.Wordprocessing.Paragraph();
            var props = new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties();
            props.SpacingBetweenLines = new DocumentFormat.OpenXml.Wordprocessing.SpacingBetweenLines
            {
                After = "160"
            };

            if (!string.IsNullOrWhiteSpace(fill))
            {
                props.ParagraphBorders = new DocumentFormat.OpenXml.Wordprocessing.ParagraphBorders(
                    new DocumentFormat.OpenXml.Wordprocessing.LeftBorder
                    {
                        Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single,
                        Size = 10,
                        Color = color ?? "2B579A"
                    });
                props.Shading = new DocumentFormat.OpenXml.Wordprocessing.Shading
                {
                    Val = DocumentFormat.OpenXml.Wordprocessing.ShadingPatternValues.Clear,
                    Fill = fill
                };
            }

            para.AppendChild(props);

            var run = new DocumentFormat.OpenXml.Wordprocessing.Run();
            var runProps = new DocumentFormat.OpenXml.Wordprocessing.RunProperties
            {
                RunFonts = KoreanFonts(),
                FontSize = new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = fontSize }
            };

            if (bold)
                runProps.Bold = new DocumentFormat.OpenXml.Wordprocessing.Bold();
            if (!string.IsNullOrWhiteSpace(color))
                runProps.Color = new DocumentFormat.OpenXml.Wordprocessing.Color { Val = color };

            run.AppendChild(runProps);
            run.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Text(text)
            {
                Space = DocumentFormat.OpenXml.SpaceProcessingModeValues.Preserve
            });
            para.AppendChild(run);
            return para;
        }

        DocumentFormat.OpenXml.Wordprocessing.Table CreateTableFromHtml(string tableHtml)
        {
            var table = new DocumentFormat.OpenXml.Wordprocessing.Table();
            table.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.TableProperties(
                new DocumentFormat.OpenXml.Wordprocessing.TableBorders(
                    new DocumentFormat.OpenXml.Wordprocessing.TopBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "CBD5E1" },
                    new DocumentFormat.OpenXml.Wordprocessing.BottomBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "CBD5E1" },
                    new DocumentFormat.OpenXml.Wordprocessing.LeftBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "CBD5E1" },
                    new DocumentFormat.OpenXml.Wordprocessing.RightBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "CBD5E1" },
                    new DocumentFormat.OpenXml.Wordprocessing.InsideHorizontalBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "E2E8F0" },
                    new DocumentFormat.OpenXml.Wordprocessing.InsideVerticalBorder { Val = DocumentFormat.OpenXml.Wordprocessing.BorderValues.Single, Size = 8, Color = "E2E8F0" })));

            var rowMatches = Regex.Matches(tableHtml, @"<tr\b[^>]*>(.*?)</tr>", RegexOptions.IgnoreCase | RegexOptions.Singleline);
            var rowIndex = 0;
            foreach (Match rowMatch in rowMatches)
            {
                var row = new DocumentFormat.OpenXml.Wordprocessing.TableRow();
                var rowHtml = rowMatch.Groups[1].Value;
                var isHeader = rowIndex == 0 || Regex.IsMatch(rowHtml, "<th", RegexOptions.IgnoreCase);
                var cellMatches = Regex.Matches(rowHtml, @"<t[hd]\b[^>]*>(.*?)</t[hd]>", RegexOptions.IgnoreCase | RegexOptions.Singleline);

                foreach (Match cellMatch in cellMatches)
                {
                    var cellText = ExtractStructuredText(cellMatch.Groups[1].Value);
                    var cell = new DocumentFormat.OpenXml.Wordprocessing.TableCell();
                    if (isHeader)
                    {
                        cell.AppendChild(CreateParagraph(cellText, fontSize: "21", bold: true, color: "1F3A5F", fill: "E8EEF8"));
                    }
                    else
                    {
                        cell.AppendChild(CreateParagraph(cellText));
                    }
                    cell.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.TableCellProperties(
                        new DocumentFormat.OpenXml.Wordprocessing.TableCellWidth
                        {
                            Type = DocumentFormat.OpenXml.Wordprocessing.TableWidthUnitValues.Auto
                        }));
                    row.AppendChild(cell);
                }

                if (cellMatches.Count > 0)
                    table.AppendChild(row);
                rowIndex++;
            }

            return table;
        }

        void AppendPlainText(string plain)
        {
            foreach (var rawLine in plain.Split('\n', StringSplitOptions.RemoveEmptyEntries))
            {
                var line = rawLine.Trim();
                if (string.IsNullOrWhiteSpace(line))
                    continue;

                if (Regex.IsMatch(line, @"^#{2,6}\s+"))
                {
                    body.AppendChild(CreateParagraph(Regex.Replace(line, @"^#{2,6}\s+", ""), fontSize: "26", bold: true, color: "2B579A"));
                    continue;
                }

                if (Regex.IsMatch(line, @"^[-*]\s+"))
                {
                    body.AppendChild(CreateParagraph($"• {Regex.Replace(line, @"^[-*]\s+", "")}"));
                    continue;
                }

                if (Regex.IsMatch(line, @"^\d+\.\s+"))
                {
                    body.AppendChild(CreateParagraph(line));
                    continue;
                }

                body.AppendChild(CreateParagraph(line));
            }
        }

        void AppendListBlock(string listHtml, bool ordered)
        {
            var matches = Regex.Matches(listHtml, @"<li\b[^>]*>(.*?)</li>", RegexOptions.IgnoreCase | RegexOptions.Singleline);
            var number = 1;
            foreach (Match match in matches)
            {
                var text = ExtractStructuredText(match.Groups[1].Value);
                var prefix = ordered ? $"{number}. " : "• ";
                body.AppendChild(CreateParagraph(prefix + text));
                number++;
            }
        }

        var includeCover = !string.IsNullOrWhiteSpace(coverSubtitle);
        if (includeCover)
            AppendAssemblerCoverPage(body, title, coverSubtitle!);
        else
            body.AppendChild(CreateParagraph(title, fontSize: "48", bold: true, color: "1F3A5F"));

        if (!includeCover)
            body.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Paragraph());

        if (useToc && sections.Count > 3)
            AppendAssemblerTableOfContents(body);

        var tableCount = 0;
        var listCount = 0;
        var calloutCount = 0;
        var highlightCount = 0;
        var headings = new List<string>();

        foreach (var (heading, content, level) in sections)
        {
            var headPara = new DocumentFormat.OpenXml.Wordprocessing.Paragraph();
            var headRun = new DocumentFormat.OpenXml.Wordprocessing.Run();
            headRun.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.RunProperties
            {
                RunFonts = KoreanFonts(),
                Bold = new DocumentFormat.OpenXml.Wordprocessing.Bold(),
                FontSize = new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = level <= 1 ? "32" : "28" },
                Color = new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "2B579A" },
            });
            headRun.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Text(heading));
            headPara.AppendChild(headRun);
            body.AppendChild(headPara);
            headings.Add(heading);

            AppendStructuredContent(content);
            body.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Paragraph());
        }

        body.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.SectionProperties(
            new DocumentFormat.OpenXml.Wordprocessing.PageSize { Width = 11906, Height = 16838 },
            new DocumentFormat.OpenXml.Wordprocessing.PageMargin { Top = 1440, Right = 1440, Bottom = 1440, Left = 1440,
                Header = 720, Footer = 720, Gutter = 0 }
        ));

        if (!string.IsNullOrWhiteSpace(headerText) || !string.IsNullOrWhiteSpace(footerText) || showPageNumbers)
            AddAssemblerHeaderFooter(mainPart, body, headerText, footerText, showPageNumbers);

        mainPart.Document.Save();

        var review = ArtifactQualityReviewService.ReviewStructuredDocument(new StructuredDocumentReviewInput(
            title,
            headings.Count,
            sections.Sum(section => StripHtmlTags(section.Content).Length),
            tableCount,
            listCount,
            calloutCount,
            highlightCount,
            0,
            includeCover,
            useToc && sections.Count > 3,
            templateApplied,
            !string.IsNullOrWhiteSpace(headerText) || !string.IsNullOrWhiteSpace(footerText),
            headings.Any(h => ArtifactQualityReviewService.ContainsBusinessKeyword(h, "executive summary", "summary", "요약")),
            headings.Any(h => ArtifactQualityReviewService.ContainsBusinessKeyword(h, "recommendation", "proposal", "next step", "action", "권고", "실행")),
            headings.Any(h => ArtifactQualityReviewService.ContainsBusinessKeyword(h, "appendix", "reference", "supplement", "부록", "참고"))));

        return $"  DOCX 품질 리뷰: {review.Score}/100 | 강점 {review.Strengths.Count} | 이슈 {review.Issues.Count}";

        void AppendStructuredContent(string rawContent)
        {
            if (string.IsNullOrWhiteSpace(rawContent))
                return;

            var normalized = rawContent.Replace("\r\n", "\n");
            if (!Regex.IsMatch(normalized, @"<\s*(p|ul|ol|table|blockquote|div|h[1-6]|li)\b", RegexOptions.IgnoreCase))
            {
                AppendPlainText(normalized);
                return;
            }

            normalized = Regex.Replace(normalized, @"<br\s*/?>", "\n", RegexOptions.IgnoreCase);
            var blockPattern = @"<table\b[^>]*>.*?</table>|<ul\b[^>]*>.*?</ul>|<ol\b[^>]*>.*?</ol>|<blockquote\b[^>]*>.*?</blockquote>|<div\b[^>]*class=""[^""]*(callout-[^""]*|comparison-grid|roadmap-block|matrix-grid|highlight-box)[^""]*""[^>]*>.*?</div>|<h[2-6]\b[^>]*>.*?</h[2-6]>|<p\b[^>]*>.*?</p>";
            var matches = Regex.Matches(normalized, blockPattern, RegexOptions.IgnoreCase | RegexOptions.Singleline);

            if (matches.Count == 0)
            {
                AppendPlainText(ExtractStructuredText(normalized));
                return;
            }

            var cursor = 0;
            foreach (Match match in matches)
            {
                if (match.Index > cursor)
                {
                    var leadingText = ExtractStructuredText(normalized.Substring(cursor, match.Index - cursor));
                    AppendPlainText(leadingText);
                }

                var block = match.Value;
                if (Regex.IsMatch(block, @"^<table", RegexOptions.IgnoreCase))
                {
                    body.AppendChild(CreateTableFromHtml(block));
                    tableCount++;
                }
                else if (Regex.IsMatch(block, @"^<ul", RegexOptions.IgnoreCase))
                {
                    AppendListBlock(block, ordered: false);
                    listCount++;
                }
                else if (Regex.IsMatch(block, @"^<ol", RegexOptions.IgnoreCase))
                {
                    AppendListBlock(block, ordered: true);
                    listCount++;
                }
                else if (Regex.IsMatch(block, @"^<h", RegexOptions.IgnoreCase))
                {
                    body.AppendChild(CreateParagraph(ExtractStructuredText(block), fontSize: "26", bold: true, color: "2B579A"));
                }
                else if (Regex.IsMatch(block, @"^<(blockquote|div)", RegexOptions.IgnoreCase))
                {
                    var fill = Regex.IsMatch(block, "highlight-box", RegexOptions.IgnoreCase) ? "FFF7DA" : "EDF4FF";
                    body.AppendChild(CreateParagraph(ExtractStructuredText(block), fontSize: "21", bold: true, color: "1F3A5F", fill: fill));
                    if (Regex.IsMatch(block, "highlight-box", RegexOptions.IgnoreCase))
                        highlightCount++;
                    else
                        calloutCount++;
                }
                else
                {
                    AppendPlainText(ExtractStructuredText(block));
                }

                cursor = match.Index + match.Length;
            }

            if (cursor < normalized.Length)
                AppendPlainText(ExtractStructuredText(normalized[cursor..]));
        }
    }

    /// <summary>DOCX 기본 스타일 정의 생성 (한글 글꼴 기본 설정 포함).</summary>
    private static DocumentFormat.OpenXml.Wordprocessing.Styles CreateDefaultDocxStyles()
    {
        var styles = new DocumentFormat.OpenXml.Wordprocessing.Styles();

        // 문서 기본 글꼴 설정
        var docDefaults = new DocumentFormat.OpenXml.Wordprocessing.DocDefaults(
            new DocumentFormat.OpenXml.Wordprocessing.RunPropertiesDefault(
                new DocumentFormat.OpenXml.Wordprocessing.RunPropertiesBaseStyle(
                    new DocumentFormat.OpenXml.Wordprocessing.RunFonts
                    {
                        Ascii = "맑은 고딕",
                        HighAnsi = "맑은 고딕",
                        EastAsia = "맑은 고딕",
                        ComplexScript = "맑은 고딕"
                    },
                    new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "22" },
                    new DocumentFormat.OpenXml.Wordprocessing.Languages { Val = "ko-KR", EastAsia = "ko-KR" }
                )
            ),
            new DocumentFormat.OpenXml.Wordprocessing.ParagraphPropertiesDefault(
                new DocumentFormat.OpenXml.Wordprocessing.ParagraphPropertiesBaseStyle(
                    new DocumentFormat.OpenXml.Wordprocessing.SpacingBetweenLines { After = "160", Line = "259", LineRule = DocumentFormat.OpenXml.Wordprocessing.LineSpacingRuleValues.Auto }
                )
            )
        );
        styles.AppendChild(docDefaults);

        // Normal 스타일
        var normalStyle = new DocumentFormat.OpenXml.Wordprocessing.Style
        {
            Type = DocumentFormat.OpenXml.Wordprocessing.StyleValues.Paragraph,
            StyleId = "Normal",
            Default = true
        };
        normalStyle.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.StyleName { Val = "Normal" });
        styles.AppendChild(normalStyle);

        return styles;
    }

    private static DocumentFormat.OpenXml.Wordprocessing.Body InitializeAssemblerBody(
        DocumentFormat.OpenXml.Packaging.MainDocumentPart mainPart,
        bool preserveSectionSetup)
    {
        mainPart.Document ??= new DocumentFormat.OpenXml.Wordprocessing.Document();

        DocumentFormat.OpenXml.Wordprocessing.SectionProperties? preservedSection = null;
        if (preserveSectionSetup)
            preservedSection = mainPart.Document.Body?.Elements<DocumentFormat.OpenXml.Wordprocessing.SectionProperties>().LastOrDefault()?.CloneNode(true) as DocumentFormat.OpenXml.Wordprocessing.SectionProperties;

        mainPart.Document.Body = new DocumentFormat.OpenXml.Wordprocessing.Body();
        var body = mainPart.Document.Body;

        if (preservedSection != null)
            body.Append(preservedSection);

        return body;
    }

    private static void EnsureAssemblerStyles(
        DocumentFormat.OpenXml.Packaging.MainDocumentPart mainPart,
        bool preserveExisting)
    {
        var stylesPart = mainPart.StyleDefinitionsPart;
        if (stylesPart == null)
        {
            stylesPart = mainPart.AddNewPart<DocumentFormat.OpenXml.Packaging.StyleDefinitionsPart>();
            stylesPart.Styles = CreateDefaultDocxStyles();
            stylesPart.Styles.Save();
            return;
        }

        if (!preserveExisting || stylesPart.Styles == null)
        {
            stylesPart.Styles = CreateDefaultDocxStyles();
            stylesPart.Styles.Save();
        }
    }

    private static void AppendAssemblerCoverPage(DocumentFormat.OpenXml.Wordprocessing.Body body, string title, string subtitle)
    {
        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties
            {
                Justification = new DocumentFormat.OpenXml.Wordprocessing.Justification
                {
                    Val = DocumentFormat.OpenXml.Wordprocessing.JustificationValues.Center
                },
                SpacingBetweenLines = new DocumentFormat.OpenXml.Wordprocessing.SpacingBetweenLines
                {
                    Before = "1600",
                    After = "120"
                }
            },
            new DocumentFormat.OpenXml.Wordprocessing.Run(
                new DocumentFormat.OpenXml.Wordprocessing.RunProperties(
                    new DocumentFormat.OpenXml.Wordprocessing.Bold(),
                    new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "44" },
                    new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "1F3A5F" },
                    new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }),
                new DocumentFormat.OpenXml.Wordprocessing.Text(title))));

        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties
            {
                Justification = new DocumentFormat.OpenXml.Wordprocessing.Justification
                {
                    Val = DocumentFormat.OpenXml.Wordprocessing.JustificationValues.Center
                },
                SpacingBetweenLines = new DocumentFormat.OpenXml.Wordprocessing.SpacingBetweenLines
                {
                    After = "260"
                }
            },
            new DocumentFormat.OpenXml.Wordprocessing.Run(
                new DocumentFormat.OpenXml.Wordprocessing.RunProperties(
                    new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "26" },
                    new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "5B6472" },
                    new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }),
                new DocumentFormat.OpenXml.Wordprocessing.Text(subtitle))));

        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties
            {
                Justification = new DocumentFormat.OpenXml.Wordprocessing.Justification
                {
                    Val = DocumentFormat.OpenXml.Wordprocessing.JustificationValues.Center
                }
            },
            new DocumentFormat.OpenXml.Wordprocessing.Run(
                new DocumentFormat.OpenXml.Wordprocessing.RunProperties(
                    new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "18" },
                    new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "808080" },
                    new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }),
                new DocumentFormat.OpenXml.Wordprocessing.Text(DateTime.Now.ToString("yyyy-MM-dd")))));

        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.Break
            {
                Type = DocumentFormat.OpenXml.Wordprocessing.BreakValues.Page
            })));
    }

    private static void AppendAssemblerTableOfContents(DocumentFormat.OpenXml.Wordprocessing.Body body)
    {
        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties(
                new DocumentFormat.OpenXml.Wordprocessing.SpacingBetweenLines { Before = "120", After = "120" }),
            new DocumentFormat.OpenXml.Wordprocessing.Run(
                new DocumentFormat.OpenXml.Wordprocessing.RunProperties(
                    new DocumentFormat.OpenXml.Wordprocessing.Bold(),
                    new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "28" },
                    new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }),
                new DocumentFormat.OpenXml.Wordprocessing.Text("목차"))));

        var paragraph = new DocumentFormat.OpenXml.Wordprocessing.Paragraph();
        paragraph.Append(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.FieldChar
        {
            FieldCharType = DocumentFormat.OpenXml.Wordprocessing.FieldCharValues.Begin
        }));
        paragraph.Append(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.FieldCode(" TOC \\o \"1-3\" \\h \\z \\u ")
        {
            Space = DocumentFormat.OpenXml.SpaceProcessingModeValues.Preserve
        }));
        paragraph.Append(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.FieldChar
        {
            FieldCharType = DocumentFormat.OpenXml.Wordprocessing.FieldCharValues.Separate
        }));
        paragraph.Append(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.Text("Word에서 필드 업데이트를 실행하면 목차가 새로 고쳐집니다.")));
        paragraph.Append(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.FieldChar
        {
            FieldCharType = DocumentFormat.OpenXml.Wordprocessing.FieldCharValues.End
        }));
        body.Append(paragraph);
        body.Append(new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
            new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.Break
            {
                Type = DocumentFormat.OpenXml.Wordprocessing.BreakValues.Page
            })));
    }

    private static void AddAssemblerHeaderFooter(
        DocumentFormat.OpenXml.Packaging.MainDocumentPart mainPart,
        DocumentFormat.OpenXml.Wordprocessing.Body body,
        string? headerText,
        string? footerText,
        bool showPageNumbers)
    {
        if (!string.IsNullOrWhiteSpace(headerText))
        {
            var headerPart = mainPart.AddNewPart<DocumentFormat.OpenXml.Packaging.HeaderPart>();
            var header = new DocumentFormat.OpenXml.Wordprocessing.Header();
            var paragraph = new DocumentFormat.OpenXml.Wordprocessing.Paragraph(
                new DocumentFormat.OpenXml.Wordprocessing.Run(
                    new DocumentFormat.OpenXml.Wordprocessing.RunProperties(
                        new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "18" },
                        new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "808080" },
                        new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }),
                    new DocumentFormat.OpenXml.Wordprocessing.Text(headerText)));
            paragraph.ParagraphProperties = new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties
            {
                Justification = new DocumentFormat.OpenXml.Wordprocessing.Justification
                {
                    Val = DocumentFormat.OpenXml.Wordprocessing.JustificationValues.Right
                }
            };
            header.Append(paragraph);
            headerPart.Header = header;

            var sectionProperties = body.Elements<DocumentFormat.OpenXml.Wordprocessing.SectionProperties>().LastOrDefault()
                ?? body.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.SectionProperties());
            sectionProperties.Elements<DocumentFormat.OpenXml.Wordprocessing.HeaderReference>().ToList().ForEach(reference => reference.Remove());
            sectionProperties.Append(new DocumentFormat.OpenXml.Wordprocessing.HeaderReference
            {
                Type = DocumentFormat.OpenXml.Wordprocessing.HeaderFooterValues.Default,
                Id = mainPart.GetIdOfPart(headerPart)
            });
        }

        if (!string.IsNullOrWhiteSpace(footerText) || showPageNumbers)
        {
            var footerPart = mainPart.AddNewPart<DocumentFormat.OpenXml.Packaging.FooterPart>();
            var footer = new DocumentFormat.OpenXml.Wordprocessing.Footer();
            var paragraph = new DocumentFormat.OpenXml.Wordprocessing.Paragraph
            {
                ParagraphProperties = new DocumentFormat.OpenXml.Wordprocessing.ParagraphProperties
                {
                    Justification = new DocumentFormat.OpenXml.Wordprocessing.Justification
                    {
                        Val = DocumentFormat.OpenXml.Wordprocessing.JustificationValues.Center
                    }
                }
            };

            var displayText = string.IsNullOrWhiteSpace(footerText) ? "AX Copilot" : footerText!;
            if (showPageNumbers)
            {
                if (displayText.Contains("{page}", StringComparison.Ordinal))
                {
                    var parts = displayText.Split("{page}", StringSplitOptions.None);
                    paragraph.Append(CreateAssemblerFooterRun(parts[0]));
                    paragraph.Append(CreateAssemblerPageNumberRun());
                    if (parts.Length > 1)
                        paragraph.Append(CreateAssemblerFooterRun(parts[1]));
                }
                else
                {
                    paragraph.Append(CreateAssemblerFooterRun(displayText + " · "));
                    paragraph.Append(CreateAssemblerPageNumberRun());
                }
            }
            else
            {
                paragraph.Append(CreateAssemblerFooterRun(displayText));
            }

            footer.Append(paragraph);
            footerPart.Footer = footer;

            var sectionProperties = body.Elements<DocumentFormat.OpenXml.Wordprocessing.SectionProperties>().LastOrDefault()
                ?? body.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.SectionProperties());
            sectionProperties.Elements<DocumentFormat.OpenXml.Wordprocessing.FooterReference>().ToList().ForEach(reference => reference.Remove());
            sectionProperties.Append(new DocumentFormat.OpenXml.Wordprocessing.FooterReference
            {
                Type = DocumentFormat.OpenXml.Wordprocessing.HeaderFooterValues.Default,
                Id = mainPart.GetIdOfPart(footerPart)
            });
        }
    }

    private static DocumentFormat.OpenXml.Wordprocessing.Run CreateAssemblerFooterRun(string text) =>
        new(new DocumentFormat.OpenXml.Wordprocessing.Text(text) { Space = DocumentFormat.OpenXml.SpaceProcessingModeValues.Preserve })
        {
            RunProperties = new DocumentFormat.OpenXml.Wordprocessing.RunProperties
            {
                FontSize = new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "16" },
                Color = new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "999999" },
                RunFonts = new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }
            }
        };

    private static DocumentFormat.OpenXml.Wordprocessing.Run CreateAssemblerPageNumberRun()
    {
        var run = new DocumentFormat.OpenXml.Wordprocessing.Run
        {
            RunProperties = new DocumentFormat.OpenXml.Wordprocessing.RunProperties
            {
                FontSize = new DocumentFormat.OpenXml.Wordprocessing.FontSize { Val = "16" },
                Color = new DocumentFormat.OpenXml.Wordprocessing.Color { Val = "999999" },
                RunFonts = new DocumentFormat.OpenXml.Wordprocessing.RunFonts { Ascii = "맑은 고딕", HighAnsi = "맑은 고딕", EastAsia = "맑은 고딕" }
            }
        };

        run.Append(new DocumentFormat.OpenXml.Wordprocessing.FieldChar
        {
            FieldCharType = DocumentFormat.OpenXml.Wordprocessing.FieldCharValues.Begin
        });
        run.Append(new DocumentFormat.OpenXml.Wordprocessing.FieldCode(" PAGE ")
        {
            Space = DocumentFormat.OpenXml.SpaceProcessingModeValues.Preserve
        });
        run.Append(new DocumentFormat.OpenXml.Wordprocessing.FieldChar
        {
            FieldCharType = DocumentFormat.OpenXml.Wordprocessing.FieldCharValues.End
        });
        return run;
    }

    private string AssembleMarkdown(string path, string title, List<(string Heading, string Content, int Level)> sections)
    {
        var sb = new StringBuilder();
        sb.AppendLine($"# {title}");
        sb.AppendLine();
        sb.AppendLine($"*작성일: {DateTime.Now:yyyy-MM-dd}*");
        sb.AppendLine();

        // TOC
        if (sections.Count > 1)
        {
            sb.AppendLine("## 목차");
            sb.AppendLine();
            foreach (var (heading, _, _) in sections)
            {
                var anchor = heading.Replace(" ", "-").ToLowerInvariant();
                sb.AppendLine($"- [{heading}](#{anchor})");
            }
            sb.AppendLine();
            sb.AppendLine("---");
            sb.AppendLine();
        }

        foreach (var (heading, content, level) in sections)
        {
            var prefix = level <= 1 ? "##" : "###";
            sb.AppendLine($"{prefix} {heading}");
            sb.AppendLine();
            sb.AppendLine(StripHtmlTags(content));
            sb.AppendLine();
        }

        File.WriteAllText(path, sb.ToString(), Encoding.UTF8);
        return "  ✓ Markdown 조립 완료";
    }

    private static string ResolveDocumentFormat(string? preferred, string title, List<(string Heading, string Content, int Level)> sections)
    {
        var normalized = (preferred ?? "auto").Trim().ToLowerInvariant();
        if (normalized is "html" or "docx" or "markdown")
            return normalized;

        var intent = BuildIntentText(title, sections);
        if (ContainsAny(intent, "docx", "word", "워드"))
            return "docx";
        if (ContainsAny(intent, "markdown", ".md", "마크다운", "readme", "가이드", "매뉴얼", "회의록"))
            return "markdown";
        if (ContainsAny(intent, "html", "웹 문서", "웹페이지", "대시보드"))
            return "html";
        if (ContainsAny(intent, "proposal", "제안", "제안서", "보고"))
            return "docx";
        if (ContainsAny(intent, "analysis", "분석", "지표", "통계"))
            return "html";

        return "docx";
    }

    private static string ResolveDocumentMood(string? preferred, string title, List<(string Heading, string Content, int Level)> sections)
    {
        var normalized = (preferred ?? "modern").Trim().ToLowerInvariant();
        if (!string.IsNullOrWhiteSpace(normalized) && normalized != "modern")
            return normalized;

        var intent = BuildIntentText(title, sections);
        if (ContainsAny(intent, "dashboard", "분석", "지표", "통계", "kpi"))
            return "dashboard";
        if (ContainsAny(intent, "기획", "아이디어", "브레인스토밍", "creative"))
            return "creative";
        if (ContainsAny(intent, "기업", "공식", "proposal", "제안서", "사내"))
            return "corporate";
        if (ContainsAny(intent, "가이드", "매뉴얼", "manual", "guide"))
            return "minimal";
        if (ContainsAny(intent, "회의록", "minutes"))
            return "professional";

        return "professional";
    }

    private static string BuildIntentText(string title, List<(string Heading, string Content, int Level)> sections)
    {
        var headingText = string.Join(" ", sections.Select(s => s.Heading));
        return $"{title} {headingText}".ToLowerInvariant();
    }

    private static bool ContainsAny(string text, params string[] keywords)
        => keywords.Any(k => text.Contains(k, StringComparison.OrdinalIgnoreCase));

    private static int EstimateWordCount(string text)
    {
        if (string.IsNullOrWhiteSpace(text)) return 0;
        var plain = StripHtmlTags(text);
        // 한국어: 글자 수 / 3 ≈ 단어 수, 영어: 공백 분리
        var spaces = plain.Count(c => c == ' ');
        var koreanChars = plain.Count(c => c >= 0xAC00 && c <= 0xD7A3);
        return spaces + 1 + koreanChars / 3;
    }

    private static string StripHtmlTags(string html)
    {
        if (string.IsNullOrEmpty(html)) return "";
        return System.Text.RegularExpressions.Regex.Replace(html, "<[^>]+>", " ")
            .Replace("&nbsp;", " ")
            .Replace("&amp;", "&")
            .Replace("&lt;", "<")
            .Replace("&gt;", ">")
            .Replace("  ", " ")
            .Trim();
    }

    private static List<string> ValidateBasic(string html)
    {
        var issues = new List<string>();
        if (html.Length < 500)
            issues.Add("문서 내용이 매우 짧습니다 (500자 미만)");

        // 빈 섹션 검사
        var emptySectionPattern = new System.Text.RegularExpressions.Regex(
            @"<h[23][^>]*>[^<]+</h[23]>\s*<div class=""section-content"">\s*</div>",
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        var emptyMatches = emptySectionPattern.Matches(html);
        if (emptyMatches.Count > 0)
            issues.Add($"빈 섹션 {emptyMatches.Count}개 발견");

        // 플레이스홀더 검사
        if (html.Contains("[TODO]", StringComparison.OrdinalIgnoreCase) ||
            html.Contains("[PLACEHOLDER]", StringComparison.OrdinalIgnoreCase) ||
            html.Contains("Lorem ipsum", StringComparison.OrdinalIgnoreCase))
            issues.Add("플레이스홀더 텍스트가 남아있습니다");

        return issues;
    }

    private static string Escape(string text)
    {
        return text.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;");
    }
}