using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;

MemoryStream CreateTableOfContents(Stream stream, TabLeaderType tabLeaderType, bool includePageNumbers,
    TOCInsertMode insertMode, int startLevel, int endLevel, bool useHyperlinks, DocumentFormat targetFormat) {
    using var wordProcessor = new RichEditDocumentServer();
    wordProcessor.LoadDocument(stream);

    List<string> switches = new();

    // Hyperlinks switch
    if (useHyperlinks)
        switches.Add("\\h");

    // Levels (only if not TC fields selection and valid range)
    if (insertMode != TOCInsertMode.TCFields)
            switches.Add($"\\o \"{startLevel}-{endLevel}\"");

    // Show / hide page numbers (if IncludePageNumbers false add \n to hide)
    if (!includePageNumbers)
        switches.Add($"\\n \"{startLevel}-{endLevel}\"");
    // OutlineLevels vs ParagraphStyles vs TC fields
    switch (insertMode) {
        case TOCInsertMode.OutlineLevels:
            switches.Add("\\u"); // use outline levels
            break;
        case TOCInsertMode.TCFields:
            // Use identifier for TC fields (choose static id) \f id
            switches.Add($"\\f chapters");
            switches.Add($"\\l \"{startLevel}-{endLevel}\"");
            break;
    }
    string fieldCode = "TOC" + (switches.Count > 0 ? (" " + string.Join(" ", switches)) : string.Empty) + " ";

    var document = wordProcessor.Document;
    var tocParagraphRange = document.Bookmarks["toc_bookmark"].Range;
    Field tocField = document.Fields.Create(tocParagraphRange.Start, fieldCode);
    tocField.Update();
    document.UpdateAllFields();

    var output = new MemoryStream();
    wordProcessor.SaveDocument(output, targetFormat);
    output.Position = 0;
    return output;
}