using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Fonts;
using PdfSharp.Pdf;

namespace Logof_Client;

public class PdfBuilder
{
    private readonly PdfExportSettings _settings;
    private readonly XFont _boldFont;
    private readonly XFont _regularFont;
    private readonly XFont _smallFont;

    public PdfBuilder(PdfExportSettings? settings = null)
    {
        try
        {
            EnsureFontResolverRegistered();
            _settings = settings ?? new PdfExportSettings();

            // Select first font from build output fonts folder (AppContext.BaseDirectory/fonts)
            var chosenFamily = "Arial";
            try
            {
                if (Directory.Exists(Global._instance.font_path))
                {
                    var first = Directory.EnumerateFiles(Global._instance.font_path, "*.ttf").FirstOrDefault();
                    if (!string.IsNullOrEmpty(first))
                        chosenFamily = StripStyleSuffix(Path.GetFileNameWithoutExtension(first)) ?? chosenFamily;
                }
            }
            catch (Exception ex)
            {
                Logger.Log($"Error while searching for fonts: {ex.Message}",Logger.LogType.Error);
                chosenFamily = "Arial";
            }

            _boldFont = new XFont(chosenFamily, _settings.fontSize, XFontStyleEx.Bold);
            _regularFont = new XFont(chosenFamily, _settings.fontSize, XFontStyleEx.Regular);
            _smallFont = new XFont(chosenFamily, _settings.smallFontSize, XFontStyleEx.Regular);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while font resolving: {ex.Message}",Logger.LogType.Error);
        }
        

    }

    private static void EnsureFontResolverRegistered()
    {
        try
        {
            if (GlobalFontSettings.FontResolver != null) return;
            //var fontsDir = Path.Combine(AppContext.BaseDirectory, "fonts");
            GlobalFontSettings.FontResolver = new StableFontResolver(Global._instance.font_path);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while ensuring font resolver register state: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private static string StripStyleSuffix(string name)
    {
        try
        {
            if (string.IsNullOrEmpty(name)) return name;
            var idx = name.IndexOf('-');
            if (idx < 0) idx = name.IndexOf('_');
            if (idx > 0)
                return name.Substring(0, idx);
            return name;
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while stripping style suffix: {ex.Message}",Logger.LogType.Error);
        }

        return null;

    }


    /// <summary>
    ///     Creates a PDF document with address stickers from an AddressSet with a placeholder in the first cell.
    /// </summary>
    /// <param name="addressSetId">The ID of the AddressSet to use</param>
    /// <param name="placeholderText">Text for the first cell (top-left)</param>
    /// <param name="outputPath">Path where the PDF should be saved</param>
    public void CreateAddressLabelPdfFromAddressSetWithPlaceholder(int addressSetId, string placeholderText,
        string outputPath)
    {
        try
        {
            // Find the AddressSet by ID
            var addressSet = Settings._instance.addressSets.GetAddressSetByID(addressSetId);
            if (addressSet == null)
                throw new ArgumentException($"AddressSet with ID {addressSetId} not found");

            if (addressSet.KasPersons == null || addressSet.KasPersons.Count == 0)
                throw new ArgumentException($"AddressSet with ID {addressSetId} contains no addresses");

            // Generate markdown addresses from all KasPersons in the set
            //var addresses = new string?[addressSet.KasPersons.Count];
            var addresses = new List<string>();

            // find customer (owner) to include sender_address
            string senderLine = null;
            try
            {
                var owner = Settings._instance.customers.customers.FirstOrDefault(c => c.ID == addressSet.owner_id);
                if (owner != null && !string.IsNullOrWhiteSpace(owner.sender_address))
                    senderLine = "<font6>" + owner.sender_address.Replace("\n", " ").Trim() + "</font6>\n";
            }
            catch
            {
                senderLine = null;
            }

            for (var i = 0; i < addressSet.KasPersons.Count; i++)
            {
                var addr = AddressCreator.CreateFinalMarkdownString(addressSet.KasPersons[i].id);
                if (string.IsNullOrWhiteSpace(addr)) continue;
                if (!string.IsNullOrEmpty(senderLine))
                    addresses.Add(senderLine + (addr ?? ""));
                else
                    addresses.Add(addr);
            }

        if (addresses.Count == 0)
        {
            MessageBox.Show(MainWindow._instance, "Keine validen Adressen konnten generiert werden. Abbruch.", "Fehler");
            return;
        }
        CreateAddressLabelPdfWithPlaceholder(addresses, placeholderText, outputPath);

        if (_settings.exportRunningSheets)
        {
            ExportRunningSheets(addressSetId, outputPath);
        }
            CreateAddressLabelPdfWithPlaceholder(addresses, placeholderText, outputPath);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while creating address label pdf from address set with placeholder: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    /// <summary>
    ///     Creates a PDF document with a single placeholder cell for other information.
    /// </summary>
    /// <param name="addresses">Array of addresses</param>
    /// <param name="placeholderText">Text for the first cell (top-left)</param>
    /// <param name="outputPath">Path where the PDF should be saved</param>
    public void CreateAddressLabelPdfWithPlaceholder(List<string> addresses, string placeholderText, string outputPath)
    {
        try
        {
                if (addresses == null || addresses.Count == 0)
                    throw new ArgumentException("Addresses array cannot be null or empty");

                var document = new PdfDocument();

                var addressIndex = 0;
                var isFirstCell = true;

                while (addressIndex < addresses.Count || isFirstCell)
                {
                    var page = document.AddPage();
                    page.Size = PageSize.A4;

                    using (var gfx = XGraphics.FromPdfPage(page))
                    {
                        DrawPageWithPlaceholder(gfx, addresses, ref addressIndex, ref isFirstCell, placeholderText);
                    }
                }

                document.Save(outputPath);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while creating address label pdf with placeholder: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private void DrawPage(XGraphics gfx, List<string> addresses, ref int addressIndex)
    {
        for (var row = 0; row < _settings.rowsPerPage; row++)
        {
            for (var col = 0; col < _settings.columnsPerPage; col++)
            {
                if (addressIndex >= addresses.Count) break;

                var x = MmToPoints(_settings.pageMarginLeftMm + col * GetCellWidthMm());
                var y = MmToPoints(_settings.pageMarginTopMm + row * GetCellHeightMm());

                DrawCell(gfx, x, y, addresses[addressIndex]);
                addressIndex++;
            }

            if (addressIndex >= addresses.Count) break;
        }
    }

    private void DrawPageWithPlaceholder(XGraphics gfx, List<string> addresses, ref int addressIndex,
        ref bool isFirstCell, string placeholderText)
    {
        try
        {
            for (var row = 0; row < _settings.rowsPerPage; row++)
            for (var col = 0; col < _settings.columnsPerPage; col++)
            {
                var x = MmToPoints(_settings.pageMarginLeftMm + col * GetCellWidthMm());
                var y = MmToPoints(_settings.pageMarginTopMm + row * GetCellHeightMm());

                // First cell: placeholder
                if (isFirstCell)
                {
                    DrawCell(gfx, x, y, placeholderText);
                    isFirstCell = false;
                }
                else if (addressIndex < addresses.Count)
                {
                    DrawCell(gfx, x, y, addresses[addressIndex]);
                    addressIndex++;
                }
                else
                {
                    DrawEmptyCell(gfx, x, y);
                }
            }
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while drawing page with placholder: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private void DrawCell(XGraphics gfx, double x, double y, string? address)
    {
        try
        {
            var cellWidthPoints = MmToPoints(GetCellWidthMm());
            var cellHeightPoints = MmToPoints(GetCellHeightMm());

            // Draw cell border
            var rect = new XRect(x, y, cellWidthPoints, cellHeightPoints);
            gfx.DrawRectangle(XPens.Black, rect);

            // Draw address content if available
            if (!string.IsNullOrEmpty(address)) DrawMarkdownText(gfx, address, x, y, cellWidthPoints, cellHeightPoints);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while drawing cell: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private void DrawEmptyCell(XGraphics gfx, double x, double y)
    {
        try
        {
            var cellWidthPoints = MmToPoints(GetCellWidthMm());
            var cellHeightPoints = MmToPoints(GetCellHeightMm());

            var rect = new XRect(x, y, cellWidthPoints, cellHeightPoints);
            gfx.DrawRectangle(XPens.Black, rect);
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while drawing empty cell: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private void DrawMarkdownText(XGraphics gfx, string text, double x, double y, double cellWidth, double cellHeight)
    {
        try
        {
            var paddingLeftPoints = MmToPoints(_settings.cellPaddingLeftMm);
            var paddingRightPoints = MmToPoints(_settings.cellPaddingRightMm);
            var paddingTopPoints = MmToPoints(_settings.cellPaddingTopMm);
            var paddingBottomPoints = MmToPoints(_settings.cellPaddingBottomMm);

            var maxWidth = Math.Max(0, cellWidth - paddingLeftPoints - paddingRightPoints);

            // Split text by newlines and remove empty trailing lines
            var rawLines = text.Split(new[] { "\n" }, StringSplitOptions.None);
            var lines = rawLines.Where(l => l != null).ToArray();

            // Use a conservative line height in points
            var lineHeight = _regularFont.Size * 1.2;

            // Calculate total height of the text block
            var totalHeight = lines.Length * lineHeight;

            // Start drawing from the top of the cell (align addresses to top)
            var startY = y + paddingTopPoints;

            var currentY = startY;

            foreach (var line in lines)
            {
                // Stop if we've reached the top boundary
                if (currentY + lineHeight > y + cellHeight - paddingBottomPoints + 0.001)
                    break;

                // Parse and draw the line with markdown support
                DrawLineWithMarkdown(gfx, line, x + paddingLeftPoints, currentY, maxWidth);
                currentY += lineHeight;
            }
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while drawing markdown text: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private void DrawLineWithMarkdown(XGraphics gfx, string line, double x, double y, double maxWidth)
    {
        try
        {
            if (string.IsNullOrWhiteSpace(line)) return;
            var currentX = x;
            var i = 0;

            while (i < line.Length)
            {
                if (currentX - x >= maxWidth)
                    break;

                var remainingWidth = maxWidth - (currentX - x);

                // Check for small-font tag <font6> ... </font6>
                if (i <= line.Length - 7 && line.Substring(i, 7) == "<font6>")
                {
                    var endTag = line.IndexOf("</font6>", i + 7, StringComparison.Ordinal);
                    if (endTag != -1)
                    {
                        var inner = line.Substring(i + 7, endTag - (i + 7));
                        if (!string.IsNullOrEmpty(inner))
                        {
                            var measuredSmall = gfx.MeasureString(inner, _smallFont);

                            if (measuredSmall.Width > remainingWidth)
                            {
                                inner = TruncateTextToWidth(gfx, inner, _smallFont, remainingWidth);
                                measuredSmall = gfx.MeasureString(inner, _smallFont);
                            }

                            gfx.DrawString(inner, _smallFont, XBrushes.Black,
                                new XRect(currentX, y, remainingWidth, _smallFont.Size * 1.2),
                                XStringFormats.TopLeft);
                            currentX += measuredSmall.Width;
                        }

                        i = endTag + 8; // move past </font6>
                        continue;
                    }
                }

                // Check for bold marker (**)
                if (i < line.Length - 1 && line[i] == '*' && line[i + 1] == '*')
                {
                    // Find closing **
                    var endIndex = line.IndexOf("**", i + 2, StringComparison.Ordinal);
                    if (endIndex != -1)
                    {
                        var boldText = line.Substring(i + 2, endIndex - (i + 2));
                        var measured = gfx.MeasureString(boldText, _boldFont);

                        if (measured.Width > remainingWidth)
                        {
                            boldText = TruncateTextToWidth(gfx, boldText, _boldFont, remainingWidth);
                            measured = gfx.MeasureString(boldText, _boldFont);
                        }

                        // Draw bold text and measure width accurately
                        gfx.DrawString(boldText, _boldFont, XBrushes.Black,
                            new XRect(currentX, y, remainingWidth, _boldFont.Size * 1.2),
                            XStringFormats.TopLeft);
                        currentX += measured.Width;
                        i = endIndex + 2;
                        continue;
                    }
                }

                // Regular text until next ** or end of line
                var nextBoldIndex = line.IndexOf("**", i, StringComparison.Ordinal);
                var textEnd = nextBoldIndex == -1 ? line.Length : nextBoldIndex;
                var regularText = line.Substring(i, textEnd - i);

                if (!string.IsNullOrEmpty(regularText))
                {
                    var measured = gfx.MeasureString(regularText, _regularFont);

                    if (measured.Width > remainingWidth)
                    {
                        regularText = TruncateTextToWidth(gfx, regularText, _regularFont, remainingWidth);
                        measured = gfx.MeasureString(regularText, _regularFont);
                    }

                    gfx.DrawString(regularText, _regularFont, XBrushes.Black,
                        new XRect(currentX, y, remainingWidth, _regularFont.Size * 1.2), XStringFormats.TopLeft);
                    currentX += measured.Width;
                }

                i = textEnd;
            }
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while drawing markdown line: {ex.Message}",Logger.LogType.Error);
        }
        
    }

    private string TruncateTextToWidth(XGraphics gfx, string text, XFont font, double maxWidth)
    {
        try
        {
            if (string.IsNullOrEmpty(text))
                return text;

            for (var len = text.Length; len > 0; len--)
            {
                var truncated = text.Substring(0, len);
                var measured = gfx.MeasureString(truncated, font);
                if (measured.Width <= maxWidth)
                    return truncated;
            }

            return string.Empty;
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while truncating text to width: {ex.Message}",Logger.LogType.Error);
        }

        return null;
    }

    /// <summary>
    ///     Converts millimeters to points (1 mm = 2.834645669 points)
    /// </summary>
    private double MmToPoints(double mm)
    {
        return mm * 2.834645669;
    }

    private double GetCellWidthMm()
    {
        var availableWidthMm = 210d - _settings.pageMarginLeftMm - _settings.pageMarginRightMm;
        return availableWidthMm / _settings.columnsPerPage;
    }

    private double GetCellHeightMm()
    {
        var availableHeightMm = 297d - _settings.pageMarginTopMm - _settings.pageMarginBottomMm;
        return availableHeightMm / _settings.rowsPerPage;
    }

    // Configuration methods to allow customization

    /// <summary>
    ///     Sets the cell dimensions in millimeters
    /// </summary>
    public void SetCellDimensions(double width, double height)
    {
        if (width <= 0 || height <= 0)
            throw new ArgumentException("Cell dimensions must be positive");
    }

    /// <summary>
    ///     Sets the page margins in millimeters
    /// </summary>
    public void SetMargins(double left, double top, double right, double bottom)
    {
        if (left < 0 || top < 0 || right < 0 || bottom < 0)
            throw new ArgumentException("Margins cannot be negative");
    }

    public void ExportRunningSheets(int setID, string path)
    {
        string international_path = path;
        if (path.EndsWith(".pdf"))
        {
            path = path.Substring(0, path.Length - 4);
            international_path = path;
            path = path + "-Laufzettel.pdf";
            international_path = international_path + "-Laufzettel-International.pdf";
        }
        else
        {
            path = path + "-Laufzettel.pdf";
            international_path = international_path + "-Laufzettel-International.pdf";
        }

        CreateGermanyRunningSheets(setID, path);
        CreateInternationalRunningSheets(setID, international_path);

    }


    public void CreateGermanyRunningSheets(int setID, string path)
    {
        KasAddressList list = Settings._instance.addressSets.GetAddressSetByID(setID);
        var document = new PdfDocument();
        document.Info.Title = $"Laufzettel für {list.Name}";
        document.Info.Subject = "powered by logofclient";
        document.Info.Author = "logofclient";

        var grouped_nums = GroupAddresses(setID).ToList();

        // Zwei Tabellen pro A4-Seite
        int sheets = (grouped_nums.Count + 1) / 2;

        // Layout
        double marginX = 20;
        double marginY = 20;
        double gapY = 12;

        for (int pageIndex = 0; pageIndex < sheets; pageIndex++)
        {
            var page = document.AddPage();
            page.Size = PageSize.A4;
            var gfx = XGraphics.FromPdfPage(page);

            double pageW = page.Width.Point;
            double pageH = page.Height.Point;

            double usableW = pageW - 2 * marginX;
            double usableH = pageH - 2 * marginY;
            double tableH = (usableH - gapY) / 2.0;

            double top1 = marginY;
            double top2 = marginY + tableH + gapY;

            var fontLabel = new XFont("Arial", 6, XFontStyleEx.Bold);
            var fontText = new XFont("Arial", 6, XFontStyleEx.Regular);
            var fontBig = new XFont("Arial", 30, XFontStyleEx.Bold);

            int firstIndex = pageIndex * 2;
            DrawGermanyRunningSheet(
                gfx,
                marginX,
                top1,
                usableW,
                tableH,
                list,
                grouped_nums[firstIndex],
                grouped_nums,
                fontLabel,
                fontText,
                fontBig
            );

            if (firstIndex + 1 < grouped_nums.Count)
            {
                DrawGermanyRunningSheet(
                    gfx,
                    marginX,
                    top2,
                    usableW,
                    tableH,
                    list,
                    grouped_nums[firstIndex + 1],
                    grouped_nums,
                    fontLabel,
                    fontText,
                    fontBig
                );
            }
        }

        document.Save(path);
    }

    private void DrawGermanyRunningSheet(
        XGraphics gfx,
        double x,
        double y,
        double w,
        double h,
        KasAddressList list,
        dynamic result,
        List<(int,string,string,string,int)> grouped_nums,
        XFont fontLabel,
        XFont fontText,
        XFont fontBig)
    {
        double line = 1.0;

        string sender = Customer.GetCustomerByID(list.owner_id)?.sender_address ?? "[Absender]";
        string customerName = Customer.GetCustomerByID(list.owner_id)?.name ?? "[Kunde]";
        string start = result.Item3?.ToString() ?? "[Start]";
        string end = result.Item4?.ToString() ?? "[Ende]";
        string amount = result.Item5?.ToString() ?? "[Anzahl]";
        string groupNo = result.Item2?.ToString() ?? "[PLZ]";
        string fraction = result.Item1?.ToString() ?? "[Fraktion]";

        int total_frac = 0;
        foreach (var item in grouped_nums)
        {
            if (item.Item2 == result.Item2) total_frac++;
        }

        // Outer border
        gfx.DrawRectangle(XPens.Black, x, y, w, h);

        // Row heights
        double r1 = h * 0.1;
        double r2 = h * 0.1;
        double r3 = h * 0.54;
        double r4 = h * 0.30;

        // Main horizontal lines
        gfx.DrawLine(XPens.Black, x, y + r1, x + w, y + r1);
        gfx.DrawLine(XPens.Black, x, y + r1 + r2, x + w, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x, y + r1 + r2 + r3, x + w, y + r1 + r2 + r3);

        // Top row columns
        double c1 = w * 0.39;
        double c2 = w * 0.20;
        double c3 = w * 0.26;
        double c4 = w * 0.15;

        gfx.DrawLine(XPens.Black, x + c1, y, x + c1, y + r1);
        gfx.DrawLine(XPens.Black, x + c1 + c2, y, x + c1 + c2, y + r1);
        gfx.DrawLine(XPens.Black, x + c1 + c2 + c3, y, x + c1 + c2 + c3, y + r1);

        // Second row columns
        gfx.DrawLine(XPens.Black, x + c1, y + r1, x + c1, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x + c1 + c2, y + r1, x + c1 + c2, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x + c1 + c2 + c3, y + r1, x + c1 + c2 + c3, y + r1 + r2);

        // Middle large area split
        double midSplit = x + w * 0.55;
        gfx.DrawLine(XPens.Black, midSplit, y + r1 + r2, midSplit, y + r1 + r2 + r3);

        // Bottom section split
        double leftBottomW = w * 0.42;
        gfx.DrawLine(XPens.Black, x + leftBottomW, y + r1 + r2 + r3, x + leftBottomW, y + h);

        // Bottom left rows
        double blY1 = y + r1 + r2 + r3 + (r4 * 0.14);
        double blY2 = y + r1 + r2 + r3 + (r4 * 0.28);
        double blY3 = y + r1 + r2 + r3 + (r4 * 0.42);
        double blY4 = y + r1 + r2 + r3 + (r4 * 0.56);
        double blY5 = y + r1 + r2 + r3 + (r4 * 0.70);

        gfx.DrawLine(XPens.Black, x, blY1, x + leftBottomW, blY1);
        gfx.DrawLine(XPens.Black, x, blY2, x + leftBottomW, blY2);
        gfx.DrawLine(XPens.Black, x, blY3, x + leftBottomW, blY3);
        gfx.DrawLine(XPens.Black, x, blY4, x + leftBottomW, blY4);
        gfx.DrawLine(XPens.Black, x, blY5, x + leftBottomW, blY5);

        // Labels top row
        gfx.DrawString("Absender:", fontLabel, XBrushes.Black, new XRect(x + 5, y + 4, c1 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Kunden-Nr. Absender:", fontLabel, XBrushes.Black, new XRect(x + c1 + 5, y + 4, c2 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("ZKZ/Titel:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + 4, c3 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Anzahl Sendungen:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + 4, c4 - 10, 14), XStringFormats.TopLeft);

        // Values top row
        gfx.DrawString(sender, fontText, XBrushes.Black, new XRect(x + 5, y + 20, c1 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Kunden-Nr. Absender]", fontText, XBrushes.Black, new XRect(x + c1 + 5, y + 20, c2 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[ZKZ/Titel]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + 20, c3 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString(amount, fontText, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + 20, c4 - 10, r1 - 22), XStringFormats.TopLeft);

        // Second row labels
        gfx.DrawString("Einlieferer:", fontLabel, XBrushes.Black, new XRect(x + 5, y + r1 + 4, c1 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Kunden-Nr. Einlieferer:", fontLabel, XBrushes.Black, new XRect(x + c1 + 5, y + r1 + 4, c2 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Interne Vermerke:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + r1 + 4, c3 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Laufzeit", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + r1 + 4, c4 - 10, 14), XStringFormats.TopLeft);

        // Second row values
        gfx.DrawString(customerName, fontText, XBrushes.Black, new XRect(x + 5, y + r1 + 20, c1 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Kunden-Nr. Einlieferer]", fontText, XBrushes.Black, new XRect(x + c1 + 5, y + r1 + 20, c2 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Interne Vermerke]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + r1 + 20, c3 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Laufzeit]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + r1 + 20, c4 - 10, r2 - 22), XStringFormats.TopLeft);

        // Middle area
        gfx.DrawString(groupNo, fontBig, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + 5, w * 0.50 - 10, r3 - 10),
            XStringFormats.Center);
        
        gfx.DrawString("PRESSE/ELN", fontBig, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + 5, w * 0.50 - 10, r3 - 90),
            XStringFormats.Center);

        gfx.DrawString($"Fraktion {fraction}/{total_frac}", fontText, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + r3 - 18, w * 0.50 - 10, 14),
            XStringFormats.CenterLeft);

        gfx.DrawString("Bereich für postalische Zwecke:", fontLabel, XBrushes.Black,
            new XRect(midSplit + 5, y + r1 + r2 + 4, w - (midSplit - x) - 10, 14),
            XStringFormats.TopLeft);

        // Bottom left labels
        // Bottom left labels
        gfx.DrawString("Einlieferungsdatum:", fontLabel, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + r3 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("AM-Auftragsnummer:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY1 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bundgewicht:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY2 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Paletten-Nr.:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY3 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bund-Nr./Bunde auf Palette:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY4 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bund-Nr. von Gesamtanzahl:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY5 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        // Bottom placeholders rechts daneben, gleiche Zeile
        double valueX = x + leftBottomW * 0.55;
        double valueW = leftBottomW - (valueX - x) - 5;

        gfx.DrawString("[Einlieferungsdatum]", fontText, XBrushes.Black,
            new XRect(valueX, y + r1 + r2 + r3 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[AM-Auftragsnummer]", fontText, XBrushes.Black,
            new XRect(valueX, blY1 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Bundgewicht]", fontText, XBrushes.Black,
            new XRect(valueX, blY2 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Paletten-Nr.]", fontText, XBrushes.Black,
            new XRect(valueX, blY3 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Bund-Nr./Bunde auf Palette]", fontText, XBrushes.Black,
            new XRect(valueX, blY4 + 4, valueW, 14),
            XStringFormats.TopRight);
            
        gfx.DrawString("[Bund-Nr. von Gesamtanzahl]", fontText, XBrushes.Black,
            new XRect(valueX, blY5 + 4, valueW, 14),
            XStringFormats.TopRight);


        // Right bottom postal area label
        gfx.DrawString("Feld für Palettenlabel/NVE:", fontLabel, XBrushes.Black,
            new XRect(x + leftBottomW + 5, y + r1 + r2 + r3 + 4, w - leftBottomW - 10, 14),
            XStringFormats.TopLeft);
    }
    
    // public void CreateInternationalRunningSheets(int setID, string path)
    // {
    //     KasAddressList list = Settings._instance.addressSets.GetAddressSetByID(setID);
    //     var document = new PdfDocument();
    //     document.Info.Title = $"Laufzettel für {list.Name}";
    //     document.Info.Subject = "powered by logofclient";
    //     document.Info.Author = "logofclient";
    //
    //     int margin = 50;
    //
    //     var grouped_nums = GroupAddressesInternational(setID);
    //
    //     foreach (var result in grouped_nums)
    //     {
    //         var page = document.AddPage();
    //         page.Size = PageSize.A4;
    //
    //         var gfx = XGraphics.FromPdfPage(page);
    //
    //         var width = page.Width.Point-margin;
    //         var height = page.Height.Point-margin;
    //         gfx.DrawLine(XPens.Black, margin, margin, margin, height);
    //         gfx.DrawLine(XPens.Black, margin, margin, width, margin);
    //         gfx.DrawLine(XPens.Black, width, margin, width, height);
    //         gfx.DrawLine(XPens.Black, margin, height, width, height);
    //
    //         var boldfont = new XFont("Cantarell", 11, XFontStyleEx.Bold);
    //         var font = new XFont("Cantarell", 11, XFontStyleEx.Regular);
    //         var bigboldfont = new XFont("Cantarell", 35, XFontStyleEx.Bold);
    //         
    //         // Versandinfo
    //         gfx.DrawString($"Versand {list.Name}", boldfont, XBrushes.Black,
    //             new XRect(margin+5, margin, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"Start: ", font, XBrushes.Black,
    //             new XRect(margin+5, margin+25, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"{result.Item3}", font, XBrushes.Black,
    //             new XRect(margin+75, margin+25, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"Ende: ", font, XBrushes.Black,
    //             new XRect(margin+5, margin+40, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"{result.Item4}", font, XBrushes.Black,
    //             new XRect(margin+75, margin+40, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"Kunde: ", font, XBrushes.Black,
    //             new XRect(margin+5, margin+55, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"{Customer.GetCustomerByID(list.owner_id).name}", font, XBrushes.Black,
    //             new XRect(margin+75, margin+55, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"Absender: ", font, XBrushes.Black,
    //             new XRect(margin+5, margin+70, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"{Customer.GetCustomerByID(list.owner_id).sender_address}", font, XBrushes.Black,
    //             new XRect(margin+75, margin+70, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"Anzahl: ", font, XBrushes.Black,
    //             new XRect(margin+5, margin+85, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"{result.Item5}", font, XBrushes.Black,
    //             new XRect(margin+75, margin+85, width-margin, 25), XStringFormats.CenterLeft);
    //         
    //         // logofclient ad
    //         gfx.DrawString($"powered by logofclient", font, XBrushes.Black,
    //             new XRect(margin+5, height-55, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"(c) 2026 MyPapertown", font, XBrushes.Black,
    //             new XRect(margin+5, height-40, width-margin, 25), XStringFormats.CenterLeft);
    //         gfx.DrawString($"mypapercloud.de/logof", font, XBrushes.Black,
    //             new XRect(margin+5, height-25, width-margin, 25), XStringFormats.CenterLeft);
    //
    //         
    //         int total_frac = 0;
    //         foreach (var item in grouped_nums)
    //         {
    //             if (item.Item2 == result.Item2) total_frac++;
    //         }
    //         
    //         // group number
    //         gfx.DrawString($"{result.Item2}", bigboldfont, XBrushes.Black,
    //             new XRect(margin, margin, width-margin, (height-margin)/2), XStringFormats.Center);
    //         gfx.DrawString($"Fraktion {result.Item1}/{total_frac}", font, XBrushes.Black,
    //             new XRect(margin, margin, width-margin, (height-margin)/2 + 50), XStringFormats.Center);
    //     }
    //
    //     if (document.PageCount > 0)
    //     {
    //         document.Save(path);    
    //     }
    //     
    // }
    
    public void CreateInternationalRunningSheets(int setID, string path)
    {
        KasAddressList list = Settings._instance.addressSets.GetAddressSetByID(setID);

        var document = new PdfDocument();
        document.Info.Title = $"Laufzettel für {list.Name}";
        document.Info.Subject = "powered by logofclient";
        document.Info.Author = "logofclient";

        var grouped_nums = GroupAddressesInternational(setID).ToList();

        int sheets = (grouped_nums.Count + 1) / 2;

        double marginX = 20;
        double marginY = 20;
        double gapY = 12;

        for (int pageIndex = 0; pageIndex < sheets; pageIndex++)
        {
            var page = document.AddPage();
            page.Size = PageSize.A4;

            var gfx = XGraphics.FromPdfPage(page);

            double pageW = page.Width.Point;
            double pageH = page.Height.Point;

            double usableW = pageW - 2 * marginX;
            double usableH = pageH - 2 * marginY;
            double tableH = (usableH - gapY) / 2.0;

            double top1 = marginY;
            double top2 = marginY + tableH + gapY;

            var fontLabel = new XFont("Arial", 6, XFontStyleEx.Bold);
            var fontText = new XFont("Arial", 6, XFontStyleEx.Regular);
            var fontBig = new XFont("Arial", 30, XFontStyleEx.Bold);

            int firstIndex = pageIndex * 2;

            DrawInternationalRunningSheet(
                gfx,
                marginX,
                top1,
                usableW,
                tableH,
                list,
                grouped_nums[firstIndex],
                grouped_nums,
                fontLabel,
                fontText,
                fontBig
            );

            if (firstIndex + 1 < grouped_nums.Count)
            {
                DrawInternationalRunningSheet(
                    gfx,
                    marginX,
                    top2,
                    usableW,
                    tableH,
                    list,
                    grouped_nums[firstIndex + 1],
                    grouped_nums,
                    fontLabel,
                    fontText,
                    fontBig
                );
            }
        }

        document.Save(path);
    }
        private void DrawInternationalRunningSheet(
        XGraphics gfx,
        double x,
        double y,
        double w,
        double h,
        KasAddressList list,
        dynamic result,
        List<(int,string,string,string,int)> grouped_nums,
        XFont fontLabel,
        XFont fontText,
        XFont fontBig)
    {
        double line = 1.0;

        string sender = Customer.GetCustomerByID(list.owner_id)?.sender_address ?? "[Absender]";
        string customerName = Customer.GetCustomerByID(list.owner_id)?.name ?? "[Kunde]";
        string start = result.Item3?.ToString() ?? "[Start]";
        string end = result.Item4?.ToString() ?? "[Ende]";
        string amount = result.Item5?.ToString() ?? "[Anzahl]";
        string groupNo = result.Item2?.ToString() ?? "[PLZ]";
        string fraction = result.Item1?.ToString() ?? "[Fraktion]";

        int total_frac = 0;
        foreach (var item in grouped_nums)
        {
            if (item.Item2 == result.Item2) total_frac++;
        }

        // Outer border
        gfx.DrawRectangle(XPens.Black, x, y, w, h);

        // Row heights
        double r1 = h * 0.1;
        double r2 = h * 0.1;
        double r3 = h * 0.54;
        double r4 = h * 0.30;

        // Main horizontal lines
        gfx.DrawLine(XPens.Black, x, y + r1, x + w, y + r1);
        gfx.DrawLine(XPens.Black, x, y + r1 + r2, x + w, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x, y + r1 + r2 + r3, x + w, y + r1 + r2 + r3);

        // Top row columns
        double c1 = w * 0.39;
        double c2 = w * 0.20;
        double c3 = w * 0.26;
        double c4 = w * 0.15;

        gfx.DrawLine(XPens.Black, x + c1, y, x + c1, y + r1);
        gfx.DrawLine(XPens.Black, x + c1 + c2, y, x + c1 + c2, y + r1);
        gfx.DrawLine(XPens.Black, x + c1 + c2 + c3, y, x + c1 + c2 + c3, y + r1);

        // Second row columns
        gfx.DrawLine(XPens.Black, x + c1, y + r1, x + c1, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x + c1 + c2, y + r1, x + c1 + c2, y + r1 + r2);
        gfx.DrawLine(XPens.Black, x + c1 + c2 + c3, y + r1, x + c1 + c2 + c3, y + r1 + r2);

        // Middle large area split
        double midSplit = x + w * 0.55;
        gfx.DrawLine(XPens.Black, midSplit, y + r1 + r2, midSplit, y + r1 + r2 + r3);

        // Bottom section split
        double leftBottomW = w * 0.42;
        gfx.DrawLine(XPens.Black, x + leftBottomW, y + r1 + r2 + r3, x + leftBottomW, y + h);

        // Bottom left rows
        double blY1 = y + r1 + r2 + r3 + (r4 * 0.14);
        double blY2 = y + r1 + r2 + r3 + (r4 * 0.28);
        double blY3 = y + r1 + r2 + r3 + (r4 * 0.42);
        double blY4 = y + r1 + r2 + r3 + (r4 * 0.56);
        double blY5 = y + r1 + r2 + r3 + (r4 * 0.70);

        gfx.DrawLine(XPens.Black, x, blY1, x + leftBottomW, blY1);
        gfx.DrawLine(XPens.Black, x, blY2, x + leftBottomW, blY2);
        gfx.DrawLine(XPens.Black, x, blY3, x + leftBottomW, blY3);
        gfx.DrawLine(XPens.Black, x, blY4, x + leftBottomW, blY4);
        gfx.DrawLine(XPens.Black, x, blY5, x + leftBottomW, blY5);

        // Labels top row
        gfx.DrawString("Absender:", fontLabel, XBrushes.Black, new XRect(x + 5, y + 4, c1 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Kunden-Nr. Absender:", fontLabel, XBrushes.Black, new XRect(x + c1 + 5, y + 4, c2 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("ZKZ/Titel:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + 4, c3 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Anzahl Sendungen:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + 4, c4 - 10, 14), XStringFormats.TopLeft);

        // Values top row
        gfx.DrawString(sender, fontText, XBrushes.Black, new XRect(x + 5, y + 20, c1 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Kunden-Nr. Absender]", fontText, XBrushes.Black, new XRect(x + c1 + 5, y + 20, c2 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[ZKZ/Titel]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + 20, c3 - 10, r1 - 22), XStringFormats.TopLeft);
        gfx.DrawString(amount, fontText, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + 20, c4 - 10, r1 - 22), XStringFormats.TopLeft);

        // Second row labels
        gfx.DrawString("Einlieferer:", fontLabel, XBrushes.Black, new XRect(x + 5, y + r1 + 4, c1 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Kunden-Nr. Einlieferer:", fontLabel, XBrushes.Black, new XRect(x + c1 + 5, y + r1 + 4, c2 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Interne Vermerke:", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + r1 + 4, c3 - 10, 14), XStringFormats.TopLeft);
        gfx.DrawString("Laufzeit", fontLabel, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + r1 + 4, c4 - 10, 14), XStringFormats.TopLeft);

        // Second row values
        gfx.DrawString(customerName, fontText, XBrushes.Black, new XRect(x + 5, y + r1 + 20, c1 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Kunden-Nr. Einlieferer]", fontText, XBrushes.Black, new XRect(x + c1 + 5, y + r1 + 20, c2 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Interne Vermerke]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + 5, y + r1 + 20, c3 - 10, r2 - 22), XStringFormats.TopLeft);
        gfx.DrawString("[Laufzeit]", fontText, XBrushes.Black, new XRect(x + c1 + c2 + c3 + 5, y + r1 + 20, c4 - 10, r2 - 22), XStringFormats.TopLeft);

        // Middle area
        gfx.DrawString(groupNo, fontBig, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + 5, w * 0.50 - 10, r3 - 10),
            XStringFormats.Center);
        
        gfx.DrawString("PRESSE/ELN", fontBig, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + 5, w * 0.50 - 10, r3 - 90),
            XStringFormats.Center);

        gfx.DrawString($"Fraktion {fraction}/{total_frac}", fontText, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + r3 - 18, w * 0.50 - 10, 14),
            XStringFormats.CenterLeft);

        gfx.DrawString("Bereich für postalische Zwecke:", fontLabel, XBrushes.Black,
            new XRect(midSplit + 5, y + r1 + r2 + 4, w - (midSplit - x) - 10, 14),
            XStringFormats.TopLeft);

        // Bottom left labels
        // Bottom left labels
        gfx.DrawString("Einlieferungsdatum:", fontLabel, XBrushes.Black,
            new XRect(x + 5, y + r1 + r2 + r3 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("AM-Auftragsnummer:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY1 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bundgewicht:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY2 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Paletten-Nr.:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY3 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bund-Nr./Bunde auf Palette:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY4 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        gfx.DrawString("Bund-Nr. von Gesamtanzahl:", fontLabel, XBrushes.Black,
            new XRect(x + 5, blY5 + 4, leftBottomW - 10, 14),
            XStringFormats.TopLeft);

        // Bottom placeholders rechts daneben, gleiche Zeile
        double valueX = x + leftBottomW * 0.55;
        double valueW = leftBottomW - (valueX - x) - 5;

        gfx.DrawString("[Einlieferungsdatum]", fontText, XBrushes.Black,
            new XRect(valueX, y + r1 + r2 + r3 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[AM-Auftragsnummer]", fontText, XBrushes.Black,
            new XRect(valueX, blY1 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Bundgewicht]", fontText, XBrushes.Black,
            new XRect(valueX, blY2 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Paletten-Nr.]", fontText, XBrushes.Black,
            new XRect(valueX, blY3 + 4, valueW, 14),
            XStringFormats.TopRight);

        gfx.DrawString("[Bund-Nr./Bunde auf Palette]", fontText, XBrushes.Black,
            new XRect(valueX, blY4 + 4, valueW, 14),
            XStringFormats.TopRight);
            
        gfx.DrawString("[Bund-Nr. von Gesamtanzahl]", fontText, XBrushes.Black,
            new XRect(valueX, blY5 + 4, valueW, 14),
            XStringFormats.TopRight);


        // Right bottom postal area label
        gfx.DrawString("Feld für Palettenlabel/NVE:", fontLabel, XBrushes.Black,
            new XRect(x + leftBottomW + 5, y + r1 + r2 + r3 + 4, w - leftBottomW - 10, 14),
            XStringFormats.TopLeft);
    }
    
    /// <summary>
    /// Calculates address groups to summarize for the single pages of the running sheets.
    /// </summary>
    /// <param name="setID"></param>
    /// <returns>List of quadruples consisting of a number and the starting of the plz, as well as first, last plz and total amount of addresses</returns>
    public List<(int, string, string, string, int)> GroupAddresses(int setID)
    {
        int grpcount = Settings._instance.pdfExport.rsNumGrouped; // Amount of addresses per group
        int stpoint = Settings._instance.pdfExport.rsPlzStartpoint; // group starting point (first n characters of the plz)
        KasAddressList list = Settings._instance.addressSets.GetAddressSetByID(setID);
        if (list == null)
            throw new Exception("AddressSet nicht gefunden");
        
        List<(int, string, string, string, int)> output = new();

        List<IGrouping<string, KasPerson>> sorted_list = list.KasPersons
            .Where(x => !string.IsNullOrEmpty(x?.used_plz) &&
                        x.used_plz.Length >= stpoint && x.IsGermany())
            .OrderBy(x => x.used_plz)
            .GroupBy(x => x.used_plz.Substring(0, stpoint))
            .ToList();
        
        foreach (var group in sorted_list)
        {
            string start = group.Key;
            int fraktion = 0;

            for (int count = 0; count < group.Count(); count += grpcount)
            {
                fraktion++;

                int currentGroupSize = Math.Min(grpcount, group.Count() - count);

                string first = group.ElementAt(count).used_plz;
                string last = group.ElementAt(count + currentGroupSize - 1).used_plz;

                output.Add((fraktion, start, first, last, currentGroupSize));
            }
        }

        return output;
    }
    
    public List<(int, string, string, string, int)> GroupAddressesInternational(int setID)
    {
        int grpcount = Settings._instance.pdfExport.rsNumGrouped; // Amount of addresses per group
        KasAddressList list = Settings._instance.addressSets.GetAddressSetByID(setID);
        if (list == null)
            throw new Exception("AddressSet nicht gefunden");
        
        List<(int, string, string, string, int)> output = new();

        List<IGrouping<string, KasPerson>> sorted_list = list.KasPersons
            .Where(x => !string.IsNullOrEmpty(x?.used_plz) && !x.IsGermany())
            .OrderBy(x => x.used_plz)
            .GroupBy(x => x.land)
            .ToList();
        
        foreach (var group in sorted_list)
        {
            string start = group.Key;
            int fraktion = 0;

            for (int count = 0; count < group.Count(); count += grpcount)
            {
                fraktion++;

                int currentGroupSize = Math.Min(grpcount, group.Count() - count);

                string first = group.ElementAt(count).used_plz;
                string last = group.ElementAt(count + currentGroupSize - 1).used_plz;

                output.Add((fraktion, start, first, last, currentGroupSize));
            }
        }

        return output;
    }
}