using System.Diagnostics;
using ClosedXML.Excel;
using ClosedXML.Excel.Drawings;
using ClosedXML.Graphics;

namespace NejCommon.Utils;

public class FakeGraphicsEngine : IXLGraphicEngine
{
    private static double PointsToPixels(double points, double dpi)
    {
        return points / 72.0 * dpi / 10.0;
    }
    public double GetDescent(IXLFontBase font, double dpiY)
    {
        return PointsToPixels(font.FontSize, dpiY);
    }

    public GlyphBox GetGlyphBox(ReadOnlySpan<int> graphemeCluster, IXLFontBase font, Dpi dpi)
    {
        int num = graphemeCluster.ToArray().Sum();

        double value = PointsToPixels(font.FontSize, dpi.X);
        double value2 = PointsToPixels((double)num * font.FontSize, dpi.X);
        return new GlyphBox(descent: (float)Math.Round(GetDescent(font, dpi.Y), MidpointRounding.AwayFromZero), advanceWidth: (float)Math.Round(value2, MidpointRounding.AwayFromZero), emSize: (float)Math.Round(value, MidpointRounding.AwayFromZero));

    }

    public double GetMaxDigitWidth(IXLFontBase font, double dpiX)
    {
        return PointsToPixels(font.FontSize, dpiX);
    }

    public XLPictureInfo GetPictureInfo(Stream imageStream, XLPictureFormat expectedFormat)
    {
        return DefaultGraphicEngine.Instance.Value.GetPictureInfo(imageStream, expectedFormat);
    }

    public double GetTextHeight(IXLFontBase font, double dpiY)
    {
        return PointsToPixels(font.FontSize, dpiY);
    }

    public double GetTextWidth(string text, IXLFontBase font, double dpiX)
    {
        return PointsToPixels(text?.Length ?? 0 * font.FontSize, dpiX);
    }
}

public static class ClosedXMLSetup
{
    public static void Setup()
    {
        var font = GetFont();
        if (font != null)
        {
            Console.WriteLine("ClosedXML: Using: " + font);
            LoadOptions.DefaultGraphicEngine = new DefaultGraphicEngine(font);
        }
        else
        {            
            Console.WriteLine("ClosedXML: Using stub GE");
            LoadOptions.DefaultGraphicEngine = new FakeGraphicsEngine();
        }
    }

    static string GetFont()
    {
        foreach (var orderFont in new string[] { "Calibri", "Microsoft Sans Serif", "Carlito", "Liberation Sans" })
        {
            foreach (var fontFamily in SixLabors.Fonts.SystemFonts.Collection.Families)
            {
                if (fontFamily.Name == orderFont)
                    return fontFamily.Name;
            }
        }
        return null;
    }
}