using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using OpenCvSharp;
using OpenCvSharp.Extensions;
using Size = OpenCvSharp.Size;
using Point = OpenCvSharp.Point;

namespace Com.Lmc.ShuiYin.One.Util
{
    public class Utils
    {
        public static Mat Read(string image, int type)
        {
            // Map Java CV_8S (1) -> Color, CV_8U (0) -> Grayscale
            ImreadModes mode = ImreadModes.Unchanged;
            if (type == 1) mode = ImreadModes.Color;
            else if (type == 0) mode = ImreadModes.Grayscale;
            else mode = (ImreadModes)type;

            Mat src = Cv2.ImRead(image, mode);
            if (src.Empty())
            {
                Console.WriteLine("File not found!");
                Environment.Exit(-1);
            }
            return src;
        }

        public static void Show(Mat mat)
        {
            Cv2.ImShow("Utils", mat);
            Cv2.WaitKey(0);
        }

        public static Mat OptimalDft(Mat srcImg)
        {
            Mat padded = new Mat();
            int opRows = Cv2.GetOptimalDFTSize(srcImg.Rows);
            int opCols = Cv2.GetOptimalDFTSize(srcImg.Cols);
            Cv2.CopyMakeBorder(srcImg, padded, 0, opRows - srcImg.Rows,
                0, opCols - srcImg.Cols, BorderTypes.Constant, Scalar.All(0));
            return padded;
        }

        public static bool IsAscii(string str)
        {
            foreach (char c in str)
            {
                if (c > 127) // Simple ASCII check
                {
                    return false;
                }
            }
            return true;
        }

        public static Mat DrawNonAscii(string watermark)
        {
            // Create a dummy bitmap to measure string
            using (Bitmap dummy = new Bitmap(1, 1))
            using (Graphics gDummy = Graphics.FromImage(dummy))
            {
                Font font = new Font("Arial", 64, FontStyle.Regular, GraphicsUnit.Pixel);
                // In Java code: Font font = new Font("Default", Font.PLAIN, 64);
                // "Default" might not exist in Windows fonts, usually maps to Dialog or SansSerif.
                // I'll use "Arial" or generic SansSerif.
                
                SizeF size = gDummy.MeasureString(watermark, font);
                int width = (int)Math.Ceiling(size.Width);
                int height = (int)Math.Ceiling(size.Height);

                // Create actual bitmap
                Bitmap bufferedImage = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb); 
                // Java uses TYPE_BYTE_GRAY, but System.Drawing doesn't support drawing to 8bpp easily.
                // We will draw to RGB and convert to Gray later or let OpenCV handle it.
                
                using (Graphics graphics = Graphics.FromImage(bufferedImage))
                {
                    graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
                    graphics.CompositingQuality = CompositingQuality.HighQuality;
                    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    
                    graphics.Clear(Color.Black); // Assuming background is black? Java code says `new BufferedImage`. Default is 0 (black).
                    // Java code: graphics.setColor(Color.WHITE); graphics.drawString(watermark, 0, metrics.getAscent());
                    
                    graphics.DrawString(watermark, font, Brushes.White, 0, 0);
                }

                // Convert to Mat
                Mat res = BitmapConverter.ToMat(bufferedImage);
                // Convert to grayscale CV_8U
                Cv2.CvtColor(res, res, ColorConversionCodes.BGR2GRAY);
                
                Cv2.ImWrite("C:\\tools\\shuiyin.png", res); // Keep path as requested
                return res;
            }
        }

        public static void FixSize(Mat src, Mat mirror)
        {
            if (src.Rows != mirror.Rows)
            {
                Cv2.CopyMakeBorder(src, src, 0, mirror.Rows - src.Rows,
                    0, 0, BorderTypes.Constant, Scalar.All(0));
            }
            if (src.Cols != mirror.Cols)
            {
                Cv2.CopyMakeBorder(src, src, 0, 0,
                    0, mirror.Cols - src.Cols, BorderTypes.Constant, Scalar.All(0));
            }
        }
    }
}