using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;

namespace ThermoCamUtils
{
    public class PerspectiveTransform
    {
        Point2f[] srcPoints = new Point2f[] {
            new Point2f(0, 0),
            new Point2f(0, 0),
            new Point2f(0, 0),
            new Point2f(0, 0),
        };

        Point2f[] dstPoints = new Point2f[] {
            new Point2f(600, 0),
            new Point2f(0, 0),
            new Point2f(0, 400),
            new Point2f(600, 400),
        };

        protected Mat OriginalImage;



        public PerspectiveTransform(List<System.Drawing.Point> _srcPoints, List<System.Drawing.Point> _dstPoints)
        {
            srcPoints = convertPoints(_srcPoints);
            dstPoints = convertPoints(_dstPoints);
        }

        protected Point2f[] convertPoints(List<System.Drawing.Point> origList)
        {
            Point2f[] answ = new Point2f[origList.Count];
            for (int i = 0; i < origList.Count; i++)
            {
                answ[i] = new Point2f(origList[i].X, origList[i].Y);
            }
            return answ;
        }

        public Bitmap convertImage(Bitmap OrigImage, int dimX, int dimY)
        {
            Bitmap answ = OrigImage;
            OriginalImage = OpenCvSharp.Extensions.BitmapConverter.ToMat(OrigImage);
            // verifica siano 4 sorgente e 4 dest...
            if (srcPoints.Length == 4 && dstPoints.Length == 4)
            {
                using var matrix = Cv2.GetPerspectiveTransform(srcPoints, dstPoints);
                using var dst = new Mat(new OpenCvSharp.Size(dimX, dimY), MatType.CV_8UC3);
                Cv2.WarpPerspective(OriginalImage, dst, matrix, dst.Size());

                answ = MatToBitmap(dst);
            }

            return answ;
        }

        // This is the function that converts IplImage image
        // into Bitmap
        public static Bitmap MatToBitmap(Mat image)
        {
            return OpenCvSharp.Extensions.BitmapConverter.ToBitmap(image);
        }
    }
}