using System;
using System.Collections.Generic;
using OpenCvSharp;
using MMDeploy;

namespace image_segmentation
{
    class Program
    {
        /// <summary>
        /// transform input
        /// </summary>
        static void CvMatToMat(OpenCvSharp.Mat[] cvMats, out MMDeploy.Mat[] mats)
        {
            mats = new MMDeploy.Mat[cvMats.Length];
            unsafe
            {
                for (int i = 0; i < cvMats.Length; i++)
                {
                    mats[i].Data = cvMats[i].DataPointer;
                    mats[i].Height = cvMats[i].Height;
                    mats[i].Width = cvMats[i].Width;
                    mats[i].Channel = cvMats[i].Dims;
                    mats[i].Format = PixelFormat.BGR;
                    mats[i].Type = DataType.Int8;
                    mats[i].Device = null;
                }
            }
        }

        static void CvWaitKey()
        {
            Cv2.WaitKey();
        }

        static Vec3b[] GenPalette(int classes)
        {
            Random rnd = new Random(0);
            Vec3b[] palette = new Vec3b[classes];
            for (int i = 0; i < classes; i++)
            {
                byte v1 = (byte)rnd.Next(0, 255);
                byte v2 = (byte)rnd.Next(0, 255);
                byte v3 = (byte)rnd.Next(0, 255);
                palette[i] = new Vec3b(v1, v2, v3);
            }
            return palette;
        }

        static void Main(string[] args)
        {
            if (args.Length != 3)
            {
                Console.WriteLine("usage:\n  image_segmentation deviceName modelPath imagePath\n");
                Environment.Exit(1);
            }

            string deviceName = args[0];
            string modelPath = args[1];
            string imagePath = args[2];

            // 1. create handle
            Segmentor handle = new Segmentor(modelPath, deviceName, 0);

            // 2. prepare input
            OpenCvSharp.Mat[] imgs = new OpenCvSharp.Mat[1] { Cv2.ImRead(imagePath, ImreadModes.Color) };
            CvMatToMat(imgs, out var mats);

            // 3. process
            List<SegmentorOutput> output = handle.Apply(mats);

            // 4. show result
            OpenCvSharp.Mat colorMask = new OpenCvSharp.Mat(output[0].Height, output[0].Width, MatType.CV_8UC3, new Scalar());
            Vec3b[] palette = GenPalette(output[0].Classes);
            unsafe
            {
                byte* data = colorMask.DataPointer;
                if (output[0].Mask.Length > 0)
                {
                    fixed (int* _label = output[0].Mask)
                    {
                        int* label = _label;
                        for (int i = 0; i < output[0].Height; i++)
                        {
                            for (int j = 0; j < output[0].Width; j++)
                            {
                                data[0] = palette[*label][0];
                                data[1] = palette[*label][1];
                                data[2] = palette[*label][2];
                                data += 3;
                                label++;
                            }
                        }
                    }
                }
                else
                {
                    int pos = 0;
                    fixed (float* _score = output[0].Score)
                    {
                        float *score = _score;
                        int total = output[0].Height * output[0].Width;
                        for (int i = 0; i < output[0].Height; i++)
                        {
                            for (int j = 0; j < output[0].Width; j++)
                            {
                                List<Tuple<float, int>> scores = new List<Tuple<float, int>>();
                                for (int k = 0; k < output[0].Classes; k++)
                                {
                                    scores.Add(new Tuple<float, int>(score[k * total + i * output[0].Width + j], k));
                                }
                                scores.Sort();
                                data[0] = palette[scores[^1].Item2][0];
                                data[1] = palette[scores[^1].Item2][1];
                                data[2] = palette[scores[^1].Item2][2];
                                data += 3;
                            }
                        }
                    }
                }

            }
            colorMask = imgs[0] * 0.5 + colorMask * 0.5;

            Cv2.NamedWindow("mmseg", WindowFlags.GuiExpanded);
            Cv2.ImShow("mmseg", colorMask);
            CvWaitKey();

            handle.Close();
        }
    }
}
