using System.Drawing;
/// Copyright (c) 2021 Iiro Iivanainen, Harri Linna, Jere Pakkanen, Riikka Vilavaara
/// 
/// Permission is hereby granted, free of charge, to any person obtaining
/// a copy of this software and associated documentation files (the
/// "Software"), to deal in the Software without restriction, including
/// without limitation the rights to use, copy, modify, merge, publish,
/// distribute, sublicense, and/or sell copies of the Software, and to
/// permit persons to whom the Software is furnished to do so, subject to
/// the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included
/// in all copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
/// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
/// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
/// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
/// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
/// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
/// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System.Numerics;
using System.IO;
using System.Media;
using System.Windows.Media.Imaging;

using ImageMagick;

namespace WPFOpenGL
{
    public static class BitmapManager
    {
        public static Bitmap CreateBitmap(float[] data, int width, int height)
        {
            Bitmap bitmap = new Bitmap(width, height);
            for (int i = 0; i < width; i++)
            {
                for (int j = 0; j < height; j++)
                {
                    int r = (int) data[i*height + j];
                    int g = (int) data[i*height + j];
                    int b = (int) data[i*height + j];

                    Color color = Color.FromArgb(r, g, b);
                    bitmap.SetPixel(i, j, color);
                }
            }
            return bitmap;
        }

        private static float[] scale(float[] data, float newmin, float newmax)
        {
            float oldmin = float.MaxValue;
            float oldmax = float.MinValue;
            foreach (float val in data)
            {
                oldmin = val <= oldmin ? val : oldmin;
                oldmax = val >= oldmax ? val : oldmax;
            }

            float[] newdata = new float[data.Length];
            for (int i = 0; i < data.Length; i++)
            {
                newdata[i] = scale(data[i], oldmin, oldmax, newmin, newmax);
            }
            return newdata;
        }

        public static float scale(float val, float oldmin, float oldmax, float newmin, float newmax)
        {
            return (newmax - newmin) * ((val - oldmin) / (oldmax - oldmin)) + newmin;
        }
    }

    public static class TextureManager
    {
        public static System.Drawing.Bitmap TextureTiff1(string filepath)
        {
            // MagickImage -> BitmapImage -> Bitmap (current)
            return BitmapImageToBitmap(BytesToBitmapImage(MagickImageToBytes(filepath)));
        }

        public static System.Drawing.Bitmap TextureTiff2(string filepath)
        {
            // FileStream -> BitmapSource -> Bitmap (alternative)
            return BitmapSourceToBitmap(BitmapSourceFromTiff(filepath));
        }

        private static System.Drawing.Bitmap BitmapSourceToBitmap(BitmapSource bitmapsource)
        {
            System.Drawing.Bitmap bitmap;
            using (MemoryStream outStream = new MemoryStream())
            {
                BitmapEncoder enc = new BmpBitmapEncoder();
                enc.Frames.Add(BitmapFrame.Create(bitmapsource));
                enc.Save(outStream);
                bitmap = new System.Drawing.Bitmap(outStream);
            }
            return bitmap;
        }

        private static BitmapSource BitmapSourceFromTiff(string filepath)
        {
            Stream imageStreamSource = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read);
            var decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            BitmapSource bitmapSource = decoder.Frames[0];
            return bitmapSource;
        }

        public static byte[] MagickImageToBytes(string filepath)
        {
            using (var magickImage = new MagickImage(filepath))
            {
                return magickImage.ToByteArray();
            }
        }

        public static BitmapImage BytesToBitmapImage(byte[] bytes)
        {
            var bitmapImage = new BitmapImage();
            using (MemoryStream stream = new MemoryStream(bytes))
            {
                stream.Position = 0;
                bitmapImage.BeginInit();
                bitmapImage.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
                bitmapImage.UriSource = null;
                bitmapImage.StreamSource = stream;
                bitmapImage.EndInit();
            }
            return bitmapImage;
        }

        public static System.Drawing.Bitmap BitmapImageToBitmap(BitmapImage bitmapImage)
        {
            System.Drawing.Bitmap bitmap;
            using(MemoryStream stream = new MemoryStream())
            {
                BitmapEncoder encoder = new BmpBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(bitmapImage));
                encoder.Save(stream);
                bitmap = new System.Drawing.Bitmap(stream);
            }
            return bitmap;
        }
    }
}