using System;
using System.IO;
using System.Linq;
using ImageSharp;
using SixLabors.Primitives;

namespace fix
{
    class Program
    {
        static void Main(string[] args)
        {
            // reduced resolution camera JPEGs
            var smalls = Directory.GetFiles("path/S").OrderBy(p => p);
            // target path for fixed files
            var tPath = "path/T/";

            foreach (var path in smalls)
            {
                using (FileStream sStream = File.OpenRead(path))
                // full resolution JPEGs from RAWs
                using (FileStream lStream = File.OpenRead(path.Replace("/S/", "/L/")))
                {
                    var small = Image.Load(sStream);
                    var large = Image.Load(lStream);
                    Rectangle rect = new Rectangle();

                    // image height of the reduced resolution image with in-camera cropping
                    // it's always height, the portrait (2:3) mode is only in EXIF
                    if (small.Height == 1360)
                    {
                        // crop rectangle on the full resolution image (see above)
                        rect = new Rectangle(0, 168, 4000, 2664);
                    }

                    // this file has been cropped
                    if (rect.Width != 0)
                    {
                        using (FileStream tStream = File.OpenWrite(string.Format("{0}{1}", tPath, Path.GetFileName(path))))
                        {
                            var encoder = new ImageSharp.Formats.JpegEncoder();
                            encoder.Quality = 98; // as desired
                            large.Crop(rect).Save(tStream, encoder);
                        }
                    }
                }
            }
        }
    }
}