using HiComponents.IEvolution;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static HiComponents.IEvolution.IOParams;
using static System.Net.Mime.MediaTypeNames;

namespace IEvolution_gray_tif_fails
{
    internal class Program
    {

        const string sourceDir = @"C:\Laufwerk_d\Net\IEmagen_grayscaletiff_error\IEvolution gray_tif_fails\SourceFiles\";
        static void Main(string[] args)
        {
            string targetTiff = GetAppPath + "multipage.tif";
            string pageFile = sourceDir + "Document_0001_page_{0}.png";//0001
            int ip = 1;
            //color & compression:
            //TIFF grayScale:
            int bps = 16;
            int spp = 1;
            var ieCompression = HiComponents.IEvolution.IOParams.TIFFCompression.ZIP;
            //create container for tiff:
            var ieMulti = new HiComponents.IEvolution.IEMulti();
            //start
            string currentFile = string.Format(pageFile, AddLeadingZeros(ip.ToString()));
            while (System.IO.File.Exists(currentFile))
            {
                //add image:
                using (IEViewer ieViewer = new IEViewer())
                {
                    ieViewer.Image.LoadImage(GetPdfMemoryStream(currentFile));
                    ieViewer.Image.ConvertToGray();
                    ieMulti.ImageList.AppendImage(ieViewer.Image);
                }
                //add to container:
                //next:
                ip++;
                currentFile = string.Format(pageFile, AddLeadingZeros(ip.ToString()));
                //free mem
                FreeMem();
            }
            Console.WriteLine("converting to tiff:");
            //set outputformat
            for (int i = 0; i < ieMulti.ImageList.ImageCount; i++)
            {
                //dpi
                ieMulti.ImageList.GetIOParams(i).DpiX = 300;
                ieMulti.ImageList.GetIOParams(i).DpiY = 300;
                //other
                ieMulti.ImageList.GetIOParams(i).TIFF_Compression = ieCompression;
                ieMulti.ImageList.GetIOParams(i).BitsPerSample = bps;
                ieMulti.ImageList.GetIOParams(i).SamplesPerPixel = spp;
                //ie16g
                ieMulti.ImageList.GetIOParams(i).TIFF_ZIPCompression = HiComponents.IEvolution.IOParams.TIFFZIPCompression.Max;
            }
            //save:
            ieMulti.ImageList.SaveImages(targetTiff);
            //free mem:
            ieMulti?.Dispose();
            ieMulti = null;
        }

        static void FreeMem()
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
        }

        static MemoryStream GetPdfMemoryStream(string fullFilename)
        {
            MemoryStream ms = new MemoryStream();
            using (FileStream file = new FileStream(fullFilename, FileMode.Open, FileAccess.Read))
            {
                byte[] bytes = new byte[file.Length];
                file.Read(bytes, 0, (int)file.Length);
                ms.Write(bytes, 0, (int)file.Length);
            }
            ms.Position = 0;
            return ms;
        }

        static string AddLeadingZeros(string input, int lenght = 4)
        {
            return input.PadLeft(4, '0');
        }

        static string GetAppPath
        {
            get
            {
                string functionReturnValue = string.Empty;
                functionReturnValue = AppDomain.CurrentDomain.BaseDirectory;
                if (!functionReturnValue.EndsWith("\\")) functionReturnValue += "\\";
                return functionReturnValue;
            }
        }
    }
}

        static void Test2(string targetTiff)
        {
            List<string> tempFiles = new List<string>();
            try
            {
                /*
                 Bilder vorbereiten und als Tiff-Einzelbild speichern
                Mergen via
                   InsertTIFFImageFile
              */
                string pageFile = sourceDir + "Document_0001_page_{0}.png";//0001
                                                                           //color & compression:
                                                                           //TIFF grayScale:
                /*Parameters
                 * sourceFileName The source file name
                 * insertingFileName The file to insert
                 * outFileName The destination file name
                 * index index is the page where to insert the file.
                 */
                //create container for tiff:
                //IEImage.InsertTIFFImageFile(last,imageToInsert,newLast,index) 

                //start
                int ip = 1;
                string currentFile = string.Format(pageFile, AddLeadingZeros(ip.ToString()));
                string tempFile = string.Empty;
                Kill(targetTiff);
                string targetTiff_new = targetTiff + ".tiff";
                while (System.IO.File.Exists(currentFile))
                {
                    if (!System.IO.File.Exists(targetTiff))
                    {
                        SaveAsTiff(currentFile, targetTiff);
#if DEBUG
                        //string input1 = string.Format(pageFile, AddLeadingZeros("1"));
                        //string input2 = string.Format(pageFile, AddLeadingZeros("2"));
                        //string input3 = string.Format(pageFile, AddLeadingZeros("3"));
                        //string input1Tiff = GetAppPath + "input_1" + ".tiff";
                        //string input2Tiff = GetAppPath + "input_2" + ".tiff";
                        //string input3Tiff = GetAppPath + "input_3" + ".tiff";
                        //string outtif = GetAppPath + "1-2.tiff";
                        //Kill(input1Tiff);
                        //Kill(input2Tiff);
                        //Kill(input3Tiff);
                        //Kill(outtif);
                        //SaveAsTiff(input1, input1Tiff);
                        //SaveAsTiff(input2, input2Tiff);
                        //SaveAsTiff(input3, input3Tiff);
                        //IEImage.InsertTIFFImageFile(input2Tiff, input1Tiff, outtif, 0);
                        ////Seite 3 anfügen:
                        //string outtif_old= GetAppPath + "1-2.tiff";
                        //outtif = GetAppPath + "1-3.tiff";
                        //IEImage.InsertTIFFImageFile(input3Tiff, outtif_old, outtif, 0);
                        //Console.WriteLine("test");
#endif
                    }
                    else
                    {
                        tempFile = GetAppPath + "tmp.tif";// System.IO.Path.GetTempFileName();
                        tempFiles.Add(tempFile);
                        //add image:
                        SaveAsTiff(currentFile, tempFile);
                        //add to container:
                        //    IEImage.InsertTIFFImageFile(input2Tiff, input1Tiff, outtif, 0);
                        IEImage.InsertTIFFImageFile(tempFile,targetTiff, targetTiff_new, 0);
                        Kill(targetTiff);
                        System.IO.File.Move(targetTiff_new, targetTiff);
                    }
                    //next:
                    ip++;
                    currentFile = string.Format(pageFile, AddLeadingZeros(ip.ToString()));
                    //free mem
                    FreeMem();
                }
            }
            finally
            {
                foreach (string tmpFile in tempFiles)
                    Kill(tmpFile);
            }
        }

        static void SaveAsTiff(string source, string target)
        {
            using (IEViewer ieViewer = new IEViewer())
            {
                ieViewer.Image.LoadImage(GetPdfMemoryStream(source));
                ieViewer.Image.ConvertToGray();
                SetCompression(ieViewer.Image);
                ieViewer.Image.SaveImage(target);
            }
        }

        static void Kill(string fullfilename)
        {
            try
            {
                if (System.IO.File.Exists(fullfilename))
                    System.IO.File.Delete(fullfilename);
            }
            catch {/*by design */}
        }