using System;
using System.IO;
using System.Linq;

using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Xobject;
using iText.Layout;
using iText.Layout.Element;

using java.util;
using org.apache.pdfbox.pdmodel.graphics.xobject;
using org.apache.pdfbox.pdmodel;

namespace ComicCompressor
{
    public class ImageExtractor7
    {
        public static readonly String DEST = "K:\\_COMIX\\_TOOLS_\\comic-compress-master\\bin\\Debug\\net6.0\\_NEW_PDF_\\Fan SUP 18.cbz";

        public static readonly String SRC = "K:\\_COMIX\\_TOOLS_\\comic-compress-master\\bin\\Debug\\net6.0\\_PDF_\\Fan SUP 18.pdf";

        public static void Main7()
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new ImageExtractor7().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument resultDoc = new PdfDocument(new PdfWriter(dest));
            PdfDocument srcDoc = new PdfDocument(new PdfReader(SRC));

            // Assume that there is a single XObject in the source document
            // and this single object is an image.
            PdfDictionary pageDict = srcDoc.GetFirstPage().GetPdfObject();
            PdfDictionary pageResources = pageDict.GetAsDictionary(PdfName.Resources);
            PdfDictionary pageXObjects = pageResources.GetAsDictionary(PdfName.XObject);
            var ks = pageXObjects.KeySet();
            PdfName imgRef = pageXObjects.KeySet().First();
            PdfStream imgStream = pageXObjects.GetAsStream(imgRef);
            PdfImageXObject imgObject = new PdfImageXObject((PdfStream)imgStream.CopyTo(resultDoc));
            Image image = new Image(imgObject);
            image.ScaleToFit(14400, 14400);
            image.SetFixedPosition(0, 0);
            

            srcDoc.Close();

            PageSize pageSize = new PageSize(image.GetImageScaledWidth(), image.GetImageScaledHeight());
            Document doc = new Document(resultDoc, pageSize);
            doc.Add(image);

            doc.Close();
        }


        public static void MainBox()
        {
            new ImageExtractor7().ManipulatePdf(DEST);
        }

        protected void ManipulatePdfBox(String dest)
        {
            PDDocument document = null;
            document = PDDocument.load(SRC);
            java.util.List pages = document.getDocumentCatalog().getAllPages();
            Iterator iter = pages.iterator();
            while (iter.hasNext())
            {
                PDPage page = (PDPage)iter.next();
                PDResources resources = page.getResources();
                Map pageImages = resources.getImages();
                if (pageImages != null)
                {
                    Iterator imageIter = pageImages.keySet().iterator();
                    while (imageIter.hasNext())
                    {
                        String key = (String)imageIter.next();
                        PDXObjectImage image = (PDXObjectImage)pageImages.get(key);
                        //image.write2OutputStream(/* some output stream */);
                    }
                }
            }
        }
    }
}