/*
A PDF viewer plugin for ImageJ(C), using the jpedal and JAI libraries.
Copyright (C) 2005 Albert Cardona.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation (http://www.gnu.org/licenses/gpl.txt )
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 

You may contact Albert Cardona at acardona at ini phys ethz ch
*/
import ij.plugin.PlugIn;
import ij.ImagePlus;
import ij.ImageStack;
import ij.io.OpenDialog;
import ij.Menus;
import ij.IJ;
import ij.gui.GenericDialog;
import ij.process.ColorProcessor;
import org.jpedal.PdfDecoder;
import java.awt.image.BufferedImage;
import java.io.File;


public class PDF_Viewer implements PlugIn {

	int scaling = 1; // 1 is 100%
	int page = 0;
	
	public void run(String argh) {
		
		// select a file
		OpenDialog od = new OpenDialog("Select PDF file.", null);
		// check that any PDF file was selected
		String file_name = od.getFileName();
		if (null == file_name) {
			return;
		} else if (file_name.lastIndexOf(".pdf") != file_name.length() - 4) {
			IJ.showMessage("Not a PDF file!");
			return;
		}
		String dir_name = od.getDirectory();
		// ask for scale
		GenericDialog gd = new GenericDialog("Scale");
		final String[] scales = new String[]{"100","200","300","400","500","600","700", "800","900","1000"};
		gd.addChoice("Scale: ", scales, scales[0]);
		gd.addNumericField("Page (0 for all): ", 0, 0);
		gd.showDialog();
		if (gd.wasCanceled()) return;

		scaling = gd.getNextChoiceIndex() + 1;
		page = (int)gd.getNextNumber();
		if (page < 0) page = 0;

		// open the PDF
		try {
			PdfDecoder decoder = new PdfDecoder();
			decoder.setDefaultDisplayFont("SansSerif");
			decoder.setPageParameters(scaling, 1);
			decoder.openPdfFile(dir_name + File.separator + file_name);
			String msg = decoder.getPageFailureMessage();
			if (null != msg && !msg.equals("")) {
				IJ.log(msg);
			}
			int n_pages = decoder.getPageCount();
			if (0 == n_pages) {
				IJ.log("PDF file has zero pages.");
				System.gc();
				return;
			}
			if (page > n_pages) {
				IJ.showMessage("There are only " + n_pages);
				System.gc();
				return;
			}

			if (0 == page) {
				// get first page
				BufferedImage bi_first = decoder.getPageAsImage(1);
				int width = bi_first.getWidth();
				int height = bi_first.getHeight();
				msg = decoder.getPageFailureMessage();
				if (null != msg && !msg.equals("")) {
					IJ.log(msg);
				}
				if (null == bi_first) {
					IJ.showMessage("Can't read first page.");
					System.gc();
					return;
				}
				ImageStack stack = new ImageStack(width, height);
				stack.addSlice("1", new ColorProcessor(bi_first));
				bi_first.flush();
				// get rest of pages
				for (int i=2; i<=n_pages; i++) {
					BufferedImage bi = decoder.getPageAsImage(i);
					ColorProcessor cp = null;
					if (bi.getWidth() == width && bi.getHeight() == height) {
						cp = new ColorProcessor(bi);
					} else {
						ColorProcessor cp2 = new ColorProcessor(bi);
						cp2 = (ColorProcessor)cp2.resize(width, cp2.getHeight() * width / cp2.getWidth());
						cp = new ColorProcessor(width, height);
						cp.insert(cp2, 0, 0);
					}
					stack.addSlice(Integer.toString(i+1), cp);
					bi.flush();
				}
				// show stack
				ImagePlus img = new ImagePlus(file_name, stack);
				img.show();
			} else {
				BufferedImage bi = decoder.getPageAsImage(page);
				new ImagePlus(file_name, bi).show();
			}

		} catch (Exception e) {
			IJ.log("Error: " + e);
			e.printStackTrace();
		}
		
	}
}