/*
 * $Id$
 * Copyright (c) 2005-2007 Paulo Soares, Bruno Lowagie, Carsten Hammer
 *
 * 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.
 */

/*
 * This class was originally published under the MPL by Bruno Lowagie
 * Paulo Soares and Carsten Hammer.
 * It was a part of iText, a Java-PDF library. You can now use it under
 * the MIT License; for backward compatibility you can also use it under
 * the MPL version 1.1: http://www.mozilla.org/MPL/
 * A copy of the MPL license is bundled with the source code FYI.
 */

package com.lowagie.toolbox.plugins;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;

import javax.swing.JInternalFrame;

import com.lowagie.text.pdf.PRStream;
import com.lowagie.text.pdf.PdfArray;
import com.lowagie.text.pdf.PdfDictionary;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfNameTree;
import com.lowagie.text.pdf.PdfObject;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfString;
import com.lowagie.toolbox.AbstractTool;
import com.lowagie.toolbox.arguments.AbstractArgument;
import com.lowagie.toolbox.arguments.FileArgument;
import com.lowagie.toolbox.arguments.filters.PdfFilter;
import com.lowagie.toolbox.swing.PdfInformationPanel;

/**
 * This tool lets you extract the attachments of a PDF.
 * @since 2.1.1 (imported from itexttoolbox project)
 */
public class ExtractAttachments extends AbstractTool {

	static {
		addVersion("$Id$");
	}

	/**
	 * Constructs a ExtractAttachements object.
	 */
	public ExtractAttachments() {
		FileArgument f = new FileArgument(this, "srcfile",
				"The file you want to operate on", false, new PdfFilter());
		f.setLabel(new PdfInformationPanel());
		arguments.add(f);
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#createFrame()
	 */
	protected void createFrame() {
		internalFrame = new JInternalFrame("ExtractAttachments", true, false,
				true);
		internalFrame.setSize(300, 80);
		internalFrame.setJMenuBar(getMenubar());
		System.out.println("=== ExtractAttachments OPENED ===");
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#execute()
	 */
	public void execute() {
		try {
			if (getValue("srcfile") == null)
				throw new InstantiationException(
						"You need to choose a sourcefile");
			File src = (File) getValue("srcfile");

			// we create a reader for a certain document
			PdfReader reader = new PdfReader(src.getAbsolutePath());
			final File parentFile = src.getParentFile();
			final String outPath;
			if (parentFile != null) {
				outPath = parentFile.getAbsolutePath();
			} else {
				outPath = "";
			}
			PdfDictionary catalog = reader.getCatalog();
			PdfDictionary names = (PdfDictionary) PdfReader
					.getPdfObject(catalog.get(PdfName.NAMES));
			if (names != null) {
				PdfDictionary embFiles = (PdfDictionary) PdfReader
						.getPdfObject(names.get(new PdfName("EmbeddedFiles")));
				if (embFiles != null) {
				    HashMap<String, PdfObject> embMap = PdfNameTree.readTree(embFiles);
					for (Iterator<PdfObject> i = embMap.values().iterator(); i.hasNext();) {
						PdfDictionary filespec = (PdfDictionary) PdfReader
								.getPdfObject(i.next());
						unpackFile(reader, filespec, outPath);
					}
				}
			}
			for (int k = 1; k <= reader.getNumberOfPages(); ++k) {
				PdfArray annots = (PdfArray) PdfReader.getPdfObject(reader
						.getPageN(k).get(PdfName.ANNOTS));
				if (annots == null)
					continue;
				for (Iterator<PdfObject> i = annots.listIterator(); i.hasNext();) {
					PdfDictionary annot = (PdfDictionary) PdfReader
							.getPdfObject(i.next());
					PdfName subType = (PdfName) PdfReader.getPdfObject(annot
							.get(PdfName.SUBTYPE));
					if (!PdfName.FILEATTACHMENT.equals(subType))
						continue;
					PdfDictionary filespec = (PdfDictionary) PdfReader
							.getPdfObject(annot.get(PdfName.FS));
					unpackFile(reader, filespec, outPath);
				}
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument)
     * @param arg StringArgument
     */
    public void valueHasChanged(AbstractArgument arg) {
		if (internalFrame == null) {
			// if the internal frame is null, the tool was called from the
			// command line
			return;
		}
		// represent the changes of the argument in the internal frame
	}

    /**
     * Extract the attachments of a PDF.
     *
     * @param args String[]
     */
    public static void main(String[] args) {
		ExtractAttachments tool = new ExtractAttachments();
		if (args.length < 1) {
			System.err.println(tool.getUsage());
		}
		tool.setMainArguments(args);
		tool.execute();
	}

    /**
     *
     * @see com.lowagie.toolbox.AbstractTool#getDestPathPDF()
     * @throws InstantiationException
     * @return File
     */
    protected File getDestPathPDF() throws InstantiationException {
		throw new InstantiationException("There is more than one destfile.");
	}

	/**
	 * Unpacks a file attachment.
	 *
	 * @param reader
	 *            The object that reads the PDF document
	 * @param filespec
	 *            The dictionary containing the file specifications
	 * @param outPath
	 *            The path where the attachment has to be written
	 * @throws IOException
	 */
	public static void unpackFile(PdfReader reader, PdfDictionary filespec,
			String outPath) throws IOException {
		if (filespec == null)
			return;
		PdfName type = (PdfName) PdfReader.getPdfObject(filespec
				.get(PdfName.TYPE));
		if (!PdfName.F.equals(type) && !PdfName.FILESPEC.equals(type))
			return;
		PdfDictionary ef = (PdfDictionary) PdfReader.getPdfObject(filespec
				.get(PdfName.EF));
		if (ef == null)
			return;
		PdfString fn = (PdfString) PdfReader.getPdfObject(filespec
				.get(PdfName.F));
		System.out.println("Unpacking file '" + fn + "' to " + outPath);
		if (fn == null)
			return;
		File fLast = new File(fn.toUnicodeString());
		File fullPath = new File(outPath, fLast.getName());
		if (fullPath.exists())
			return;
		PRStream prs = (PRStream) PdfReader.getPdfObject(ef.get(PdfName.F));
		if (prs == null)
			return;
		byte b[] = PdfReader.getStreamBytes(prs);
		FileOutputStream fout = new FileOutputStream(fullPath);
		fout.write(b);
		fout.close();
	}

}
