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/*
 * $Id: Split.java 3271 2008-04-18 20:39:42Z xlv $
 * Copyright (c) 2005-2007 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
 * 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 javax.swing.JInternalFrame;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.toolbox.AbstractTool;
import com.lowagie.toolbox.arguments.AbstractArgument;
import com.lowagie.toolbox.arguments.FileArgument;
import com.lowagie.toolbox.arguments.IntegerArgument;
import com.lowagie.toolbox.arguments.filters.PdfFilter;
import com.lowagie.toolbox.swing.PdfInformationPanel;

/**
 * This tool lets you split a PDF in two separate PDF files.
 * @since 2.1.1 (imported from itexttoolbox project)
 */
public class Split extends AbstractTool {

	static {
		addVersion("$Id: Split.java 3271 2008-04-18 20:39:42Z xlv $");
	}
	/**
	 * Constructs an Split object.
	 */
	public Split() {
		FileArgument f = new FileArgument(this, "srcfile", "The file you want to split", false, new PdfFilter());
		f.setLabel(new PdfInformationPanel());
		arguments.add(f);
		arguments.add(new FileArgument(this, "destfile1", "The file to which the first part of the original PDF has to be written", true, new PdfFilter()));
		arguments.add(new FileArgument(this, "destfile2", "The file to which the second part of the original PDF has to be written", true, new PdfFilter()));
		arguments.add(new IntegerArgument(this, "pagenumber", "The pagenumber where you want to split"));
	}

	/**
	 * @see com.lowagie.toolbox.AbstractTool#createFrame()
	 */
	protected void createFrame() {
		internalFrame = new JInternalFrame("Split", true, false, true);
		internalFrame.setSize(300, 80);
		internalFrame.setJMenuBar(getMenubar());
		System.out.println("=== Split 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");
        	if (getValue("destfile1") == null) throw new InstantiationException("You need to choose a destination file for the first part of the PDF");
        	File file1 = (File)getValue("destfile1");
        	if (getValue("destfile2") == null) throw new InstantiationException("You need to choose a destination file for the second part of the PDF");
        	File file2 = (File)getValue("destfile2");
        	int pagenumber = Integer.parseInt((String)getValue("pagenumber"));

        	// we create a reader for a certain document
			PdfReader reader = new PdfReader(src.getAbsolutePath());
			// we retrieve the total number of pages
			int n = reader.getNumberOfPages();
			System.out.println("There are " + n + " pages in the original file.");

			if (pagenumber < 2 || pagenumber > n) {
				throw new DocumentException("You can't split this document at page " + pagenumber + "; there is no such page.");
			}

			// step 1: creation of a document-object
			Document document1 = new Document(reader.getPageSizeWithRotation(1));
			Document document2 = new Document(reader.getPageSizeWithRotation(pagenumber));
			// step 2: we create a writer that listens to the document
			PdfWriter writer1 = PdfWriter.getInstance(document1, new FileOutputStream(file1));
			PdfWriter writer2 = PdfWriter.getInstance(document2, new FileOutputStream(file2));
			// step 3: we open the document
			document1.open();
			PdfContentByte cb1 = writer1.getDirectContent();
			document2.open();
			PdfContentByte cb2 = writer2.getDirectContent();
			PdfImportedPage page;
			int rotation;
			int i = 0;
			// step 4: we add content
			while (i < pagenumber - 1) {
				i++;
				document1.setPageSize(reader.getPageSizeWithRotation(i));
				document1.newPage();
				page = writer1.getImportedPage(reader, i);
				rotation = reader.getPageRotation(i);
				if (rotation == 90 || rotation == 270) {
					cb1.addTemplate(page, 0, -1f, 1f, 0, 0, reader.getPageSizeWithRotation(i).getHeight());
				}
				else {
					cb1.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
				}
			}
			while (i < n) {
				i++;
				document2.setPageSize(reader.getPageSizeWithRotation(i));
				document2.newPage();
				page = writer2.getImportedPage(reader, i);
				rotation = reader.getPageRotation(i);
				if (rotation == 90 || rotation == 270) {
					cb2.addTemplate(page, 0, -1f, 1f, 0, 0, reader.getPageSizeWithRotation(i).getHeight());
				}
				else {
					cb2.addTemplate(page, 1f, 0, 0, 1f, 0, 0);
				}
			}
			// step 5: we close the document
			document1.close();
			document2.close();
        }
        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
	}


    /**
     * Split a PDF in two separate PDF files.
     *
     * @param args String[]
     */
    public static void main(String[] args) {
    	Split tool = new Split();
    	if (args.length < 4) {
    		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 {
		return (File)getValue("destfile1");
	}
}