/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: PDFUtilities.java,v 1.3 2006/10/31 08:09:33 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdf;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.util.List;

import at.gv.egiz.pdfas.framework.input.PdfDataSource;
import at.gv.egiz.pdfas.impl.input.ByteArrayPdfDataSourceImpl;

import org.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDPage;

import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;

import com.lowagie.text.DocumentException;

/**
 * Contains useful helpers for accessing PDF documents.
 * 
 * @author wprinz
 * @author mruhmer
 */
public abstract class PDFUtilities
{
	  public static float calculatePageLength(final PdfDataSource pdfDataSource,int page ,float footer_line,  int pagerotation) throws PDFDocumentException
	  {
	    try
	    {
	      //ByteArrayInputStream original_bais = new ByteArrayInputStream(pdf);
	      //byte [] normalized_pdf = TextualSignature.normalizePDF(original_bais);
	      byte [] normalized_pdf = TextualSignature.normalizePDF(pdfDataSource);
	      
	      // PERF: The whole PDF normalization process is costy
	      ByteArrayInputStream bais = new ByteArrayInputStream(normalized_pdf);

	      PDFParser parser = new PDFParser(bais);
	      File temporary_dir = SettingsReader.getTemporaryDirectory();
	      parser.setTempDirectory(temporary_dir);
	      parser.parse();

	      PDDocument pdfDocument_ = parser.getPDDocument();
	      float page_length = calculatePageLength(pdfDocument_,page , footer_line, pagerotation);
	      pdfDocument_.close();
	      return page_length;
	    }
	    catch (IOException e)
	    {
	      throw new PDFDocumentException(201, e);
	    }
	    catch (DocumentException e)
	    {
	      throw new PDFDocumentException(201, e);
	    }
	  }	
	  public static float calculatePageLength(PDDocument document,int page ,float footer_line, int pagerotation) throws IOException
	  {
	    //int last_page_id = document.getNumberOfPages();
	    List allPages = document.getDocumentCatalog().getAllPages();
	    PDPage pdpage = (PDPage) allPages.get(page);
	    pdpage.setRotation(pagerotation);
	    return calculatePageLength(pdpage, footer_line);
	  }	
	
	  /**
	   * @deprecated
	   * @param pdf
	   * @param footer_line
	   * @return
	   * @throws PDFDocumentException
	   */
  public static float calculateLastPageLength(final byte[] pdf, float footer_line) throws PDFDocumentException
  {
    try
    {
      //ByteArrayInputStream original_bais = new ByteArrayInputStream(pdf);
      PdfDataSource dataSource = new ByteArrayPdfDataSourceImpl(pdf);
      byte [] normalized_pdf = TextualSignature.normalizePDF(dataSource);
      
      ByteArrayInputStream bais = new ByteArrayInputStream(normalized_pdf);

      PDFParser parser = new PDFParser(bais);
      File temporary_dir = SettingsReader.getTemporaryDirectory();
      parser.setTempDirectory(temporary_dir);
      parser.parse();

      PDDocument pdfDocument_ = parser.getPDDocument();
      float last_page_length = calculateLastPageLength(pdfDocument_, footer_line);
      pdfDocument_.close();

      return last_page_length;
    }
    catch (IOException e)
    {
      throw new PDFDocumentException(201, e);
    }
    catch (DocumentException e)
    {
      throw new PDFDocumentException(201, e);
    }
  }

  public static float calculateLastPageLength(PDDocument document, float footer_line) throws IOException
  {
    int last_page_id = document.getNumberOfPages();
    List allPages = document.getDocumentCatalog().getAllPages();
    PDPage last_page = (PDPage) allPages.get(last_page_id - 1);

    return calculatePageLength(last_page, footer_line);
  }

  public static float calculatePageLength(PDPage page, float footer_line) throws IOException
  {
    // logger_.debug("Last Page id:" + last_page_id);
    // PDPage last_page = (PDPage) allPages.get(0);
    PDFPage my_page = new PDFPage(footer_line);
    my_page.processStream(page, page.findResources(), page.getContents().getStream());
    return my_page.getMaxPageLength();
  }

}