/**
 * <copyright> Copyright (c) 2006 by Know-Center, Graz, Austria </copyright>
 * 
 * This software is the confidential and proprietary information of Know-Center,
 * Graz, Austria. You shall not disclose such Confidential Information and shall
 * use it only in accordance with the terms of the license agreement you entered
 * into with Know-Center.
 * 
 * KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES.
 * 
 * $Id: TextualSignator_1_0_0.java,v 1.3 2006/10/31 08:07:50 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.framework.signators;

import com.lowagie.text.pdf.PdfPTable;

import at.knowcenter.wag.egov.egiz.PdfAS;
import at.knowcenter.wag.egov.egiz.PdfASID;
import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.framework.SignResult;
import at.knowcenter.wag.egov.egiz.framework.Signator;
import at.knowcenter.wag.egov.egiz.framework.SignatorFactory;
import at.knowcenter.wag.egov.egiz.pdf.BinarySignature;
import at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation;
import at.knowcenter.wag.egov.egiz.pdf.TablePos;
import at.knowcenter.wag.egov.egiz.sig.SignatureTypes;

/**
 * Signs a document textually.
 * 
 * <p>
 * In prepareSign, the document text is extracted and normalized.
 * </p>
 * <p>
 * In finishSign, the signed SignatureObject is transformed into a Signature
 * block, which is then written as an Incremental Update.
 * </p>
 * 
 * @author wprinz
 */
public class TextualSignator_1_0_0 implements Signator
{
  /**
   * The Pdf-AS ID of this Signator.
   */
  public static final PdfASID MY_ID = new PdfASID(SignatorFactory.VENDOR, SignatorFactory.TYPE_TEXTUAL, SignatorFactory.VERSION_1_0_0);

  /**
   * Default constructor.
   */
  public TextualSignator_1_0_0()
  {
    // Default constructor.
  }

  /**
   * <p>
   * The parameter has_SIG_ID is not used by this Signator because it doesn't
   * pre-format the signature block.
   * </p>
   * 
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#prepareSign(byte[],
   *      String, TablePos, boolean)
   */
  public IncrementalUpdateInformation prepareSign(byte[] pdf,
      String signature_type, TablePos pos, boolean has_SIG_ID) throws PresentableException
  {
    IncrementalUpdateInformation iui = new IncrementalUpdateInformation();
    iui.original_document = pdf;
    iui.signature_type = signature_type;
    iui.pos = pos;

    iui.document_text = PdfAS.extractNormalizedTextTextual(pdf);
    // logger_.debug("signed_text = " + document_text);

    return iui;
  }

  /**
   * @see at.knowcenter.wag.egov.egiz.framework.Signator#finishSign(at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation)
   */
  public SignResult finishSign(IncrementalUpdateInformation iui) throws PresentableException
  {
    // PdfAS.prefixID(iui.signed_signature_object, PdfAS.TEXT_ID);

    iui.signed_signature_object.setKZ(MY_ID);

    PdfPTable pdf_table = PdfAS.createPdfPTableFromSignatureObject(iui.signed_signature_object);

    if (iui.pos == null)
    {
      String pos_string = SettingsReader.getInstance().getSetting(SignatureTypes.SIG_OBJ + iui.signature_type + ".pos", null);
      if (pos_string != null)
      {
        iui.pos = PdfAS.parsePositionFromPosString(pos_string);
        pdf_table.setTotalWidth(iui.pos.width);
        pdf_table.setLockedWidth(true);
      }
      else
      {
        iui.pos = PdfAS.adjustTableAndCalculatePosition(iui.original_document, pdf_table);
      }
    }
    else
    {
      pdf_table.setTotalWidth(iui.pos.width);
      pdf_table.setLockedWidth(true);
    }

    IncrementalUpdateInformation signed_iui = BinarySignature.writeIncrementalUpdate(iui.original_document, pdf_table, iui.pos, null, null);

    SignResult sign_result = new SignResult(PdfAS.PDF_MIME_TYPE, signed_iui.signed_pdf);
    return sign_result;
  }

}