/**
 * <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: PDFSignatureObjectIText.java,v 1.5 2006/10/31 08:09:33 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdf;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import at.gv.egiz.pdfas.exceptions.ErrorCode;
import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;
import at.knowcenter.wag.egov.egiz.sig.SignatureObject;
import at.knowcenter.wag.egov.egiz.table.Entry;
import at.knowcenter.wag.egov.egiz.table.Style;
import at.knowcenter.wag.egov.egiz.table.Table;

import com.lowagie.text.BadElementException;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.Image;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.SubsetLocal;

/**
 * This class is the IText implementation of the PDFSignatureObject interface.
 * The class takes an abstract definition of a signature object and convert them
 * into a pdf table that is used to sign a pdf document.
 * 
 * @author wlackner
 * @see at.knowcenter.wag.egov.egiz.sig.SignatureObject
 * @see at.knowcenter.wag.egov.egiz.table.Table
 * @see at.knowcenter.wag.egov.egiz.table.Entry
 * @see at.knowcenter.wag.egov.egiz.table.Style
 * @see com.lowagie.text.pdf.PdfPTable
 * @see at.knowcenter.wag.egov.egiz.cfg.SettingsReader
 */
public class PDFSignatureObjectIText implements PDFSignatureObject
{

// 03.11.2010 changed by exthex to allow setting separate hAlign and vAlign for value and non-value cells.
// If no value for valuevalign or valuehalign is set the values from valign and halign are taken.
// Also fixed a minor bug which prevented proper style inheritment (Bug Nr. #534).
// 04.11.2010 changed by exthex - allow setting separate hAlign and vAlign for image cells analog to value cells.

  private static final String SIG_PDFA1_B_VALID = "SIG_PDFA1B_VALID";

/**
   * The default font definition
   */
  private static Font DEFAULT_FONT = new Font(Font.HELVETICA, 8, Font.NORMAL);

  /**
   * The abstract signature object
   */
  private SignatureObject sigObject_ = null;

  /**
   * The IText pdf table object
   */
  private PdfPTable pdfSigObject_ = null;

  /**
   * The SettingsReader instance
   */
  private SettingsReader settings_ = null;

  /**
   * The logger definition.
   */
  private static final Logger logger_ = ConfigLogger.getLogger(PDFSignatureObjectIText.class);

  /**
   * Map the style align definitions to IText's align statements
   */
  private static HashMap alignMap_ = new HashMap();

  /**
   * Map the font definitions to IText's font statements
   */
  private static HashMap fontMap_ = new HashMap();

  /**
   * The empty constructor. It loads the ui definitions from signature tables
   * and init the align map.
   * 
   * @throws PDFDocumentException
   */
  public PDFSignatureObjectIText() throws PDFDocumentException
  {
    loadSettings();
    initStyleMaps();
  }

  /**
   * load the class settings
   * 
   * @throws PDFDocumentException
   * @see SettingsReader
   */
  private void loadSettings() throws PDFDocumentException
  {
    if (settings_ == null)
    {
      try
      {
        settings_ = SettingsReader.getInstance();
      }
      catch (SettingsException e)
      {
        String log_message = "Can not load pdf signature settings. Cause:\n" + e.getMessage();
        logger_.error(log_message);
        throw new PDFDocumentException(101, log_message, e);
      }
    }
  }

  /**
   * This method initialize the style maps. It maps the style style definitions
   * to IText styles.
   */
  private void initStyleMaps()
  {
    alignMap_.put(Style.TOP, new Integer(Element.ALIGN_TOP));
    alignMap_.put(Style.MIDDLE, new Integer(Element.ALIGN_MIDDLE));
    alignMap_.put(Style.BOTTOM, new Integer(Element.ALIGN_BOTTOM));
    alignMap_.put(Style.LEFT, new Integer(Element.ALIGN_LEFT));
    alignMap_.put(Style.CENTER, new Integer(Element.ALIGN_CENTER));
    alignMap_.put(Style.RIGHT, new Integer(Element.ALIGN_RIGHT));

    fontMap_.put(Style.HELVETICA, new Integer(Font.HELVETICA));
    fontMap_.put(Style.TIMES_ROMAN, new Integer(Font.TIMES_ROMAN));
    fontMap_.put(Style.COURIER, new Integer(Font.COURIER));
    fontMap_.put(Style.NORMAL, new Integer(Font.NORMAL));
    fontMap_.put(Style.BOLD, new Integer(Font.BOLD));
    fontMap_.put(Style.ITALIC, new Integer(Font.ITALIC));
    fontMap_.put(Style.BOLDITALIC, new Integer(Font.BOLDITALIC));
    fontMap_.put(Style.UNDERLINE, new Integer(Font.UNDERLINE));
    fontMap_.put(Style.STRIKETHRU, new Integer(Font.STRIKETHRU));
  }

  /**
   * Set the abstract signature definition.
   * 
   * @param signatorObject
   *          the abstract signator object
   * @see at.knowcenter.wag.egov.egiz.pdf.PDFSignatureObject#setSignatorObject(at.knowcenter.wag.egov.egiz.sig.SignatureObject)
   */
  public void setSignatorObject(SignatureObject signatorObject)
  {
    sigObject_ = signatorObject;
  }

  /**
   * This method maps the table cell definitions to the pdfCell element.
   * 
   * @param pdfCell
   *          the pdf cell to be styled
   * @param cellStyle
   *          the abstract style definition
   * @param type
   *          type of the cell to render - the appropriate style will be set
   * @see com.lowagie.text.pdf.PdfPCell
   * @see at.knowcenter.wag.egov.egiz.table.Style
   */
  private void setCellStyle(PdfPCell pdfCell, Style cellStyle, int type)
  {
    if (cellStyle != null)
    {
      if (cellStyle.getBgColor() != null)
      {
        pdfCell.setBackgroundColor(cellStyle.getBgColor());
      }
      pdfCell.setPadding(cellStyle.getPadding());
      //exthex - fix for not exactly vertically centered text
      pdfCell.setUseAscender(true);

      if (cellStyle.getBorder() > 0)
      {
        pdfCell.setBorderWidth(cellStyle.getBorder());
      }
      else
      {
        pdfCell.setBorder(0);
      }
      int align = -1;
      if (type == Entry.TYPE_VALUE && cellStyle.getValueVAlign() != null)
   	    align = ((Integer) alignMap_.get(cellStyle.getValueVAlign())).intValue();
      //Note: to change the default valign of images to those of values, change the if construct below
      else if (type == Entry.TYPE_IMAGE && cellStyle.getImageVAlign() != null)
        align = ((Integer) alignMap_.get(cellStyle.getImageVAlign())).intValue();
      else if (cellStyle.getVAlign() != null)
        align = ((Integer) alignMap_.get(cellStyle.getVAlign())).intValue();
      if (align != -1)
        pdfCell.setVerticalAlignment(align);
      
      align = -1;
      if (type == Entry.TYPE_VALUE && cellStyle.getValueHAlign() != null)
        align = ((Integer) alignMap_.get(cellStyle.getValueHAlign())).intValue();
      //Note: to change the default halign of images to those of values, change the if construct below
      else if (type == Entry.TYPE_IMAGE && cellStyle.getImageHAlign() != null)
          align = ((Integer) alignMap_.get(cellStyle.getImageHAlign())).intValue();
      else if (cellStyle.getHAlign() != null)
        align = ((Integer) alignMap_.get(cellStyle.getHAlign())).intValue();
      if (align != -1)
        pdfCell.setHorizontalAlignment(align);
    }
  }

  /**
   * This method maps the cell font definition to the iText Font Object
   * 
   * @param fontString
   * @return the corresponding iText Font Object
   * @see com.lowagie.text.Font
   */
  private Font getCellFont(String fontString)
  {
    Font font = DEFAULT_FONT;
    if (fontString == null)
    {
      return font;
    }
    Object cache_font = fontMap_.get(fontString);
    if (cache_font != null)
    {
      return (Font) cache_font;
    }
    String[] font_arr = fontString.split(",");
    if (font_arr.length != 3)
    {
      return font;
    }
    Object font_face = fontMap_.get(font_arr[0]);
    if (font_face == null)
    {
      return font;
    }
    Object font_weight = fontMap_.get(font_arr[2]);
    if (font_weight == null)
    {
      return font;
    }
    int face = ((Integer) font_face).intValue();
    float height = Float.parseFloat(font_arr[1]);
    int weight = ((Integer) font_weight).intValue();
    
    font = new Font(face, height, weight);
    fontMap_.put(fontString, font);
    return font;
  }
  
  /**
   * Creates a custom
   * @param fontString
   * @return
   * @throws PDFDocumentException
   */
  private Font getCellTrueTypeFont(String fontString) throws PDFDocumentException {
     float fontSize=8;
     String fontName = fontString.replaceFirst("TTF:", "");
     String[] split = fontName.split(",");
     if(split.length>1)
     {
    	 fontName = split[0].trim();
    	 try
    	 {
      	    fontSize = Float.parseFloat(split[1].trim());
    	 }catch (NumberFormatException e)
    	 {
    		logger_.error("Unable to parse fontsize:"+fontString);
    	 }
     }
     logger_.debug("TrueType Font detected:"+fontName +" ("+fontSize+")");
     
     try {
        Font font = (Font) fontMap_.get(fontString);
        
        if (font == null) {
           logger_.debug("Font \"" + fontString + "\" not in cache. Instantiating font.");
           String fontPath = SettingsReader.RESOURCES_PATH + "fonts" + File.separator + fontName;
           logger_.debug("Instantiating \"" + fontPath + "\".");
          
           font = new Font(BaseFont.createFont(fontPath, BaseFont.WINANSI, true), fontSize);
           fontMap_.put(fontString, font);
        }
        return font;
     } catch (DocumentException e) {
        throw new PDFDocumentException(ErrorCode.FONT_NOT_FOUND, e.getMessage());
     } catch (IOException e) {
        throw new PDFDocumentException(ErrorCode.FONT_NOT_FOUND, e.getMessage());
     }
  }

  /**
   * This method visualize an abstract table cell into a corresponding pdf table
   * cell. The new pdf table cell is redered and get the style information from
   * the abstract cell. Following types can be rendered:
   * <ul>
   * <li>text statements</li>
   * <li>images</li>
   * <li>tables</li>
   * </ul>
   * 
   * @param abstractCell
   *          the abstract cell definition
   * @return the new redererd pdf table cell
   * @throws PDFDocumentException
   *           ErrorCode:220, 221, 222
   * @see com.lowagie.text.pdf.PdfPCell
   * @see at.knowcenter.wag.egov.egiz.table.Entry
   */
  private PdfPCell renderCell(Entry abstractCell) throws PDFDocumentException
  {
	  boolean pdfaValid =false;
	  try 
	  {
		String profileid = sigObject_.getSignatureTypeDefinition().getType();
		String pdfa = SettingsReader.getInstance().getSetting("sig_obj." +profileid+".key."+SIG_PDFA1_B_VALID, "default."+SIG_PDFA1_B_VALID, "false");
        pdfaValid= "true".equalsIgnoreCase(pdfa);

// exthex test
		//SubsetLocal.set(!pdfaValid);
        
//      boolean forceSubset = true; // get this from config, default to false
      //String 
		
		//SubsetLocal.set(true); // exthex
		
        logger_.trace("Sign PDF/A compliant:"+pdfa);
	  } catch (SettingsException e1) 
	  {
		  logger_.error(e1);
	  }
	  
    PdfPCell pdf_cell = null;
    Style cell_style = abstractCell.getStyle();
    boolean isValue = true;
    switch (abstractCell.getType())
    {
    case Entry.TYPE_CAPTION:
      isValue = false;
    case Entry.TYPE_VALUE:
      String text = (String) abstractCell.getValue();
      if (text == null)
      {
        text = "";
      }
      String font_string = cell_style.getFont();
      if (abstractCell.getType() == Entry.TYPE_VALUE && cell_style.getValueFont() != null)
      {
        font_string = cell_style.getValueFont();
      }
      
  	  logger_.trace("using cell font: "+font_string);

      Font cell_font;
      if(font_string.startsWith("TTF:"))
      {
       cell_font = getCellTrueTypeFont(font_string);
      }
      else
      {
    	  if (pdfaValid) {
    	     throw new PDFDocumentException(ErrorCode.NO_EMBEDABLE_TTF_CONFIGURED_FOR_PDFA, "PDF/A modus requires an embedable true type font");
    	  }
    	cell_font = getCellFont(font_string);

      }
      // exthex
      if (pdfaValid && abstractCell.getType() == Entry.TYPE_VALUE) {
        SubsetLocal.addNonSubsetFont(cell_font.getBaseFont());    
      }
      Phrase text_phrase = new Phrase(text, cell_font);
      pdf_cell = new PdfPCell(text_phrase);
      setCellStyle(pdf_cell, cell_style, (isValue?Entry.TYPE_VALUE:Entry.TYPE_CAPTION));
      break;
    case Entry.TYPE_IMAGE:
      try
      {
        String img_ref = (String) abstractCell.getValue();
        // fixed by tknall start
        File img_file = new File(img_ref);
        if (!img_file.isAbsolute()) {
      	  logger_.debug("Image file declaration is relative. Prepending path of resources directory.");
      	  img_file = new File(SettingsReader.relocateFile(img_ref));
        } else {
      	  logger_.debug("Image file declaration is absolute. Skipping file relocation.");      	  
        }
//        String img_location = SettingsReader.relocateFile(img_ref);
//        File img_file = new File (img_location);
        if (!img_file.exists())
        {
          logger_.debug("Image file \"" + img_file.getCanonicalPath() + "\" doesn't exist.");
          throw new PDFDocumentException(220, "Image file \"" + img_file.getCanonicalPath() + "\" doesn't exist.");
        }
        Image image = Image.getInstance(img_file.getCanonicalPath());
        logger_.debug("Using image file \"" + img_file.getCanonicalPath() + "\".");
        
        image.scaleToFit(80.0f, 80.0f);
        boolean fit = true; 
        Style.ImageScaleToFit istf = cell_style.getImageScaleToFit();
        if (istf != null)
        {
          image.scaleToFit(istf.getWidth(), istf.getHeight());
          fit = false;
        }
        pdf_cell = new PdfPCell(image, fit);
        setCellStyle(pdf_cell, cell_style, Entry.TYPE_IMAGE);
      }
      catch (BadElementException e)
      {
        if (logger_.isEnabledFor(Level.ERROR))
        {
          logger_.error("BadElementException:" + e.getMessage());
        }
        PDFDocumentException pde = new PDFDocumentException(220, "PDF table can not created");
        throw pde;
      }
      catch (MalformedURLException e)
      {
        if (logger_.isEnabledFor(Level.ERROR))
        {
          logger_.error("MalformedURLException:" + e.getMessage());
        }
        PDFDocumentException pde = new PDFDocumentException(221, "PDF table can not created");
        throw pde;
      }
      catch (IOException e)
      {
        if (logger_.isEnabledFor(Level.ERROR))
        {
          logger_.error("Error Code: 222, IOException:" + e.getMessage());
        }
        PDFDocumentException pde = new PDFDocumentException(222, "PDF table can not created: Image can not loaded");
        throw pde;
      }
      break;
    case Entry.TYPE_TABLE:
      Table table = (Table) abstractCell.getValue();
      // inherit the style from the parent table
      Style inherit_style = Style.doInherit(table.getStyle(), cell_style);
      table.setStyle(inherit_style);
      PdfPTable pdf_table = renderTable(table);
      pdf_cell = new PdfPCell(pdf_table);
      // The default new PdfPCell has a default border of 15.
      // For blocks without border and subtables this results
      // in a border to be drawn around the cell.
      // ==> no border on default
      pdf_cell.setBorder(0);
      break;
    }
    return pdf_cell;
  }

  /**
   * This method visualize an abstract table into a corresponding pdf table. The
   * new pdf table is redered and get the style information from the abstract
   * cell.
   * 
   * @param abstractTable
   *          the abstract table definition
   * @return the new redererd pdf table cell
   * @throws PDFDocumentException
   *           ErrorCode:220, 221, 222, 223
   * @see com.lowagie.text.pdf.PdfPTable
   * @see at.knowcenter.wag.egov.egiz.table.Table
   */
  private PdfPTable renderTable(Table abstractTable) throws PDFDocumentException
  {
    if (abstractTable == null)
    {
      PDFDocumentException pde = new PDFDocumentException(223, "Table is not defined.");
      throw pde;
    }
    PdfPTable pdf_table = null;
    float[] cols = abstractTable.getColsRelativeWith();
    int max_cols = abstractTable.getMaxCols();
    if (cols == null)
    {
      cols = new float[max_cols];
      // set the column ratio for all columns to 1
      for (int cols_idx = 0; cols_idx < cols.length; cols_idx++)
      {
        cols[cols_idx] = 1;
      }
    }
    pdf_table = new PdfPTable(cols);
    pdf_table.setWidthPercentage(abstractTable.getWidth());
    Style table_style = abstractTable.getStyle();
    setCellStyle(pdf_table.getDefaultCell(), table_style, Entry.TYPE_TABLE);

    ArrayList rows = abstractTable.getRows();
    for (int row_idx = 0; row_idx < rows.size(); row_idx++)
    {
      ArrayList row = (ArrayList) rows.get(row_idx);
      // logger_.debug("## Row:" + row_idx + " ## of table:" +
      // abstractTable.getName());
      for (int entry_idx = 0; entry_idx < row.size(); entry_idx++)
      {
        Entry cell = (Entry) row.get(entry_idx);
        // 03.11.2010 changed by exthex - swapped the two params, was probably a bug
        Style inherit_style = Style.doInherit(table_style, cell.getStyle());
        cell.setStyle(inherit_style);
        // logger_.debug(cell.toString());
        PdfPCell pdf_cell = renderCell(cell);
        if (cell.getColSpan() > 1)
        {
          pdf_cell.setColspan(cell.getColSpan());
        }
        if (cell.isNoWrap())
        {
          pdf_cell.setNoWrap(true);
        }
        // System.err.println("valign:" + pdf_cell.getVerticalAlignment() + "
        // halign:" +
        // pdf_cell.getHorizontalAlignment());
        pdf_table.addCell(pdf_cell);
      }
    }
    // logger_.debug("render table:" + abstractTable.getName());
    return pdf_table;
  }

  /**
   * This method creates the pdf table object. It takes the abstract table
   * definition from the signature object and render the abstract table.
   * 
   * @param sigObject
   *          the signature object, the base for the abstract table definition
   * @return R
   * @throws PDFDocumentException
   *           ErrorCode:220, 221, 222, 223
   */
  private PdfPTable createPDFSignatureObject(SignatureObject sigObject) throws PDFDocumentException
  {
     SubsetLocal.clear();
    Table table = sigObject.getAbstractTable();
    PdfPTable pdf_table = renderTable(table);
    return pdf_table;
  }

  /*
   * This method search for the table definitions in the settings file an init
   * @param sigObject
   */
  /*
   * private void initTableSettings(SignatureObject sigObject) { String sig_type =
   * sigObject.getSignationType(); String table_key = SignatureObject.SIG_OBJ +
   * sig_type + ".table."; ArrayList main_rows = settings_.getKeys(table_key +
   * "main"); }
   */

  /**
   * Converts the current abstract signature object in a pdf signature object
   * implementation
   * 
   * @return the converted pdf signature object
   * @see at.knowcenter.wag.egov.egiz.pdf.PDFSignatureObject#getSignatureObject()
   */
  public Object getSignatureObject() throws PDFDocumentException
  {
    if (pdfSigObject_ == null)
    {
      pdfSigObject_ = (PdfPTable) getSignatureObject(sigObject_);
    }
    return pdfSigObject_;
  }

  /**
   * Converts a abstract signature object in a pdf signature object
   * implementation
   * 
   * @param sigObject
   *          the abstract signatorObject to convert
   * @return the converted pdf signature object
   * @throws PDFDocumentException 
   * @see at.knowcenter.wag.egov.egiz.pdf.PDFSignatureObject#getSignatureObject(at.knowcenter.wag.egov.egiz.sig.SignatureObject)
   */
  public Object getSignatureObject(SignatureObject sigObject) throws PDFDocumentException
  {
      // initTableSettings(sigObject);
      return createPDFSignatureObject(sigObject);
  }
}