<?php
/*
 * LimeSurvey
 * Copyright (C) 2007-2011 The LimeSurvey Project Team / Carsten Schmitz
 * All rights reserved.
 * License: GNU/GPL License v2 or later, see LICENSE.php
 * LimeSurvey is free software. This version may have been modified pursuant
 * to the GNU General Public License, and as distributed it includes or
 * is derivative of works licensed under the GNU General Public License or
 * other free or open source software licenses.
 * See COPYRIGHT.php for copyright notices and details.
 *
 */
# override the default TCPDF config file
if(!defined('K_TCPDF_EXTERNAL_CONFIG')) {
  define('K_TCPDF_EXTERNAL_CONFIG', TRUE);
}

# include TCPDF
require(APPPATH.'config/tcpdf'.EXT);

/**
 * page format
 */
(!defined ('PDF_PAGE_FORMAT')) ? (define ('PDF_PAGE_FORMAT', isset($tcpdf['page_format']) ? $tcpdf['page_format'] : 'A4')):'';

/**
 * page orientation (P=portrait, L=landscape)
 */
(!defined ('PDF_PAGE_ORIENTATION')) ? (define('PDF_PAGE_ORIENTATION', isset($tcpdf['page_orientation']) ? $tcpdf['page_orientation'] :'P')):'';

/**
 * document creator
 */
(!defined ('PDF_CREATOR'))?(define ('PDF_CREATOR', isset($tcpdf['creator']) ? $tcpdf['creator'] : 'TCPDF')):'';

/**
 * document author
 */
(!defined ('PDF_AUTHOR'))? (define ('PDF_AUTHOR', isset($tcpdf['author']) ? $tcpdf['author'] : 'TCPDF')):'';

/**
 * header title
 */
(!defined ('PDF_HEADER_TITLE'))? (define ('PDF_HEADER_TITLE', isset($tcpdf['header_title']) ? $tcpdf['header_title'] : 'TCPDF Example')):'';

/**
 * header description string
 */
(!defined ('PDF_HEADER_STRING'))? (define ('PDF_HEADER_STRING', isset($tcpdf['header_string']) ? $tcpdf['header_string'] : "by Nicola Asuni - Tecnick.com\nwww.tcpdf.org")):'';

/**
 * image logo
 */
(!defined ('PDF_HEADER_LOGO'))? (define ('PDF_HEADER_LOGO', isset($tcpdf['header_logo']) ? $tcpdf['header_logo'] : 'tcpdf_logo.jpg')):'';

/**
 * header logo image width [mm]
 */
(!defined ('PDF_HEADER_LOGO_WIDTH'))? (define ('PDF_HEADER_LOGO_WIDTH', isset($tcpdf['header_logo_width']) ? $tcpdf['header_logo_width'] : 30)):'';

/**
 *  document unit of measure [pt=point, mm=millimeter, cm=centimeter, in=inch]
 */
(!defined ('PDF_UNIT'))? (define ('PDF_UNIT', isset($tcpdf['page_unit']) ? $tcpdf['page_unit'] : 'mm')):'';

/**
 * header margin
 */
(!defined ('PDF_MARGIN_HEADER'))? (define ('PDF_MARGIN_HEADER', isset($tcpdf['header_margin']) ? $tcpdf['header_margin'] : 5)):'';

/**
 * footer margin
 */
(!defined ('PDF_MARGIN_FOOTER'))? (define ('PDF_MARGIN_FOOTER', isset($tcpdf['footer_margin']) ? $tcpdf['footer_margin'] : 10)):'';

/**
 * top margin
 */
(!defined ('PDF_MARGIN_TOP'))? (define ('PDF_MARGIN_TOP', isset($tcpdf['margin_top']) ? $tcpdf['margin_top'] : 27)):'';

/**
 * bottom margin
 */
(!defined ('PDF_MARGIN_BOTTOM'))? (define ('PDF_MARGIN_BOTTOM', isset($tcpdf['margin_bottom']) ? $tcpdf['margin_bottom'] : 25)):'';

/**
 * left margin
 */
(!defined ('PDF_MARGIN_LEFT'))? (define ('PDF_MARGIN_LEFT', isset($tcpdf['margin_left']) ? $tcpdf['margin_left'] : 15)):'';

/**
 * right margin
 */
(!defined ('PDF_MARGIN_RIGHT'))? (define ('PDF_MARGIN_RIGHT', isset($tcpdf['margin_right']) ? $tcpdf['margin_right'] : 15)):'';

/**
 * default main font name
 */
(!defined ('PDF_FONT_NAME_MAIN'))? (define ('PDF_FONT_NAME_MAIN', isset($tcpdf['page_font']) ? $tcpdf['page_font'] : 'helvetica')):'';

/**
 * default main font size
 */
(!defined ('PDF_FONT_SIZE_MAIN'))? (define ('PDF_FONT_SIZE_MAIN', isset($tcpdf['page_font_size']) ? $tcpdf['page_font_size'] : 10)):'';

/**
 * default data font name
 */
(!defined ('PDF_FONT_NAME_DATA'))? (define ('PDF_FONT_NAME_DATA', isset($tcpdf['data_font']) ? $tcpdf['data_font'] : 'helvetica')):'';

/**
 * default data font size
 */
(!defined ('PDF_FONT_SIZE_DATA'))? (define ('PDF_FONT_SIZE_DATA', isset($tcpdf['data_font_size']) ? $tcpdf['data_font_size'] : 8)):'';

/**
 * default monospaced font name
 */
(!defined ('PDF_FONT_MONOSPACED'))? (define ('PDF_FONT_MONOSPACED', isset($tcpdf['mono_font']) ? $tcpdf['mono_font'] : 'courier')):'';

/**
 * ratio used to adjust the conversion of pixels to user units
 */
(!defined ('PDF_IMAGE_SCALE_RATIO'))? (define ('PDF_IMAGE_SCALE_RATIO', isset($tcpdf['image_scale']) ? $tcpdf['image_scale'] : 1.25)):'';

/**
 * magnification factor for titles
 */
(!defined('HEAD_MAGNIFICATION'))? (define('HEAD_MAGNIFICATION', 1.1)):''; // never used in TCPDF 6.

/**
 * height of cell repect font height
 */
(!defined('K_CELL_HEIGHT_RATIO'))? (define('K_CELL_HEIGHT_RATIO', isset($tcpdf['cell_height_ratio']) ? $tcpdf['cell_height_ratio'] : 1.25)):'';

/**
 * title magnification respect main font size
 */
(!defined('K_TITLE_MAGNIFICATION'))? (define('K_TITLE_MAGNIFICATION', 1.3)):''; // never used in TCPDF 6.

/**
 * reduction factor for small font
 */
(!defined('K_SMALL_RATIO'))? (define('K_SMALL_RATIO', isset ($tcpdf['small_font_ratio']) ? $tcpdf['small_font_ratio'] : 2/3)):'';

/**
 * set to true to enable the special procedure used to avoid the overlapping of symbols on Thai language
 */
(!defined('K_THAI_TOPCHARS'))? (define('K_THAI_TOPCHARS', isset($tcpdf['thai_top_chars']) ? $tcpdf['thai_top_chars'] : true)):'';

/**
 * if true allows to call TCPDF methods using HTML syntax
 * IMPORTANT: For security reason, disable this feature if you are printing user HTML content.
 */
(!defined('K_TCPDF_CALLS_IN_HTML'))? (define('K_TCPDF_CALLS_IN_HTML', isset($tcpdf['tcpdf_in_html']) ? $tcpdf['tcpdf_in_html'] : true)):'';

require_once($tcpdf['base_directory'].'/tcpdf.php');


/************************************************************
 * TCPDF - CodeIgniter Integration
 * Library file
 * ----------------------------------------------------------
 * @author Jonathon Hill http://jonathonhill.net
 * @version 1.0
 * @package tcpdf_ci
 ***********************************************************/
class pdf extends TCPDF {


  /**
   * TCPDF system constants that map to settings in our config file
   *
   * @var array
   * @access private
   */
  private $cfg_constant_map = array(
    'K_PATH_MAIN'	=> 'base_directory',
    'K_PATH_URL'	=> 'base_url',
    'K_PATH_FONTS'	=> 'fonts_directory',
    'K_PATH_CACHE'	=> 'cache_directory',
    'K_PATH_IMAGES'	=> 'image_directory',
    'K_BLANK_IMAGE' => 'blank_image',
    'K_SMALL_RATIO'	=> 'small_font_ratio',
  );


  /**
   * Settings from our APPPATH/config/tcpdf.php file
   *
   * @var array
   * @access private
   */
  private $_config = array();

  /**
   * Base font size for answer PDF export
   *
   * @var int
   * @access private
   */
  private $_ibaseAnswerFontSize = 12;

  /**
   * Cell height for answer PDF export
   *
   * @var int
   * @access private
   */
  private $_iCellHeight = 6;

  /**
   * Survey Information (preventing from passing to methods every time)
   *
   * @var array
   * @access private
   */
  private $_aSurveyInfo = array();

  /**
   * Set _config for pdf
   * @access public
   * @param mixed $tcpdf
   * @return
   */
  public function setConfig($tcpdf) {
    $this->_config=$tcpdf;
  }


  /**
   * Initialize and configure TCPDF with the settings in our config file
   *
   */
  function __construct() {

    # load the config file
    require(APPPATH.'config/tcpdf'.EXT);
    $this->_config = $tcpdf;
    unset($tcpdf);


    # set the TCPDF system constants
    foreach($this->cfg_constant_map as $const => $cfgkey) {
      if(!defined($const)) {
        define($const, $this->_config[$cfgkey]);
        #echo sprintf("Defining: %s = %s\n<br />", $const, $this->_config[$cfgkey]);
      }
    }

    # initialize TCPDF
    parent::__construct(
      $this->_config['page_orientation'],
      $this->_config['page_unit'],
      $this->_config['page_format'],
      $this->_config['unicode'],
      $this->_config['encoding'],
      $this->_config['enable_disk_cache']
    );


    # margin settings
    $this->SetMargins($this->_config['margin_left'], $this->_config['margin_top'], $this->_config['margin_right']);

    # header settings
    $this->print_header = $this->_config['header_on'];
    #$this->print_header = FALSE;
    $this->setHeaderFont(array($this->_config['header_font'], '', $this->_config['header_font_size']));
    $this->setHeaderMargin($this->_config['header_margin']);
    $this->SetHeaderData();
    //$this->SetHeaderData(
    //	$this->_config['header_logo'],
    //	$this->_config['header_logo_width'],
    //	$this->_config['header_title'],
    //	$this->_config['header_string']
    //);

    # footer settings
    $this->print_footer = $this->_config['footer_on'];
    $this->setFooterFont(array($this->_config['footer_font'], '', $this->_config['footer_font_size']));
    $this->setFooterMargin($this->_config['footer_margin']);

    # page break
    $this->SetAutoPageBreak($this->_config['page_break_auto'], $this->_config['footer_margin']);

    # cell settings
    $this->cMargin = $this->_config['cell_padding'];
    $this->setCellHeightRatio($this->_config['cell_height_ratio']);

    # document properties
    $this->author = $this->_config['author'];
    $this->creator = $this->_config['creator'];

    # font settings
    #$this->SetFont($this->_config['page_font'], '', $this->_config['page_font_size']);

    # image settings
    $this->setImageScale($this->_config['image_scale']);

  }

  /**
   *
   * obsolete
   * @param $text
   * @param $format
   * @return unknown_type
   */
  function intopdf($text,$format='')
  {
    $text = $this->delete_html($text);
    $oldformat = $this->FontStyle;
    $this->SetFont('',$format,$this->FontSizePt);
    $this->Write(5,$text);
    $this->ln(5);
    $this->SetFont('',$oldformat,$this->FontSizePt);
  }
  /**
   *
   * obsolete
   * @param $text
   * @return unknown_type
   */
  function helptextintopdf($text)
  {
    $oldsize = $this->FontSizePt;
    $this->SetFontSize($oldsize-2);
    $this->Write(5,$this->delete_html($text));
    $this->ln(5);
    $this->SetFontSize($oldsize);
  }
  /**
   *
   * writes a big title in the page + description
   * @param $title
   * @param $description
   * @return unknown_type
   */
  function titleintopdf($title,$description='')
  {
    if(!empty($title))
    {
      $title = $this->delete_html($title);
      $oldsize = $this->FontSizePt;
      $this->SetFontSize($oldsize+4);
      $this->Line(5,$this->y,($this->w-5),$this->y);
      $this->ln(3);
      $this->MultiCell('','',$title,'','C',0);
      if(!empty($description) && isset($description))
      {
        $description = $this->delete_html($description);
        $this->ln(7);
        $this->SetFontSize($oldsize+2);
        $this->MultiCell('','',$description,'','C',0);
        $this->ln(2);
      }
      else
      {
        $this->ln(4);
      }
      $this->Line(5,$this->y,($this->w-5),$this->y);
      $this->ln(5);
      $this->SetFontSize($oldsize);
    }
  }
  /**
   *
   * Creates a Table with equal cell width and Bold text. Used as Head for equalTable()
   * @param $array(0=>)
   * @return unknown_type
   */
  function tablehead($array)
  {
    //$maxwidth = array();
    $maxwidth = $this->getEqualWidth($array);
    $oldStyle = $this->FontStyle;
    $this->SetFont($this->FontFamily, 'B', $this->FontSizePt);
    for($a=0;$a<sizeof($array);$a++)
    {
      for($b=0;$b<sizeof($array[$a]);$b++)
      {
        $this->Cell($maxwidth,4,$this->delete_html($array[$a][$b]),0,0,'L');
      }
      $this->ln();
    }
    $this->ln(5);
    $this->SetFont($this->FontFamily, $oldStyle, $this->FontSizePt);
  }
  /**
   *
   * Creates a Table with equal cell width.
   * @param $array - table array( 0=> array("td", "td", "td"),
   * 								1=> array("td", "td", "td"))
   * @param $modulo - fills each second row with a light-grey for better visibility. Default is on turn off with 0
   * @return unknown_type
   */
  function equalTable($array, $modulo=1)
  {
    //$maxwidth = array();
    $maxwidth = $this->getEqualWidth($array);
    $this->SetFillColor(220, 220, 220);
    for($a=0;$a<sizeof($array);$a++)
    {
      if($modulo){
        if($a%2 === 0){$fill=0;}
        else{$fill=1;}
      }
      else{$fill=0;}
      for($b=0;$b<sizeof($array[$a]);$b++)
      {

        $this->Cell($maxwidth,4,$this->delete_html($array[$a][$b]),0,0,'L',$fill);

      }
      $this->ln();
    }
    $this->ln(5);
  }
  /**
   *
   * creates a table using the full width of page
   * @param $array - table array( 0=> array("td", "td", "td"),
   * 								1=> array("td", "td", "td"))
   * @param $modulo - fills each second row with a light-grey for better visibility. Default is off, turn on with 1
   * @return unknown_type
   */
  function tableintopdf($array, $modulo=1 )
  {
    $maxwidth = array();
    $maxwidth = $this->getFullWidth($array);

    $this->SetFillColor(220, 220, 220);
    for($a=0;$a<sizeof($array);$a++)
    {
      if($modulo){
        if($a%2 === 0){$fill=0;}
        else{$fill=1;}
      }
      else{$fill=0;}
      for($b=0;$b<sizeof($array[$a]);$b++)
      {
        //echo $maxwidth[$b]." max $b.Spalte<br/>";
        $this->Cell($maxwidth[$b],4,$this->delete_html($array[$a][$b]),0,0,'L',$fill);
      }
      $this->ln();
    }
    $this->ln(5);
  }
  /**
   *
   * creates a table with a bold head using the full width of page
   * @param $head - head array( 0=> array("th", "th", "th"))
   * @param $table - table array( 0=> array("td", "td", "td"),
   * 								1=> array("td", "td", "td"))
   * @param $modulo - fills each second row with a light-grey for better visibility. Default is on, turn off with 0
   * @return unknown_type
   */
  function headTable($head, $table, $modulo=1 )
  {
    $array = array_merge_recursive($head, $table);
    //print_r($array);
    $maxwidth = array();
    $maxwidth = $this->getFullWidth($array);

    $this->SetFillColor(220, 220, 220);
    for($a=0;$a<sizeof($array);$a++)
    {
      if($modulo){
        if($a%2 === 0){$fill=1;}
        else{$fill=0;}
      }
      else{$fill=0;}
      for($b=0;$b<sizeof($array[$a]);$b++)
      {
        $bEndOfCell=0;
        if ($b==sizeof($array[$a])-1)
        {
          $bEndOfCell=1;
        }

        if($a==0)
        {
          $oldStyle = $this->FontStyle;
          $this->SetFont($this->FontFamily, 'B', $this->FontSizePt);

          if ($maxwidth[$b] > 140) $maxwidth[$b]=130;
          if ($maxwidth[$b] < 25) $maxwidth[$b]=25;
          $this->MultiCell($maxwidth[$b],6,$this->delete_html($array[$a][$b]),0,'L',1,$bEndOfCell);

          $this->SetFont($this->FontFamily, $oldStyle, $this->FontSizePt);
        }
        else
        {
          if ($a==1)
          {
            $this->SetFillColor(240, 240, 240);
          }
          //echo $maxwidth[$b]." max $b.Spalte<br/>";

          if ($maxwidth[$b] > 140) $maxwidth[$b]=130;
          if ($b==0)
          {
            $iHeight=$this->getStringHeight($maxwidth[$b],$this->delete_html($array[$a][$b]));
            $this->MultiCell($maxwidth[$b],$iHeight,$this->delete_html($array[$a][$b]),0,'L',$fill,$bEndOfCell);
          }
          else
          {
            $iLines=$this->getStringHeight($maxwidth[$b],$this->delete_html($array[$a][$b]));
            if ($iLines>$iHeight) $iHeight=$iLines;
            $this->MultiCell($maxwidth[$b],$iHeight,$this->delete_html($array[$a][$b]),0,'L',$fill,$bEndOfCell);
          }
        }
      }
    }
    $this->ln(5);
  }
  function getminwidth($array)
  {
    $width = array();
    for($i=0;$i<sizeof($array);$i++)
    {
      for($j=0;$j<sizeof($array[$i]);$j++)
      {
        $stringWidth=0;
        $chars = str_split($this->delete_html($array[$i][$j]),1);
        foreach($chars as $char)
        {
          $stringWidth = $stringWidth+$this->GetCharWidth($char);

          //echo $stringWidth.": ".$char."<br/>";
        }
        if($stringWidth!=0 && $stringWidth<8)
          $stringWidth = $stringWidth*3;
        if(!isset($width[$j])|| $stringWidth>$width[$j])
        {
          $width[$j] = $stringWidth;
        }
      }
    }
    return $width;
  }
  function getmaxwidth($array)
  {
    for($i=0;$i<sizeof($array);$i++)
    {
      for($j=0;$j<sizeof($array[$i]);$j++)
      {
        if(($i-1)>=0)
        {
          if(strlen($this->delete_html($array[($i-1)][$j])) < strlen($this->delete_html($array[$i][$j])))
          {
            $width[$j] = strlen($this->delete_html($array[$i][$j]));
          }
        }
        else
        {
          $width[$j]=strlen($this->delete_html($array[$i][$j]));
        }
      }
    }
    return ($width);
  }
  /**
   *
   * Gets the width for columns in a table based on their Stringlength and the width of the page...
   * @param $array
   * @return array with column width
   */
  function getFullWidth($array)
  {
    $maxlength = array();
    $width = array();
    $width = $this->getminwidth($array);

    $margins = $this->getMargins();
    $deadSpace = $margins['left']+$margins['right'];
    $fullWidth = ($this->GetLineWidth()*1000)-$deadSpace;
    $faktor = $fullWidth/array_sum($width);

    for($i=0;$i<sizeof($width);$i++)
    {
      $maxlength[$i]=$faktor*$width[$i];
    }
    return $maxlength;
  }
  /**
   *
   * gets the width for each column in tables, based on pagewidth and count of columns.
   * Good for static tables with equal value String-length
   * @param $array
   * @return unknown_type
   */
  function getEqualWidth($array)
  {
    $margins = $this->getMargins();
    $deadSpace = $margins['left']+$margins['right'];

    $width = ($this->GetLineWidth()*1000)-$deadSpace;
    $count = 0;
    for($i=0;$i<sizeof($array);$i++)
    {
      for($j=0;$j<sizeof($array[$i]);$j++)
      {
        if(sizeof($array[$i])>$count)
        {
          $count = sizeof($array[$i]);
        }
      }
    }

    if($count!=0)
      return ($width/$count);
    else
      return FALSE;
  }
  function write_out($name)
  {
    $this->Output($name,"D");
  }

  function delete_html($text)
  {
    $text = html_entity_decode($text,null,'UTF-8');
    $text = str_replace("\t",' ',$text);
    return strip_tags($text);
  }
  /**
   *
   * Create Answer PDF document, set metadata and set title
   * @param $aSurveyInfo - Survey Information (preventing from passing to methods every time)
   * @param $aPdfLanguageSettings - Pdf language settings
   * @param $sSiteName - LimeSurvey site name (header and metadata)
   * @param $sSurveyName - Survey name (header, metadata and title),
   * @param $sDefaultHeaderString - TCPDF header string
   * @return unknown_type
   */
  function initAnswerPDF($aSurveyInfo, $aPdfLanguageSettings, $sSiteName, $sSurveyName, $sDefaultHeaderString = '')
  {
    if (empty($sDefaultHeaderString))
      $sDefaultHeaderString = $sSurveyName;

    $this->_aSurveyInfo = $aSurveyInfo;
    $this->SetAuthor($sSiteName);
    $this->SetTitle($sSurveyName);
    $this->SetSubject($sSurveyName);
    $this->SetKeywords($sSurveyName);

    $this->SetFont($aPdfLanguageSettings['pdffont']);
    $this->_ibaseAnswerFontSize = $aPdfLanguageSettings['pdffontsize'];
    $this->_iCellHeight = ceil($this->_ibaseAnswerFontSize / 2);
    $this->setLanguageArray($aPdfLanguageSettings['lg']);

    $this->addHeader($aPdfLanguageSettings, $sSiteName, $sDefaultHeaderString);
    $this->AddPage();
    $this->SetFillColor(220, 220, 220);

    $this->addTitle($sSurveyName);
  }

  /**
   *
   * Add title to pdf
   * @param $sTitle - Title
   * @param $sSubtitle - Subtitle
   * @return unknown_type
   */
  function addTitle($sTitle, $sSubtitle="")
  {
    if(!empty($sTitle))
    {
      $this->ln(1);
      $this->SetFontSize($this->_ibaseAnswerFontSize + 6);
      $oPurifier = new CHtmlPurifier();
      $sTitleHTML = html_entity_decode(stripJavaScript($oPurifier->purify($sTitle)),ENT_COMPAT);
      $this->WriteHTMLCell(0, $this->_iCellHeight, $this->getX(), $this->getY(), $sTitleHTML, 0, 1, false, true, 'C');
      if (!empty($sSubtitle))
      {
        $this->ln(1);
        $this->SetFontSize($this->_ibaseAnswerFontSize + 2);
        $sSubtitleHTML = html_entity_decode(stripJavaScript($oPurifier->purify($sSubtitle)),ENT_COMPAT);
        $this->WriteHTMLCell(0, $this->_iCellHeight, $this->getX(), $this->getY(), $sSubtitleHTML, 0, 1, false, true, 'C');
      }
      $this->ln(6);
      $this->SetFontSize($this->_ibaseAnswerFontSize);
    }
  }

  /**
   *
   * Add header to pdf
   * @param $aPdfLanguageSettings - Pdf language settings
   * @param $sSiteName - LimeSurvey site name (header and metadata)
   * @param $sDefaultHeaderString - TCPDF header string
   * @return unknown_type
   */
  function addHeader($aPdfLanguageSettings, $sSiteName, $sDefaultHeaderString)
  {
    $sLogoFileName = Yii::app()->getConfig('pdflogofile');
    if (Yii::app()->getConfig('pdfshowheader')=='Y' && file_exists(K_PATH_IMAGES.$sLogoFileName))
    {
      $sHeaderTitle = Yii::app()->getConfig('pdfheadertitle');
      if ($sHeaderTitle == '') $sHeaderTitle = $sSiteName;
      $sHeaderString = Yii::app()->getConfig('pdfheaderstring');
      if ($sHeaderString == '') $sHeaderString = $sDefaultHeaderString;

      $this->SetHeaderData($sLogoFileName, Yii::app()->getConfig('pdflogowidth'), $sHeaderTitle, $sHeaderString);
      $this->SetHeaderFont(Array($aPdfLanguageSettings['pdffont'], '', $this->_ibaseAnswerFontSize - 2));
      $this->SetFooterFont(Array($aPdfLanguageSettings['pdffont'], '', $this->_ibaseAnswerFontSize - 2));
    }
  }

  /**
   *
   * Add GID text to PDF
   * @param $sFname - Answer field text
   * @param $bAllowBreakPage - Allow break cell in two pages
   * @return unknown_type
   */
  function addGidAnswer($sFname, $bAllowBreakPage=false)
  {
    $oPurifier = new CHtmlPurifier();
    $sAnswerHTML = html_entity_decode(stripJavaScript($oPurifier->purify($sFname)),ENT_COMPAT);
    $sData['thissurvey']=$this->_aSurveyInfo;
    $sAnswerHTML = templatereplace($sAnswerHTML, array() , $sData, '', $this->_aSurveyInfo['anonymized']=="Y",NULL, array(), true);

    $startPage = $this->getPage();
    $this->startTransaction();
    $this->ln(6);
    $this->SetFontSize($this->_ibaseAnswerFontSize + 2);
    $this->WriteHTMLCell(0, $this->_iCellHeight, $this->getX(), $this->getY(), $sAnswerHTML, 0, 1, false, true, 'L');
    $this->ln(2);
    if ($this->getPage() != $startPage && !$bAllowBreakPage)
    {
      $this->rollbackTransaction(true);
      $this->AddPage();
      $this->addGidAnswer($sFname,true); // Second param = true avoid an endless loop if a cell is longer than a page
    }
    else
    {
      $this->commitTransaction();
    }
  }

  /**
   *
   * Add answer to PDF
   *
   * @param $sQuestion - Question field text array
   * @param $sResponse - Answer field text array
   * @param $bReplaceExpressions - Try to replace LimeSurvey Expressions. This is false when exporting answers PDF from admin GUI
   *                               because we can not interpret expressions so just purify.
   *                               TODO: Find a universal valid method to interpret expressions
   * @param $bAllowBreakPage - Allow break cell in two pages
   * @return unknown_type
   */
  function addAnswer($sQuestion, $sResponse, $bReplaceExpressions=true, $bAllowBreakPage=false)
  {
    $oPurifier = new CHtmlPurifier();
    $sQuestionHTML = str_replace('-oth-','',$sQuestion); // Copied from Writer::stripTagsFull. Really necessary?
    $sQuestionHTML = html_entity_decode(stripJavaScript($oPurifier->purify($sQuestionHTML)),ENT_COMPAT);
    if ($bReplaceExpressions)
    {
        $sData['thissurvey']=$this->_aSurveyInfo;
        $sQuestionHTML = templatereplace($sQuestionHTML, array() , $sData, '', $this->_aSurveyInfo['anonymized']=="Y",NULL, array(), true);
    }
    $sResponse = flattenText($sResponse, false, true, 'UTF-8', false);

    $startPage = $this->getPage();
    $this->startTransaction();
    $this->SetFontSize($this->_ibaseAnswerFontSize);
    $this->WriteHTMLCell(0, $this->_iCellHeight, $this->getX(), $this->getY(), $sQuestionHTML, 1, 1, true, true, 'L');
    $this->MultiCell(0, $this->_iCellHeight, $sResponse, 1, 'L', 0, 1, '', '', true);
    $this->ln(2);
    if ($this->getPage() != $startPage && !$bAllowBreakPage)
    {
      $this->rollbackTransaction(true);
      $this->AddPage();
      $this->addAnswer($sQuestion,$sResponse,$bReplaceExpressions,true); // "Last param = true" prevents an endless loop if a cell is longer than a page
    }
    else
    {
      $this->commitTransaction();
    }
  }
}