<?php
/**
 * Visforms
 *
 * @author       Ingmar Vack
 * @package      Joomla.Administrator
 * @subpackage   com_visforms
 * @link         https://www.vi-solutions.de
 * @license      GNU General Public License version 2 or later; see license.txt
 * @copyright    2018 vi-solutions
 * @since        Joomla 3.0.0
 */

defined('_JEXEC') or die('Restricted access');
require_once(JPATH_ROOT . '/libraries/visolutions/tcpdf/tcpdf.php');

class visTCPDF extends visformsTCPDF
{
	public $headerTemplate;
	public $showHeader;

	public $footerTemplate;
	public $showFooter;

	public $backgroundImage;
	public $showBackgroundImage;
	public $pageSize;
	public $orientation;

	// construction

	public function __construct($orientation='P', $unit='mm', $format='A4', $unicode=true, $encoding='UTF-8', $diskcache=false, $pdfa=false) {
		parent::__construct($orientation, $unit, $format, $unicode, $encoding, $diskcache, $pdfa);
		$this->orientation = $orientation;
		$this->showHeader = false;
		$this->showFooter = false;
		// does show effect in standalone adobe application viewer only
		$this->SetDisplayMode('fullpage');
		// no effect so far
		$this->setViewerPreferences(array('FitWindow' => true));
		// page size in mm
		$this->pageSize = visformsTCPDF_STATIC::getPageSizeFromFormat($format);
		$this->pageSize[0] = (int) $this->pageSize[0] * 25.4 / 72;
		$this->pageSize[1] = (int) $this->pageSize[1] * 25.4 / 72 ;
		// page number placeholders need this to work as expected
		$this->setHeaderTemplateAutoreset(true);
	}

	// getter and setter

	public function setHeaderTemplate($hdrTemplate) { $this->headerTemplate = $hdrTemplate; }
	public function setShowHeader($show) { $this->showHeader = $show; }

	public function setFooterTemplate($ftrTemplate) { $this->footerTemplate = $ftrTemplate; }
	public function setShowFooter($show) { $this->showFooter = $show; }

	public function setBackgroundImage($backgroundImage) {
		// todo: check final image path like '/' or 'something/somewhat/'
		$this->backgroundImage = $backgroundImage;
	}
	public function setShowBackgroundImage($show) { $this->showBackgroundImage = $show; }

	// overwrites

	public function Header() {
		if($this->showBackgroundImage && !empty($this->backgroundImage)) {
			$this->insertBackgroundImage();
		}

		if( !$this->showHeader) {
			return;
		}

		$cw = $this->w - $this->original_lMargin - $this->original_rMargin;
		$text = $this->processPageNumberText_byAliasReplacement($this->headerTemplate);
		$this->writeHTMLCell($cw, 0, $this->x, $this->y, $text, 0, 1, 0, true, '', true);
	}

	public function Header_UsingTemplate() {
		if($this->showBackgroundImage && !empty($this->backgroundImage)) {
			$this->insertBackgroundImage();
		}

		if( !$this->showHeader) {
			return;
		}

		if ($this->header_xobjid === false) {
			// start a new XObject Template
			$this->header_xobjid = $this->startTemplate($this->w, $this->tMargin);
			$headerfont = $this->getHeaderFont();

			$this->y = $this->header_margin;
			if ($this->rtl) {
				$this->x = $this->w - $this->original_rMargin;
			} else {
				$this->x = $this->original_lMargin;
			}

			$cw = $this->w - $this->original_lMargin - $this->original_rMargin;
			$text = $this->processPageNumberText_byAliasReplacement($this->headerTemplate);
			$this->writeHTMLCell($cw, 0, $this->x, $this->y, $text, 0, 1, 0, true, '', true);
			$this->endTemplate();
		}
		// print header template
		$x = 0;
		$dx = 0;
		if (!$this->header_xobj_autoreset AND $this->booklet AND (($this->page % 2) == 0)) {
			// adjust margins for booklet mode
			$dx = ($this->original_lMargin - $this->original_rMargin);
		}
		if ($this->rtl) {
			$x = $this->w + $dx;
		} else {
			$x = 0 + $dx;
		}
		$this->printTemplate($this->header_xobjid, $x, 0, 0, 0, '', '', false);
		if ($this->header_xobj_autoreset) {
			// reset header xobject template at each page
			$this->header_xobjid = false;
		}
	}

	public function Footer() {
		if( !$this->showFooter) {
			return;
		}

		$cw = $this->w - $this->original_lMargin - $this->original_rMargin;
		$text = $this->processPageNumberText_byAliasReplacement($this->footerTemplate);
		$this->writeHTMLCell($cw, 0, $this->x, $this->y, $text, 0, 1, 0, true, '', true);
	}

	// internal overwrites

	protected function openHTMLTagHandler($dom, $key, $cell) {
		$tag = $dom[$key];
		if('img' == $tag['value']) {
			$file = $tag['attribute']['src'];
			$file = $this->stripOffImageSourceBase64Identifier($file);
			$dom[$key]['attribute']['src'] = $file;
		}
		return parent::openHTMLTagHandler($dom, $key, $cell);
	}

	public function Image($file, $x='', $y='', $w=0, $h=0, $type='', $link='', $align='', $resize=false, $dpi=300, $palign='', $ismask=false, $imgmask=false, $border=0, $fitbox=false, $hidden=false, $fitonpage=false, $alt=false, $altimgs=array()) {
		$file = $this->maintainFilePath($file);
		return parent::Image($file, $x, $y, $w, $h, $type, $link, $align, $resize, $dpi, $palign, $ismask, $imgmask, $border, $fitbox, $hidden, $fitonpage, $alt, $altimgs);
	}

	public function ImageEps($file, $x='', $y='', $w=0, $h=0, $link='', $useBoundingBox=true, $align='', $palign='', $border=0, $fitonpage=false, $fixoutvals=false) {
		$file = $this->maintainFilePath($file);
		return parent::ImageEps($file, $x, $y, $w, $h, $link, $useBoundingBox, $align, $palign, $border, $fitonpage, $fixoutvals);
	}

	public function ImageSVG($file, $x='', $y='', $w=0, $h=0, $link='', $align='', $palign='', $border=0, $fitonpage=false) {
		$file = $this->maintainFilePath($file);
		return parent::ImageSVG($file, $x, $y, $w, $h, $link, $align, $palign, $border, $fitonpage);
	}

	// implementation

	private function maintainFilePath($file) {
		$outFile = preg_replace('\'' . JUri::base() . '\'', '', $file);
		if (!@file_exists($outFile)) {
			$outFile = JPATH_ROOT . '/' . $file;
		}
		if (!@file_exists($outFile)) {
			$outFile = JPATH_ROOT. '/images/' . $file;
		}
		if (!@file_exists($outFile)) {
			// tcpdf uses proprietary 'escape' character @ to identify binary images
			$outFile = $this->stripOffImageSourceBase64Identifier($file);
		}
		return $outFile;
	}

	private function stripOffImageSourceBase64Identifier($url) {
		return preg_replace('#^data:image/[a-z^;]+;base64,#i', '@', $url);;
	}

	private function processPageNumberText_byAliasReplacement($text) {
		$text = str_replace('[POP]', $this->getAliasNumPage().' / '.$this->getAliasNbPages(), $text);
		$text = str_replace('[NPS]', $this->getAliasNbPages(), $text);
		$text = str_replace('[PNR]', $this->getAliasNumPage(), $text);
		return $text;
	}

	private function processPageNumberText_byNumber($text) {
		$text = str_replace('[POP]', $this->PageNo().' / '.$this->getNumPages(), $text);
		$text = str_replace('[NPS]', $this->getNumPages(), $text);
		$text = str_replace('[PNR]', $this->PageNo(), $text);
		return $text;
	}

	private function insertBackgroundImage() {
		// get the current page break margin
		$bMargin = $this->getBreakMargin();
		// get current auto-page-break mode
		$auto_page_break = $this->AutoPageBreak;
		// disable auto-page-break
		$this->SetAutoPageBreak(false, 0);
		// set background image: set size according to page format (A1, 2, 3...) and orientation
		if('P' == $this->orientation) {
			$this->Image($this->backgroundImage, 0, 0, $this->pageSize[0], $this->pageSize[1], '', '', '', false, 300, '', false, false, 0);
		}
		else {
			$this->Image($this->backgroundImage, 0, 0, $this->pageSize[1], $this->pageSize[0], '', '', '', false, 300, '', false, false, 0);
		}
		// keep the comment: example line was:
		// $this->Image($this->backgroundImage, 0, 0, 210, 297, '', '', '', false, 300, '', false, false, 0);

		// restore auto-page-break status
		$this->SetAutoPageBreak($auto_page_break, $bMargin);
		// set the starting point for the page content
		$this->setPageMark();
	}
}