<?php
/* Copyright (C) 2004-2016 Laurent Destailleur     <eldy@users.sourceforge.net>
 * Copyright (C) 2004-2010 Folke Ashberg: Some lines of code were inspired from work
 *                         of Folke Ashberg into PHP-Barcode 0.3pl2, available as GPL
 *                         source code at http://www.ashberg.de/bar.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

/**
 *	\file       htdocs/core/lib/barcode.lib.php
 *	\brief      Set of functions used for barcode generation (internal lib, also code 'phpbarcode')
 *	\ingroup    core
 */

/* ******************************************************************** */
/*                          COLORS                                      */
/* ******************************************************************** */
$bar_color = array(0, 0, 0);
$bg_color = array(255, 255, 255);
$text_color = array(0, 0, 0);


/* ******************************************************************** */
/*                          FONT FILE                                   */
/* ******************************************************************** */
if (defined('DOL_DEFAULT_TTF_BOLD')) {
	$font_loc = constant('DOL_DEFAULT_TTF_BOLD');
}
// Automatic-Detection of Font if running Windows
// @CHANGE LDR
if (isset($_SERVER['WINDIR']) && @file_exists($_SERVER['WINDIR'])) {
	$font_loc = $_SERVER['WINDIR'].'\Fonts\arialbd.ttf';
}
if (empty($font_loc)) {
	die('DOL_DEFAULT_TTF_BOLD must de defined with full path to a TTF font.');
}


/* ******************************************************************** */
/*                          GENBARCODE                                  */
/* ******************************************************************** */
/* location of 'genbarcode'
 * leave blank if you don't have them :(
* genbarcode is needed to render encodings other than EAN-12/EAN-13/ISBN
*/

if (defined('PHP-BARCODE_PATH_COMMAND')) {
	$genbarcode_loc = constant('PHP-BARCODE_PATH_COMMAND');
} else {
	$genbarcode_loc = '';
	if (!empty($conf->global->GENBARCODE_LOCATION)) {
		$genbarcode_loc = $conf->global->GENBARCODE_LOCATION;
	}
}




/**
 * Print barcode
 *
 * @param	string	       $code		Code
 * @param	string	       $encoding	Encoding ('EAN13', 'ISBN', 'C128', 'UPC', 'CBR', 'QRCODE', 'DATAMATRIX', 'ANY'...)
 * @param	integer	       $scale		Scale
 * @param	string	       $mode		'png' or 'jpg' ...
 * @return	array|string   $bars		array('encoding': the encoding which has been used, 'bars': the bars, 'text': text-positioning info) or string with error message
 */
function barcode_print($code, $encoding = "ANY", $scale = 2, $mode = "png")
{
	dol_syslog("barcode.lib.php::barcode_print $code $encoding $scale $mode");

	$bars = barcode_encode($code, $encoding);
	if (!$bars || !empty($bars['error'])) {
		// Return error message instead of array
		if (empty($bars['error'])) {
			$error = 'Bad Value '.$code.' for encoding '.$encoding;
		} else {
			$error = $bars['error'];
		}
		dol_syslog('barcode.lib.php::barcode_print '.$error, LOG_ERR);
		return $error;
	}
	if (!$mode) {
		$mode = "png";
	}
	//if (preg_match("/^(text|txt|plain)$/i",$mode)) print barcode_outtext($bars['text'],$bars['bars']);
	//elseif (preg_match("/^(html|htm)$/i",$mode)) print barcode_outhtml($bars['text'],$bars['bars'], $scale,0, 0);
	//else
	barcode_outimage($bars['text'], $bars['bars'], $scale, $mode);
	return $bars;
}

/**
 * Encodes $code with $encoding using genbarcode OR built-in encoder if you don't have genbarcode only EAN-13/ISBN or UPC is possible
 *
 * You can use the following encodings (when you have genbarcode):
 *   ANY    choose best-fit (default)
 *   EAN    8 or 13 EAN-Code
 *   UPC    12-digit EAN
 *   ISBN   isbn numbers (still EAN-13)
 *   39     code 39
 *   128    code 128 (a,b,c: autoselection)
 *   128C   code 128 (compact form for digits)
 *   128B   code 128, full printable ascii
 *   I25    interleaved 2 of 5 (only digits)
 *   128RAW Raw code 128 (by Leonid A. Broukhis)
 *   CBR    Codabar (by Leonid A. Broukhis)
 *   MSI    MSI (by Leonid A. Broukhis)
 *   PLS    Plessey (by Leonid A. Broukhis)
 *
 * @param	string	$code		Code
 * @param	string	$encoding	Encoding
 * @return	array|false			array('encoding': the encoding which has been used, 'bars': the bars, 'text': text-positioning info)
 */
function barcode_encode($code, $encoding)
{
	global $genbarcode_loc;

	if ((preg_match("/^upc$/i", $encoding))
	&& (preg_match("/^[0-9]{11,12}$/", $code))
	) {
		/* use built-in UPC-Encoder */
		dol_syslog("barcode.lib.php::barcode_encode Use barcode_encode_upc");
		$bars = barcode_encode_upc($code, $encoding);
	} elseif ((preg_match("/^ean$/i", $encoding))

	|| (($encoding) && (preg_match("/^isbn$/i", $encoding))
	&& ((strlen($code) == 9 || strlen($code) == 10) ||
	(((preg_match("/^978/", $code) && strlen($code) == 12) ||
	(strlen($code) == 13)))))

	|| ((!isset($encoding) || !$encoding || (preg_match("/^ANY$/i", $encoding)))
	&& (preg_match("/^[0-9]{12,13}$/", $code)))
	) {
		/* use built-in EAN-Encoder */
		dol_syslog("barcode.lib.php::barcode_encode Use barcode_encode_ean");
		$bars = barcode_encode_ean($code, $encoding);
	} elseif (file_exists($genbarcode_loc)) {	// For example C39
		/* use genbarcode */
		dol_syslog("barcode.lib.php::barcode_encode Use genbarcode ".$genbarcode_loc." code=".$code." encoding=".$encoding);
		$bars = barcode_encode_genbarcode($code, $encoding);
	} else {
		print "barcode_encode needs an external program for encodings other then EAN/ISBN (code=".dol_escape_htmltag($code).", encoding=".dol_escape_htmltag($encoding).")<BR>\n";
		print "<UL>\n";
		print "<LI>download gnu-barcode from <A href=\"https://www.gnu.org/software/barcode/\">www.gnu.org/software/barcode/</A>\n";
		print "<LI>compile and install them\n";
		print "<LI>specify path the genbarcode in barcode module setup\n";
		print "</UL>\n";
		print "<BR>\n";
		return false;
	}

	return $bars;
}


/**
 * Calculate EAN sum
 *
 * @param	string	$ean	EAN to encode
 * @return	integer			Sum
 */
function barcode_gen_ean_sum($ean)
{
	$even = true;
	$esum = 0;
	$osum = 0;
	$ln = strlen($ean) - 1;
	for ($i = $ln; $i >= 0; $i--) {
		if ($even) {
			$esum += $ean[$i];
		} else {
			$osum += $ean[$i];
		}
		$even = !$even;
	}
	return (10 - ((3 * $esum + $osum) % 10)) % 10;
}


/**
 * Generate EAN bars
 *
 * @param	string	$ean	EAN to encode
 * @return	string			Encoded EAN
 */
function barcode_gen_ean_bars($ean)
{
	$digits = array(3211, 2221, 2122, 1411, 1132, 1231, 1114, 1312, 1213, 3112);
	$mirror = array("000000", "001011", "001101", "001110", "010011", "011001", "011100", "010101", "010110", "011010");
	$guards = array("9a1a", "1a1a1", "a1a7");

	$line = $guards[0];
	for ($i = 1; $i < 13; $i++) {
		$str = $digits[$ean[$i]];
		if ($i < 7 && $mirror[$ean[0]][$i - 1] == 1) {
			$line .= strrev($str);
		} else {
			$line .= $str;
		}
		if ($i == 6) {
			$line .= $guards[1];
		}
	}
	$line .= $guards[2];

	return $line;
}

/**
 * Encode EAN
 *
 * @param	string	$ean		Code
 * @param	string	$encoding	Encoding
 * @return	array				array('encoding': the encoding which has been used, 'bars': the bars, 'text': text-positioning info, 'error': error message if error)
 */
function barcode_encode_ean($ean, $encoding = "EAN-13")
{
	$ean = trim($ean);
	if (preg_match("/[^0-9]/i", $ean)) {
		return array("error"=>"Invalid encoding/code. encoding=".$encoding." code=".$ean." (not a numeric)", "text"=>"Invalid encoding/code. encoding=".$encoding." code=".$ean." (not a numeric)");
	}
	$encoding = strtoupper($encoding);
	if ($encoding == "ISBN") {
		if (!preg_match("/^978/", $ean)) {
			$ean = "978".$ean;
		}
	}
	if (preg_match("/^97[89]/", $ean)) {
		$encoding = "ISBN";
	}
	if (strlen($ean) < 12 || strlen($ean) > 13) {
		return array("error"=>"Invalid encoding/code. encoding=".$encoding." code=".$ean." (must have 12/13 numbers)", "text"=>"Invalid encoding/code. encoding=".$encoding." code=".$ean." (must have 12/13 numbers)");
	}

	$ean = substr($ean, 0, 12);
	$eansum = barcode_gen_ean_sum($ean);
	$ean .= $eansum;
	$bars = barcode_gen_ean_bars($ean);

	/* create text */
	$pos = 0;
	$text = "";
	for ($a = 0; $a < 13; $a++) {
		if ($a > 0) {
			$text .= " ";
		}
		$text .= "$pos:12:{$ean[$a]}";
		if ($a == 0) {
			$pos += 12;
		} elseif ($a == 6) {
			$pos += 12;
		} else {
			$pos += 7;
		}
	}

	return array(
		"error" => '',
		"encoding" => $encoding,
		"bars" => $bars,
		"text" => $text
	);
}

/**
 * Encode UPC
 *
 * @param	string	$upc		Code
 * @param	string	$encoding	Encoding
 * @return	array				array('encoding': the encoding which has been used, 'bars': the bars, 'text': text-positioning info, 'error': error message if error)
 */
function barcode_encode_upc($upc, $encoding = "UPC")
{
	$upc = trim($upc);
	if (preg_match("/[^0-9]/i", $upc)) {
		return array("error"=>"Invalid encoding/code. encoding=".$encoding." code=".$upc." (not a numeric)", "text"=>"Invalid encoding/code. encoding=".$encoding." code=".$upc." (not a numeric)");
	}
	$encoding = strtoupper($encoding);
	if (strlen($upc) < 11 || strlen($upc) > 12) {
		return array("error"=>"Invalid encoding/code. encoding=".$encoding." code=".$upc." (must have 11/12 numbers)", "text"=>"Invalid encoding/code. encoding=".$encoding." code=".$upc." (must have 11/12 numbers)");
	}

	$upc = substr("0".$upc, 0, 12);
	$eansum = barcode_gen_ean_sum($upc);
	$upc .= $eansum;
	$bars = barcode_gen_ean_bars($upc);

	/* create text */
	$pos = 0;
	$text = "";
	for ($a = 1; $a < 13; $a++) {
		if ($a > 1) {
			$text .= " ";
		}
		$text .= "$pos:12:{$upc[$a]}";
		if ($a == 1) {
			$pos += 15;
		} elseif ($a == 6) {
			$pos += 17;
		} elseif ($a == 11) {
			$pos += 15;
		} else {
			$pos += 7;
		}
	}

	return array(
		"error" => '',
		"encoding" => $encoding,
		"bars" => $bars,
		"text" => $text
	);
}

/**
 * Encode result of genbarcode command
 *
 * @param	string	$code		Code
 * @param	string	$encoding	Encoding
 * @return	array|false			array('encoding': the encoding which has been used, 'bars': the bars, 'text': text-positioning info)
 */
function barcode_encode_genbarcode($code, $encoding)
{
	global $genbarcode_loc;

	// Clean parameters
	if (preg_match("/^ean$/i", $encoding) && strlen($code) == 13) {
		$code = substr($code, 0, 12);
	}
	if (!$encoding) {
		$encoding = "ANY";
	}
	$encoding = preg_replace("/[\\\|]/", "_", $encoding);
	$code = preg_replace("/[\\\|]/", "_", $code);

	$command = escapeshellarg($genbarcode_loc);
	//$paramclear=" \"".str_replace("\"", "\\\"",$code)."\" \"".str_replace("\"", "\\\"",strtoupper($encoding))."\"";
	$paramclear = " ".escapeshellarg($code)." ".escapeshellarg(strtoupper($encoding));

	$fullcommandclear = $command." ".$paramclear." 2>&1";
	//print $fullcommandclear."<br>\n";exit;

	dol_syslog("Run command ".$fullcommandclear);
	$fp = popen($fullcommandclear, "r");
	if ($fp) {
		$bars = fgets($fp, 1024);
		$text = fgets($fp, 1024);
		$encoding = fgets($fp, 1024);
		pclose($fp);
	} else {
		dol_syslog("barcode.lib.php::barcode_encode_genbarcode failed to run popen ".$fullcommandclear, LOG_ERR);
		return false;
	}
	//var_dump($bars);
	$ret = array(
		"bars" => trim($bars),
		"text" => trim($text),
		"encoding" => trim($encoding),
		"error" => ""
	);
	//var_dump($ret);
	if (preg_match('/permission denied/i', $ret['bars'])) {
		$ret['error'] = $ret['bars'];
		$ret['bars'] = '';
		return $ret;
	}
	if (!$ret['bars']) {
		return false;
	}
	if (!$ret['text']) {
		return false;
	}
	if (!$ret['encoding']) {
		return false;
	}
	return $ret;
}

/**
 * Output image onto standard output, or onto disk if global filebarcode is defined
 *
 * @param	string	$text		the text-line (<position>:<font-size>:<character> ...)
 * @param	string	$bars   	where to place the bars  (<space-width><bar-width><space-width><bar-width>...)
 * @param	int		$scale		scale factor ( 1 < scale < unlimited (scale 50 will produce 5400x300 pixels when using EAN-13!!!))
 * @param	string	$mode   	png,gif,jpg (default='png')
 * @param	int		$total_y	the total height of the image ( default: scale * 60 )
 * @param	array	$space		default:  $space[top]   = 2 * $scale; $space[bottom]= 2 * $scale;  $space[left]  = 2 * $scale;  $space[right] = 2 * $scale;
 * @return	string|null
 */
function barcode_outimage($text, $bars, $scale = 1, $mode = "png", $total_y = 0, $space = '')
{
	global $bar_color, $bg_color, $text_color;
	global $font_loc, $filebarcode;

	//print "$text, $bars, $scale, $mode, $total_y, $space, $font_loc, $filebarcode<br>";
	//var_dump($text);
	//var_dump($bars);
	//var_dump($font_loc);

	/* set defaults */
	if ($scale < 1) {
		$scale = 2;
	}
	$total_y = (int) $total_y;
	if ($total_y < 1) {
		$total_y = (int) $scale * 60;
	}
	if (!$space) {
		$space = array('top'=>2 * $scale, 'bottom'=>2 * $scale, 'left'=>2 * $scale, 'right'=>2 * $scale);
	}

	/* count total width */
	$xpos = 0;
	$width = true;
	$ln = strlen($bars);
	for ($i = 0; $i < $ln; $i++) {
		$val = strtolower($bars[$i]);
		if ($width) {
			$xpos += $val * $scale;
			$width = false;
			continue;
		}
		if (preg_match("/[a-z]/", $val)) {
			/* tall bar */
			$val = ord($val) - ord('a') + 1;
		}
		$xpos += $val * $scale;
		$width = true;
	}

	/* allocate the image */
	$total_x = ($xpos) + $space['right'] + $space['right'];
	$xpos = $space['left'];
	if (!function_exists("imagecreate")) {
		print "You don't have the gd2 extension enabled<br>\n";
		return "";
	}
	$im = imagecreate($total_x, $total_y);
	/* create two images */
	$col_bg = ImageColorAllocate($im, $bg_color[0], $bg_color[1], $bg_color[2]);
	$col_bar = ImageColorAllocate($im, $bar_color[0], $bar_color[1], $bar_color[2]);
	$col_text = ImageColorAllocate($im, $text_color[0], $text_color[1], $text_color[2]);
	$height = round($total_y - ($scale * 10));
	$height2 = round($total_y - $space['bottom']);

	/* paint the bars */
	$width = true;
	$ln = strlen($bars);
	for ($i = 0; $i < $ln; $i++) {
		$val = strtolower($bars[$i]);
		if ($width) {
			$xpos += $val * $scale;
			$width = false;
			continue;
		}
		if (preg_match("/[a-z]/", $val)) {
			/* tall bar */
			$val = ord($val) - ord('a') + 1;
			$h = $height2;
		} else {
			$h = $height;
		}
		imagefilledrectangle($im, $xpos, $space['top'], $xpos + ($val * $scale) - 1, $h, $col_bar);
		$xpos += $val * $scale;
		$width = true;
	}

	$chars = explode(" ", $text);
	foreach ($chars as $v) {
		if (trim($v)) {
			$inf = explode(":", $v);
			$fontsize = $scale * ($inf[1] / 1.8);
			$fontheight = $total_y - ($fontsize / 2.7) + 2;
			imagettftext($im, $fontsize, 0, $space['left'] + ($scale * $inf[0]) + 2, $fontheight, $col_text, $font_loc, $inf[2]);
		}
	}

	/* output the image */
	$mode = strtolower($mode);
	if ($mode == 'jpg' || $mode == 'jpeg') {
		header("Content-Type: image/jpeg; name=\"barcode.jpg\"");
		imagejpeg($im);
	} elseif ($mode == 'gif') {
		header("Content-Type: image/gif; name=\"barcode.gif\"");
		imagegif($im);
	} elseif (!empty($filebarcode)) {
		// To wxrite into  afile onto disk
		imagepng($im, $filebarcode);
	} else {
		header("Content-Type: image/png; name=\"barcode.png\"");
		imagepng($im);
	}
}