<?php
/**
 * Class for datasheet and thumbs
 * @link https://github.com/qpdf/qpdf
 * @link https://github.com/coherentgraphics/cpdf-binaries
 * @link https://github.com/mongodb/mongo-php-library
 *
 * @file
 * @ingroup index.php
 * @author Leo
 */
/**
 * Valid web server entry point, enable includes.
 * Please don't move this line to includes/Defines.php. This line essentially
 * defines a valid entry point. If you put it in includes/Defines.php, then
 * any script that includes it becomes an entry point, thereby defeating
 * its purpose.
 */
define( 'NETWORK', true );

// includes MongoDB File
require_once __DIR__ . '/includes/MongoFile.php';

class DataSheet extends MongoFile {

	// datasheet pdf output
	function run() {

		try {
			// BUG: .htaccess RewriteRule Can't Work.
			// FIXME: check file exist
			self::checkFileExist();

			// get query via $_SERVER['REQUEST_URI']
			$query = self::getQuery();

			// MediaWiki URL Redirect
			self::MediaWikiRedirect( $query );

			// get file extension
			$fileext = pathinfo( $query, PATHINFO_EXTENSION );

			// get doc from directorydb.collection
			$doc = self::getDoc( $query );

			// check empty doc
			if ( empty( $doc['pdfmd5'] ) ) {
				throw new Exception( 'PHP Warning: MongoDB document is empty.' );
			}

			// pdf.datasheet.live/*.html
			if ( $fileext == 'html' ) {
				// FIXME: $htmlcache: add http host
				$htmlcache = '/dev/shm/'. $doc['pdfmd5'] .'_'. $doc['_id'] .'_'. strtolower( $_SERVER['HTTP_HOST'] ) .'.html';

				// check file output in cache /dev/shm
				if ( is_file( $htmlcache ) ) {
					// file output by html header
					self::html_header( $htmlcache );
				}

				// create html temp file via mongofs
				$htmltmp = self::createTempFile( $doc['pdfmd5'], $fileext );

				// throw error
				if ( !is_file( $htmltmp ) ) { throw new Exception( 'PHP Warning: MongoDB html is empty.' ); }

				// get base file name
				$basename = str_replace( '.'. $fileext, '', $query );

				// update html to output
				self::update_html_output( $basename, $doc['details'], $htmltmp, $htmlcache );
				exit;
			}

			// pdf.datasheet.live/*.css
			if ( $fileext == 'css' ) {
				$csscache = self::createTempFile( $doc['pdfmd5'], $fileext );
				// check file output in cache /dev/shm
				if ( is_file( $csscache ) ) {
					// file output by html header
					self::html_header( $csscache );
				}
				exit;
			}

			// pdf.datasheet.live/*.txt
			if ( $fileext == 'txt' ) {
				$txtcache = self::createTempFile( $doc['pdfmd5'], $fileext );
				// check file output in cache /dev/shm
				if ( is_file( $txtcache ) ) {
					// file output by html header
					self::html_header( $txtcache );
				}
				exit;
			}

			// pdf.datasheet.live/*.pdf
			if ( $fileext == 'pdf' ) {
				// empty pdfmd5 = (32)0: create_pdf_output
				if ( $doc['pdfmd5'] == str_repeat( '0', 32 ) ) {
					self::create_pdf_output( $doc['details'] );
				}

				// FIXME: $pdfcache: add http host
				$pdfcache = '/dev/shm/'. $doc['pdfmd5'] .'_'. $doc['_id'] .'_'. strtolower( $_SERVER['HTTP_HOST'] ) .'.pdf';

				// check pdf output in cache /dev/shm
				if ( is_file( $pdfcache ) ) {
					// pdf output by browser header
					self::browser_header( $pdfcache );
				}

				// create pdf temp file via mongofs
				$pdftmp = self::createTempFile( $doc['pdfmd5'], $fileext );

				// update pdf info to output
				self::update_pdfinfo_output( $doc['details'], $pdftmp, $pdfcache );
			}

		} catch ( Exception $e ) {
			// error_log exception
			logException( $e );

			// php http location to www home
			self::http_location();
		}
	}

	// create pdf/html head via doc
	static function createHead( $doc ) {
		// FIXME: hash document of Title
		if ( $doc['manufacturer'] == self::getTitle() ) {
			$head['Title']	= self::escape( $doc['model'] .' - '. $doc['manufacturer'] );
		} else {
			$head['Title']	= self::escape( $doc['model'] .' - '. $doc['manufacturer'] .' - '. self::getTitle() );
		}

		$head['Subject']	= self::escape( $doc['description'] .' - '. $doc['model'] );
		$head['Keywords']	= self::escape( $doc['model'] .' - '. $doc['manufacturer'] .' - '. $doc['description'] );
		$head['Author']		= self::escape( $doc['manufacturer'] );
		$head['Creator']	= self::escape( $doc['manufacturer'] );

		return $head;
	}

	/**
	 * update pdf info pdftmp to pdfcache
	 * cpdf stamp, update_info | qpdf linearize
	 *
	 * https://www.coherentpdf.com/cpdfmanual.pdf
	 * https://qpdf.readthedocs.io/en/stable/
	 */
	static function update_pdfinfo_output( $doc, $pdftmp, $pdfcache ) {
		// check pdftmp and file size < 16 MB
		if ( is_file( $pdftmp ) and filesize( $pdftmp ) < 16*1024*1024 ) {

			// check pdf type via qpdf
			if ( self::qpdf_check( $pdftmp ) ) {
				// create pdfinfo.txt
				$head = self::createHead( $doc );

				// get domain via scandir includes/stamp/
				$directory = 'includes/stamp';
				$domain = strtolower( self::getTitle() );
				in_array( $domain .'.pdf', array_diff( scandir( $directory ), array( '..', '.', 'stamp.sh' ) ) ) ? ( $stamp = $domain ) : ( $stamp = 'datasheet.directory' );

				/**
				 * cpdf stamp pdf 1st. page, setting document information
				 * cpdf -cpdflin 'qpdf' linearized pdf
				 *
				 * https://www.php.net/manual/en/function.set-time-limit.php
				 * FIXME: set_time_limit() no work on system()
				 * https://stackoverflow.com/questions/9954794/execute-a-shell-function-with-timeout
				 * timeout 60s * 10
				 */
				system( "timeout 600s cpdf -stamp-on includes/stamp/". $stamp .".pdf ". $pdftmp ." 1 AND -set-title \"". $head['Title'] ."\" AND -set-subject \"". $head['Subject'] ."\" AND -set-keywords \"". $head['Keywords'] ."\" AND -set-author \"". $head['Author'] ."\" AND -set-creator \"". $head['Creator'] ."\" -also-set-xmp AND -cpdflin 'qpdf' -l -o ". $pdfcache, $status );

				// check system status
				if ( !self::qpdf_check( $pdfcache ) ) {
					// cp -f pdf
					system( "cp -f $pdftmp $pdfcache &>/dev/null", $status );
				}

			} else {
				// cp -f pdf
				system( "cp -f $pdftmp $pdfcache &>/dev/null", $status );
			}

			// pdf output by browser header
			self::browser_header( $pdfcache );
		}

		// throw error
		throw new Exception( "PHP Warning: $pdftmp is no exists." );
	}

	// update html to htmlcache
	static function update_html_output( $basename, $doc, $htmltmp, $htmlcache ) {
		// create head via doc
		$head = self::createHead( $doc );

		// create html doc
		$html = '<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8"/>';
		$html .= '<title>'. $head['Title'] .'</title>';
		$html .= '<meta name="keywords" content="'. $head['Keywords'] .'">';
		$html .= '<meta name="description" content="'. $head['Subject'] .'">';
		$html .= '<meta name="author" content="'. $head['Author'] .'">';
		$html .= '<script src="https://fastly.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.min.js"></script>';
		$html .= '<link rel="stylesheet" href="https://fastly.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css">';
		$html .= '<script src="https://fastly.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>';
		$html .= '<link rel="stylesheet" href="https://fastly.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.15.4/css/all.min.css">';
		$html .= '<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/><link rel="stylesheet" type="text/css" href="/images/base.min.css"/><link rel="stylesheet" type="text/css" href="/images/fancy.min.css"/><link rel="shortcut icon" href="/favicon.ico">';
		$html .= '<link rel="stylesheet" type="text/css" href="/'. $basename .'.css"/>';
		$html .= '<link rel="alternate" type="application/pdf" href="/'. $basename .'.pdf"/>';
		$html .= '<link rel="alternate" type="text/plain" href="/'. $basename .'.txt"/>';
		$html .= '<link rel="stylesheet" type="text/css" href="/images/datasheet.css"/>';
		$html .= '<script type="text/javascript" src="/images/compatibility.min.js"></script><script type="text/javascript" src="/images/pdf2htmlEX.min.js"></script><script>try{pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});}catch(e){}</script></head><body><div id="sidebar"><div id="outline"></div></div>';
		$html .= file_get_contents( $htmltmp );
		$html .= '<div class="loading-indicator"></div>';

		// add download pdf icon by Chrome: Developer Tools
		$html .= '<div class="download-pdf"><a target="_blank" href="/'. $basename .'.pdf"><i class="fas fa-file-pdf fa-4x" style="color:red;"></i></a></div>';

		// datasheet quote for no bot
		if ( !self::bot_detection() ) {
			// @product: insert HTMLForm.php via /mnt/iiic/product
			include_once( '/mnt/iiic/product/includes/htmlform/HTMLForm.php' );
			$html .= get_contact_modal();

			//IMP: zoom body
			$html .= '<script type="text/javascript">ratio = document.body.clientWidth / document.querySelector(".w0").offsetWidth; document.getElementById("page-container").style.zoom = ratio;</script>';
			// product: plugin.min.js
			$html .= '<script type="text/javascript">'. file_get_contents( '/mnt/iiic/product/resources/plugin.min.js' ) .'</script>';
			$html .= '<script type="text/javascript">$(document).ready(function(){ $("#inquiry").modal("show"); onSet("", "https://'. $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] .'"); });</script>';
		}

		// end html
		$html .= '</body></html>';
		file_put_contents( $htmlcache, $html );

		// FIXME: PHP Warning:  unlink No such file
		@unlink( $htmltmp );

		// file output by html header
		self::html_header( $htmlcache );
	}

	// pdfmd5 = (32)0: create_pdf_output
	static function create_pdf_output( $doc ) {
		// https://mpdf.github.io/fonts-languages/choosing-a-configuration-v7-x.html
		// to use core fonts only, use 'c' for the mode configuration key:
		$mpdf = new \Mpdf\Mpdf( [ 'mode' => 'c', 'default_font_size' => 15, 'tempDir' => '/dev/shm' ] );

		// 4th | %PDF1.5 | 6.x
		$mpdf->pdf_version = '1.5';

		// doc.details
		$model = $doc['model'];
		$manufacturer = $doc['manufacturer'];
		$description = $doc['description'];
		$datasheet_link = 'https://www.datasheet.live/'. rawurlencode( $model ) .'-datasheet.html';
		$product_link = 'https://www.product.network/'. rawurlencode( $model ) .'-product.html';

		// document metadata
		$mpdf->SetTitle( $_SERVER['HTTP_HOST'] .' '. $model );
		$mpdf->SetAuthor( $_SERVER['HTTP_HOST'] );
		$mpdf->SetCreator( $_SERVER['HTTP_HOST'] );
		$mpdf->SetSubject( $_SERVER['HTTP_HOST'] );
		$mpdf->SetKeywords( $_SERVER['HTTP_HOST'] .' '. $description );

		// define an html headers/footers
		$mpdf->defaultheaderfontsize = 12;
		$mpdf->defaultfooterfontsize = 12;
		$mpdf->SetHeader( '| '. $model .' |' );
		$mpdf->SetFooter( '&copy; {DATE Y} | https://'. strtolower( $_SERVER['HTTP_HOST'] .' |' ) );

		// https://www.php.net/manual/en/function.file-get-contents.php
		// https://www.jsdelivr.com/package/npm/bootstrap
		$stylesheet = file_get_contents( __DIR__ . '/images/mpdf.css' );
		$mpdf->WriteHTML( $stylesheet, \Mpdf\HTMLParserMode::HEADER_CSS );

		// html content body
		// https://mpdf.github.io/css-stylesheets/supported-css.html#common-text-styles
		$html = <<<EOF
<div class="container-fixed">
	<h1>$model</h1>
	<h2>$manufacturer</h2>
	<h3>$description</h3>
	<div class="footer-link">
		<h5><a target="_blank" href="$datasheet_link">$datasheet_link</a></h5>
		<h5><a target="_blank" href="$product_link">$product_link</a></h5>
	</div>
</div>
EOF;
		$mpdf->WriteHTML( $html, \Mpdf\HTMLParserMode::HTML_BODY );

		// Adobe Portable Document Format (PDF)
		header( 'Content-Type: application/pdf' );

		// output a pdf file directly to the browser
		$mpdf->Output();
		exit;
	}
}

// index.php pdf output
$datasheet = new DataSheet();
$datasheet->run();