<?php
class pdftkMerger {

	private $localPdftk;
	private $tmpDir;

	public function __construct($pdftk = '/usr/bin/pdftk', $tmp = '/tvitemp/tmp') {
		$this->localPdftk = $pdftk;
		$this->tmpDir = $tmp;
	}

	private function getFileData($file) {
		$downloadFile = fopen($file, 'r');
		if ($downloadFile) {
			$buf = "";
	        	while(!feof($downloadFile)) {
        			$buf .= fread($downloadFile, 1024 * 8);
        		}
        		fclose($downloadFile);
		}
		return $buf;
	}

	private function getReportInfo($report) {
		$command = $this->localPdftk.' '.$report.' dump_data output '.$this->tmpDir.'/report.txt';
		exec($command);
		$info = $this->getFileData($this->tmpDir.'/report.txt');
		unlink($this->tmpDir.'/report.txt');
		return $info;
	}

	private function getPageAmount($pdfInfo) {
		preg_match('/NumberOfPages: ([0-9]{1,})/', $pdfInfo, $matches);
		return $matches[1];
	}

	public function getMergedPdf($original, $attachments) {
		if(count($attachments) > 0) {
			$originalInfo = $this->getReportInfo($original);
			$pageAmount = $this->getPageAmount($originalInfo);
			$pageAmount++;
			$mergedInfo = $originalInfo."\nBookmarkBegin\nBookmarkTitle: Verplichte bijlagen\nBookmarkLevel: 1\nBookmarkPageNumber: ".$pageAmount;

			$mergeCommand = $this->localPdftk.' '.$original;
			foreach($attachments AS $name => $path) {
				$mime_type = mime_content_type($path);
				switch ($mime_type) {
                			case 'application/pdf':
                    			case 'application/octet-stream':
                        			$mergeCommand .= ' '.$path;
						$mergedInfo .= "\nBookmarkBegin\nBookmarkTitle: ".$name."\nBookmarkLevel: 2\nBookmarkPageNumber: ".$pageAmount;
						$pageAmount = $pageAmount + $this->getPageAmount($this->getReportInfo($path));
                        			break;
                    			default:
                        			continue;
                		}
			}
			$mergeCommand .= ' cat output '.$this->tmpDir.'/_taxatierapportMerged.pdf';
			exec($mergeCommand);

			$fh = fopen($this->tmpDir.'/mergedInfo.txt', 'w');
                	fwrite($fh,$mergedInfo);
                	fclose($fh);

			$updateInfoCommand = $this->localPdftk.' '.$this->tmpDir.'/_taxatierapportMerged.pdf update_info '.$this->tmpDir.'/mergedInfo.txt output '.$this->tmpDir.'/complete.pdf';
			exec($updateInfoCommand);
			$pdf = $this->getFileData($this->tmpDir.'/complete.pdf');

			unlink($this->tmpDir.'/_taxatierapportMerged.pdf');
			unlink($this->tmpDir.'/mergedInfo.txt');
			unlink($this->tmpDir.'/complete.pdf');

			return $pdf;
		}
	}
}

$merger = new pdftkMerger();

$tmpDir = "/tvitemp/tmp";
$original = "_test.pdf";

$attachments = array(
	'opdrachtvoorwaarden' => $tmpDir.'/test.pdf',
	'CRT' => $tmpDir.'/test.pdf',
);

header("Content-type:application/pdf");
echo $merger->getMergedPdf($tmpDir.'/'.$original, $attachments);
die();
?>