<?php namespace Tps\Shops\Classes;

    /**
     * Class Extractor
     *
     * Extract a archive (zip/gzip/rar) file.
     * 
     * @author niceshipest
     * 
     */
    class Extractor{
        
        /**
         * Checks file extension and calls suitable extractor functions.
         *
         * @param $archive
         * @param $destination
         */
        public static function extract($archive, $destination){
            $ext = pathinfo($archive, PATHINFO_EXTENSION);
            switch ($ext){
                case 'zip':
                    $res = self::extractZipArchive($archive, $destination);
                    break;
                case 'gz':

                    $res = self::extractGzipFile($archive, $destination);
                    break;
                case 'rar':

                $res = self::extractRarArchive($archive, $destination);
                break;
            }

            return $res;
        }

        /**
         * Decompress/extract a zip archive using ZipArchive.
         *
         * @param $archive
         * @param $destination
         */
        public static function extractZipArchive($archive, $destination){
            // Check if webserver supports unzipping.
            if(!class_exists('ZipArchive')){
                $GLOBALS['status'] = array('error' => 'Your PHP version does not support unzip functionality.');
                return false;
            }
        
            $zip = new \ZipArchive;
        
            // Check if archive is readable.
            if($zip->open($archive) === TRUE){
                // Check if destination is writable
                if(is_writeable($destination . '/')){
                    $zip->extractTo($destination);
                    $zip->close();
                    $GLOBALS['status'] = array('success' => 'Files unzipped successfully');
                    return true;
                }else{
                    $GLOBALS['status'] = array('error' => 'Directory not writeable by webserver.');
                    return false;
                }
            }else{
                $GLOBALS['status'] = array('error' => 'Cannot read .zip archive.');
                return false;
            }
        }

        /**
         * Decompress a .gz File.
         *
         * @param $archive
         * @param $destination
         */
        public static function extractGzipFile($archive, $destination){
            // Check if zlib is enabled
            if(!function_exists('gzopen')){
                $GLOBALS['status'] = array('error' => 'Error: Your PHP has no zlib support enabled.');
                return false;
            }
        
            $filename = pathinfo($archive, PATHINFO_FILENAME);
            $gzipped = gzopen($archive, "rb");

            $file = fopen($filename, "w");
        
            while ($string = gzread($gzipped, 4096)) {
                fwrite($file, $string, strlen($string));
            }
            gzclose($gzipped);

            fclose($file);
        
            // Check if file was extracted.
            if(file_exists($destination.'/'.$filename)){
                $GLOBALS['status'] = array('success' => 'File unzipped successfully.');
                return true;
            }else{
                $GLOBALS['status'] = array('error' => 'Error unzipping file.');
                return false;
            }
        }

        /**
         * Decompress/extract a Rar archive using RarArchive.
         *
         * @param $archive
         * @param $destination
         */
        public static function extractRarArchive($archive, $destination){
            // Check if webserver supports unzipping.
            if(!class_exists('RarArchive')){
                $GLOBALS['status'] = array('error' => 'Your PHP version does not support .rar archive functionality.');
                return false;
            }
            // Check if archive is readable.
            if($rar = \RarArchive::open($archive)){

                // Check if destination is writable
                if (is_writeable($destination . '/')) {
                    $entries = $rar->getEntries();
                    foreach ($entries as $entry) {
                        $entry->extract($destination);
                    }
                    $rar->close();
                    $GLOBALS['status'] = array('success' => 'File extracted successfully.');
                    return true;
                }else{
                    $GLOBALS['status'] = array('error' => 'Directory not writeable by webserver.');
                    return false;
                }
            }else{
                $GLOBALS['status'] = array('error' => 'Cannot read .rar archive.');
                return false;
            }
        }
        
    }
?>