<?php
namespace Pulsestorm\Magento2\Cli\Extract_Session;
use function Pulsestorm\Pestle\Importer\pestle_import;
pestle_import('Pulsestorm\Pestle\Library\input');
pestle_import('Pulsestorm\Pestle\Library\output');

class Session
{
    public static function unserialize($session_data) {
        $method = ini_get("session.serialize_handler");
        switch ($method) {
            case "php":
                return self::unserialize_php($session_data);
                break;
            case "php_binary":
                return self::unserialize_phpbinary($session_data);
                break;
            default:
                throw new Exception("Unsupported session.serialize_handler: " . $method . ". Supported: php, php_binary");
        }
    }

    private static function unserialize_php($session_data) {
        $return_data = array();
        $offset = 0;
        while ($offset < strlen($session_data)) {
            if (!strstr(substr($session_data, $offset), "|")) {
                throw new Exception("invalid data, remaining: " . substr($session_data, $offset));
            }
            $pos = strpos($session_data, "|", $offset);
            $num = $pos - $offset;
            $varname = substr($session_data, $offset, $num);
            $offset += $num + 1;
            $data = unserialize(substr($session_data, $offset));
            $return_data[$varname] = $data;
            $offset += strlen(serialize($data));
        }
        return $return_data;
    }

    private static function unserialize_phpbinary($session_data) {
        $return_data = array();
        $offset = 0;
        while ($offset < strlen($session_data)) {
            $num = ord($session_data[$offset]);
            $offset += 1;
            $varname = substr($session_data, $offset, $num);
            $offset += $num;
            $data = unserialize(substr($session_data, $offset));
            $return_data[$varname] = $data;
            $offset += strlen(serialize($data));
        }
        return $return_data;
    }
}

/**
* ALPHA: Extracts data from a saved PHP session file
* @command php:extract-session
*/
function pestle_cli($argv)
{
    $contents = file_get_contents($argv[0]);
    // echo $contents;
    
    $array    = Session::unserialize($contents);    
    var_dump($array);
    output("Foo");
}