<?php

namespace App\Service;

use Hashids\Hashids;

class HashGenerator
{
    // TODO: set in env file and set in constructor
    protected $salt = 'salt that should be in the env file 230498';
    protected $length = 15;

    public function getHash($id)
    {
        $hi = new Hashids($this->salt, $this->length);
        return $hi->encode($id);
    }

    public function getID($hash)
    {
        $hi = new Hashids($this->salt, $this->length);
        $id_array = $hi->decode($hash);

        // return null if unable to decode aka invalid hash
        if (empty($id_array))
            return null;

        // first one should be the id
        return $id_array[0];
    }
}