<?php

declare(strict_types=1);

namespace App;

use App\Exception\InvalidHashException;
use Hashids\Hashids;
use Hashids\HashidsInterface;

class Hasher
{
    private HashidsInterface $hashids;

    public function __construct(?string $salt = null)
    {
        $salt = $salt ?? 'default_salt';
        $this->hashids = new Hashids($salt, 11);
    }

    public function encode(int $id): string
    {
        return $this->hashids->encode($id);
    }

    /**
     * @throws InvalidHashException
     */
    public function decode(string $hash): int
    {
        $decoded = $this->hashids->decode($hash);
        if (count($decoded) === 0) {
            throw new InvalidHashException('Hash not valid');
        }
        return $decoded[0];
    }

    public function isValid(string $hash): bool
    {
        return count($this->hashids->decode($hash)) !== 0;
    }
}