<?php

declare(strict_types=1);

namespace App\Domain\SmartLink\Services;

use App\Domain\SmartLink\Repositories\SmartLinkRepository;
use App\Domain\SmartLink\ValueObjects\ShortCode;

final readonly class ShortCodeGenerator
{
    private const MAX_ATTEMPTS = 10;

    public function __construct(
        private SmartLinkRepository $repository
    ) {}

    public function generateUnique(int $length = 6): ShortCode
    {
        for ($attempt = 0; $attempt < self::MAX_ATTEMPTS; $attempt++) {
            $shortCode = ShortCode::generate($length);

            if (!$this->repository->existsShortCode($shortCode)) {
                return $shortCode;
            }
        }

        // If we couldn't generate a unique code after MAX_ATTEMPTS, try with longer length
        return $this->generateUnique($length + 1);
    }
}