<?php
declare(strict_types=1);

use Illuminate\Process\Factory;

final class CsvCheck
{
    public function __construct(
        private Factory $processes,
        private string $validator = __DIR__.'/validate-csv.php',
    ) {}

    public function rows(string $csv): int
    {
        if (strlen($csv) > 65536) {
            throw new LengthException('CSV exceeds the example input limit');
        }
        $result = $this->processes->input($csv)->timeout(1)
            ->run([PHP_BINARY, $this->validator])->throw();
        $data = json_decode($result->output(), true, flags: JSON_THROW_ON_ERROR);
        if (!is_array($data) || array_keys($data) !== ['rows'] || !is_int($data['rows']) || $data['rows'] < 0) {
            throw new UnexpectedValueException('Invalid validator response');
        }
        return $data['rows'];
    }
}