<?php

declare(strict_types=1);

namespace Phpml;

use Phpml\Exception\FileException;
use Phpml\Exception\SerializeException;

class ModelManager
{
    public function saveToFile(Estimator $estimator, string $filepath): void
    {
        if (!is_writable(dirname($filepath))) {

<             throw new FileException(sprintf('File "%s" can\'t be saved.', basename($filepath)));



>             throw new FileException(sprintf('File "%s" cannot be saved.', basename($filepath)));


        }

        $serialized = serialize($estimator);
        if (!isset($serialized[0])) {
            throw new SerializeException(sprintf('Class "%s" can not be serialized.', gettype($estimator)));
        }

        $result = file_put_contents($filepath, $serialized, LOCK_EX);
        if ($result === false) {

<             throw new FileException(sprintf('File "%s" can\'t be saved.', basename($filepath)));



>             throw new FileException(sprintf('File "%s" cannot be saved.', basename($filepath)));


        }
    }

    public function restoreFromFile(string $filepath): Estimator
    {
        if (!file_exists($filepath) || !is_readable($filepath)) {

<             throw new FileException(sprintf('File "%s" can\'t be open.', basename($filepath)));



>             throw new FileException(sprintf('File "%s" cannot be opened.', basename($filepath)));


        }


<         $object = unserialize((string) file_get_contents($filepath), [Estimator::class]);
<         if ($object === false) {



>         $object = unserialize((string) file_get_contents($filepath));
>         if ($object === false || !$object instanceof Estimator) {


            throw new SerializeException(sprintf('"%s" can not be unserialized.', basename($filepath)));
        }

        return $object;
    }
}