<?php

declare(strict_types=1);

namespace App\Service\Utils;

use App\Entity\Core\File;
use Exception;
use Mimey\MimeTypes;
use RuntimeException;

class FileUtils
{
    public function __construct()
    {
    }

    /**
     * Return the mimetype corresponding to the givent file extension.
     */
    public function getMimeTypeFromExt(string $ext): ?string
    {
        return (new MimeTypes())->getMimeType(ltrim($ext, '.'));
    }

    /**
     * Try to guess the mimetype from the filename.
     *
     * Return null if it did not manage to guess it.
     */
    public function guessMimeTypeFromFilename(string $filename): ?string
    {
        $ext = pathinfo($filename, PATHINFO_EXTENSION);
        if (empty($ext)) {
            return null;
        }

        return self::getMimeTypeFromExt($ext);
    }

    /**
     * Test si le fichier passé en paramètre est une image.
     */
    public function isImage(File $file): bool
    {
        $mimetype = $file->getMimeType() ?: $this->guessMimeTypeFromFilename($file->getName());

        return boolval(preg_match('#^image#', $mimetype));
    }

    /**
     * Génère un nom de fichier temporaire situé dans le répertoire var/tmp,
     * avec l'extension et le préfixe donnés.
     *
     * @param string $ext
     * @param string $prefix
     * @return string
     * @throws RuntimeException
     */
    public function getTempFilename(string $ext = 'tmp', string $prefix = ''): string
    {
        if (empty($ext)) {
            throw new RuntimeException('Extension can not be empty');
        }
        $tempDir = Path::getProjectDir() . '/var/tmp';
        if (!is_dir($tempDir)) {
            mkdir($tempDir);
        }
        return $tempDir . '/' . $prefix . uniqid() . '.' . $ext;
    }
}