class Psr4DirectoryLoader

final class Psr4DirectoryLoader extends Loader implements DirectoryAwareLoaderInterface {
    private ?string $currentDirectory = null;
    public function __construct(FileLocatorInterface $locator) {
        // PSR-4 directory loader has no env-aware logic, so we drop the $env constructor parameter.
        parent::__construct();
    }
    
    /**
     * @param array{path: string, namespace: string} $resource
     */
    public function load(mixed $resource, ?string $type = null) : ?RouteCollection {
        $path = $this->locator
            ->locate($resource['path'], $this->currentDirectory);
        if (!is_dir($path)) {
            return new RouteCollection();
        }
        return $this->loadFromDirectory($path, trim($resource['namespace'], '\\'));
    }
    public function supports(mixed $resource, ?string $type = null) : bool {
        return 'attribute' === $type && \is_array($resource) && isset($resource['path'], $resource['namespace']);
    }
    public function forDirectory(string $currentDirectory) : static {
        $loader = clone $this;
        $loader->currentDirectory = $currentDirectory;
        return $loader;
    }
    private function loadFromDirectory(string $directory, string $psr4Prefix) : RouteCollection {
        $collection = new RouteCollection();
        $collection->addResource(new DirectoryResource($directory, '/\\.php$/'));
        $files = iterator_to_array(new \RecursiveIteratorIterator(new \RecursiveCallbackFilterIterator(new \RecursiveDirectoryIterator($directory, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS), fn(\SplFileInfo $current) => !str_starts_with($current->getBasename(), '.')), \RecursiveIteratorIterator::SELF_FIRST));
        usort($files, fn(\SplFileInfo $a, \SplFileInfo $b) => (string) $a > (string) $b ? 1 : -1);
        
        /** @var \SplFileInfo $file */
        foreach ($files as $file) {
            if ($file->isDir()) {
                $collection->addCollection($this->loadFromDirectory($file->getPathname(), $psr4Prefix . '\\' . $file->getFilename()));
                continue;
            }
            if ('php' !== $file->getExtension() || !class_exists($className = $psr4Prefix . '\\' . $file->getBasename('.php')) || (new \ReflectionClass($className))->isAbstract()) {
                continue;
            }
            $collection->addCollection($this->import($className, 'attribute'));
        }
        return $collection;
    }

}