<?php

class DocumentPrefetcher implements Prefetcher
{
	/**
	 * @var DocumentManager
	 */
	private $manager;

	public function __construct(DocumentManager $manager)
	{
		$this->manager = $manager;
	}

	private function recursivePrefetch(Dir $dir=null)
	{
		$response = [
			'name' => '',
			'id' => 0,
			'files' => [],
			'dirs' => [],
		];
		if ($dir) {
			$response['name'] = $dir->getName();
			$response['id'] = $dir->getId();
		}
		$collection = $this->manager->getChildren($response['id']);
		foreach ($collection->getFiles() as $file) {
			$response['files'][] = [
                'id' => $file->getId(),
                'name' => $file->getName(),
                'url' => $file->getUrl(),
			];
		}

		foreach ($collection->getDirs() as $_dir) {
			$response['dirs'][] = $this->recursivePrefetch($_dir);
		}

		return $response;
	}

	public function prefetch()
	{
		return $this->recursivePrefetch();
	}

}