<?php

declare(strict_types=1);
/**
 * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OCA\Files\Command\Object;

use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\Files\ObjectStore\IObjectStore;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\Util;
use Symfony\Component\Console\Output\OutputInterface;

class ObjectUtil {
	public function __construct(
		private IConfig $config,
		private IDBConnection $connection,
	) {
	}

	private function getObjectStoreConfig(): ?array {
		$config = $this->config->getSystemValue('objectstore_multibucket');
		if (is_array($config)) {
			$config['multibucket'] = true;
			return $config;
		}
		$config = $this->config->getSystemValue('objectstore');
		if (is_array($config)) {
			if (!isset($config['multibucket'])) {
				$config['multibucket'] = false;
			}
			return $config;
		}

		return null;
	}

	public function getObjectStore(?string $bucket, OutputInterface $output): ?IObjectStore {
		$config = $this->getObjectStoreConfig();
		if (!$config) {
			$output->writeln('<error>Instance is not using primary object store</error>');
			return null;
		}
		if ($config['multibucket'] && !$bucket) {
			$output->writeln('<error>--bucket option required</error> because <info>multi bucket</info> is enabled.');
			return null;
		}

		if (!isset($config['arguments'])) {
			throw new \Exception('no arguments configured for object store configuration');
		}
		if (!isset($config['class'])) {
			throw new \Exception('no class configured for object store configuration');
		}

		if ($bucket) {
			// s3, swift
			$config['arguments']['bucket'] = $bucket;
			// azure
			$config['arguments']['container'] = $bucket;
		}

		$store = new $config['class']($config['arguments']);
		if (!$store instanceof IObjectStore) {
			throw new \Exception('configured object store class is not an object store implementation');
		}
		return $store;
	}

	/**
	 * Check if an object is referenced in the database
	 */
	public function objectExistsInDb(string $object): int|false {
		if (!str_starts_with($object, 'urn:oid:')) {
			return false;
		}

		$fileId = (int)substr($object, strlen('urn:oid:'));
		$query = $this->connection->getQueryBuilder();
		$query->select('fileid')
			->from('filecache')
			->where($query->expr()->eq('fileid', $query->createNamedParameter($fileId, IQueryBuilder::PARAM_INT)));
		$result = $query->executeQuery();

		if ($result->fetchOne() === false) {
			return false;
		}

		return $fileId;
	}

	public function formatObjects(\Iterator $objects, bool $humanOutput): \Iterator {
		foreach ($objects as $object) {
			yield $this->formatObject($object, $humanOutput);
		}
	}

	public function formatObject(array $object, bool $humanOutput): array {
		$row = array_merge([
			'urn' => $object['urn'],
		], ($object['metadata'] ?? []));

		if ($humanOutput && isset($row['size'])) {
			$row['size'] = Util::humanFileSize($row['size']);
		}
		if (isset($row['mtime'])) {
			$row['mtime'] = $row['mtime']->format(\DateTimeImmutable::ATOM);
		}
		return $row;
	}
}
