<?php

/**
 * SPDX-FileCopyrightText: 2018-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OCA\Files_Trashbin\Command;

use OCP\Files\IRootFolder;
use OCP\IDBConnection;
use OCP\IUserBackend;
use OCP\IUserManager;
use OCP\Util;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Exception\InvalidOptionException;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class CleanUp extends Command {

	public function __construct(
		protected IRootFolder $rootFolder,
		protected IUserManager $userManager,
		protected IDBConnection $dbConnection,
	) {
		parent::__construct();
	}

	protected function configure() {
		$this
			->setName('trashbin:cleanup')
			->setDescription('Remove deleted files')
			->addArgument(
				'user_id',
				InputArgument::OPTIONAL | InputArgument::IS_ARRAY,
				'remove deleted files of the given user(s)'
			)
			->addOption(
				'all-users',
				null,
				InputOption::VALUE_NONE,
				'run action on all users'
			);
	}

	protected function execute(InputInterface $input, OutputInterface $output): int {
		$users = $input->getArgument('user_id');
		$verbose = $input->getOption('verbose');
		if (!empty($users) && $input->getOption('all-users')) {
			throw new InvalidOptionException('Either specify a user_id or --all-users');
		} elseif (!empty($users)) {
			foreach ($users as $user) {
				if ($this->userManager->userExists($user)) {
					$output->writeln("Remove deleted files of   <info>$user</info>");
					$this->removeDeletedFiles($user, $output, $verbose);
				} else {
					$output->writeln("<error>Unknown user $user</error>");
					return 1;
				}
			}
		} elseif ($input->getOption('all-users')) {
			$output->writeln('Remove deleted files for all users');
			foreach ($this->userManager->getBackends() as $backend) {
				$name = get_class($backend);
				if ($backend instanceof IUserBackend) {
					$name = $backend->getBackendName();
				}
				$output->writeln("Remove deleted files for users on backend <info>$name</info>");
				$limit = 500;
				$offset = 0;
				do {
					$users = $backend->getUsers('', $limit, $offset);
					foreach ($users as $user) {
						$output->writeln("   <info>$user</info>");
						$this->removeDeletedFiles($user, $output, $verbose);
					}
					$offset += $limit;
				} while (count($users) >= $limit);
			}
		} else {
			throw new InvalidOptionException('Either specify a user_id or --all-users');
		}
		return 0;
	}

	/**
	 * remove deleted files for the given user
	 */
	protected function removeDeletedFiles(string $uid, OutputInterface $output, bool $verbose): void {
		\OC_Util::tearDownFS();
		\OC_Util::setupFS($uid);
		$path = '/' . $uid . '/files_trashbin';
		if ($this->rootFolder->nodeExists($path)) {
			$node = $this->rootFolder->get($path);

			if ($verbose) {
				$output->writeln('Deleting <info>' . Util::humanFileSize($node->getSize()) . "</info> in trash for <info>$uid</info>.");
			}
			$node->delete();
			if ($this->rootFolder->nodeExists($path)) {
				$output->writeln('<error>Trash folder sill exists after attempting to delete it</error>');
				return;
			}
			$query = $this->dbConnection->getQueryBuilder();
			$query->delete('files_trash')
				->where($query->expr()->eq('user', $query->createParameter('uid')))
				->setParameter('uid', $uid);
			$query->executeStatement();
		} else {
			if ($verbose) {
				$output->writeln("No trash found for <info>$uid</info>");
			}
		}
	}
}
