<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Julius Härtl <jus@bitgrid.net>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 */

/**
 * Public interface of ownCloud for apps to use.
 * Files/Node interface
 */

// use OCP namespace for all classes that are considered public.
// This means that they should be used by apps instead of the internal ownCloud classes

namespace OCP\Files;

use OCP\Lock\LockedException;

/**
 * Interface Node
 *
 * @package OCP\Files
 * @since 6.0.0 - extends FileInfo was added in 8.0.0
 */
interface Node extends FileInfo {
	/**
	 * Move the file or folder to a new location
	 *
	 * @param string $targetPath the absolute target path
	 * @return Node
	 * @throws NotFoundException
	 * @throws NotPermittedException if move not allowed or failed
	 * @throws LockedException
	 * @throws InvalidPathException
	 * @since 6.0.0
	 */
	public function move($targetPath);

	/**
	 * Delete the file or folder
	 *
	 * @return void
	 * @throws NotPermittedException
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function delete();

	/**
	 * Cope the file or folder to a new location
	 *
	 * @param string $targetPath the absolute target path
	 * @return Node
	 * @since 6.0.0
	 */
	public function copy($targetPath);

	/**
	 * Change the modified date of the file or folder
	 * If $mtime is omitted the current time will be used
	 *
	 * @param int $mtime (optional) modified date as unix timestamp
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @throws NotPermittedException
	 * @return void
	 * @since 6.0.0
	 */
	public function touch($mtime = null);

	/**
	 * Get the storage backend the file or folder is stored on
	 *
	 * @return Storage
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function getStorage();

	/**
	 * Get the full path of the file or folder
	 *
	 * @return string
	 * @since 6.0.0
	 */
	public function getPath();

	/**
	 * Get the path of the file or folder relative to the mountpoint of it's storage
	 *
	 * @return string
	 * @since 6.0.0
	 */
	public function getInternalPath();

	/**
	 * Get the internal file id for the file or folder
	 *
	 * @return int
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function getId();

	/**
	 * Get metadata of the file or folder
	 * The returned array contains the following values:
	 *  - mtime
	 *  - size
	 *
	 * @return array
	 * @since 6.0.0
	 */
	public function stat();

	/**
	 * Get the modified date of the file or folder as unix timestamp
	 *
	 * @return int
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function getMTime();

	/**
	 * Get the size of the file or folder in bytes
	 *
	 * @param bool $includeMounts
	 * @return int
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function getSize($includeMounts = true);

	/**
	 * Get the Etag of the file or folder
	 * The Etag is an string id used to detect changes to a file or folder,
	 * every time the file or folder is changed the Etag will change to
	 *
	 * @return string
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function getEtag();


	/**
	 * Get the permissions of the file or folder as a combination of one or more of the following constants:
	 *  - \OCP\Constants::PERMISSION_READ
	 *  - \OCP\Constants::PERMISSION_UPDATE
	 *  - \OCP\Constants::PERMISSION_CREATE
	 *  - \OCP\Constants::PERMISSION_DELETE
	 *  - \OCP\Constants::PERMISSION_SHARE
	 *
	 * @return int
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0 - namespace of constants has changed in 8.0.0
	 */
	public function getPermissions();

	/**
	 * Check if the file or folder is readable
	 *
	 * @return bool
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function isReadable();

	/**
	 * Check if the file or folder is writable
	 *
	 * @return bool
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function isUpdateable();

	/**
	 * Check if the file or folder is deletable
	 *
	 * @return bool
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function isDeletable();

	/**
	 * Check if the file or folder is shareable
	 *
	 * @return bool
	 * @throws InvalidPathException
	 * @throws NotFoundException
	 * @since 6.0.0
	 */
	public function isShareable();

	/**
	 * Get the parent folder of the file or folder
	 *
	 * @return Folder
	 * @since 6.0.0
	 */
	public function getParent();

	/**
	 * Get the filename of the file or folder
	 *
	 * @return string
	 * @since 6.0.0
	 */
	public function getName();

	/**
	 * Acquire a lock on this file or folder.
	 *
	 * A shared (read) lock will prevent any exclusive (write) locks from being created but any number of shared locks
	 * can be active at the same time.
	 * An exclusive lock will prevent any other lock from being created (both shared and exclusive).
	 *
	 * A locked exception will be thrown if any conflicting lock already exists
	 *
	 * Note that this uses mandatory locking, if you acquire an exclusive lock on a file it will block *all*
	 * other operations for that file, even within the same php process.
	 *
	 * Acquiring any lock on a file will also create a shared lock on all parent folders of that file.
	 *
	 * Note that in most cases you won't need to manually manage the locks for any files you're working with,
	 * any filesystem operation will automatically acquire the relevant locks for that operation.
	 *
	 * @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
	 * @throws LockedException
	 * @since 9.1.0
	 */
	public function lock($type);

	/**
	 * Check the type of an existing lock.
	 *
	 * A shared lock can be changed to an exclusive lock is there is exactly one shared lock on the file,
	 * an exclusive lock can always be changed to a shared lock since there can only be one exclusive lock int he first place.
	 *
	 * A locked exception will be thrown when these preconditions are not met.
	 * Note that this is also the case if no existing lock exists for the file.
	 *
	 * @param int $targetType \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
	 * @throws LockedException
	 * @since 9.1.0
	 */
	public function changeLock($targetType);

	/**
	 * Release an existing lock.
	 *
	 * This will also free up the shared locks on any parent folder that were automatically acquired when locking the file.
	 *
	 * Note that this method will not give any sort of error when trying to free a lock that doesn't exist.
	 *
	 * @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
	 * @throws LockedException
	 * @since 9.1.0
	 */
	public function unlock($type);
}
