<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Bjoern Schiessle <bjoern@schiessle.org>
 * @author Daniel Calviño Sánchez <danxuliu@gmail.com>
 * @author Joas Schilling <coding@schilljs.com>
 * @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/>
 *
 */

namespace OCP\Share;

use OCP\Files\Folder;
use OCP\Files\Node;
use OCP\Share\Exceptions\GenericShareException;
use OCP\Share\Exceptions\ShareNotFound;

/**
 * Interface IShareProvider
 *
 * @package OCP\Share
 * @since 9.0.0
 */
interface IShareProvider {

	/**
	 * Return the identifier of this provider.
	 *
	 * @return string Containing only [a-zA-Z0-9]
	 * @since 9.0.0
	 */
	public function identifier();

	/**
	 * Create a share
	 *
	 * @param \OCP\Share\IShare $share
	 * @return \OCP\Share\IShare The share object
	 * @since 9.0.0
	 */
	public function create(\OCP\Share\IShare $share);

	/**
	 * Update a share
	 *
	 * @param \OCP\Share\IShare $share
	 * @return \OCP\Share\IShare The share object
	 * @since 9.0.0
	 */
	public function update(\OCP\Share\IShare $share);

	/**
	 * Accept a share.
	 *
	 * @param IShare $share
	 * @param string $recipient
	 * @return IShare The share object
	 * @since 17.0.0
	 */
//	public function acceptShare(IShare $share, string $recipient): IShare;

	/**
	 * Delete a share
	 *
	 * @param \OCP\Share\IShare $share
	 * @since 9.0.0
	 */
	public function delete(\OCP\Share\IShare $share);

	/**
	 * Unshare a file from self as recipient.
	 * This may require special handling. If a user unshares a group
	 * share from their self then the original group share should still exist.
	 *
	 * @param \OCP\Share\IShare $share
	 * @param string $recipient UserId of the recipient
	 * @since 9.0.0
	 */
	public function deleteFromSelf(\OCP\Share\IShare $share, $recipient);

	/**
	 * Restore a share for a given recipient. The implementation could be provider independant.
	 *
	 * @param IShare $share
	 * @param string $recipient
	 * @return IShare The restored share object
	 *
	 * @since 14.0.0
	 * @throws GenericShareException In case the share could not be restored
	 */
	public function restore(IShare $share, string $recipient): IShare;

	/**
	 * Move a share as a recipient.
	 * This is updating the share target. Thus the mount point of the recipient.
	 * This may require special handling. If a user moves a group share
	 * the target should only be changed for them.
	 *
	 * @param \OCP\Share\IShare $share
	 * @param string $recipient userId of recipient
	 * @return \OCP\Share\IShare
	 * @since 9.0.0
	 */
	public function move(\OCP\Share\IShare $share, $recipient);

	/**
	 * Get all shares by the given user in a folder
	 *
	 * @param string $userId
	 * @param Folder $node
	 * @param bool $reshares Also get the shares where $user is the owner instead of just the shares where $user is the initiator
	 * @return \OCP\Share\IShare[]
	 * @since 11.0.0
	 */
	public function getSharesInFolder($userId, Folder $node, $reshares);

	/**
	 * Get all shares by the given user
	 *
	 * @param string $userId
	 * @param int $shareType
	 * @param Node|null $node
	 * @param bool $reshares Also get the shares where $user is the owner instead of just the shares where $user is the initiator
	 * @param int $limit The maximum number of shares to be returned, -1 for all shares
	 * @param int $offset
	 * @return \OCP\Share\IShare[]
	 * @since 9.0.0
	 */
	public function getSharesBy($userId, $shareType, $node, $reshares, $limit, $offset);

	/**
	 * Get share by id
	 *
	 * @param int $id
	 * @param string|null $recipientId
	 * @return \OCP\Share\IShare
	 * @throws ShareNotFound
	 * @since 9.0.0
	 */
	public function getShareById($id, $recipientId = null);

	/**
	 * Get shares for a given path
	 *
	 * @param Node $path
	 * @return \OCP\Share\IShare[]
	 * @since 9.0.0
	 */
	public function getSharesByPath(Node $path);

	/**
	 * Get shared with the given user
	 *
	 * @param string $userId get shares where this user is the recipient
	 * @param int $shareType
	 * @param Node|null $node
	 * @param int $limit The max number of entries returned, -1 for all
	 * @param int $offset
	 * @return \OCP\Share\IShare[]
	 * @since 9.0.0
	 */
	public function getSharedWith($userId, $shareType, $node, $limit, $offset);

	/**
	 * Get a share by token
	 *
	 * @param string $token
	 * @return \OCP\Share\IShare
	 * @throws ShareNotFound
	 * @since 9.0.0
	 */
	public function getShareByToken($token);

	/**
	 * A user is deleted from the system
	 * So clean up the relevant shares.
	 *
	 * @param string $uid
	 * @param int $shareType
	 * @since 9.1.0
	 */
	public function userDeleted($uid, $shareType);

	/**
	 * A group is deleted from the system.
	 * We have to clean up all shares to this group.
	 * Providers not handling group shares should just return
	 *
	 * @param string $gid
	 * @since 9.1.0
	 */
	public function groupDeleted($gid);

	/**
	 * A user is deleted from a group
	 * We have to clean up all the related user specific group shares
	 * Providers not handling group shares should just return
	 *
	 * @param string $uid
	 * @param string $gid
	 * @since 9.1.0
	 */
	public function userDeletedFromGroup($uid, $gid);

	/**
	 * Get the access list to the array of provided nodes.
	 *
	 * @see IManager::getAccessList() for sample docs
	 *
	 * @param Node[] $nodes The list of nodes to get access for
	 * @param bool $currentAccess If current access is required (like for removed shares that might get revived later)
	 * @return array
	 * @since 12
	 */
	public function getAccessList($nodes, $currentAccess);

	/**
	 * Get all the shares in this provider returned as iterable to reduce memory
	 * overhead
	 *
	 * @return iterable
	 * @since 18.0.0
	 */
	public function getAllShares(): iterable;
}