<?php
/**
 * @author Bart Visscher <bartv@thisnet.nl>
 * @author Felix Moeller <mail@felixmoeller.de>
 * @author Lukas Reschke <lukas@owncloud.com>
 * @author Michael Gapczynski <gapczynskim@gmail.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <icewind@owncloud.com>
 * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @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/>
 *
 */
abstract class OC_Group_Example {
	/**
	 * Try to create a new group
	 * @param string $gid The name of the group to create
	 * @return bool
	 *
	 * Tries to create a new group. If the group name already exists, false will
	 * be returned.
	 */
	abstract public static function createGroup($gid);

	/**
	 * delete a group
	 * @param string $gid gid of the group to delete
	 * @return bool
	 *
	 * Deletes a group and removes it from the group_user-table
	 */
	abstract public static function deleteGroup($gid);

	/**
	 * is user in group?
	 * @param string $uid uid of the user
	 * @param string $gid gid of the group
	 * @return bool
	 *
	 * Checks whether the user is member of a group or not.
	 */
	abstract public static function inGroup($uid, $gid);

	/**
	 * Add a user to a group
	 * @param string $uid Name of the user to add to group
	 * @param string $gid Name of the group in which add the user
	 * @return bool
	 *
	 * Adds a user to a group.
	 */
	abstract public static function addToGroup($uid, $gid);

	/**
	 * Removes a user from a group
	 * @param string $uid Name of the user to remove from group
	 * @param string $gid Name of the group from which remove the user
	 * @return bool
	 *
	 * removes the user from a group.
	 */
	abstract public static function removeFromGroup($uid, $gid);

	/**
	 * Get all groups a user belongs to
	 * @param string $uid Name of the user
	 * @return array an array of group names
	 *
	 * This function fetches all groups a user belongs to. It does not check
	 * if the user exists at all.
	 */
	abstract public static function getUserGroups($uid);

	/**
	 * get a list of all groups
	 * @param string $search
	 * @param int $limit
	 * @param int $offset
	 * @return array an array of group names
	 */
	abstract public static function getGroups($search = '', $limit = -1, $offset = 0);

	/**
	 * Check if a group exists
	 * @param string $gid
	 * @return bool
	 */
	abstract public function groupExists($gid);

	/**
	 * get a list of all users in a group
	 * @param string $gid
	 * @param string $search
	 * @param int $limit
	 * @param int $offset
	 * @return array an array of user ids
	 */
	abstract public static function usersInGroup($gid, $search = '', $limit = -1, $offset = 0);
}