/*
 * uhub - A tiny ADC p2p connection hub
 * Copyright (C) 2007-2009, Jan Vidar Krey
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef HAVE_UHUB_USER_MANAGER_H
#define HAVE_UHUB_USER_MANAGER_H

struct user_manager
{
	size_t count;                   /**<< "Number of all fully connected and logged in users" */
	size_t count_peak;              /**<< "Peak number of users" */
	sid_t free_sid;                 /**<< "The next available SID." */
	uint64_t shared_size;           /**<< "The total number of shared bytes among fully connected users." */
	uint64_t shared_files;          /**<< "The total number of shared files among fully connected users." */
	struct linked_list* list;       /**<< "Contains all users" */
};

/**
 * Initializes the user manager.
 * @return 0 on success, or -1 if error (out of memory).
 */
extern int user_manager_init(struct hub_info* hub);

/**
 * Shuts down the user manager.
 * All users will be disconnected and deleted as part of this.
 */
extern void user_manager_shutdown(struct hub_info* hub);

/**
 * Generate statistics for logfiles.
 */
extern void user_manager_update_stats(struct hub_info* hub);
extern void user_manager_print_stats(struct hub_info* hub);

/**
 * Add a new user to the user manager.
 */
extern void user_manager_add(struct user* user);

/**
 * Remove a user from the user manager.
 * This user is connected, and will be moved to the leaving queue, pending
 * all messages in the message queue, and resource cleanup.
 */
extern void user_manager_remove(struct user* user);

/**
 * Returns a free sid for a new user.
 */
extern sid_t user_manager_get_free_sid(struct hub_info* hub);

/**
 * Lookup a user based on the session ID (sid).
 * NOTE: This will only search connected users.
 * @return a user if found, or NULL if not found
 */
extern struct user* get_user_by_sid(struct hub_info* hub, sid_t sid);

/**
 * Lookup a user based on the client ID (cid).
 * @return a user if found, or NULL if not found
 */
extern struct user* get_user_by_cid(struct hub_info* hub, const char* cid);

/**
 * Lookup a user based on the nick name.
 * @return a user if found, or NULL if not found
 */
extern struct user* get_user_by_nick(struct hub_info* hub, const char* nick);

/**
 * Send the user list of connected clients to 'user'.
 * Usually part of the login process.
 *
 * @return 1 if sending the user list succeeded, 0 otherwise.
 */
extern int send_user_list(struct user* user);

/**
 * Send a quit message to all connected users when 'user' is
 * leaving the hub (for whatever reason).
 */
extern void send_quit_message(struct user* user);


#endif /* HAVE_UHUB_USER_MANAGER_H */