/*
 * Ouroboros - Copyright (C) 2016
 *
 * The IPC Resource Manager - Registry
 *
 *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef OUROBOROS_IRMD_REGISTRY_H
#define OUROBOROS_IRMD_REGISTRY_H

#include <ouroboros/config.h>
#include <ouroboros/list.h>
#include <ouroboros/irm_config.h>

#include "api_table.h"
#include "apn_table.h"

#include <stdint.h>
#include <stdbool.h>
#include <pthread.h>
#include <string.h>
#include <sys/types.h>

#define registry_has_name(r, name) \
        (registry_get_entry(r, name) != NULL)

enum reg_name_state {
        REG_NAME_NULL = 0,
        REG_NAME_IDLE,
        REG_NAME_AUTO_ACCEPT,
        REG_NAME_AUTO_EXEC,
        REG_NAME_FLOW_ACCEPT,
        REG_NAME_FLOW_ARRIVED,
        REG_NAME_DESTROY
};

/* An entry in the registry */
struct reg_entry {
        struct list_head    next;
        char *              name;

        /* DIFs in which this name is registered */
        struct list_head    difs;
        /* APs that can be instantiated by the irmd */
        struct list_head    reg_apns;
        /* Instances that are listening for this name */
        struct list_head    reg_apis;

        enum reg_name_state state;
        char *              req_ae_name;
        int                 response;
        pthread_cond_t      state_cond;
        pthread_mutex_t     state_lock;
};

int                reg_entry_add_apn(struct reg_entry * e,
                                     struct apn_entry * a);

void               reg_entry_del_apn(struct reg_entry * e,
                                     char *             apn);

char *             reg_entry_get_apn(struct reg_entry * e);


int                reg_entry_add_api(struct reg_entry * e,
                                     pid_t              api);

void               reg_entry_del_api(struct reg_entry * e,
                                     pid_t              api);

pid_t              reg_entry_get_api(struct reg_entry * e);

struct reg_entry * registry_add_name(struct list_head * registry,
                                     char *             name);

void               registry_del_name(struct list_head * registry,
                                     char *             name);

void               registry_del_api(struct list_head * registry,
                                    pid_t              api);

void               registry_sanitize_apis(struct list_head * registry);

struct reg_entry * registry_get_entry(struct list_head * registry,
                                      char *             name);

int                registry_add_name_to_dif(struct list_head * registry,
                                            char *             name,
                                            char *             dif_name,
                                            enum ipcp_type     type);

void               registry_del_name_from_dif(struct list_head * registry,
                                              char *             name,
                                              char *             dif_name);

void               registry_destroy(struct list_head * registry);

#endif /* OUROBOROS_IRMD_REGISTRY_H */
