/*
 * =====================================================================================
 *
 *       Filename:  rt.h
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  10/03/24 12:47:20 PM IST
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  YOUR NAME (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#ifndef __RT__
#define __RT__

#include <stdbool.h>
#include "notif.h"

typedef struct rt_entry_keys_{

    char dest[16];
    char mask;
} rt_entry_keys_t;

typedef struct rt_entry_{

    /* A Structure which represnets only the keys of the
     * Routing Table.*/
    rt_entry_keys_t rt_entry_keys;

    char gw_ip[16];
    char oif[32];
	bool created;
    struct rt_entry_ *prev;
    struct rt_entry_ *next;	
	notif_chain_t *nfc;
} rt_entry_t;

typedef struct rt_table_{

    rt_entry_t *head;
} rt_table_t;

void
rt_init_rt_table(rt_table_t *rt_table);

rt_entry_t *
rt_add_or_update_rt_entry(rt_table_t *rt_table,
    char *dest_ip, char mask, char *gw_ip, char *oif);

bool
rt_delete_rt_entry(rt_table_t *rt_table,
    char *dest_ip, char mask);

bool
rt_update_rt_entry(rt_table_t *rt_table,
    char *dest_ip, char mask, 
    char *new_gw_ip, char *new_oif);

rt_entry_t *
rt_look_up_rt_entry(rt_table_t *rt_table, 
					char *dest, char mask);

void
rt_clear_rt_table(rt_table_t *rt_table);

void
rt_free_rt_table(rt_table_t *rt_table);

void
rt_dump_rt_table(rt_table_t *rt_table);

static inline void
rt_entry_remove(rt_table_t *rt_table,
                rt_entry_t *rt_entry){

    if(!rt_entry->prev){
        if(rt_entry->next){
            rt_entry->next->prev = 0;
            rt_table->head = rt_entry->next;
            rt_entry->next = 0;
            return;
        }
		rt_table->head = 0;
        return;
    }
    if(!rt_entry->next){
        rt_entry->prev->next = 0;
        rt_entry->prev = 0;
        return;
    }

    rt_entry->prev->next = rt_entry->next;
    rt_entry->next->prev = rt_entry->prev;
    rt_entry->prev = 0;
    rt_entry->next = 0;
}

#define ITERTAE_RT_TABLE_BEGIN(rt_table_ptr, rt_entry_ptr)                \
{                                                                         \
    rt_entry_t *_next_rt_entry;                                           \
    for((rt_entry_ptr) = (rt_table_ptr)->head;                            \
            (rt_entry_ptr);                                               \
            (rt_entry_ptr) = _next_rt_entry) {                            \
        _next_rt_entry = (rt_entry_ptr)->next;

#define ITERTAE_RT_TABLE_END(rt_table_ptr, rt_entry_ptr)  }}

void
rt_table_register_for_notification(
	rt_table_t *rt_table,
	rt_entry_keys_t *key,
	size_t key_size,
	nfc_app_cb app_cb,
	uint32_t subs_id);

#endif /* __RT__ */