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/*
 * Copyright (c) 2021 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * \file route.c
 * \brief Implementation of hICN route
 */

#include <hicn/hicn.h>
#include <hicn/ctrl/route.h>
#include <hicn/util/ip_address.h>

#define DEFAULT_HICN_ROUTE_COST 1

struct hicn_route_s {
  hicn_ip_prefix_t prefix;
  face_id_t face_id;
  route_cost_t cost; /* Optional, 0 means no value, defaults to 1 */
};

hicn_route_t* hicn_route_create(hicn_ip_prefix_t* prefix, face_id_t face_id,
                                route_cost_t cost) {
  hicn_route_t* route = malloc(sizeof(hicn_route_t));
  if (!route) return NULL;
  route->prefix = *prefix;
  route->face_id = face_id;
  route->cost = cost != 0 ? cost : DEFAULT_HICN_ROUTE_COST;

  return route;
}

hicn_route_t* hicn_route_dup(const hicn_route_t* route) {
  hicn_route_t* new_route = malloc(sizeof(hicn_route_t));
  if (!route) return NULL;
  memcpy(new_route, route, sizeof(hicn_route_t));
  return new_route;
}

void hicn_route_free(hicn_route_t* route) { free(route); }

int hicn_route_cmp(const hicn_route_t* route1, const hicn_route_t* route2) {
  int rc;
  rc = hicn_ip_prefix_cmp(&route1->prefix, &route2->prefix);
  if (rc != 0) return rc;

  return (route1->face_id > route2->face_id)   ? 1
         : (route1->face_id < route2->face_id) ? -1
                                               : 0;
}

int hicn_route_get_prefix(const hicn_route_t* route, hicn_ip_prefix_t* prefix) {
  *prefix = route->prefix;
  return 0;
}

int hicn_route_set_prefix(hicn_route_t* route, const hicn_ip_prefix_t prefix) {
  route->prefix = prefix;
  return 0;
}

int hicn_route_get_cost(const hicn_route_t* route, int* cost) {
  *cost = route->cost;
  return 0;
}

int hicn_route_set_cost(hicn_route_t* route, const int cost) {
  route->cost = cost;
  return 0;
}

/* /!\ Please update constants in header file upon changes */
size_t hicn_route_snprintf(char* s, size_t size, const hicn_route_t* route) {
  char prefix_s[MAXSZ_IP_PREFIX];
  hicn_ip_prefix_ntop(&route->prefix, prefix_s, MAXSZ_IP_PREFIX);
  return snprintf(s, size, "%s [%d]", prefix_s, route->cost);
}