#!/bin/bash
# Copyright 2021 Google LLC
#
# 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.

source "$(dirname "${BASH_SOURCE[0]}")"/ncsid_lib.sh

UpdateNeighbor() {
  local netdev="$1"
  local service="$2"
  local object="$3"

  eval "$(GetNeighbor "$service" "$object" | JSONToVars)" || return $?
  local new_mac
  if ! new_mac="$(DetermineNeighbor "$netdev" "$IPAddress")"; then
    echo "Faild to find $IPAddress" >&2
    return 10
  fi
  new_mac=$(normalize_mac "$new_mac") || return
  if [ "$new_mac" != "$(normalize_mac "$MACAddress")" ]; then
    echo "Updating $IPAddress: $MACAddress -> $new_mac" >&2
    SuppressTerm
    local rc=0
    DeleteObject "$service" "$object" && \
      AddNeighbor "$service" "$netdev" "$IPAddress" "$new_mac" || \
      rc=$?
    UnsuppressTerm
    return $rc
  fi
}

UpdateNeighbors() {
  local netdev="$1"

  local entry
  while read entry; do
    eval "$(echo "$entry" | JSONToVars)"
    RunInterruptibleBg UpdateNeighbor "$netdev" "$service" "$object"
  done < <(GetNeighborObjects "$netdev" 2>/dev/null)
  WaitInterruptibleBg
}

Main() {
  set -o nounset
  set -o errexit
  set -o pipefail

  InitTerm
  UpdateNeighbors "$@"
}

return 0 2>/dev/null
Main "$@"