#!/bin/bash

is_serverip6route_set() {
  local server_ip6s=${1}

  if [[ -z "${server_ip6s}" ]]; then
    return 0
  fi

  for server_ip6 in ${server_ip6s}; do
    if ! ip -6 route | grep -q "^${server_ip6}"; then
      return 1
    fi
  done
}

unset_serverip6route() {
  local server_ip6s=${1}
  local ip6_gw=${2}
  local wired_device=${3}

  for server_ip6 in ${server_ip6s}; do
    ip route delete "${server_ip6}/128" via "${ip6_gw}" dev "${wired_device}"
  done
}

old_ip6_gw=$(yunohost app setting vpnclient ip6_gw)
old_wired_device=$(yunohost app setting vpnclient wired_device)
old_server_ip6=$(yunohost app setting vpnclient server_ip6)

# Check old state of the server ipv6 route
if [[ -n "${old_server_ip6}" && -n "${old_ip6_gw}" && -n "${old_wired_device}" ]]; then
  if is_serverip6route_set "${old_server_ip6}"; then
    unset_serverip6route "${old_server_ip6}" "${old_ip6_gw}" "${old_wired_device}"
  fi
fi