#!/usr/bin/lua

local sysconfig = require 'gluon.sysconfig'
local gluon_util = require 'gluon.util'
local platform = require 'gluon.platform'

local uci = require('luci.model.uci').cursor()


if not (sysconfig.lan_ifname or sysconfig.wan_ifname) then
  local function iface_exists(name)
    return (gluon_util.exec('ip', 'link', 'show', 'dev', (name:gsub('%..*$', ''))) == 0)
  end


  local lan_ifname = uci:get('network', 'lan', 'ifname')
  local wan_ifname = uci:get('network', 'wan', 'ifname')

  if platform.match('ar71xx', 'generic', {'cpe510', 'nanostation-m', 'nanostation-m-xw', 'unifi-outdoor-plus'}) then
    lan_ifname, wan_ifname = wan_ifname, lan_ifname
  end

  if wan_ifname and iface_exists(wan_ifname) then
    sysconfig.wan_ifname = wan_ifname
    sysconfig.lan_ifname = lan_ifname
  else
    sysconfig.wan_ifname = lan_ifname
  end


  uci:delete('network', 'lan')
  uci:delete('network', 'wan')

  uci:save('network')
  uci:commit('network')
end