#!/usr/bin/lua

-- PID file to ensure the hoodselector isn't running parallel
local pidPath="/var/run/hoodselector.pid"

local uci = require('simple-uci').cursor()
local hoodutil = require("hoodselector.util")

if io.open(pidPath, "r") ~=nil then
  hoodutil.log("The hoodselector is still running.")
  os.exit(1)
else
  if io.open(pidPath, "w") ==nil then
    hoodutil.log("Can`t create pid file on "..pidPath)
    os.exit(1)
  end
end

-- Program terminating function including removing of PID file
local function exit(exc)
  if io.open(pidPath, "r") ~=nil then
    os.remove(pidPath)
  end
  os.exit(tonumber(exc))
end

-- initialization done
--
local function get_mesh_vpn_interface()
  local ret = {}
  if hoodutil.fastd_installed() then
    local vpnifac = uci:get('fastd', 'mesh_vpn_backbone', 'net')
    if vpnifac  ~= nil then
      vpnifac = vpnifac:gsub("%_",'-')
      table.insert(ret,vpnifac)
    else
      hoodutil.log("fastd uci config broken! abort...")
      exit(1)
    end
  end
  if hoodutil.tunneldigger_installed() then
    local vpnifac = uci:get('tunneldigger', 'mesh_vpn', 'interface')
    if vpnifac  ~= nil then
      table.insert(ret,vpnifac)
    else
      hoodutil.log("tunneldigger uci config broken! abort...")
      exit(1)
    end
  end
  return ret
end

-- INITIALIZE AND PREPARE DATA --
-- read hoodfile...
local jhood = hoodutil.get_domains()

-- get defaul hood
local defaultHood = hoodutil.getDefaultHood(jhood)

-- VPN MODE
-- If we have a VPN connection then we will try to get the routers location and
-- select the hood coresponding to our location.
-- If no hood for the location has been defined, we will select
-- the default hood.
-- If we can not get our routers location, we will continure to next mode.
if hoodutil.directVPN(get_mesh_vpn_interface()) then
  io.stdout:write('VPN connection found.\n')
  local geo = hoodutil.getGeolocation()
  if geo.lat ~= nil and geo.lon ~= nil then
    io.stdout:write('Position found.\n')
    local geoHood = hoodutil.getHoodByGeo(jhood, geo)
    if geoHood ~= nil then
      if hoodutil.set_hoodconfig(geoHood) then
        hoodutil.restart_services() -- TMP solution
        io.stdout:write('Hood set by VPN mode.\n')
      end
      exit(0)
    end
    io.stdout:write('No hood has been defined for current position.\n')
    if hoodutil.set_hoodconfig(defaultHood) then
      hoodutil.restart_services() -- TMP solution
      io.stdout:write('Hood set by VPN mode.\n')
    end
    exit(0)
  else
    -- The hoodselector should continure with next states because thier can be other
    -- VPN routers in the local mesh network which provides a possition and therfore
    -- have set a geo base hood.
    io.stdout:write('No position found\n')
  end
else
  io.stdout:write('No VPN connection found\n')
end

exit(0)