local json = require 'luci.json'
local util = require 'luci.util'
local fs = require 'nixio.fs'

local ifname_address_cache = {}

function ifname2address(ifname)
  local ifaddress
  if ifname_address_cache[ifname] ~= nil then
    ifaddress = ifname_address_cache[ifname]
  else
    ifaddress = util.trim(fs.readfile("/sys/class/net/" .. ifname .. "/address"))
    ifname_address_cache[ifname] = ifaddress
  end

  return ifaddress
end

function batadv()
  local interfaces = {}
  local list = io.lines("/sys/kernel/debug/batman_adv/bat0/originators")
  for line in list do
    local mac1, lastseen, tq, mac2, ifname =
      line:match("^([0-9a-f:]+) +(%d+%.%d+)s +%( *(%d+)%) +([0-9a-f:]+) +%[ *(.-)%]")

    if mac1 ~= nil and mac1 == mac2 then
      ifaddress = ifname2address(ifname)
      if interfaces[ifaddress] == nil then
        interfaces[ifaddress] = { neighbours = {} }
      end

      interfaces[ifaddress].neighbours[mac1] = { tq = tonumber(tq)
                                               , lastseen = tonumber(lastseen)
                                               }
    end
  end

  return interfaces
end

return batadv()