local P = {}
local m
local topic, cid

local function p(msg)
  print("MQTT: "..msg)
end

local function mq_connected(con)
-- p("connected")
end

local function mq_disconnected(con)
-- p("disconnected")
  m:close()
  m = nil
end

local function mq_client_connected(con)
  p("connected")

  local majorVer, minorVer, devVer, chipId, flashId, flashSize, flashMode, flashSpeed, buildDate = node.info()
  payload = '{"version": "'..majorVer..'.'..minorVer..'.'..devVer..'", "chipId":'..chipId..', "flashId":'..flashId..', "flashSize":'..flashSize..', "flashMode":'..flashMode..', "flashSpeed":'..flashSpeed

  if buildDate then
    payload = payload..', "buildDate": "'..buildDate..'"'
  end

  if node.info_versions then
    major, minor, dev, buildDate, sdkVersion = node.info_versions()
    payload = payload..'", versions": {"major": '..major..', "minor": '..minor..', "dev": '..dev..', "buildDate": "'..buildDate..'", "sdk": "'..sdkVersion..'"}'
  end
  payload = payload.."}"
  P.publish("firmware", payload)
end

function mq_on_timer()
  -- This crashes the module:
  -- local status = wifi.sta.status()
  -- p("checking status, status="..status)

  local status = wifi.sta.getip()

  if status and status ~= "0.0.0.0" then
    if not m then
      p("connecting")

      -- client id, keepalive, username, password
      m = mqtt.Client(cid, 120)
      m:on("connect", mq_connected)
      m:on("offline", mq_disconnected)

      -- host, port, secure, auto_reconnect, function(client), ssl=8883
      m:connect("trygvis.io", 1883, 0, 0, mq_client_connected)
    end
  else
    if m then
      p("Lost wifi connection, disconnecting")
      m:close()
      m = nil
    end
  end
end

function P.init(timer_id, client_id)
  p("Configuring")

  topic = "/esp8266/"..client_id
  cid = client_id

  tmr.alarm(timer_id, 3 * 1000, 1, mq_on_timer)

  p("Configured")
end 

function P.publish(path, payload)
  if m then
    m:publish(topic.."/"..path, payload, 0, 0)
  end
end

return P