#!/usr/bin/lua

function getConfig()

  local uci=require("uci")
  local cur=uci.cursor()
  local config="weathermon"

  web_url  = cur.get(config,"web","url")
  web_user = cur.get(config,"web","user")
  web_pass = cur.get(config,"web","password")
  web_devid = cur.get(config,"web","devid")

  web_iface = cur.get(config,"web","iface")

  if not web_devid then
  
    if web_iface then
      io.input("/sys/class/net/"..web_iface.."/address")
    else
      io.input("/sys/class/net/eth0/address")
    end

    mac = io.read("*line")
    mac = mac:gsub(":","")
    mac = mac:upper()

    web_devid = mac

  end

  logging = cur.get(config,"logging","enabled") 

  serial_port = cur.get(config,"serial","port")
  serial_baud = cur.get(config,"serial","baud")

  if serial_port then

    command = "stty -F  "..serial_port.." "..serial_baud
    os.execute(command)

  end

  mqtt_host = cur.get(config,"mqtt","host")
  mqtt_port = cur.get(config,"mqtt","port")
  mqtt_id = cur.get(config,"mqtt","id")
  mqtt_topic = cur.get(config,"mqtt","topic")

  if mqtt_host and not mqtt_id then
    mqtt_id="weather-"..web_devid
  end

  if mqtt_host and not mqtt_port then
    mqtt_port = 1883
  end

  if mqtt_host and not mqtt_topic then
    mqtt_topic = 'weathermon/'..web_devid
  end

end

require "socket"

function sleep(sec)
  socket.select(nil, nil, sec)
end

function splitStr(str,char)

  local res = {}
  local idx = 1


  while str:len()>0 do
    pos = str:find(char); 
    if pos == nil then
      res[idx]=str
      str=""
    else
      res[idx]=str:sub(1,pos-1)
      idx=idx+1
      str=str:sub(pos+1)
    end
  end

  return res

end

function printLog(str)
  print(str)
  if logging=="on" then
    os.execute("logger -t weathermon "..str)
  end 
end

function submitValue(type,id,param,val)

  url = web_url.."?stype="..type.."&sid="..id.."&param="..param.."&value="..val

  command = "curl"

  if web_iface then
    command = command.." --interface "..web_iface
  end

  if web_user then
    command = command.." -u "..web_user..":"..web_pass
  end

  command = command.." \""..url.."\""

  print(command)
  os.execute(command)
  print("")

end

function processLine(str)

  msg=splitStr(line,':')
  msg_type=msg[1] or nil
  msg_body=msg[2] or nil
  if msg_type=="STATUS" then
    printLog("Status: "..msg_body)
  elseif msg_type=="ERROR" then
    printLog("Error: "..msg_body)  
  elseif msg_type=="SENSOR" then
    printLog("SENSOR: "..msg_body)  
    sens = splitStr(msg_body,",")
    sensor = {}
    idx = 1
    sensor_type = nil
    sensor_id = web_devid
    for i,rec in ipairs(sens) do
      recrd=splitStr(rec,'=')
      key=recrd[1] or nil
      value=recrd[2] or nil
      if value then
        if key=="TYPE" then
          sensor_type=value
        elseif key=="ID" then
          sensor_id=value
        else
          sensor[key]=value
        end
      end
    end
    mqtt_param = {}
    for k,v in pairs(sensor) do
      printLog("Type = "..sensor_type..", ID = "..sensor_id..", Param = "..k..", Value = "..v)
      submitValue(sensor_type,sensor_id,k,v)
      mqtt_param[k]=v
    end
    mqtt_msg = { type=sensor_type, data=mqtt_param }
    if mqtt_client then
      serializedString = json.encode(mqtt_msg)
      mqtt_client:publish(mqtt_topic,serializedString)
    end
  end

end

getConfig()

if mqtt_host then
  MQTT = require "paho.mqtt"
  mqtt_client = MQTT.client.create(mqtt_host, mqtt_port)
  mqtt_client:connect(mqtt_id)
  json = require( "json" )
end

serialin=io.open(serial_port,"r")
while 1 do
  line=serialin:read()
  print(line)
  processLine(line)
end