DewPoint

module.exports = (env) ->

  # Require the  bluebird promise library
  Promise = env.require 'bluebird'

  # Require the [cassert library](https://github.com/rhoot/cassert).
  assert = env.require 'cassert'

  # Include you own depencies with nodes global require function:
  #
  #     someThing = require 'someThing'
  #
  class Dewpoint extends env.plugins.Plugin

    init: (app, @framework, @config) =>
      env.logger.info("Hello World")
      deviceConfigDef = require("./device-config-schema")

      @framework.deviceManager.registerDeviceClass("DewpointDevice", {
        configDef: deviceConfigDef.DewpointDevice,
        createCallback: (config) => new DewpointDevice(config)
      })


  class DewpointDevice extends env.devices.TemperatureSensor
    _temperature: null

    constructor: (@config) ->
      @id = config.id
      @name = config.name
      @_temperature = lastState?.temperature?.value
      super()

      @doYourStuff()
      setInterval( ( => @doYourStuff() ), @config.interval)

    doYourStuff: ->
      a=7.5
      b=237.3
      T=22  #temperature
      H=40  #humidity

      sdd=6.1078 * Math.pow(10,(a*T)/(b+T))
      dd=sdd*(H/100)
      v=Math.log(dd/6.1078)/Math.log(10)
      td=(b*v)/(a-v)
    #console.log(td)
      @_temperature = td
      @emit 'temperature', td

    getTemperature: -> Promise.resolve(@_temperature)

  # ###Finally
  # Create a instance of my plugin
  Dewpoint = new Dewpoint
  # and return it to the framework.
  return Dewpoint