'use strict'

assert = require 'src/assert'

module.exports = (impl) ->
    {degToRad} = impl.utils
    sensor = null

    listener = (e) ->
        if sensor
            sensor.x = degToRad e.beta or 0
            assert.isFloat sensor.x

            sensor.y = degToRad e.gamma or 0
            assert.isFloat sensor.y

            sensor.z = degToRad e.alpha or 0
            assert.isFloat sensor.z
        return

    enableRotationSensor: ->
        sensor = @
        window.addEventListener 'deviceorientation', listener
        return

    disableRotationSensor: ->
        sensor = null
        window.removeEventListener 'deviceorientation', listener
        return