defmodule Reactivity.Test do
  require Integer
  require Logger

  alias Reactivity.Signal.Source
  
  def hot_cold(t) do
    if t > 30 do
      "hot"
    else
      "cold"
    end
  end

  def init do
    {:ok, t} = Source.new(fn(_old_value) -> Enum.random(10..100) end, -1, 100, :temperature)
    #{:ok, h} = Source.new(fn(_old_value) -> Enum.random(60..100) end, -1, 100, :humidity)
  end
  
  def test do
    # Print out "hot" or "cold" when temp changes.
    Reactivity.source(:temperature)
    |> Reactivity.liftapp(&hot_cold/1)
    |> Reactivity.liftapp(&(Logger.debug "Celcius: #{&1}"))

    # Create a new signal in Kelvin.
    kelvin = Reactivity.source(:temperature) |> Reactivity.liftapp(&(&1 + 237.15))

    # Print out hot/cold for the kelvin signal
    |> Reactivity.liftapp(&hot_cold/1)
    |> Reactivity.liftapp(&(Logger.debug "Kelvin: #{&1}"))
  end
end