defmodule Farmbot.Firmware.Utils do
  @moduledoc """
  Helpful utilities for working with Firmware data.
  """

  @compile {:inline, [num_to_bool: 1]}
  @doc "changes a number to a boolean. 1 => true, 0 => false"
  def num_to_bool(num) when num == 1, do: true
  def num_to_bool(num) when num == 0, do: false

  @compile {:inline, [fmnt_float: 1]}
  @doc "Format a float to a binary with two leading decimals."
  def fmnt_float(num) when is_float(num),
    do: :erlang.float_to_binary(num, [:compact, {:decimals, 2}])

  def fmnt_float(num) when is_integer(num), do: fmnt_float(num / 1)

  @compile {:inline, [extract_pin_mode: 1]}
  @doc "Changes `:digital` => 0, and `:analog` => 1"
  def extract_pin_mode(:digital), do: 0
  def extract_pin_mode(:analog), do: 1
  def extract_pin_mode(0), do: 0
  def extract_pin_mode(1), do: 1


  # https://github.com/arduino/Arduino/blob/2bfe164b9a5835e8cb6e194b928538a9093be333/hardware/arduino/avr/cores/arduino/Arduino.h#L43-L45
  @compile {:inline, [extract_set_pin_mode: 1]}
  @doc "Changes `set_pin_mode` arg to an integer for the Firmware."
  def extract_set_pin_mode(:input), do: 0x0
  def extract_set_pin_mode(:input_pullup), do: 0x2
  def extract_set_pin_mode(:output), do: 0x1

  @doc "replace the firmware handler at runtime."
  def replace_firmware_handler(handler) do
    old = Application.get_all_env(:farmbot_core)[:behaviour]
    new = Keyword.put(old, :firmware_handler, handler)
    Application.put_env(:farmbot_core, :behaviour, new)
  end
end