defmodule Modbus.HelperTest do
  use ExUnit.Case
  alias Modbus.Utils
  alias Modbus.Crc

  test "bool_to_byte test" do
    assert 0x00 == Utils.bool_to_byte(0)
    assert 0xFF == Utils.bool_to_byte(1)
  end

  test "byte_count test" do
    assert 1 == Utils.byte_count(1)
    assert 1 == Utils.byte_count(2)
    assert 1 == Utils.byte_count(7)
    assert 1 == Utils.byte_count(8)
    assert 2 == Utils.byte_count(9)
    assert 2 == Utils.byte_count(15)
    assert 2 == Utils.byte_count(16)
    assert 3 == Utils.byte_count(17)
  end

  test "bin_to_bitlist test" do
    assert [1] == Utils.bin_to_bitlist(1, <<0x13>>)
    assert [1, 1] == Utils.bin_to_bitlist(2, <<0x13>>)
    assert [1, 1, 0] == Utils.bin_to_bitlist(3, <<0x13>>)
    assert [1, 1, 0, 0] == Utils.bin_to_bitlist(4, <<0x13>>)
    assert [1, 1, 0, 0, 1] == Utils.bin_to_bitlist(5, <<0x13>>)
    assert [1, 1, 0, 0, 1, 0] == Utils.bin_to_bitlist(6, <<0x13>>)
    assert [1, 1, 0, 0, 1, 0, 0] == Utils.bin_to_bitlist(7, <<0x13>>)
    assert [1, 1, 0, 0, 1, 0, 0, 0] == Utils.bin_to_bitlist(8, <<0x13>>)
    assert [1, 1, 0, 0, 1, 0, 0, 0, 1] == Utils.bin_to_bitlist(9, <<0x13, 0x01>>)
  end

  test "bin_to_reglist test" do
    assert [0x0102] == Utils.bin_to_reglist(1, <<0x01, 0x02>>)
    assert [0x0102, 0x0304] == Utils.bin_to_reglist(2, <<0x01, 0x02, 0x03, 0x04>>)
  end

  test "crc test" do
    p(<<0xCB, 0x4F>>, <<0x01, 0x05, 0x0B, 0xB8, 0x00, 0x00>>)
    p(<<0x3B, 0x0E>>, <<0x01, 0x05, 0x0B, 0xB8, 0xFF, 0x00>>)
    p(<<0xCB, 0x7F>>, <<0x01, 0x01, 0x0B, 0xB8, 0x00, 0x01>>)
    p(<<0x88, 0x51>>, <<0x01, 0x01, 0x01, 0x00>>)
  end

  defp p(crc, data) do
    assert crc == data |> Crc.crc()
  end
end