-module(dhcp).

-include("dhcp.hrl").

-opaque package() :: #dhcp_package{}.
-opaque option() :: dhcp_option().
-opaque flags() :: dhcp_flags().
-opaque op() :: dhcp_op().

-export_type([package/0, ip/0, short/0, mac/0, dhcp_op/0, htype/0, int32/0,
              option/0, flags/0, message_type/0, op/0, package_fields/0]).

-ignore_xref([ip_to_tpl/1, tpl_to_ip/1]).
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
-endif.

-export([ip_to_tpl/1, tpl_to_ip/1]).

-spec ip_to_tpl(ip()) -> ip_tpl().

ip_to_tpl(I) when is_integer(I) ->
    <<A:8, B:8, C:8, D:8>> = <<I:32>>,
    {A, B, C, D}.

-spec tpl_to_ip(ip_tpl()) -> ip().

tpl_to_ip({A, B, C, D}) ->
    <<I:32>> = <<A:8, B:8, C:8, D:8>>,
    I.

-ifdef(TEST).

ip2tpl_test() ->
    ?assertEqual({1, 2, 3, 4}, ip_to_tpl(16#01020304)),
    ?assertEqual({0, 0, 0, 0}, ip_to_tpl(16#00000000)),
    ?assertEqual({255, 255, 255, 255}, ip_to_tpl(16#FFFFFFFF)).

tpl2ip_test() ->
    ?assertEqual(16#01020304, tpl_to_ip({1, 2, 3, 4})),
    ?assertEqual(16#00000000, tpl_to_ip({0, 0, 0, 0})),
    ?assertEqual(16#FFFFFFFF, tpl_to_ip({255, 255, 255, 255})).

-endif.