-module(glip_ffi).

% Enable inlining, as all the functions are very small.
-compile(inline).

-export([to_string/1, parse_ip/1, parse_ip_preserving_string/1, address_family/1,
         to_external_ip/1, enrich/1]).

parse_ip(String) ->
  Charlist = unicode:characters_to_list(String),
  case inet:parse_strict_address(Charlist) of
    {ok, Ip} ->
      {ok, Ip};
    _ ->
      {error, nil}
  end.

parse_ip_preserving_string(String) ->
  case parse_ip(String) of
    {ok, Ip} ->
      {ok, {ip_with_string, Ip, String}};
    Error ->
      Error
  end.

to_external_ip(Address) ->
  case ip of
    {ip_with_string, Ip, _} ->
      Ip;
    _ ->
      Address
  end.

address_family(Address) ->
  case to_external_ip(Address) of
    {_, _, _, _} ->
      ipv4;
    {_, _, _, _, _, _, _, _} ->
      ipv6
  end.

to_string(Address) ->
  case Address of
    {ip_with_string, _, String} ->
      String;
    Ip ->
      ip_to_string(Ip)
  end.

enrich(Address) ->
  case Address of
    {ip_with_string, _, String} ->
      String;
    Ip ->
      ip_to_string(Ip)
  end.

ip_to_string(Ip) ->
  String = inet:ntoa(Ip),
  unicode:characters_to_binary(String).