-module(ffi@file).
-compile(no_auto_import).

-export([open_file/2, open_file_exclusive/1, write_file/2, open_and_write_exclusive/2, ensure_dir/1]).
-export_type([io_device/0, file_mode/0, write_result/0]).

-type io_device() :: any().

-type file_mode() :: read | write | append | exclusive.

-type write_result() :: ok | {error, gleam@erlang@file:reason()}.

-spec open_file(binary(), list(file_mode())) -> {ok, io_device()} |
    {error, gleam@erlang@file:reason()}.
open_file(A, B) ->
    file:open(A, B).

-spec open_file_exclusive(binary()) -> {ok, io_device()} |
    {error, gleam@erlang@file:reason()}.
open_file_exclusive(S) ->
    file:open(S, [exclusive]).

-spec write_file(io_device(), binary()) -> {ok, nil} |
    {error, gleam@erlang@file:reason()}.
write_file(Iod, S) ->
    case file:write(Iod, gleam@erlang@charlist:from_string(S)) of
        ok ->
            {ok, nil};

        {error, Reason} ->
            {error, Reason}
    end.

-spec open_and_write_exclusive(binary(), binary()) -> {ok, nil} |
    {error, gleam@erlang@file:reason()}.
open_and_write_exclusive(Path, Contents) ->
    case open_file_exclusive(Path) of
        {error, _try} -> {error, _try};
        {ok, Iod} ->
            write_file(Iod, Contents)
    end.

-spec ensure_dir(binary()) -> {ok, nil} | {error, gleam@erlang@file:reason()}.
ensure_dir(Dir) ->
    case filelib:ensure_dir(Dir) of
        ok ->
            {ok, nil};

        {error, Reason} ->
            {error, Reason}
    end.