-module(mynifmod).

-include_lib("eunit/include/eunit.hrl").


%%-export([init/0]).
-on_load(init/0).

init() ->
    {ok, Lib} = find_library("mynifmod", "mynifmod"),
    ok = erlang:load_nif(Lib, 0).

%% butchered version of https://github.com/goertzenator/find_crate/blob/master/src/find_crate.erl
find_library(CrateName, LibName) ->
    Wildcard = "priv/crates/" ++ CrateName ++ "/{lib,}" ++ LibName ++ ".{so,dll}",
    case filelib:wildcard(Wildcard) of
        [Lib] -> {ok, filename:rootname(Lib)};
        [] -> {error, not_found};
        _ -> {error, multiple_matches}
    end.

exercise_dtor(0) ->
    garbage_collect(), %% don't crash
    rustmap_dtor_count();
exercise_dtor(N) ->
    rustmap(),  %% create and discard a resource
    exercise_dtor(N - 1).

simple_test_() -> [
        ?_assertEqual(6, times2(3)),
        ?_assertEqual(self(), test_enif_make_pid()),
        fun() -> rustmap() end,
        ?_assertEqual(11, exercise_dtor(10)),
        ?_assertEqual("123", to_str(123)),
        ?_assertEqual("[\"hello\",world]", to_str(["hello", world])),
        ?_assertEqual(hash(hash_this), hash(hash_this)),
        ?_assertEqual(hash(and_this), hash(and_this)),
        ?_assertNotEqual(hash(hash_this), hash(and_this)),
        ?_assertEqual(hash(394749857), hash(394749857)),
        ?_assertNotEqual(hash(394749857), hash(394749858)),
        ?_assertEqual(make_map(), #{one=>1, two=>2, three=>3})
    ].


times2(_X)           -> exit(nif_library_not_loaded).
test_enif_make_pid() -> exit(nif_library_not_loaded).
rustmap()            -> exit(nif_library_not_loaded).
rustmap_dtor_count() -> exit(nif_library_not_loaded).
to_str(_X)           -> exit(nif_library_not_loaded).
hash(_X)             -> exit(nif_library_not_loaded).
make_map()           -> exit(nif_library_not_loaded).