-module(testbldr).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([named/2, include_passing_tests_in_output/2, output_results_to_file/2, output_results_to_stdout/1, display_test_outcome_using/2, display_ratio_using/2, run/2, test_runner_default/0]).
-export_type([test/0, test_outcome/0, test_runner/0, verbosity/0, output_destination/0, test_stats/0]).

-type test() :: {test, binary(), fun(() -> test_outcome())}.

-type test_outcome() :: pass | {fail, binary()}.

-opaque test_runner() :: {test_runner,
        verbosity(),
        gleam@set:set(output_destination()),
        gleam@option:option(fun((binary(), test_outcome()) -> binary())),
        gleam@option:option(fun((integer(), integer()) -> binary()))}.

-type verbosity() :: normal | verbose.

-type output_destination() :: stdout | {file, binary()}.

-type test_stats() :: {test_stats,
        integer(),
        integer(),
        integer(),
        integer(),
        list({binary(), test_outcome()})}.

-spec named(binary(), fun(() -> test_outcome())) -> test().
named(Name, New_test) ->
    {test, Name, New_test}.

-spec include_passing_tests_in_output(test_runner(), boolean()) -> test_runner().
include_passing_tests_in_output(Runner, Input) ->
    Verbosity = case Input of
        true ->
            verbose;

        false ->
            normal
    end,
    erlang:setelement(2, Runner, Verbosity).

-spec output_results_to_file(test_runner(), binary()) -> test_runner().
output_results_to_file(Runner, Path) ->
    erlang:setelement(
        3,
        Runner,
        gleam@set:insert(erlang:element(3, Runner), {file, Path})
    ).

-spec output_results_to_stdout(test_runner()) -> test_runner().
output_results_to_stdout(Runner) ->
    erlang:setelement(
        3,
        Runner,
        gleam@set:insert(erlang:element(3, Runner), stdout)
    ).

-spec display_test_outcome_using(
    test_runner(),
    fun((binary(), test_outcome()) -> binary())
) -> test_runner().
display_test_outcome_using(Runner, Printer) ->
    erlang:setelement(4, Runner, {some, Printer}).

-spec display_ratio_using(
    test_runner(),
    fun((integer(), integer()) -> binary())
) -> test_runner().
display_ratio_using(Runner, Printer) ->
    erlang:setelement(5, Runner, {some, Printer}).

-spec write_stats_to_file(test_runner(), test_stats(), binary()) -> {ok, nil} |
    {error, simplifile:file_error()}.
write_stats_to_file(Runner, Stats, Path) ->
    Individual = (gleam@list:fold(
        erlang:element(6, Stats),
        <<""/utf8>>,
        fun(Acc, _use1) ->
            {Name, Outcome} = _use1,
            case erlang:element(4, Runner) of
                {some, Printer} ->
                    <<<<Acc/binary, (Printer(Name, Outcome))/binary>>/binary,
                        "\n"/utf8>>;

                none ->
                    Acc
            end
        end
    )),
    Ratio = case erlang:element(5, Runner) of
        {some, Printer@1} ->
            Printer@1(erlang:element(3, Stats), erlang:element(2, Stats));

        none ->
            <<""/utf8>>
    end,
    simplifile:write(
        Path,
        <<<<Individual/binary, "\n"/utf8>>/binary, Ratio/binary>>
    ).

-spec write_stats_to_stdout(test_runner(), test_stats()) -> nil.
write_stats_to_stdout(Runner, Stats) ->
    (gleam@list:each(
        erlang:element(6, Stats),
        fun(_use0) ->
            {Name, Outcome} = _use0,
            case erlang:element(4, Runner) of
                {some, Printer} ->
                    _pipe = Printer(Name, Outcome),
                    gleam@io:println(_pipe);

                none ->
                    nil
            end
        end
    )),
    gleam@io:println(<<""/utf8>>),
    case erlang:element(5, Runner) of
        {some, Printer@1} ->
            _pipe@1 = Printer@1(
                erlang:element(3, Stats),
                erlang:element(2, Stats)
            ),
            gleam@io:println(_pipe@1);

        none ->
            nil
    end.

-spec run(test_runner(), list(test())) -> nil.
run(Runner, Tests) ->
    Test_stats = (gleam@list:fold(
        Tests,
        {test_stats, 0, 0, 0, 0, []},
        fun(Acc, _use1) ->
            {test, Name, Test_function} = _use1,
            case gleam_erlang_ffi:rescue(Test_function) of
                {ok, pass} ->
                    {test_stats,
                        erlang:element(2, Acc) + 1,
                        erlang:element(3, Acc) + 1,
                        erlang:element(4, Acc),
                        erlang:element(5, Acc),
                        [{Name, pass} | erlang:element(6, Acc)]};

                {ok, {fail, Msg}} ->
                    {test_stats,
                        erlang:element(2, Acc) + 1,
                        erlang:element(3, Acc),
                        erlang:element(4, Acc) + 1,
                        erlang:element(5, Acc),
                        [{Name, {fail, Msg}} | erlang:element(6, Acc)]};

                {error, _} ->
                    {test_stats,
                        erlang:element(2, Acc) + 1,
                        erlang:element(3, Acc),
                        erlang:element(4, Acc),
                        erlang:element(5, Acc) + 1,
                        [{Name, {fail, <<"Test Panicked!"/utf8>>}} |
                            erlang:element(6, Acc)]}
            end
        end
    )),
    Filter = case erlang:element(2, Runner) of
        normal ->
            fun(X) -> case erlang:element(2, X) of
                    pass ->
                        false;

                    {fail, _} ->
                        true
                end end;

        verbose ->
            fun(_) -> true end
    end,
    Filtered_stats = erlang:setelement(
        6,
        Test_stats,
        gleam@list:filter(erlang:element(6, Test_stats), Filter)
    ),
    (gleam@list:each(
        gleam@set:to_list(erlang:element(3, Runner)),
        fun(Dest) -> case Dest of
                stdout ->
                    write_stats_to_stdout(Runner, Filtered_stats);

                {file, Path} ->
                    _assert_subject = write_stats_to_file(
                        Runner,
                        Filtered_stats,
                        Path
                    ),
                    {ok, _} = case _assert_subject of
                        {ok, _} -> _assert_subject;
                        _assert_fail ->
                            erlang:error(#{gleam_error => let_assert,
                                        message => <<"Assertion pattern match failed"/utf8>>,
                                        value => _assert_fail,
                                        module => <<"testbldr"/utf8>>,
                                        function => <<"run"/utf8>>,
                                        line => 172})
                    end,
                    nil
            end end
    )).

-spec outcome_to_string(binary(), test_outcome()) -> binary().
outcome_to_string(Name, Outcome) ->
    case Outcome of
        pass ->
            <<"✅ "/utf8, Name/binary>>;

        {fail, Msg} ->
            <<<<<<<<"❌ "/utf8, Name/binary>>/binary, ": Failed ("/utf8>>/binary,
                    Msg/binary>>/binary,
                ")"/utf8>>
    end.

-spec ratio_to_string(integer(), integer()) -> binary().
ratio_to_string(Passed, Total) ->
    Prefix_emoji = case Passed =:= Total of
        true ->
            <<"✅"/utf8>>;

        false ->
            <<"❌"/utf8>>
    end,
    <<<<<<<<<<Prefix_emoji/binary, " "/utf8>>/binary,
                    (gleam@int:to_string(Passed))/binary>>/binary,
                "/"/utf8>>/binary,
            (gleam@int:to_string(Total))/binary>>/binary,
        " tests passed"/utf8>>.

-spec test_runner_default() -> test_runner().
test_runner_default() ->
    {test_runner,
        normal,
        gleam@set:from_list([stdout]),
        {some, fun outcome_to_string/2},
        {some, fun ratio_to_string/2}}.