-module(outil@help).
-compile(no_auto_import).

-export([wrap_usage/2]).

-spec wrap_usage(
    outil:command(),
    fun((list(binary())) -> {ok, EUN} | {error, outil@error:reason()})
) -> {ok, EUN} | {error, outil:command_return(any())}.
wrap_usage(Cmd, Continue) ->
    Argv_contains = fun(S) -> gleam@list:contains(erlang:element(6, Cmd), S) end,
    case case Argv_contains(<<"--help"/utf8>>)
    orelse Argv_contains(<<"-h"/utf8>>) of
        true ->
            {error, {help, usage(Cmd, none)}};

        false ->
            {ok, erlang:element(6, Cmd)}
    end of
        {error, _try} -> {error, _try};
        {ok, Args} ->
            _pipe = Continue(Args),
            gleam@result:map_error(
                _pipe,
                fun(Reason) ->
                    Err_desc = case Reason of
                        {missing_argument, Opt} ->
                            <<"Missing argument for option: "/utf8, Opt/binary>>;

                        {malformed_argument, Opt@1, Value} ->
                            <<<<<<<<"Malformed argument for option: "/utf8,
                                            Opt@1/binary>>/binary,
                                        " ("/utf8>>/binary,
                                    Value/binary>>/binary,
                                ")"/utf8>>;

                        {out_of_place_option, Opt@2} ->
                            <<"Out of place option: "/utf8, Opt@2/binary>>
                    end,
                    {command_line_error, Reason, usage(Cmd, {some, Err_desc})}
                end
            )
    end.

-spec usage(outil:command(), gleam@option:option(binary())) -> binary().
usage(Cmd, Err_desc) ->
    Args = begin
        _pipe = erlang:element(4, Cmd),
        _pipe@1 = gleam@list:map(
            _pipe,
            fun(Arg) ->
                <<<<"<"/utf8, (erlang:element(2, Arg))/binary>>/binary,
                    ">"/utf8>>
            end
        ),
        gleam@string:join(_pipe@1, <<" "/utf8>>)
    end,
    Args@1 = case Args of
        <<""/utf8>> ->
            <<""/utf8>>;

        _ ->
            <<" "/utf8, Args/binary>>
    end,
    Usage = <<<<"\n\nUsage: "/utf8, (erlang:element(2, Cmd))/binary>>/binary,
        Args@1/binary>>,
    Opts = begin
        _pipe@2 = erlang:element(5, Cmd),
        _pipe@3 = gleam@list:map(_pipe@2, fun describe_opt/1),
        _pipe@4 = gleam@list:map(
            _pipe@3,
            fun(Opt) -> <<"  "/utf8, Opt/binary>> end
        ),
        gleam@string:join(_pipe@4, <<"\n"/utf8>>)
    end,
    Opts@1 = <<<<<<"\n\nOptions:\n"/utf8, Opts/binary>>/binary, "\n"/utf8>>/binary,
        "  -h, --help  Show this help text and exit."/utf8>>,
    Desc@1 = begin
        _pipe@5 = Err_desc,
        _pipe@6 = gleam@option:map(
            _pipe@5,
            fun(Desc) -> <<"ERROR! "/utf8, Desc/binary>> end
        ),
        gleam@option:unwrap(_pipe@6, erlang:element(3, Cmd))
    end,
    <<<<<<<<(erlang:element(2, Cmd))/binary, " -- "/utf8>>/binary,
                Desc@1/binary>>/binary,
            Usage/binary>>/binary,
        Opts@1/binary>>.

-spec describe_opt(outil:opt()) -> binary().
describe_opt(Opt) ->
    {opt, Long, Short, Desc, Value} = Opt,
    Short@1 = gleam@option:map(
        Short,
        fun(S) -> <<<<"-"/utf8, S/binary>>/binary, ", "/utf8>> end
    ),
    Short@2 = gleam@option:unwrap(Short@1, <<""/utf8>>),
    Long@1 = <<"--"/utf8, Long/binary>>,
    Typ = opt_type(Value),
    Default = show_default(Value),
    Meta = <<<<<<<<"("/utf8, Typ/binary>>/binary, ", default: "/utf8>>/binary,
            Default/binary>>/binary,
        ")"/utf8>>,
    <<<<<<<<<<Short@2/binary, Long@1/binary>>/binary, "  "/utf8>>/binary,
                Desc/binary>>/binary,
            " "/utf8>>/binary,
        Meta/binary>>.

-spec opt_type(outil:opt_value()) -> binary().
opt_type(Value) ->
    case Value of
        bool_opt ->
            <<"bool"/utf8>>;

        {float_opt, _} ->
            <<"float"/utf8>>;

        {int_opt, _} ->
            <<"int"/utf8>>;

        {string_opt, _} ->
            <<"string"/utf8>>
    end.

-spec show_default(outil:opt_value()) -> binary().
show_default(Value) ->
    case Value of
        bool_opt ->
            <<"false"/utf8>>;

        {float_opt, Default} ->
            gleam@float:to_string(Default);

        {int_opt, Default@1} ->
            gleam@int:to_string(Default@1);

        {string_opt, Default@2} ->
            <<<<"\""/utf8, Default@2/binary>>/binary, "\""/utf8>>
    end.