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

-export([command/3, implement/2, execute/2, usage/1]).

-spec command(
    binary(),
    binary(),
    fun((outil@core:command(FCM)) -> outil@core:command(FCM))
) -> outil@core:command(FCM).
command(Name, Description, Continue) ->
    Continue(
        {command,
            Name,
            Description,
            [],
            [],
            fun(_) -> {error, {not_implemented, Name}} end}
    ).

-spec implement(
    outil@core:command(FCQ),
    fun((list(binary())) -> {ok, FCQ} | {error, outil@core:error()})
) -> outil@core:command(FCQ).
implement(Cmd, Run) ->
    {command,
        erlang:element(2, Cmd),
        erlang:element(3, Cmd),
        erlang:element(4, Cmd),
        erlang:element(5, Cmd),
        Run}.

-spec execute(outil@core:command(FCU), list(binary())) -> {ok, FCU} |
    {error, outil@core:error()}.
execute(Cmd, Args) ->
    (erlang:element(6, Cmd))(Args).

-spec usage(outil@core:command(any())) -> binary().
usage(Cmd) ->
    Args = begin
        _pipe = erlang:element(4, Cmd),
        _pipe@1 = gleam@list:map(_pipe, fun(Arg) -> erlang:element(2, Arg) end),
        _pipe@2 = gleam@list:map(
            _pipe@1,
            fun(Arg@1) -> <<<<"<"/utf8, Arg@1/binary>>/binary, ">"/utf8>> end
        ),
        gleam@string:join(_pipe@2, <<" "/utf8>>)
    end,
    Opts = begin
        _pipe@3 = erlang:element(5, Cmd),
        _pipe@4 = gleam@list:map(
            _pipe@3,
            fun(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>>
            end
        ),
        _pipe@5 = gleam@list:map(
            _pipe@4,
            fun(Opt@1) -> <<"  "/utf8, Opt@1/binary>> end
        ),
        gleam@string:join(_pipe@5, <<"\n"/utf8>>)
    end,
    Opts@1 = <<<<"Options:\n"/utf8, Opts/binary>>/binary, "\n"/utf8>>,
    <<<<<<<<<<<<<<(erlang:element(3, Cmd))/binary, "\n\n"/utf8>>/binary,
                            "Usage: "/utf8>>/binary,
                        (erlang:element(2, Cmd))/binary>>/binary,
                    " "/utf8>>/binary,
                Args/binary>>/binary,
            "\n\n"/utf8>>/binary,
        Opts@1/binary>>.

-spec opt_type(outil@core: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@core: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.