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

-export([is_lower_ascii/1, is_upper_ascii/1, is_digit/1, is_whitespace/1, is_alphanumeric/1, is_alphanumeric_or_dash_or_underscore/1, is_alphanumeric_or_dash_or_underscore_or_period/1, get_chars_matching_func/3, get_whitespace/1, get_name_ignore_ws/1, is_not_double_quote/1, is_not_single_quote/1, is_not_whitespace/1, is_not_gt/1]).

-spec is_lower_ascii(binary()) -> boolean().
is_lower_ascii(Grapheme) ->
    case Grapheme of
        <<"a"/utf8>> ->
            true;

        <<"b"/utf8>> ->
            true;

        <<"c"/utf8>> ->
            true;

        <<"d"/utf8>> ->
            true;

        <<"e"/utf8>> ->
            true;

        <<"f"/utf8>> ->
            true;

        <<"g"/utf8>> ->
            true;

        <<"h"/utf8>> ->
            true;

        <<"i"/utf8>> ->
            true;

        <<"j"/utf8>> ->
            true;

        <<"k"/utf8>> ->
            true;

        <<"l"/utf8>> ->
            true;

        <<"m"/utf8>> ->
            true;

        <<"n"/utf8>> ->
            true;

        <<"o"/utf8>> ->
            true;

        <<"p"/utf8>> ->
            true;

        <<"q"/utf8>> ->
            true;

        <<"r"/utf8>> ->
            true;

        <<"s"/utf8>> ->
            true;

        <<"t"/utf8>> ->
            true;

        <<"u"/utf8>> ->
            true;

        <<"v"/utf8>> ->
            true;

        <<"w"/utf8>> ->
            true;

        <<"x"/utf8>> ->
            true;

        <<"y"/utf8>> ->
            true;

        <<"z"/utf8>> ->
            true;

        _ ->
            false
    end.

-spec is_upper_ascii(binary()) -> boolean().
is_upper_ascii(Grapheme) ->
    case Grapheme of
        <<"A"/utf8>> ->
            true;

        <<"B"/utf8>> ->
            true;

        <<"C"/utf8>> ->
            true;

        <<"D"/utf8>> ->
            true;

        <<"E"/utf8>> ->
            true;

        <<"F"/utf8>> ->
            true;

        <<"G"/utf8>> ->
            true;

        <<"H"/utf8>> ->
            true;

        <<"I"/utf8>> ->
            true;

        <<"J"/utf8>> ->
            true;

        <<"K"/utf8>> ->
            true;

        <<"L"/utf8>> ->
            true;

        <<"M"/utf8>> ->
            true;

        <<"N"/utf8>> ->
            true;

        <<"O"/utf8>> ->
            true;

        <<"P"/utf8>> ->
            true;

        <<"Q"/utf8>> ->
            true;

        <<"R"/utf8>> ->
            true;

        <<"S"/utf8>> ->
            true;

        <<"T"/utf8>> ->
            true;

        <<"U"/utf8>> ->
            true;

        <<"V"/utf8>> ->
            true;

        <<"W"/utf8>> ->
            true;

        <<"X"/utf8>> ->
            true;

        <<"Y"/utf8>> ->
            true;

        <<"Z"/utf8>> ->
            true;

        _ ->
            false
    end.

-spec is_digit(binary()) -> boolean().
is_digit(Grapheme) ->
    case Grapheme of
        <<"0"/utf8>> ->
            true;

        <<"1"/utf8>> ->
            true;

        <<"2"/utf8>> ->
            true;

        <<"3"/utf8>> ->
            true;

        <<"4"/utf8>> ->
            true;

        <<"5"/utf8>> ->
            true;

        <<"6"/utf8>> ->
            true;

        <<"7"/utf8>> ->
            true;

        <<"8"/utf8>> ->
            true;

        <<"9"/utf8>> ->
            true;

        _ ->
            false
    end.

-spec is_whitespace(binary()) -> boolean().
is_whitespace(Grapheme) ->
    case Grapheme of
        <<" "/utf8>> ->
            true;

        <<"\t"/utf8>> ->
            true;

        <<"\r"/utf8>> ->
            true;

        <<"\n"/utf8>> ->
            true;

        _ ->
            false
    end.

-spec is_alphanumeric(binary()) -> boolean().
is_alphanumeric(Grapheme) ->
    case (is_lower_ascii(Grapheme) orelse is_upper_ascii(Grapheme)) orelse is_digit(
        Grapheme
    ) of
        true ->
            true;

        _ ->
            false
    end.

-spec is_alphanumeric_or_dash_or_underscore(binary()) -> boolean().
is_alphanumeric_or_dash_or_underscore(Grapheme) ->
    case (is_alphanumeric(Grapheme) orelse (Grapheme =:= <<"_"/utf8>>)) orelse (Grapheme
    =:= <<"-"/utf8>>) of
        true ->
            true;

        _ ->
            false
    end.

-spec is_alphanumeric_or_dash_or_underscore_or_period(binary()) -> boolean().
is_alphanumeric_or_dash_or_underscore_or_period(Grapheme) ->
    case is_alphanumeric_or_dash_or_underscore(Grapheme) orelse (Grapheme =:= <<"."/utf8>>) of
        true ->
            true;

        _ ->
            false
    end.

-spec get_chars_matching_func(binary(), binary(), fun((binary()) -> boolean())) -> {binary(),
    binary()}.
get_chars_matching_func(S, Acc, Match_func) ->
    case gleam@string:pop_grapheme(S) of
        {ok, {Grapheme, Rest}} ->
            case Match_func(Grapheme) of
                true ->
                    get_chars_matching_func(
                        Rest,
                        <<Acc/binary, Grapheme/binary>>,
                        Match_func
                    );

                false ->
                    {Acc, S}
            end;

        {error, _} ->
            {Acc, S}
    end.

-spec get_whitespace(binary()) -> {binary(), binary()}.
get_whitespace(S) ->
    get_chars_matching_func(S, <<""/utf8>>, fun is_whitespace/1).

-spec get_name_ignore_ws(binary()) -> {binary(), binary(), integer()}.
get_name_ignore_ws(S) ->
    I = 0,
    {Whitespace_chars, Rest} = get_whitespace(S),
    I@1 = I + gleam@string:length(Whitespace_chars),
    {Name_graphemes, Rest@1} = get_chars_matching_func(
        Rest,
        <<""/utf8>>,
        fun is_alphanumeric_or_dash_or_underscore/1
    ),
    I@2 = I@1 + gleam@string:length(Name_graphemes),
    {Whitespace_chars@1, Rest@2} = get_whitespace(Rest@1),
    I@3 = I@2 + gleam@string:length(Whitespace_chars@1),
    {Name_graphemes, Rest@2, I@3}.

-spec is_not_double_quote(binary()) -> boolean().
is_not_double_quote(Grapheme) ->
    case Grapheme of
        <<"\""/utf8>> ->
            false;

        _ ->
            true
    end.

-spec is_not_single_quote(binary()) -> boolean().
is_not_single_quote(Grapheme) ->
    case Grapheme of
        <<"'"/utf8>> ->
            false;

        _ ->
            true
    end.

-spec is_not_whitespace(binary()) -> boolean().
is_not_whitespace(Grapheme) ->
    case is_whitespace(Grapheme) of
        true ->
            false;

        _ ->
            true
    end.

-spec is_not_gt(binary()) -> boolean().
is_not_gt(Grapheme) ->
    case Grapheme of
        <<">"/utf8>> ->
            false;

        _ ->
            true
    end.