-module(themis@internal@metric).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([make_histogram_metric_names/1, name_to_string/1, is_valid_name/1, new_name/2]).
-export_type([metric_error/0, metric_name/0]).

-type metric_error() :: {invalid_metric_name, binary()} |
    {invalid_word_in_name, binary()}.

-opaque metric_name() :: {metric_name, binary()}.

-file("/git/Themis/src/themis/internal/metric.gleam", 60).
-spec make_histogram_metric_names(metric_name()) -> {metric_name(),
    metric_name(),
    metric_name()}.
make_histogram_metric_names(From) ->
    Base_name = erlang:element(2, From),
    {{metric_name, <<Base_name/binary, "_bucket"/utf8>>},
        {metric_name, <<Base_name/binary, "_count"/utf8>>},
        {metric_name, <<Base_name/binary, "_sum"/utf8>>}}.

-file("/git/Themis/src/themis/internal/metric.gleam", 71).
-spec name_to_string(metric_name()) -> binary().
name_to_string(From) ->
    erlang:element(2, From).

-file("/git/Themis/src/themis/internal/metric.gleam", 32).
-spec is_valid_name(binary()) -> boolean().
is_valid_name(Name) ->
    _assert_subject = begin
        _pipe = <<"^[a-zA-Z][a-zA-Z0-9_:]*$"/utf8>>,
        gleam@regexp:from_string(_pipe)
    end,
    {ok, Reg} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        value => _assert_fail,
                        module => <<"themis/internal/metric"/utf8>>,
                        function => <<"is_valid_name"/utf8>>,
                        line => 33})
    end,
    begin
        _pipe@1 = Reg,
        gleam@regexp:check(_pipe@1, Name)
    end
    andalso begin
        _pipe@2 = gleam@list:map(
            [<<"_count"/utf8>>, <<"_sum"/utf8>>, <<"_bucket"/utf8>>],
            fun(Word) -> not gleam_stdlib:string_ends_with(Name, Word) end
        ),
        gleam@list:all(_pipe@2, fun gleam@function:identity/1)
    end.

-file("/git/Themis/src/themis/internal/metric.gleam", 42).
-spec new_name(binary(), list(binary())) -> {ok, metric_name()} |
    {error, metric_error()}.
new_name(From, Blacklist) ->
    R = begin
        gleam@list:try_each(
            Blacklist,
            fun(Word) -> case gleam_stdlib:contains_string(From, Word) of
                    false ->
                        {ok, nil};

                    true ->
                        {error, {invalid_word_in_name, Word}}
                end end
        )
    end,
    gleam@result:'try'(R, fun(_) -> case is_valid_name(From) of
                false ->
                    {error, {invalid_metric_name, From}};

                true ->
                    {ok, {metric_name, From}}
            end end).