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

-export([new/0, print/1, from_dict/1, add_label/3, delete_label/2]).
-export_type([label_name/0, label_set/0, label_error/0]).

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

-opaque label_set() :: {label_set, gleam@dict:dict(label_name(), binary())}.

-type label_error() :: invalid_label_name.

-file("/git/Themis/src/internal/label.gleam", 32).
-spec new() -> label_set().
new() ->
    {label_set, maps:new()}.

-file("/git/Themis/src/internal/label.gleam", 53).
-spec print(label_set()) -> binary().
print(Labels) ->
    _pipe = (gleam@dict:fold(
        erlang:element(2, Labels),
        [<<"{"/utf8>>],
        fun(Current, Name, Value) ->
            [<<<<<<(erlang:element(2, Name))/binary, "=\""/utf8>>/binary,
                        Value/binary>>/binary,
                    "\","/utf8>> |
                Current]
        end
    )),
    _pipe@1 = lists:reverse(_pipe),
    _pipe@2 = gleam_stdlib:identity(_pipe@1),
    _pipe@3 = unicode:characters_to_binary(_pipe@2),
    _pipe@4 = gleam@string:drop_end(_pipe@3, 1),
    gleam@string:append(_pipe@4, <<"}"/utf8>>).

-file("/git/Themis/src/internal/label.gleam", 65).
-spec new_label_name(binary()) -> {ok, label_name()} | {error, label_error()}.
new_label_name(From) ->
    case internal@prometheus:is_valid_label(From) of
        false ->
            {error, invalid_label_name};

        true ->
            {ok, {label_name, From}}
    end.

-file("/git/Themis/src/internal/label.gleam", 20).
-spec from_dict(gleam@dict:dict(binary(), binary())) -> {ok, label_set()} |
    {error, label_error()}.
from_dict(Labels) ->
    R = (gleam@list:try_map(
        maps:to_list(Labels),
        fun(_use0) ->
            {Name_string, Value} = _use0,
            gleam@result:'try'(
                new_label_name(Name_string),
                fun(Name) -> {ok, {Name, Value}} end
            )
        end
    )),
    gleam@result:map(
        R,
        fun(Checked_dict) -> {label_set, maps:from_list(Checked_dict)} end
    ).

-file("/git/Themis/src/internal/label.gleam", 36).
-spec add_label(label_set(), binary(), binary()) -> {ok, label_set()} |
    {error, label_error()}.
add_label(Labels, Key, Value) ->
    gleam@result:map(
        new_label_name(Key),
        fun(Label_name) ->
            {label_set,
                gleam@dict:insert(erlang:element(2, Labels), Label_name, Value)}
        end
    ).

-file("/git/Themis/src/internal/label.gleam", 45).
-spec delete_label(label_set(), binary()) -> {ok, label_set()} |
    {error, label_error()}.
delete_label(Labels, Key) ->
    gleam@result:map(
        new_label_name(Key),
        fun(Label_name) ->
            {label_set,
                gleam@dict:delete(erlang:element(2, Labels), Label_name)}
        end
    ).