-module(utils@tally_counter).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([start/0, stop/1, increment/1, get_count/1]).
-export_type([state/0, message/0]).

-opaque state() :: {state, integer()}.

-opaque message() :: shutdown |
    increment |
    {get_count, gleam@erlang@process:subject(integer())}.

-spec handle_message(message(), state()) -> gleam@otp@actor:next(message(), state()).
handle_message(Message, State) ->
    case Message of
        shutdown ->
            {stop, normal};

        increment ->
            gleam@otp@actor:continue({state, erlang:element(2, State) + 1});

        {get_count, Reply_with} ->
            gleam@erlang@process:send(Reply_with, erlang:element(2, State)),
            gleam@otp@actor:continue(State)
    end.

-spec start() -> {ok, gleam@erlang@process:subject(message())} |
    {error, gleam@otp@actor:start_error()}.
start() ->
    gleam@otp@actor:start({state, 0}, fun handle_message/2).

-spec stop(gleam@erlang@process:subject(message())) -> nil.
stop(Actor) ->
    gleam@otp@actor:send(Actor, shutdown).

-spec increment(gleam@erlang@process:subject(message())) -> nil.
increment(Actor) ->
    gleam@otp@actor:send(Actor, increment).

-spec get_count(gleam@erlang@process:subject(message())) -> integer().
get_count(Actor) ->
    gleam@erlang@process:call(
        Actor,
        fun(_capture) -> {get_count, _capture} end,
        1000
    ).