-module(chip).
-compile([no_auto_import, nowarn_unused_vars]).

-export([all/1, lookup/2, register/2, register_as/3, deregister/2, stop/1, start/0]).
-export_type([action/2, state/2]).

-opaque action(GVS, GVT) :: {all,
        gleam@erlang@process:subject(list(gleam@erlang@process:subject(GVT)))} |
    {lookup,
        gleam@erlang@process:subject(list(gleam@erlang@process:subject(GVT))),
        GVS} |
    {register, gleam@erlang@process:subject(GVT)} |
    {register_as, gleam@erlang@process:subject(GVT), GVS} |
    {deregister, GVS} |
    {demonitor, gleam@erlang@process:subject(GVT)} |
    {stop, gleam@erlang@process:subject(gleam@erlang@process:exit_reason())}.

-type state(GVU, GVV) :: {state,
        gleam@map:map_(gleam@erlang@process:subject(GVU), gleam@erlang@process:process_monitor()),
        gleam@map:map_(GVV, gleam@set:set(gleam@erlang@process:subject(GVU))),
        gleam@erlang@process:selector(action(GVV, GVU))}.

-spec all(gleam@erlang@process:subject(action(any(), GWE))) -> list(gleam@erlang@process:subject(GWE)).
all(Registry) ->
    gleam@erlang@process:call(
        Registry,
        fun(_capture) -> {all, _capture} end,
        100
    ).

-spec lookup(gleam@erlang@process:subject(action(GWK, GWL)), GWK) -> list(gleam@erlang@process:subject(GWL)).
lookup(Registry, Name) ->
    gleam@erlang@process:call(
        Registry,
        fun(_capture) -> {lookup, _capture, Name} end,
        100
    ).

-spec register(
    gleam@erlang@process:subject(action(any(), GWS)),
    fun(() -> {ok, gleam@erlang@process:subject(GWS)} |
        {error, gleam@otp@actor:start_error()})
) -> {ok, gleam@erlang@process:subject(GWS)} |
    {error, gleam@otp@actor:start_error()}.
register(Registry, Start) ->
    gleam@result:'try'(
        Start(),
        fun(Subject) ->
            gleam@erlang@process:send(Registry, {register, Subject}),
            {ok, Subject}
        end
    ).

-spec register_as(
    gleam@erlang@process:subject(action(GXC, GXD)),
    GXC,
    fun(() -> {ok, gleam@erlang@process:subject(GXD)} |
        {error, gleam@otp@actor:start_error()})
) -> {ok, gleam@erlang@process:subject(GXD)} |
    {error, gleam@otp@actor:start_error()}.
register_as(Registry, Name, Start) ->
    gleam@result:'try'(
        Start(),
        fun(Subject) ->
            gleam@erlang@process:send(Registry, {register_as, Subject, Name}),
            {ok, Subject}
        end
    ).

-spec deregister(gleam@erlang@process:subject(action(GXN, any())), GXN) -> nil.
deregister(Registry, Name) ->
    gleam@erlang@process:send(Registry, {deregister, Name}).

-spec stop(gleam@erlang@process:subject(action(any(), any()))) -> gleam@erlang@process:exit_reason().
stop(Registry) ->
    gleam@erlang@process:call(
        Registry,
        fun(_capture) -> {stop, _capture} end,
        10
    ).

-spec demonitor_subject(state(GYY, GYZ), gleam@erlang@process:subject(GYY)) -> state(GYY, GYZ).
demonitor_subject(State, Subject) ->
    case gleam@map:get(erlang:element(2, State), Subject) of
        {ok, Monitor} ->
            gleam_erlang_ffi:demonitor(Monitor),
            Group = gleam@map:delete(erlang:element(2, State), Subject),
            Named = gleam@map:map_values(
                erlang:element(3, State),
                fun(_, Subjects) -> gleam@set:delete(Subjects, Subject) end
            ),
            State@1 = erlang:setelement(
                3,
                erlang:setelement(2, State, Group),
                Named
            ),
            State@1;

        {error, nil} ->
            State
    end.

-spec get_name(
    gleam@map:map_(GZF, gleam@set:set(gleam@erlang@process:subject(GZG))),
    GZF
) -> gleam@set:set(gleam@erlang@process:subject(GZG)).
get_name(Named, Name) ->
    case gleam@map:get(Named, Name) of
        {ok, Subjects} ->
            Subjects;

        {error, nil} ->
            gleam@set:new()
    end.

-spec delete_named(state(GYS, GYT), GYT) -> state(GYS, GYT).
delete_named(State, Name) ->
    Other_named = gleam@map:delete(erlang:element(3, State), Name),
    Other_subjects = gleam@map:fold(
        Other_named,
        gleam@set:new(),
        fun(All_subjects, _, Subjects) ->
            gleam@set:union(All_subjects, Subjects)
        end
    ),
    Subjects@1 = get_name(erlang:element(3, State), Name),
    Subjects_to_keep = begin
        _pipe = gleam@set:intersection(Subjects@1, Other_subjects),
        gleam@set:to_list(_pipe)
    end,
    Subjects_to_delete = begin
        _pipe@1 = gleam@set:drop(Subjects@1, Subjects_to_keep),
        gleam@set:to_list(_pipe@1)
    end,
    Monitors = begin
        _pipe@2 = erlang:element(2, State),
        _pipe@3 = gleam@map:take(_pipe@2, Subjects_to_delete),
        gleam@map:values(_pipe@3)
    end,
    gleam@list:each(Monitors, fun gleam_erlang_ffi:demonitor/1),
    Group = gleam@map:drop(erlang:element(2, State), Subjects_to_delete),
    Named = gleam@map:delete(erlang:element(3, State), Name),
    erlang:setelement(3, erlang:setelement(2, State, Group), Named).

-spec capture_process_down(
    gleam@erlang@process:selector(action(GZN, GZO)),
    gleam@erlang@process:process_monitor(),
    gleam@erlang@process:subject(GZO)
) -> gleam@erlang@process:selector(action(GZN, GZO)).
capture_process_down(Selector, Monitor, Subject) ->
    Handle = fun(_) -> {demonitor, Subject} end,
    gleam@erlang@process:selecting_process_down(Selector, Monitor, Handle).

-spec insert(
    state(GYE, GYF),
    gleam@erlang@process:subject(GYE),
    gleam@erlang@process:process_monitor()
) -> state(GYE, GYF).
insert(State, Subject, Monitor) ->
    Group = gleam@map:insert(erlang:element(2, State), Subject, Monitor),
    Selector = capture_process_down(erlang:element(4, State), Monitor, Subject),
    erlang:setelement(4, erlang:setelement(2, State, Group), Selector).

-spec insert_as(
    state(GYL, GYM),
    gleam@erlang@process:subject(GYL),
    gleam@erlang@process:process_monitor(),
    GYM
) -> state(GYL, GYM).
insert_as(State, Subject, Monitor, Name) ->
    Subjects = begin
        _pipe = erlang:element(3, State),
        _pipe@1 = get_name(_pipe, Name),
        gleam@set:insert(_pipe@1, Subject)
    end,
    Named = gleam@map:insert(erlang:element(3, State), Name, Subjects),
    _pipe@2 = erlang:setelement(3, State, Named),
    insert(_pipe@2, Subject, Monitor).

-spec handle_message(action(GXX, GXY), state(GXY, GXX)) -> gleam@otp@actor:next(action(GXX, GXY), state(GXY, GXX)).
handle_message(Message, State) ->
    case Message of
        {all, Client} ->
            Subjects = gleam@map:keys(erlang:element(2, State)),
            gleam@erlang@process:send(Client, Subjects),
            gleam@otp@actor:continue(State);

        {lookup, Client@1, Name} ->
            Subjects@1 = begin
                _pipe = erlang:element(3, State),
                _pipe@1 = get_name(_pipe, Name),
                gleam@set:to_list(_pipe@1)
            end,
            gleam@erlang@process:send(Client@1, Subjects@1),
            gleam@otp@actor:continue(State);

        {register, Subject} ->
            Monitor = begin
                _pipe@2 = Subject,
                _pipe@3 = gleam@erlang@process:subject_owner(_pipe@2),
                gleam@erlang@process:monitor_process(_pipe@3)
            end,
            State@1 = insert(State, Subject, Monitor),
            _pipe@4 = gleam@otp@actor:continue(State@1),
            gleam@otp@actor:with_selector(_pipe@4, erlang:element(4, State@1));

        {register_as, Subject@1, Name@1} ->
            Monitor@1 = begin
                _pipe@5 = Subject@1,
                _pipe@6 = gleam@erlang@process:subject_owner(_pipe@5),
                gleam@erlang@process:monitor_process(_pipe@6)
            end,
            State@2 = insert_as(State, Subject@1, Monitor@1, Name@1),
            _pipe@7 = gleam@otp@actor:continue(State@2),
            gleam@otp@actor:with_selector(_pipe@7, erlang:element(4, State@2));

        {deregister, Name@2} ->
            State@3 = begin
                _pipe@8 = State,
                delete_named(_pipe@8, Name@2)
            end,
            _pipe@9 = gleam@otp@actor:continue(State@3),
            gleam@otp@actor:with_selector(_pipe@9, erlang:element(4, State@3));

        {demonitor, Subject@2} ->
            State@4 = begin
                _pipe@10 = State,
                demonitor_subject(_pipe@10, Subject@2)
            end,
            _pipe@11 = gleam@otp@actor:continue(State@4),
            gleam@otp@actor:with_selector(_pipe@11, erlang:element(4, State@4));

        {stop, Client@2} ->
            gleam@erlang@process:send(Client@2, normal),
            {stop, normal}
    end.

-spec start() -> {ok, gleam@erlang@process:subject(action(any(), any()))} |
    {error, gleam@otp@actor:start_error()}.
start() ->
    gleam@otp@actor:start(
        {state,
            gleam@map:new(),
            gleam@map:new(),
            gleam_erlang_ffi:new_selector()},
        fun handle_message/2
    ).