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

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

-opaque message(HCK, HCL) :: {all,
        gleam@erlang@process:subject(list(gleam@erlang@process:subject(HCL)))} |
    {named,
        gleam@erlang@process:subject(list({HCK,
            gleam@erlang@process:subject(HCL)}))} |
    {lookup,
        gleam@erlang@process:subject(list(gleam@erlang@process:subject(HCL))),
        HCK} |
    {register, gleam@erlang@process:subject(HCL)} |
    {register_as, gleam@erlang@process:subject(HCL), HCK} |
    {deregister, HCK} |
    {demonitor, gleam@erlang@process:subject(HCL)} |
    rebuild_selector |
    {stop, gleam@erlang@process:subject(gleam@erlang@process:exit_reason())}.

-type state(HCM, HCN) :: {state,
        gleam@erlang@process:subject(message(HCM, HCN)),
        gleam@dict:dict(gleam@erlang@process:pid_(), gleam@erlang@process:process_monitor()),
        gleam@set:set(gleam@erlang@process:subject(HCN)),
        gleam@dict:dict(HCM, gleam@set:set(gleam@erlang@process:subject(HCN))),
        gleam@erlang@process:selector(message(HCM, HCN))}.

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

-spec named(gleam@erlang@process:subject(message(HDC, HDD))) -> list({HDC,
    gleam@erlang@process:subject(HDD)}).
named(Registry) ->
    gleam@erlang@process:call(
        Registry,
        fun(_capture) -> {named, _capture} end,
        100
    ).

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

-spec register(
    gleam@erlang@process:subject(message(any(), HDR)),
    fun(() -> {ok, gleam@erlang@process:subject(HDR)} |
        {error, gleam@otp@actor:start_error()})
) -> {ok, gleam@erlang@process:subject(HDR)} |
    {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(message(HEB, HEC)),
    HEB,
    fun(() -> {ok, gleam@erlang@process:subject(HEC)} |
        {error, gleam@otp@actor:start_error()})
) -> {ok, gleam@erlang@process:subject(HEC)} |
    {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(message(HEM, any())), HEM) -> nil.
deregister(Registry, Name) ->
    gleam@erlang@process:send(Registry, {deregister, Name}).

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

-spec handle_init() -> gleam@otp@actor:init_result(state(HEW, HEX), message(HEW, HEX)).
handle_init() ->
    Subject = gleam@erlang@process:new_subject(),
    Selector = begin
        _pipe = gleam_erlang_ffi:new_selector(),
        gleam@erlang@process:selecting(
            _pipe,
            Subject,
            fun gleam@function:identity/1
        )
    end,
    State = {state,
        Subject,
        gleam@dict:new(),
        gleam@set:new(),
        gleam@dict:new(),
        Selector},
    {ready, State, Selector}.

-spec demonitor_subject(state(HGF, HGG), gleam@erlang@process:subject(HGG)) -> state(HGF, HGG).
demonitor_subject(State, Subject) ->
    Pid = gleam@erlang@process:subject_owner(Subject),
    case gleam@dict:get(erlang:element(3, State), Pid) of
        {ok, Monitor} ->
            gleam_erlang_ffi:demonitor(Monitor),
            Index = gleam@dict:delete(erlang:element(3, State), Pid),
            Group = gleam@set:delete(erlang:element(4, State), Subject),
            Delete = fun(_, Subjects) -> gleam@set:delete(Subjects, Subject) end,
            Named = gleam@dict:map_values(erlang:element(5, State), Delete),
            erlang:setelement(
                5,
                erlang:setelement(4, erlang:setelement(3, State, Index), Group),
                Named
            );

        {error, nil} ->
            State
    end.

-spec get_group(
    gleam@dict:dict(HGM, gleam@set:set(gleam@erlang@process:subject(HGN))),
    HGM
) -> gleam@set:set(gleam@erlang@process:subject(HGN)).
get_group(Named, Name) ->
    case gleam@dict:get(Named, Name) of
        {ok, Subjects} ->
            Subjects;

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

-spec delete_named(state(HFZ, HGA), HFZ) -> state(HFZ, HGA).
delete_named(State, Name) ->
    Other_named = gleam@dict:delete(erlang:element(5, State), Name),
    Other_subjects = gleam@dict:fold(
        Other_named,
        gleam@set:new(),
        fun(All_subjects, _, Subjects) ->
            gleam@set:union(All_subjects, Subjects)
        end
    ),
    Subjects@1 = get_group(erlang:element(5, 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,
    Pids_to_delete = begin
        _pipe@2 = Subjects_to_delete,
        gleam@list:map(
            _pipe@2,
            fun(Subject) -> gleam@erlang@process:subject_owner(Subject) end
        )
    end,
    Monitors = begin
        _pipe@3 = erlang:element(3, State),
        _pipe@4 = gleam@dict:take(_pipe@3, Pids_to_delete),
        gleam@dict:values(_pipe@4)
    end,
    gleam@list:each(Monitors, fun gleam_erlang_ffi:demonitor/1),
    Index = gleam@dict:drop(erlang:element(3, State), Pids_to_delete),
    Group = gleam@set:drop(erlang:element(4, State), Subjects_to_delete),
    Named = gleam@dict:delete(erlang:element(5, State), Name),
    erlang:setelement(
        5,
        erlang:setelement(4, erlang:setelement(3, State, Index), Group),
        Named
    ).

-spec receive_process_down(
    gleam@erlang@process:selector(message(HHA, HHB)),
    gleam@erlang@process:process_monitor(),
    gleam@erlang@process:subject(HHB)
) -> gleam@erlang@process:selector(message(HHA, HHB)).
receive_process_down(Selector, Monitor, Subject) ->
    Handle = fun(_) -> {demonitor, Subject} end,
    gleam@erlang@process:selecting_process_down(Selector, Monitor, Handle).

-spec insert(state(HFL, HFM), gleam@erlang@process:subject(HFM)) -> state(HFL, HFM).
insert(State, Subject) ->
    Pid = gleam@erlang@process:subject_owner(Subject),
    case gleam@dict:get(erlang:element(3, State), Pid) of
        {ok, Monitor} ->
            Group = gleam@set:insert(erlang:element(4, State), Subject),
            Selector = receive_process_down(
                erlang:element(6, State),
                Monitor,
                Subject
            ),
            erlang:setelement(6, erlang:setelement(4, State, Group), Selector);

        {error, nil} ->
            Monitor@1 = gleam@erlang@process:monitor_process(Pid),
            Index = gleam@dict:insert(erlang:element(3, State), Pid, Monitor@1),
            Group@1 = gleam@set:insert(erlang:element(4, State), Subject),
            Selector@1 = receive_process_down(
                erlang:element(6, State),
                Monitor@1,
                Subject
            ),
            erlang:setelement(
                6,
                erlang:setelement(
                    4,
                    erlang:setelement(3, State, Index),
                    Group@1
                ),
                Selector@1
            )
    end.

-spec insert_as(state(HFS, HFT), gleam@erlang@process:subject(HFT), HFS) -> state(HFS, HFT).
insert_as(State, Subject, Name) ->
    Subjects = begin
        _pipe = erlang:element(5, State),
        _pipe@1 = get_group(_pipe, Name),
        gleam@set:insert(_pipe@1, Subject)
    end,
    Named = gleam@dict:insert(erlang:element(5, State), Name, Subjects),
    _pipe@2 = erlang:setelement(5, State, Named),
    insert(_pipe@2, Subject).

-spec rebuild_process_down_selectors(state(HGU, HGV)) -> state(HGU, HGV).
rebuild_process_down_selectors(State) ->
    Self = gleam@erlang@process:new_subject(),
    Subjects = gleam@set:to_list(erlang:element(4, State)),
    Selector@1 = begin
        _pipe = gleam_erlang_ffi:new_selector(),
        _pipe@1 = gleam@erlang@process:selecting(
            _pipe,
            Self,
            fun gleam@function:identity/1
        ),
        gleam@list:fold(
            Subjects,
            _pipe@1,
            fun(Selector, Subject) ->
                Pid = gleam@erlang@process:subject_owner(Subject),
                case gleam@dict:get(erlang:element(3, State), Pid) of
                    {ok, Monitor} ->
                        receive_process_down(Selector, Monitor, Subject);

                    {error, nil} ->
                        Selector
                end
            end
        )
    end,
    erlang:setelement(6, erlang:setelement(2, State, Self), Selector@1).

-spec handle_message(message(HFE, HFF), state(HFE, HFF)) -> gleam@otp@actor:next(message(HFE, HFF), state(HFE, HFF)).
handle_message(Message, State) ->
    case Message of
        {all, Client} ->
            Subjects = gleam@set:to_list(erlang:element(4, State)),
            gleam@erlang@process:send(Client, Subjects),
            gleam@otp@actor:continue(State);

        {named, Client@1} ->
            Indexed@1 = gleam@dict:fold(
                erlang:element(5, State),
                [],
                fun(Acc, Key, Subjects@1) ->
                    Indexed = begin
                        _pipe = Subjects@1,
                        _pipe@1 = gleam@set:to_list(_pipe),
                        gleam@list:map(
                            _pipe@1,
                            fun(Subject) -> {Key, Subject} end
                        )
                    end,
                    gleam@list:append(Indexed, Acc)
                end
            ),
            gleam@erlang@process:send(Client@1, Indexed@1),
            gleam@otp@actor:continue(State);

        {lookup, Client@2, Name} ->
            Subjects@2 = begin
                _pipe@2 = get_group(erlang:element(5, State), Name),
                gleam@set:to_list(_pipe@2)
            end,
            gleam@erlang@process:send(Client@2, Subjects@2),
            gleam@otp@actor:continue(State);

        {register, Subject@1} ->
            State@1 = insert(State, Subject@1),
            _pipe@3 = gleam@otp@actor:continue(State@1),
            gleam@otp@actor:with_selector(_pipe@3, erlang:element(6, State@1));

        {register_as, Subject@2, Name@1} ->
            State@2 = insert_as(State, Subject@2, Name@1),
            _pipe@4 = gleam@otp@actor:continue(State@2),
            gleam@otp@actor:with_selector(_pipe@4, erlang:element(6, State@2));

        {deregister, Name@2} ->
            State@3 = delete_named(State, Name@2),
            gleam@erlang@process:send(
                erlang:element(2, State@3),
                rebuild_selector
            ),
            gleam@otp@actor:continue(State@3);

        {demonitor, Subject@3} ->
            State@4 = demonitor_subject(State, Subject@3),
            gleam@erlang@process:send(
                erlang:element(2, State@4),
                rebuild_selector
            ),
            gleam@otp@actor:continue(State@4);

        rebuild_selector ->
            State@5 = rebuild_process_down_selectors(State),
            _pipe@5 = gleam@otp@actor:continue(State@5),
            gleam@otp@actor:with_selector(_pipe@5, erlang:element(6, State@5));

        {stop, Client@3} ->
            gleam@erlang@process:send(Client@3, normal),
            {stop, normal}
    end.

-spec start() -> {ok, gleam@erlang@process:subject(message(any(), any()))} |
    {error, gleam@otp@actor:start_error()}.
start() ->
    gleam@otp@actor:start_spec(
        {spec, fun handle_init/0, 10, fun handle_message/2}
    ).