-module(telega@bot).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([set_webhook/1, wait_handler/2, start_registry/4]).
-export_type([registry/1, registry_message/0, session_settings/1, context/1, bot_instanse_message/1, bot_instanse/1, hears/0, handler/1, callback_query_filter/0]).

-type registry(UCC) :: {registry,
        gleam@dict:dict(binary(), gleam@erlang@process:subject(bot_instanse_message(UCC))),
        telega@internal@config:config(),
        session_settings(UCC),
        list(handler(UCC)),
        gleam@erlang@process:subject(registry_message()),
        gleam@erlang@process:subject(gleam@erlang@process:subject(bot_instanse_message(UCC)))}.

-type registry_message() :: {handle_bot_registry_message,
        telega@update:update()}.

-type session_settings(UCD) :: {session_settings,
        fun((binary(), UCD) -> {ok, UCD} | {error, binary()}),
        fun((binary()) -> {ok, UCD} | {error, binary()})}.

-type context(UCE) :: {context,
        binary(),
        telega@update:update(),
        telega@internal@config:config(),
        UCE,
        gleam@erlang@process:subject(bot_instanse_message(UCE))}.

-type bot_instanse_message(UCF) :: bot_instanse_message_ok |
    {bot_instanse_message_new,
        gleam@erlang@process:subject(bot_instanse_message(UCF)),
        telega@update:update()} |
    {bot_instanse_message_wait_handler, handler(UCF)}.

-type bot_instanse(UCG) :: {bot_instanse,
        binary(),
        UCG,
        telega@internal@config:config(),
        list(handler(UCG)),
        session_settings(UCG),
        gleam@option:option(handler(UCG)),
        gleam@erlang@process:subject(bot_instanse_message(UCG))}.

-type hears() :: {hear_text, binary()} |
    {hear_texts, list(binary())} |
    {hear_regex, gleam@regex:regex()} |
    {hear_regexes, list(gleam@regex:regex())}.

-type handler(UCH) :: {handle_all,
        fun((context(UCH)) -> {ok, UCH} | {error, binary()})} |
    {handle_command,
        binary(),
        fun((context(UCH), telega@update:command()) -> {ok, UCH} |
            {error, binary()})} |
    {handle_commands,
        list(binary()),
        fun((context(UCH), telega@update:command()) -> {ok, UCH} |
            {error, binary()})} |
    {handle_text,
        fun((context(UCH), binary()) -> {ok, UCH} | {error, binary()})} |
    {handle_hears,
        hears(),
        fun((context(UCH), binary()) -> {ok, UCH} | {error, binary()})} |
    {handle_callback_query,
        callback_query_filter(),
        fun((context(UCH), binary(), binary()) -> {ok, UCH} | {error, binary()})}.

-type callback_query_filter() :: {callback_query_filter, gleam@regex:regex()}.

-spec try_send_update(
    gleam@erlang@process:subject(bot_instanse_message(UCS)),
    telega@update:update()
) -> {ok, bot_instanse_message(UCS)} |
    {error, gleam@erlang@process:call_error(bot_instanse_message(UCS))}.
try_send_update(Registry_item, Update) ->
    gleam@erlang@process:try_call(
        Registry_item,
        fun(_capture) -> {bot_instanse_message_new, _capture, Update} end,
        1000
    ).

-spec set_webhook(telega@internal@config:config()) -> {ok, boolean()} |
    {error, binary()}.
set_webhook(Config) ->
    telega@api:set_webhook(
        erlang:element(5, Config),
        {set_webhook_parameters,
            <<<<(erlang:element(2, Config))/binary, "/"/utf8>>/binary,
                (erlang:element(3, Config))/binary>>,
            none,
            none,
            none,
            none,
            {some, erlang:element(4, Config)}}
    ).

-spec wait_handler(context(UDK), handler(UDK)) -> {ok, UDK} | {error, binary()}.
wait_handler(Ctx, Handler) ->
    gleam@erlang@process:send(
        erlang:element(6, Ctx),
        {bot_instanse_message_wait_handler, Handler}
    ),
    {ok, erlang:element(5, Ctx)}.

-spec new_context(bot_instanse(UDP), telega@update:update()) -> context(UDP).
new_context(Bot, Update) ->
    {context,
        erlang:element(2, Bot),
        Update,
        erlang:element(4, Bot),
        erlang:element(3, Bot),
        erlang:element(8, Bot)}.

-spec get_session_key(telega@update:update()) -> {ok, binary()} |
    {error, binary()}.
get_session_key(Update) ->
    case Update of
        {command_update, Chat_id, _, _} ->
            {ok, gleam@int:to_string(Chat_id)};

        {text_update, Chat_id@1, _, _} ->
            {ok, gleam@int:to_string(Chat_id@1)};

        {callback_query_update, From_id, _} ->
            {ok, gleam@int:to_string(From_id)};

        {unknown_update, _} ->
            {error,
                <<"Unknown update type don't allow to get session key"/utf8>>}
    end.

-spec get_session(session_settings(UDU), telega@update:update()) -> {ok, UDU} |
    {error, binary()}.
get_session(Session_settings, Update) ->
    gleam@result:'try'(
        get_session_key(Update),
        fun(Key) -> _pipe = (erlang:element(3, Session_settings))(Key),
            gleam@result:map_error(
                _pipe,
                fun(E) ->
                    <<"Failed to get session:\n "/utf8,
                        (gleam@string:inspect(E))/binary>>
                end
            ) end
    ).

-spec hears_check(binary(), hears()) -> boolean().
hears_check(Text, Hear) ->
    case Hear of
        {hear_text, Str} ->
            Text =:= Str;

        {hear_texts, Strs} ->
            gleam@list:contains(Strs, Text);

        {hear_regex, Re} ->
            gleam@regex:check(Re, Text);

        {hear_regexes, Regexes} ->
            gleam@list:any(
                Regexes,
                fun(_capture) -> gleam@regex:check(_capture, Text) end
            )
    end.

-spec do_handle(bot_instanse(UEI), telega@update:update(), handler(UEI)) -> gleam@option:option({ok,
        UEI} |
    {error, binary()}).
do_handle(Bot, Update, Handler) ->
    case {Handler, Update} of
        {{handle_all, Handle}, _} ->
            {some, Handle(new_context(Bot, Update))};

        {{handle_text, Handle@1}, {text_update, _, Text, _}} ->
            {some, Handle@1(new_context(Bot, Update), Text)};

        {{handle_hears, Hear, Handle@2}, {text_update, _, Text@1, _}} ->
            case hears_check(Text@1, Hear) of
                true ->
                    {some, Handle@2(new_context(Bot, Update), Text@1)};

                false ->
                    none
            end;

        {{handle_command, Command, Handle@3},
            {command_update, _, Update_command, _}} ->
            case erlang:element(3, Update_command) =:= Command of
                true ->
                    {some, Handle@3(new_context(Bot, Update), Update_command)};

                false ->
                    none
            end;

        {{handle_commands, Commands, Handle@4},
            {command_update, _, Update_command@1, _}} ->
            case gleam@list:contains(
                Commands,
                erlang:element(3, Update_command@1)
            ) of
                true ->
                    {some, Handle@4(new_context(Bot, Update), Update_command@1)};

                false ->
                    none
            end;

        {{handle_callback_query, Filter, Handle@5},
            {callback_query_update, _, Raw}} ->
            case erlang:element(7, Raw) of
                {some, Data} ->
                    case gleam@regex:check(erlang:element(2, Filter), Data) of
                        true ->
                            {some,
                                Handle@5(
                                    new_context(Bot, Update),
                                    Data,
                                    erlang:element(2, Raw)
                                )};

                        false ->
                            none
                    end;

                none ->
                    none
            end;

        {_, _} ->
            none
    end.

-spec loop_handlers(
    bot_instanse(UEO),
    telega@update:update(),
    list(handler(UEO))
) -> {ok, UEO} | {error, binary()}.
loop_handlers(Bot, Update, Handlers) ->
    case Handlers of
        [Handler | Rest] ->
            case do_handle(Bot, Update, Handler) of
                {some, {ok, New_session}} ->
                    loop_handlers(
                        erlang:setelement(3, Bot, New_session),
                        Update,
                        Rest
                    );

                {some, {error, E}} ->
                    {error,
                        <<<<<<"Failed to handle message "/utf8,
                                    (gleam@string:inspect(Update))/binary>>/binary,
                                ":\n"/utf8>>/binary,
                            E/binary>>};

                none ->
                    loop_handlers(Bot, Update, Rest)
            end;

        [] ->
            (erlang:element(2, erlang:element(6, Bot)))(
                erlang:element(2, Bot),
                erlang:element(3, Bot)
            )
    end.

-spec handle_bot_instanse_message(bot_instanse_message(UEE), bot_instanse(UEE)) -> gleam@otp@actor:next(any(), bot_instanse(UEE)).
handle_bot_instanse_message(Message, Bot) ->
    case Message of
        {bot_instanse_message_new, Client, Message@1} ->
            case erlang:element(7, Bot) of
                {some, Handler} ->
                    case do_handle(Bot, Message@1, Handler) of
                        {some, {ok, New_session}} ->
                            gleam@otp@actor:send(
                                Client,
                                bot_instanse_message_ok
                            ),
                            gleam@otp@actor:continue(
                                erlang:setelement(
                                    7,
                                    erlang:setelement(3, Bot, New_session),
                                    none
                                )
                            );

                        {some, {error, E}} ->
                            telega@log:error(
                                <<"Failed to handle update:\n"/utf8, E/binary>>
                            ),
                            {stop, normal};

                        none ->
                            gleam@otp@actor:send(
                                Client,
                                bot_instanse_message_ok
                            ),
                            gleam@otp@actor:continue(Bot)
                    end;

                none ->
                    case loop_handlers(Bot, Message@1, erlang:element(5, Bot)) of
                        {ok, New_session@1} ->
                            gleam@otp@actor:send(
                                Client,
                                bot_instanse_message_ok
                            ),
                            gleam@otp@actor:continue(
                                erlang:setelement(3, Bot, New_session@1)
                            );

                        {error, E@1} ->
                            telega@log:error(
                                <<"Failed to handle update:\n"/utf8,
                                    E@1/binary>>
                            ),
                            {stop, normal}
                    end
            end;

        {bot_instanse_message_wait_handler, Handler@1} ->
            gleam@otp@actor:continue(
                erlang:setelement(7, Bot, {some, Handler@1})
            );

        bot_instanse_message_ok ->
            gleam@otp@actor:continue(Bot)
    end.

-spec start_bot_instanse(
    registry(UDY),
    telega@update:update(),
    binary(),
    gleam@erlang@process:subject(gleam@erlang@process:subject(bot_instanse_message(UDY)))
) -> {ok, gleam@erlang@process:subject(bot_instanse_message(UDY))} |
    {error, gleam@otp@actor:start_error()}.
start_bot_instanse(Registry, Update, Session_key, Parent_subject) ->
    gleam@otp@actor:start_spec(
        {spec,
            fun() ->
                Actor_subj = gleam@erlang@process:new_subject(),
                gleam@erlang@process:send(Parent_subject, Actor_subj),
                Selector = begin
                    _pipe = gleam_erlang_ffi:new_selector(),
                    gleam@erlang@process:selecting(
                        _pipe,
                        Actor_subj,
                        fun gleam@function:identity/1
                    )
                end,
                case get_session(erlang:element(4, Registry), Update) of
                    {ok, Session} ->
                        _pipe@1 = {bot_instanse,
                            Session_key,
                            Session,
                            erlang:element(3, Registry),
                            erlang:element(5, Registry),
                            erlang:element(4, Registry),
                            none,
                            Actor_subj},
                        {ready, _pipe@1, Selector};

                    {error, E} ->
                        {failed,
                            <<"Failed to init bot instanse:\n"/utf8, E/binary>>}
                end
            end,
            10000,
            fun handle_bot_instanse_message/2}
    ).

-spec add_bot_instance(registry(UCY), binary(), telega@update:update()) -> gleam@otp@actor:next(any(), registry(UCY)).
add_bot_instance(Registry, Session_key, Update) ->
    Registry_actor = gleam@otp@supervisor:supervisor(
        fun(_) ->
            start_bot_instanse(
                Registry,
                Update,
                Session_key,
                erlang:element(7, Registry)
            )
        end
    ),
    _assert_subject = gleam@otp@supervisor:start(
        fun(_capture) -> gleam@otp@supervisor:add(_capture, Registry_actor) end
    ),
    {ok, _} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"telega/bot"/utf8>>,
                        function => <<"add_bot_instance"/utf8>>,
                        line => 96})
    end,
    Bot_subject_result = begin
        _pipe = gleam@erlang@process:'receive'(
            erlang:element(7, Registry),
            1000
        ),
        gleam@result:map_error(
            _pipe,
            fun(E) ->
                <<"Failed to start bot instanse:\n"/utf8,
                    (gleam@string:inspect(E))/binary>>
            end
        )
    end,
    case Bot_subject_result of
        {ok, Bot_subject} ->
            case try_send_update(Bot_subject, Update) of
                {ok, _} ->
                    gleam@otp@actor:continue(
                        erlang:setelement(
                            2,
                            Registry,
                            gleam@dict:insert(
                                erlang:element(2, Registry),
                                Session_key,
                                Bot_subject
                            )
                        )
                    );

                {error, E@1} ->
                    telega@log:error(
                        <<"Failed to send message to bot instanse: "/utf8,
                            (gleam@string:inspect(E@1))/binary>>
                    ),
                    gleam@otp@actor:continue(Registry)
            end;

        {error, E@2} ->
            telega@log:error(E@2),
            gleam@otp@actor:continue(Registry)
    end.

-spec handle_registry_message(registry_message(), registry(UCV)) -> gleam@otp@actor:next(any(), registry(UCV)).
handle_registry_message(Message, Registry) ->
    case Message of
        {handle_bot_registry_message, Message@1} ->
            case get_session_key(Message@1) of
                {ok, Session_key} ->
                    case gleam@dict:get(
                        erlang:element(2, Registry),
                        Session_key
                    ) of
                        {ok, Registry_item} ->
                            case try_send_update(Registry_item, Message@1) of
                                {ok, _} ->
                                    gleam@otp@actor:continue(Registry);

                                {error, _} ->
                                    add_bot_instance(
                                        Registry,
                                        Session_key,
                                        Message@1
                                    )
                            end;

                        {error, nil} ->
                            add_bot_instance(Registry, Session_key, Message@1)
                    end;

                {error, E} ->
                    telega@log:error(
                        <<"Failed to get session key: "/utf8,
                            (gleam@string:inspect(E))/binary>>
                    ),
                    gleam@otp@actor:continue(Registry)
            end
    end.

-spec start_registry(
    telega@internal@config:config(),
    list(handler(UDD)),
    session_settings(UDD),
    gleam@erlang@process:subject(gleam@erlang@process:subject(registry_message()))
) -> {ok, gleam@erlang@process:subject(registry_message())} |
    {error, gleam@otp@actor:start_error()}.
start_registry(Config, Handlers, Session_settings, Root_subject) ->
    gleam@otp@actor:start_spec(
        {spec,
            fun() ->
                Registry_subject = gleam@erlang@process:new_subject(),
                Bot_instances_subject = gleam@erlang@process:new_subject(),
                gleam@erlang@process:send(Root_subject, Registry_subject),
                Selector = begin
                    _pipe = gleam_erlang_ffi:new_selector(),
                    gleam@erlang@process:selecting(
                        _pipe,
                        Registry_subject,
                        fun gleam@function:identity/1
                    )
                end,
                _pipe@1 = {registry,
                    gleam@dict:new(),
                    Config,
                    Session_settings,
                    Handlers,
                    Registry_subject,
                    Bot_instances_subject},
                {ready, _pipe@1, Selector}
            end,
            10000,
            fun handle_registry_message/2}
    ).