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

-export([application/3, element/1, simple/3, component/4, start_actor/2, start_server_component/2, register/2, dispatch/1, shutdown/0, is_browser/0, start/3, is_registered/1]).
-export_type([app/3, client_spa/0, server_component/0, error/0]).

-opaque app(PNP, PNQ, PNR) :: {app,
        fun((PNP) -> {PNQ, lustre@effect:effect(PNR)}),
        fun((PNQ, PNR) -> {PNQ, lustre@effect:effect(PNR)}),
        fun((PNQ) -> lustre@internals@vdom:element(PNR)),
        gleam@option:option(gleam@dict:dict(binary(), fun((gleam@dynamic:dynamic_()) -> {ok,
                PNR} |
            {error, list(gleam@dynamic:decode_error())})))}.

-type client_spa() :: any().

-type server_component() :: any().

-type error() :: {actor_error, gleam@otp@actor:start_error()} |
    {bad_component_name, binary()} |
    {component_already_registered, binary()} |
    {element_not_found, binary()} |
    not_a_browser |
    not_erlang.

-spec application(
    fun((POK) -> {POL, lustre@effect:effect(POM)}),
    fun((POL, POM) -> {POL, lustre@effect:effect(POM)}),
    fun((POL) -> lustre@internals@vdom:element(POM))
) -> app(POK, POL, POM).
application(Init, Update, View) ->
    {app, Init, Update, View, none}.

-spec element(lustre@internals@vdom:element(PNY)) -> app(nil, nil, PNY).
element(Html) ->
    Init = fun(_) -> {nil, lustre@effect:none()} end,
    Update = fun(_, _) -> {nil, lustre@effect:none()} end,
    View = fun(_) -> Html end,
    application(Init, Update, View).

-spec simple(
    fun((POD) -> POE),
    fun((POE, POF) -> POE),
    fun((POE) -> lustre@internals@vdom:element(POF))
) -> app(POD, POE, POF).
simple(Init, Update, View) ->
    Init@1 = fun(Flags) -> {Init(Flags), lustre@effect:none()} end,
    Update@1 = fun(Model, Msg) -> {Update(Model, Msg), lustre@effect:none()} end,
    application(Init@1, Update@1, View).

-spec component(
    fun((POT) -> {POU, lustre@effect:effect(POV)}),
    fun((POU, POV) -> {POU, lustre@effect:effect(POV)}),
    fun((POU) -> lustre@internals@vdom:element(POV)),
    gleam@dict:dict(binary(), fun((gleam@dynamic:dynamic_()) -> {ok, POV} |
        {error, list(gleam@dynamic:decode_error())}))
) -> app(POT, POU, POV).
component(Init, Update, View, On_attribute_change) ->
    {app, Init, Update, View, {some, On_attribute_change}}.

-spec do_start(app(PPP, any(), PPR), binary(), PPP) -> {ok,
        fun((lustre@internals@runtime:action(PPR, client_spa())) -> nil)} |
    {error, error()}.
do_start(_, _, _) ->
    {error, not_a_browser}.

-spec do_start_actor(app(PQU, any(), PQW), PQU) -> {ok,
        gleam@erlang@process:subject(lustre@internals@runtime:action(PQW, server_component()))} |
    {error, error()}.
do_start_actor(App, Flags) ->
    On_attribute_change = gleam@option:unwrap(
        erlang:element(5, App),
        gleam@dict:new()
    ),
    _pipe = (erlang:element(2, App))(Flags),
    _pipe@1 = lustre@internals@runtime:start(
        _pipe,
        erlang:element(3, App),
        erlang:element(4, App),
        On_attribute_change
    ),
    gleam@result:map_error(_pipe@1, fun(Field@0) -> {actor_error, Field@0} end).

-spec start_actor(app(PQJ, any(), PQL), PQJ) -> {ok,
        gleam@erlang@process:subject(lustre@internals@runtime:action(PQL, server_component()))} |
    {error, error()}.
start_actor(App, Flags) ->
    do_start_actor(App, Flags).

-spec start_server_component(app(PPZ, any(), PQB), PPZ) -> {ok,
        fun((lustre@internals@runtime:action(PQB, server_component())) -> nil)} |
    {error, error()}.
start_server_component(App, Flags) ->
    gleam@result:map(
        start_actor(App, Flags),
        fun(Runtime) ->
            fun(_capture) -> gleam@otp@actor:send(Runtime, _capture) end
        end
    ).

-spec register(app(nil, any(), any()), binary()) -> {ok, nil} | {error, error()}.
register(_, _) ->
    {error, not_a_browser}.

-spec dispatch(PRM) -> lustre@internals@runtime:action(PRM, any()).
dispatch(Msg) ->
    {dispatch, Msg}.

-spec shutdown() -> lustre@internals@runtime:action(any(), any()).
shutdown() ->
    shutdown.

-spec is_browser() -> boolean().
is_browser() ->
    false.

-spec start(app(PPF, any(), PPH), binary(), PPF) -> {ok,
        fun((lustre@internals@runtime:action(PPH, client_spa())) -> nil)} |
    {error, error()}.
start(App, Selector, Flags) ->
    gleam@bool:guard(
        not is_browser(),
        {error, not_a_browser},
        fun() -> do_start(App, Selector, Flags) end
    ).

-spec is_registered(binary()) -> boolean().
is_registered(_) ->
    false.