sprocket

-module(sprocket@hooks).
-compile([no_auto_import, nowarn_unused_vars]).

-export([dep/1, compare_deps/2]).
-export_type([hook_trigger/0, effect_result/0, callback_result/0, hook/0, compared/1]).

-type hook_trigger() :: on_mount |
    on_update |
    {with_deps, list(gleam@dynamic:dynamic())}.

-type effect_result() :: {effect_result,
        gleam@option:option(fun(() -> nil)),
        gleam@option:option(list(gleam@dynamic:dynamic()))}.

-type callback_result() :: {callback_result,
        sprocket@internal@identifiable_callback:callback_fn(),
        gleam@option:option(list(gleam@dynamic:dynamic()))}.

-type hook() :: {callback,
        sprocket@internal@utils@unique:unique(),
        sprocket@internal@identifiable_callback:callback_fn(),
        hook_trigger(),
        gleam@option:option(callback_result())} |
    {effect,
        sprocket@internal@utils@unique:unique(),
        fun(() -> gleam@option:option(fun(() -> nil))),
        hook_trigger(),
        gleam@option:option(effect_result())} |
    {reducer,
        sprocket@internal@utils@unique:unique(),
        gleam@dynamic:dynamic(),
        fun(() -> nil)}.

-type compared(JJB) :: {changed, JJB} | unchanged.

-spec dep(any()) -> gleam@dynamic:dynamic().
dep(Dependency) ->
    gleam@dynamic:from(Dependency).

-spec compare_deps(list(gleam@dynamic:dynamic()), list(gleam@dynamic:dynamic())) -> compared(list(gleam@dynamic:dynamic())).
compare_deps(Prev_deps, Deps) ->
    case gleam@list:strict_zip(Prev_deps, Deps) of
        {error, length_mismatch} ->
            sprocket@internal@exception:throw_on_unexpected_deps_mismatch(
                {<<"compare_deps"/utf8>>, Prev_deps, Deps}
            );

        {ok, Zipped_deps} ->
            case gleam@list:all(
                Zipped_deps,
                fun(Z) ->
                    {A, B} = Z,
                    A =:= B
                end
            ) of
                true ->
                    unchanged;

                _ ->
                    {changed, Deps}
            end
    end.