-module(openfeature@api).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([set_provider/1, get_provider_metadata/0, set_context/1, set_domain_provider/2, get_domain_provider_metadata/1, get_domain_client/1, get_client/0]).
-export_type([api/0]).

-type api() :: {api,
        openfeature@provider:feature_provider(),
        openfeature@evaluation_context:evaluation_context()}.

-spec default_api() -> api().
default_api() ->
    {api,
        openfeature@providers@no_op:provider(),
        {evaluation_context, none, gleam@dict:new()}}.

-spec set_provider(openfeature@provider:feature_provider()) -> {ok, nil} |
    {error, nil}.
set_provider(Provider) ->
    Api = persistent_term:get(<<"openfeature_api"/utf8>>, default_api()),
    New_api = {api, Provider, erlang:element(3, Api)},
    persistent_term:put(<<"openfeature_api"/utf8>>, New_api),
    (erlang:element(2, Provider))(erlang:element(3, Api)).

-spec get_provider() -> openfeature@provider:feature_provider().
get_provider() ->
    erlang:element(
        2,
        persistent_term:get(<<"openfeature_api"/utf8>>, default_api())
    ).

-spec get_provider_metadata() -> openfeature@provider:metadata().
get_provider_metadata() ->
    (erlang:element(
        4,
        erlang:element(
            2,
            persistent_term:get(<<"openfeature_api"/utf8>>, default_api())
        )
    ))().

-spec set_context(openfeature@evaluation_context:evaluation_context()) -> nil.
set_context(Context) ->
    Api = persistent_term:get(<<"openfeature_api"/utf8>>, default_api()),
    New_api = {api, erlang:element(2, Api), Context},
    persistent_term:put(<<"openfeature_api"/utf8>>, New_api).

-spec set_domain_provider(binary(), openfeature@provider:feature_provider()) -> nil.
set_domain_provider(Domain, Provider) ->
    persistent_term:put(<<"domain_provider__"/utf8, Domain/binary>>, Provider).

-spec get_domain_provider(binary()) -> openfeature@provider:feature_provider().
get_domain_provider(Domain) ->
    persistent_term:get(
        <<"domain_provider__"/utf8, Domain/binary>>,
        get_provider()
    ).

-spec get_domain_provider_metadata(binary()) -> openfeature@provider:metadata().
get_domain_provider_metadata(Domain) ->
    (erlang:element(
        4,
        persistent_term:get(
            <<"domain_provider__"/utf8, Domain/binary>>,
            get_provider()
        )
    ))().

-spec get_domain_client(binary()) -> openfeature@client:client().
get_domain_client(Domain) ->
    {client, get_domain_provider(Domain), {client_metadata, Domain}}.

-spec get_client() -> openfeature@client:client().
get_client() ->
    {client, get_provider(), {client_metadata, <<""/utf8>>}}.