-module(gwr@execution@instance).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([create/1, call/3]).
-export_type([web_assembly_instance/0]).

-type web_assembly_instance() :: {web_assembly_instance,
        gwr@binary:binary_(),
        gwr@execution@machine:machine()}.

-spec create(bitstring()) -> {ok, web_assembly_instance()} | {error, binary()}.
create(Data) ->
    gleam@result:'try'(
        gwr@parser@binary_parser:parse_binary_module(
            gwr@parser@binary_reader:create(Data)
        ),
        fun(_use0) ->
            {_, Binary} = _use0,
            gleam@result:'try'(
                gwr@execution@machine:initialize(erlang:element(4, Binary)),
                fun(Machine) ->
                    {ok, {web_assembly_instance, Binary, Machine}}
                end
            )
        end
    ).

-spec call(
    web_assembly_instance(),
    binary(),
    list(gwr@execution@runtime:value())
) -> {ok, {web_assembly_instance(), list(gwr@execution@runtime:value())}} |
    {error, binary()}.
call(Instance, Name, Arguments) ->
    gleam@result:'try'(
        case gleam@list:find(
            erlang:element(11, erlang:element(4, erlang:element(2, Instance))),
            fun(Export) ->
                case {erlang:element(2, Export) =:= Name,
                    erlang:element(3, Export)} of
                    {true, {function_export, _}} ->
                        true;

                    {_, _} ->
                        false
                end
            end
        ) of
            {ok, {export, _, {function_export, Index}}} ->
                {ok, Index};

            _ ->
                {error,
                    <<<<"gwr/execution/instance.call: couldn't find an exported function with name \""/utf8,
                            Name/binary>>/binary,
                        "\" in the given module"/utf8>>}
        end,
        fun(Function_index) ->
            gleam@result:'try'(
                gwr@execution@machine:call(
                    erlang:element(3, erlang:element(3, Instance)),
                    Function_index,
                    Arguments
                ),
                fun(_use0) ->
                    {New_state, Results} = _use0,
                    {ok,
                        {erlang:setelement(
                                3,
                                Instance,
                                erlang:setelement(
                                    3,
                                    erlang:element(3, Instance),
                                    New_state
                                )
                            ),
                            Results}}
                end
            )
        end
    ).