-module(lustre_http).
-compile([no_auto_import, nowarn_unused_vars]).

-export([get_as_text/2, get_as_json/3, post_text/3]).
-export_type([http_error/0, http_or_json_error/0]).

-type http_error() :: unauthorized |
    not_found |
    {internal_server_error, binary()} |
    {other_error, integer(), binary()}.

-type http_or_json_error() :: {h, http_error()} | {j, gleam@json:decode_error()}.

-spec decode_error(integer(), binary()) -> http_error().
decode_error(Code, Msg) ->
    case Code of
        401 ->
            unauthorized;

        404 ->
            not_found;

        500 ->
            {internal_server_error, Msg};

        _ ->
            {other_error, Code, Msg}
    end.

-spec do_get(
    binary(),
    fun((binary()) -> nil),
    fun((integer(), binary()) -> nil)
) -> nil.
do_get(Url, On_success, On_error) ->
    '.@ffi.mjs':do_request(
        <<"GET"/utf8>>,
        Url,
        <<""/utf8>>,
        On_success,
        On_error
    ).

-spec do_post(
    binary(),
    binary(),
    fun((binary()) -> nil),
    fun((integer(), binary()) -> nil)
) -> nil.
do_post(Url, Body, On_success, On_error) ->
    '.@ffi.mjs':do_request(<<"POST"/utf8>>, Url, Body, On_success, On_error).

-spec get_as_text(
    binary(),
    fun(({ok, binary()} | {error, http_error()}) -> GRZ)
) -> lustre@cmd:cmd(GRZ).
get_as_text(Url, To_msg) ->
    lustre@cmd:from(
        fun(Dispatch) ->
            do_get(
                Url,
                fun(Body) -> Dispatch(To_msg({ok, Body})) end,
                fun(Code, Msg) ->
                    _pipe = decode_error(Code, Msg),
                    _pipe@1 = {error, _pipe},
                    _pipe@2 = To_msg(_pipe@1),
                    Dispatch(_pipe@2)
                end
            )
        end
    ).

-spec get_as_json(
    binary(),
    fun(({ok, binary()} | {error, http_or_json_error()}) -> GSF),
    fun((gleam@dynamic:dynamic()) -> {ok, binary()} |
        {error, list(gleam@dynamic:decode_error())})
) -> lustre@cmd:cmd(GSF).
get_as_json(Url, To_msg, Decoder) ->
    lustre@cmd:from(
        fun(Dispatch) ->
            do_get(Url, fun(Body) -> case gleam@json:decode(Body, Decoder) of
                        {ok, Json} ->
                            Dispatch(To_msg({ok, Json}));

                        {error, Json_error} ->
                            Dispatch(To_msg({error, {j, Json_error}}))
                    end end, fun(Code, Msg) ->
                    Http_error = case Code of
                        401 ->
                            unauthorized;

                        404 ->
                            not_found;

                        500 ->
                            {internal_server_error, Msg};

                        _ ->
                            {other_error, Code, Msg}
                    end,
                    Dispatch(To_msg({error, {h, Http_error}}))
                end)
        end
    ).

-spec post_text(
    binary(),
    binary(),
    fun(({ok, binary()} | {error, http_error()}) -> GSI)
) -> lustre@cmd:cmd(GSI).
post_text(Url, Body, To_msg) ->
    lustre@cmd:from(
        fun(Dispatch) ->
            do_post(
                Url,
                Body,
                fun(Body@1) -> Dispatch(To_msg({ok, Body@1})) end,
                fun(Code, Msg) ->
                    _pipe = decode_error(Code, Msg),
                    _pipe@1 = {error, _pipe},
                    _pipe@2 = To_msg(_pipe@1),
                    Dispatch(_pipe@2)
                end
            )
        end
    ).