-module(og_image).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/og_image.gleam").
-export([defaults/0, render/2]).
-export_type([format/0, font_style/0, font/0, render_error/0, config/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-type format() :: png | {jpeg, integer()} | {web_p, integer()}.

-type font_style() :: normal | italic.

-type font() :: {font, binary(), binary(), integer(), font_style()}.

-type render_error() :: {invalid_element, binary()} |
    {font_load_error, binary()} |
    {image_load_error, binary()} |
    {render_failed, binary()}.

-type config() :: {config, integer(), integer(), format(), list(font())}.

-file("src/og_image.gleam", 48).
?DOC(" Default config: 1200x630 PNG, no custom fonts\n").
-spec defaults() -> config().
defaults() ->
    {config, 1200, 630, png, []}.

-file("src/og_image.gleam", 58).
?DOC(" Render a Lustre element to an image (Erlang target)\n").
-spec render(lustre@vdom@vnode:element(any()), config()) -> {ok, bitstring()} |
    {error, render_error()}.
render(El, Config) ->
    Urls = og_image@transform:collect_image_urls(El),
    Resources = og_image@fetch:fetch_all(Urls),
    Json_str = begin
        _pipe = El,
        _pipe@1 = og_image@transform:to_takumi_json_with_root(_pipe),
        gleam@json:to_string(_pipe@1)
    end,
    {Format_str, Quality} = case erlang:element(4, Config) of
        png ->
            {<<"png"/utf8>>, -1};

        {jpeg, Q} ->
            {<<"jpeg"/utf8>>, Q};

        {web_p, Q@1} ->
            {<<"webp"/utf8>>, Q@1}
    end,
    _pipe@2 = og_image_native:render_image(
        Json_str,
        erlang:element(2, Config),
        erlang:element(3, Config),
        Format_str,
        Quality,
        Resources
    ),
    gleam@result:map_error(
        _pipe@2,
        fun(Field@0) -> {render_failed, Field@0} end
    ).