defmodule NullaWeb.WebfingerController do
  use NullaWeb, :controller
  alias Nulla.ActivityPub
  alias Nulla.Models.Actor
  alias Nulla.Models.InstanceSettings

  def index(conn, %{"resource" => resource}) do
    case Regex.run(~r/^acct:(.+)@(.+)$/, resource) do
      [_, username, domain] ->
        case Actor.get_actor(preferredUsername: username, domain: domain) do
          nil ->
            conn
            |> put_resp_content_type("text/plain")
            |> send_resp(404, "")

          %Actor{} = actor ->
            instance_settings = InstanceSettings.get_instance_settings!()

            if domain == instance_settings.domain do
              json(conn, ActivityPub.webfinger(actor))
            else
              conn
              |> put_resp_content_type("text/plain")
              |> send_resp(404, "")
            end
        end

      _ ->
        conn
        |> put_resp_content_type("text/plain")
        |> send_resp(400, "")
    end
  end

  def index(conn, _params) do
    conn
    |> put_resp_content_type("text/plain")
    |> send_resp(400, "")
  end
end