defmodule DexiWeb.SessionIdPlug do
  @moduledoc false

  import Plug.Conn

  @session_id_bytes 24

  def init(opts), do: opts

  def call(conn, _opts) do
    case get_session(conn, :session_id) do
      nil ->
        session_id =
          @session_id_bytes
          |> :crypto.strong_rand_bytes()
          |> Base.url_encode64(padding: false)

        conn
        |> put_session(:session_id, session_id)
        |> assign(:session_id, session_id)

      session_id ->
        assign(conn, :session_id, session_id)
    end
  end
end