defmodule SendGridSender do
  use GenServer

  def start_link do
    GenServer.start_link(__MODULE__, %{}, name: SendGridSender)
  end

  def init(state) do
    {:ok, state}
  end

  def handle_cast({:send_mail, user_id, email_to, template_id, subject, attrs}, state) do
    {:ok, _body, headers} = Mailer.send(template_id, subject, attrs, email_to, Mix.env())

    {"X-Message-Id", smtp_id} =
      headers
      |> Enum.filter(fn {key, _} ->
        "X-Message-Id" == key
      end)
      |> List.first()

    # %{
    #   user_id: user_id,
    #   email_to: email_to,
    #   subject: subject,
    #   template_id: template_id,
    #   smpt_id: smtp_id
    # }

    {:noreply, state}
  end
end