defmodule Chatx do
  @moduledoc """
  Public API for the BEAM-native chat engine.

  Add `use Chatx` in your own module for ergonomic delegation.
  """

  defmacro __using__(_opts) do
    quote do
      def join(room_id, user_id), do: Chatx.join(room_id, user_id)
      def leave(room_id, user_id), do: Chatx.leave(room_id, user_id)

      def send_message(room_id, user_id, content),
        do: Chatx.send_message(room_id, user_id, content)

      def subscribe(room_id), do: Chatx.subscribe(room_id)
    end
  end

  @spec join(term(), term()) :: :ok | {:error, term()}
  def join(room_id, user_id) do
    :chatx_room.join(room_id, user_id, self())
  end

  @spec leave(term(), term()) :: :ok
  def leave(room_id, user_id) do
    :chatx_room.leave(room_id, user_id)
  end

  @spec subscribe(term()) :: :ok | {:error, term()}
  def subscribe(room_id) do
    :chatx_room.subscribe(room_id, self())
  end

  @spec send_message(term(), term(), iodata()) :: :ok | {:error, term()}
  def send_message(room_id, user_id, content) do
    :chatx_room.send_message(room_id, user_id, content)
  end
end