defmodule PoexWeb.PadChannel do
  use Phoenix.Channel
  alias Poex.Pads.DocumentDynamicSupervisor
  alias Poex.Repo
  alias Poex.Pads.Document
  alias Poex.Pads.DocumentServer

  @moduledoc """
  Channel for users of pad documents
  """

  def join("pad:lobby", _message, socket) do
    {:ok, socket}
  end

  def join("pad:" <> document_id, _params, socket) do
    document = Repo.get!(Document, document_id)
    DocumentDynamicSupervisor.start_document_server(document)
    contents = DocumentServer.get_contents(document_id)

    {:ok, %{uuid: socket.assigns.uuid, contents: contents},
     assign(socket, :document_id, document_id)}
  end

  def handle_in("update", %{"change" => change, "client_id" => client_id}, socket) do
    DocumentServer.update(socket.assigns.document_id, %{
      "change" => change,
      "client_id" => client_id
    })

    {:noreply, socket}
  end
end