defmodule TmsCore do
  @moduledoc """
  TmsCore - Terminal Management System Core

  This OTP application contains the core terminal management domain logic.
  It can be enabled/disabled via config:

      config :tms_core, :enabled, true   # default: true

  ## Public API

  - `TmsCore.Terminal` - CRUD and query operations for terminals

  ## PubSub

  Terminal domain events are broadcast on the shared PubSub under the
  `"device_updates"` topic.  To subscribe from another app:

      TmsCore.subscribe_to_device_updates()

  The PubSub server name is configured via:

      config :tms_core, :pubsub_server, DaProductApp.PubSub
  """

  @doc "Subscribe to device/terminal update events."
  def subscribe_to_device_updates do
    pubsub = Application.get_env(:tms_core, :pubsub_server, DaProductApp.PubSub)
    Phoenix.PubSub.subscribe(pubsub, "device_updates")
  end

  @doc "Unsubscribe from device/terminal update events."
  def unsubscribe_from_device_updates do
    pubsub = Application.get_env(:tms_core, :pubsub_server, DaProductApp.PubSub)
    Phoenix.PubSub.unsubscribe(pubsub, "device_updates")
  end
end