defmodule Aprsme.Cluster.PacketDistributor do
  @moduledoc """
  Distributes APRS packets from the leader node to all cluster members.
  This ensures all nodes can serve real-time updates via LiveView while
  only the leader maintains the APRS-IS connection.
  """
  alias Aprsme.Cluster.LeaderElection

  @pubsub_topic "cluster:packets"

  def distribute_packet(packet) do
    # Only distribute if clustering is enabled and we're the leader
    cluster_enabled = Application.get_env(:aprsme, :cluster_enabled, false)

    if cluster_enabled and LeaderElection.leader_cached?() do
      # Broadcast to all nodes including self
      Phoenix.PubSub.broadcast(
        Aprsme.PubSub,
        @pubsub_topic,
        {:distributed_packet, packet}
      )
    end
  end

  def subscribe do
    Phoenix.PubSub.subscribe(Aprsme.PubSub, @pubsub_topic)
  end

  def handle_distributed_packet({:distributed_packet, packet}) do
    # Broadcast to local LiveView clients via both PubSub systems
    Aprsme.StreamingPacketsPubSub.broadcast_packet(packet)
    Aprsme.SpatialPubSub.broadcast_packet(packet)

    :ok
  end
end