defmodule Broker do
  use GenServer

  def start_link({:tcp, port, to_host, to_port}) do
    GenServer.start_link(__MODULE__, {:tcp, port, to_host, to_port})
  end

  @impl true
  def init({:tcp, port, to_host, to_port}) do
    {:ok, listen_socket} =
      :gen_tcp.listen(port, [
        :binary,
        reuseaddr: true,
        active: true,
        backlog: 100
      ])

    TcpWatcher.start_link({to_host, to_port, listen_socket})
    {:ok, {:tcp, port, to_host, to_port, listen_socket}}
  end
end