chat_client.ex

defmodule ChatClient do
  @server_name :chat_server

  def hello do
    IO.puts "hello world!!!"
  end

  def join_server server_id, cookie \\ :"cookiemonster" do
    Node.set_cookie(Node.self, cookie)
    pid = spawn(__MODULE__, :message_listener, [])
    Node.connect server_id
    :global.register_name(Node.self, pid)
  end

  def server_name do
    @server_name
  end

  def server do
    :global.whereis_name(server_name)
  end

  def friends do
    recipients = List.delete :global.registered_names, server_name
    List.delete recipients, Node.self
  end

  def broadcast message do
    send server, {:all, Node.self, message}
    :ok
  end

  def direct_message friend, message do
    send server, {:private_message, Node.self, friend, message}
    :ok
  end

  def message_listener do
    receive do
      {sender, message} ->
        IO.puts "#{sender}: #{message}"
        message_listener
    end
  end
end