defmodule MessageServer.Application do
  use Application
  require Logger

  @impl true
  def start(_type, _args) do
    server_id = get_server_id()

    children = [
      {MessageServer.Storage, server_id}
    ]

    opts = [strategy: :one_for_one, name: MessageServer.Supervisor]
    Supervisor.start_link(children, opts)
  end

  @spec get_server_id() :: String.t()
  def get_server_id() do
    System.get_env("SERVER_ID") ||
      raise "SERVER_ID is required"
  end
end