defmodule McpProxy do
  @moduledoc false
  require Logger

  alias McpProxy.SSE

  @doc false
  def main(args) do
    {opts, args} =
      OptionParser.parse!(args, strict: [debug: :boolean, max_disconnected_time: :integer])

    base_url =
      case args do
        [arg_url] ->
          arg_url

        [] ->
          System.get_env("SSE_URL") ||
            raise "either the URL is passed as first argument or the SSE_URL environment variable must be set"

        many ->
          raise "expected one or zero arguments, got: #{inspect(many)}"
      end

    Application.ensure_all_started(:req)

    {:ok, handler} = SSE.start_link({base_url, opts})
    ref = Process.monitor(handler)

    receive do
      {:DOWN, ^ref, _, _, reason} ->
        System.stop((reason == :normal && 0) || 1)
    end
  end
end