# Run with `mix run --no-halt demo-engine.exs` from the pinned library.
# This loopback-only bridge is for a local pg_mcp installation. Never expose port 4040.
token_file = System.fetch_env!("DEMO_TOKEN_FILE")
token = token_file |> File.read!() |> Jason.decode!()
issuer = token["issuer"] || "https://mcp.elixirmcp.dev"
if token["resource"] != issuer <> "/mcp", do: raise("Use an OAuth token for the /mcp resource")
System.put_env("DEMO_ACCESS_TOKEN", Map.fetch!(token, "access_token"))
Application.put_env(:noizu_mcp, :allow_insecure_transports, true)

{:ok, _} =
  Supervisor.start_link(
    [
      Noizu.MCP.Engine,
      {Bandit,
       plug:
         {Noizu.MCP.Transport.StreamableHTTP.Plug, server: Noizu.MCP.Engine, origins: :localhost},
       ip: {127, 0, 0, 1},
       port: 4040}
    ],
    strategy: :one_for_one
  )

{:ok, _} =
  Noizu.MCP.Engine.Servers.insert(
    [
      %{
        "name" => "demo",
        "transport" => "http",
        "url" => issuer <> "/mcp",
        "auth_ref" => "env:DEMO_ACCESS_TOKEN",
        "enabled" => true
      }
    ],
    nil
  )

IO.puts("Demo engine listening on 127.0.0.1:4040. Restart after refreshing the upstream token.")
Process.sleep(:infinity)