// Mounted at /network-topology. Network Topology ships as a first-party
// in-process plugin (plugins/network-topology) rather than a route file
// imported directly here, so this module exists to keep /network-topology/*
// working at its original path without handing the plugin a reference to the
// shared app instance. The plugin runtime registers its router via
// registerNetworkTopologyRouter when it activates, and clears it on
// deactivate, so a disabled plugin falls back to the 404 below.
//
// Unlike /plugin-api, this dispatcher applies no auth of its own: it forwards
// to exactly one first-party router (the Network Topology plugin's own), and
// every route in that router already applies authenticateJWT itself, the same
// as every other router mounted alongside it here (/users, /host, /snippets,
// ...). /plugin-api gates at the mount point because it forwards to arbitrary
// third-party plugin code that cannot be assumed to gate itself; that
// reasoning does not apply to a single first-party router that already does.

import type { Request, Response, NextFunction, Router } from "express";
import { databaseLogger } from "../../utils/logger.js";

let activeRouter: Router | null = null;

export function registerNetworkTopologyRouter(router: Router): void {
  activeRouter = router;
  databaseLogger.info("Registered Network Topology plugin router", {
    operation: "network_topology_dispatch_register",
  });
}

export function unregisterNetworkTopologyRouter(): void {
  if (!activeRouter) return;
  activeRouter = null;
  databaseLogger.info("Unregistered Network Topology plugin router", {
    operation: "network_topology_dispatch_register",
  });
}

export default function networkTopologyDispatch(
  req: Request,
  res: Response,
  next: NextFunction,
): void {
  if (!activeRouter) {
    res.status(404).json({ error: "Network Topology is not available" });
    return;
  }
  activeRouter(req, res, next);
}