import { Router } from 'express';
import { fetchGraph } from '../utils/index.ts';
import { acquireAppToken } from '../helper/msal.ts';
import { AuthManager } from '../auth/index.ts';

export default (auth?: AuthManager) => {
  const router = Router();

  router.get('/', async (req, res) => {
    try {
      // Authentication handled via client credentials (resolveCredential + createMsalClient)

      let token: string;
      try {
        token = await acquireAppToken(req, auth);
      } catch (err: any) {
        return res.status(401).json({ error: 'Failed to acquire access token', message: err?.message ?? String(err) });
      }

      const data = await fetchGraph('/me/events', token);
      res.json(data);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  return router;
};