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

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

  router.get('/', async (req, res) => {
    try {
      const sessionId = req.header('x-session-id');
      if (!sessionId) {
        return res.status(400).json({ error: 'Missing x-session-id header' });
      }

      let token: string;
      try {
        token = await auth.acquireTokenBySessionId(sessionId);
      } catch (err: any) {
        const status = err.message.includes('expired') || err.message.includes('not found') ? 401 : 500;
        return res.status(status).json({
          error: 'authentication_required',
          message: err.message,
          hint: err.message.includes('expired')
            ? 'Device code has expired. Please call POST /login again.'
            : 'Please call POST /login first to authenticate',
        });
      }

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

  return router;
};