/**
 * Admin/ops API (protected). Policies, key rotation, circuit-breaker.
 * Auth: ADMIN_API_KEY (x-admin-key or admin_key query) or JWT later.
 * Audit: sends to dbis_core central audit when DBIS_CENTRAL_URL + ADMIN_CENTRAL_API_KEY set.
 */

import { Router, Request, Response, NextFunction } from 'express';
import { setCircuitBreaker } from './observability.js';
import { appendCentralAudit } from './central-audit.js';

const router: Router = Router();
const ADMIN_API_KEY = process.env.ADMIN_API_KEY;

let policies: Record<string, unknown> = {};
let lastKeyRotationAt: Date | null = null;

function getAdminSubject(req: Request): string {
  return (req.headers['x-admin-subject'] as string) || 'multi-chain-execution';
}

function adminAuth(req: Request, res: Response, next: NextFunction): void {
  if (!ADMIN_API_KEY) {
    next();
    return;
  }
  const key = req.headers['x-admin-key'] ?? req.query.admin_key;
  if (key !== ADMIN_API_KEY) {
    res.status(401).json({ error: 'Unauthorized' });
    return;
  }
  next();
}

router.use(adminAuth);

router.post('/v1/admin/policies', (req: Request, res: Response) => {
  const body = req.body as Record<string, unknown>;
  if (body && typeof body === 'object') {
    policies = { ...policies, ...body };
  }
  appendCentralAudit({
    employeeId: getAdminSubject(req),
    action: 'update_policies',
    permission: 'admin:action',
    resourceType: 'policies',
    metadata: body,
    ipAddress: req.ip || (req.headers['x-forwarded-for'] as string)?.split(',')[0],
    userAgent: req.get('user-agent') ?? undefined,
  }).catch(() => {});
  res.status(200).json({ message: 'Policy update accepted', policies });
});

router.get('/v1/admin/policies', (_req: Request, res: Response) => {
  res.status(200).json({ policies });
});

router.post('/v1/admin/keys/rotate', (req: Request, res: Response) => {
  lastKeyRotationAt = new Date();
  appendCentralAudit({
    employeeId: getAdminSubject(req),
    action: 'keys_rotate',
    permission: 'admin:action',
    resourceType: 'keys',
    ipAddress: req.ip || (req.headers['x-forwarded-for'] as string)?.split(',')[0],
    userAgent: req.get('user-agent') ?? undefined,
  }).catch(() => {});
  res.status(200).json({
    message: 'Key rotation initiated',
    rotated_at: lastKeyRotationAt.toISOString(),
  });
});

router.get('/v1/admin/keys/status', (_req: Request, res: Response) => {
  res.status(200).json({
    last_rotation: lastKeyRotationAt?.toISOString() ?? null,
  });
});

router.post('/v1/admin/circuit-breaker/on', (req: Request, res: Response) => {
  setCircuitBreaker(true);
  appendCentralAudit({
    employeeId: getAdminSubject(req),
    action: 'circuit_breaker_on',
    permission: 'admin:action',
    resourceType: 'circuit_breaker',
    ipAddress: req.ip || (req.headers['x-forwarded-for'] as string)?.split(',')[0],
    userAgent: req.get('user-agent') ?? undefined,
  }).catch(() => {});
  res.status(200).json({ message: 'Circuit breaker forced open' });
});

router.post('/v1/admin/circuit-breaker/off', (req: Request, res: Response) => {
  setCircuitBreaker(false);
  appendCentralAudit({
    employeeId: getAdminSubject(req),
    action: 'circuit_breaker_off',
    permission: 'admin:action',
    resourceType: 'circuit_breaker',
    ipAddress: req.ip || (req.headers['x-forwarded-for'] as string)?.split(',')[0],
    userAgent: req.get('user-agent') ?? undefined,
  }).catch(() => {});
  res.status(200).json({ message: 'Circuit breaker forced closed' });
});

export default router;