import { Router, Request, Response } from 'express';
import { EventSeverity } from '@prisma/client';
import { authenticate, requireRole } from '../../middleware/auth';
import * as eventService from '../../services/event.service';

const router = Router();

router.use(authenticate);

// ─── Cross-Instance Event Queries ────────────────────────────────

// GET /api/events — list events with filters
router.get(
  '/',
  async (req: Request, res: Response) => {
    const { instanceId, severity, acknowledged, source, from, to, page, limit } = req.query;

    const filters: eventService.EventFilters = {
      instanceId: instanceId as string | undefined,
      severity: severity ? (severity as EventSeverity) : undefined,
      acknowledged: acknowledged !== undefined ? acknowledged === 'true' : undefined,
      source: source as string | undefined,
      from: from ? new Date(from as string) : undefined,
      to: to ? new Date(to as string) : undefined,
      page: page ? Math.max(1, parseInt(page as string, 10)) : 1,
      limit: limit ? Math.min(100, Math.max(1, parseInt(limit as string, 10))) : 50,
    };

    const result = await eventService.listEvents(filters);
    res.json(result);
  }
);

// GET /api/events/summary — unacknowledged counts for dashboard
router.get(
  '/summary',
  async (_req: Request, res: Response) => {
    const summary = await eventService.getUnacknowledgedSummary();
    res.json({ data: summary });
  }
);

// PUT /api/events/:id/acknowledge — acknowledge a single event
router.put(
  '/:id/acknowledge',
  requireRole('SUPER_ADMIN', 'OPERATOR'),
  async (req: Request, res: Response) => {
    const event = await eventService.acknowledgeEvent(req.params.id as string, req.user!.id);
    res.json({ data: event });
  }
);

// ─── Instance-Scoped Event Routes ────────────────────────────────
// These are mounted at /api/instances/:id/events via a sub-export

export const instanceEventsRouter = Router({ mergeParams: true });
instanceEventsRouter.use(authenticate);

// GET /api/instances/:id/events
instanceEventsRouter.get(
  '/',
  async (req: Request, res: Response) => {
    const page = Math.max(1, parseInt(req.query.page as string, 10) || 1);
    const limit = Math.min(100, Math.max(1, parseInt(req.query.limit as string, 10) || 50));
    const result = await eventService.listInstanceEvents(req.params.id as string, page, limit);
    res.json(result);
  }
);

// PUT /api/instances/:id/events/acknowledge-all
instanceEventsRouter.put(
  '/acknowledge-all',
  requireRole('SUPER_ADMIN', 'OPERATOR'),
  async (req: Request, res: Response) => {
    const result = await eventService.acknowledgeAllForInstance(req.params.id as string, req.user!.id);
    res.json({ data: result });
  }
);

export default router;