import { Router, type Request, type Response } from 'express';
import { z } from 'zod';
import { createLogger } from '../lib/logger.js';
import { getTripStore } from '../lib/tripStore.js';

const log = createLogger('trips-api');
const router = Router();

const TripBodySchema = z.object({
  title: z.string().min(1).max(200),
  vehicleModel: z.string().min(1).max(120),
  rangeMi: z.number().int().nonnegative(),
  itinerary: z.unknown().transform((v) => v ?? null),
  status: z.string().max(40).optional(),
  isPublic: z.boolean().optional(),
});

const TripPatchSchema = TripBodySchema.partial();

const ANONYMOUS_USER_ID = 'anonymous';

function resolveUserId(req: Request): string {
  return req.auth?.userId ?? ANONYMOUS_USER_ID;
}

router.get('/', async (req, res) => {
  const userId = resolveUserId(req);
  const trips = await getTripStore().list(userId);
  res.json({ trips });
});

router.get('/:id', async (req, res) => {
  const userId = resolveUserId(req);
  const trip = await getTripStore().get(String(req.params.id), userId);
  if (!trip) return res.status(404).json({ error: 'Trip not found' });
  res.json(trip);
});

router.post('/', async (req, res) => {
  const parsed = TripBodySchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: 'Invalid trip', issues: parsed.error.format() });
  }
  const userId = resolveUserId(req);
  const trip = await getTripStore().create({
    ...parsed.data,
    userId,
    status: parsed.data.status ?? 'planning',
    isPublic: parsed.data.isPublic ?? false,
  });
  log.info({ tripId: trip.id, userId }, 'Trip created');
  res.status(201).json(trip);
});

router.patch('/:id', async (req, res) => {
  const parsed = TripPatchSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: 'Invalid trip patch', issues: parsed.error.format() });
  }
  const userId = resolveUserId(req);
  const trip = await getTripStore().update(String(req.params.id), userId, parsed.data);
  if (!trip) return res.status(404).json({ error: 'Trip not found' });
  res.json(trip);
});

router.delete('/:id', async (req: Request, res: Response) => {
  const userId = resolveUserId(req);
  const removed = await getTripStore().remove(String(req.params.id), userId);
  if (!removed) return res.status(404).json({ error: 'Trip not found' });
  res.status(204).end();
});

export default router;