import { Router, Response } from 'express';
import { z } from 'zod';
import db from '../db.js';
import { AuthRequest } from '../middleware/auth.js';

const router = Router();

const registerSchema = z.object({
  device_name: z.string().min(1),
});

router.post('/register', (req: AuthRequest, res: Response) => {
  const parsed = registerSchema.safeParse(req.body);
  if (!parsed.success) {
    res.status(400).json({ error: parsed.error.errors });
    return;
  }

  const { device_name } = parsed.data;

  const existing = db
    .prepare('SELECT id FROM devices WHERE user_id = ? AND device_name = ?')
    .get(req.userId!, device_name);

  if (existing) {
    db.prepare('UPDATE devices SET last_sync_at = CURRENT_TIMESTAMP WHERE id = ?').run((existing as any).id);
    res.json({ deviceId: (existing as any).id });
    return;
  }

  const result = db
    .prepare('INSERT INTO devices (user_id, device_name, last_sync_at) VALUES (?, ?, CURRENT_TIMESTAMP)')
    .run(req.userId!, device_name);

  res.status(201).json({ deviceId: result.lastInsertRowid });
});

export default router;