import { Router } from 'express';
import db from '../db/db';

const router = Router();

// ── Lists ──────────────────────────────────────────────────────────────────
router.get('/lists', (_req, res) => {
  res.json(db.prepare('SELECT * FROM shopping_lists ORDER BY name ASC').all());
});

router.post('/lists', (req, res) => {
  const { name } = req.body as { name: string };
  if (!name?.trim()) return res.status(400).json({ error: 'Name is required' });
  const result = db.prepare('INSERT INTO shopping_lists (name) VALUES (?)').run(name.trim());
  res.status(201).json(db.prepare('SELECT * FROM shopping_lists WHERE id = ?').get(result.lastInsertRowid));
});

router.delete('/lists/:id', (req, res) => {
  const result = db.prepare('DELETE FROM shopping_lists WHERE id = ?').run(req.params.id);
  if (result.changes === 0) return res.status(404).json({ error: 'List not found' });
  res.status(204).end();
});

// ── Items ──────────────────────────────────────────────────────────────────
router.get('/lists/:listId/items', (req, res) => {
  res.json(
    db.prepare('SELECT * FROM shopping_items WHERE list_id = ? ORDER BY sort_order ASC, id ASC').all(req.params.listId)
  );
});

router.post('/lists/:listId/items', (req, res) => {
  const { name, quantity, member_id } = req.body as { name: string; quantity?: string; member_id?: number };
  if (!name?.trim()) return res.status(400).json({ error: 'Name is required' });
  const maxOrder = (db.prepare('SELECT MAX(sort_order) as m FROM shopping_items WHERE list_id = ?').get(req.params.listId) as any)?.m ?? 0;
  const result = db
    .prepare('INSERT INTO shopping_items (list_id, name, quantity, member_id, sort_order) VALUES (?, ?, ?, ?, ?)')
    .run(req.params.listId, name.trim(), quantity ?? null, member_id ?? null, maxOrder + 1);
  res.status(201).json(db.prepare('SELECT * FROM shopping_items WHERE id = ?').get(result.lastInsertRowid));
});

router.patch('/items/:id', (req, res) => {
  const existing = db.prepare('SELECT * FROM shopping_items WHERE id = ?').get(req.params.id) as any;
  if (!existing) return res.status(404).json({ error: 'Item not found' });
  const { name, quantity, checked, member_id, sort_order } = req.body;
  db.prepare('UPDATE shopping_items SET name=?, quantity=?, checked=?, member_id=?, sort_order=? WHERE id=?').run(
    name?.trim() ?? existing.name,
    quantity !== undefined ? quantity : existing.quantity,
    checked !== undefined ? (checked ? 1 : 0) : existing.checked,
    member_id !== undefined ? member_id : existing.member_id,
    sort_order !== undefined ? sort_order : existing.sort_order,
    req.params.id
  );
  res.json(db.prepare('SELECT * FROM shopping_items WHERE id = ?').get(req.params.id));
});

router.delete('/items/:id', (req, res) => {
  const result = db.prepare('DELETE FROM shopping_items WHERE id = ?').run(req.params.id);
  if (result.changes === 0) return res.status(404).json({ error: 'Item not found' });
  res.status(204).end();
});

router.delete('/lists/:listId/items/checked', (req, res) => {
  db.prepare('DELETE FROM shopping_items WHERE list_id = ? AND checked = 1').run(req.params.listId);
  res.status(204).end();
});

export default router;