const express = require('express');
const db = require('../db');
const auth = require('../middleware/auth');
const router = express.Router();

/* all routes require login. */
router.use(auth);

/* create. */
router.post('/', (req, res) =>
{
   const { title, description } = req.body;
   if (!title) return res.status(400).json({ error: 'Title required' });
   const result = db.prepare(
      'INSERT INTO tasks (user_id, title, description) VALUES (?, ?, ?)'
   ).run(req.session.userId, title, description || '');
   res.json({ id: result.lastInsertRowid, title, description: description || '', done: 0 });
});

/* read all. */
router.get('/', (req, res) =>
{
   const rows = db.prepare('SELECT * FROM tasks WHERE user_id = ?').all(req.session.userId);
   res.json(rows);
});

/* read on. */
router.get('/:id', (req, res) =>
{
   const row = db.prepare('SELECT * FROM tasks WHERE id = ? AND user_id = ?').get(req.params.id, req.session.userId);
   if (!row) return res.status(404).json({ error: 'Task not found' });
   res.json(row);
});

/* update. */
router.put('/:id', (req, res) =>
{
   const { title, description, done } = req.body;
   const result = db.prepare(
      'UPDATE tasks SET title = COALESCE(?, title), description = COALESCE(?, description), done = COALESCE(?, done) WHERE id = ? AND user_id = ?'
   ).run(title, description, done, req.params.id, req.session.userId);
   if (result.changes === 0) return res.status(404).json({ error: 'Task not found' });
   res.json({ id: Number(req.params.id), title, description, done });
});

/* delete. */
router.delete('/:id', (req, res) =>
{
   const result = db.prepare('DELETE FROM tasks WHERE id = ? AND user_id = ?').run(req.params.id, req.session.userId);
   if (result.changes === 0) return res.status(404).json({ error: 'Task not found' });
   res.json({ message: 'Deleted' });
});

module.exports = router;