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

// Get all categories
router.get('/', (req, res) => {
  db.all('SELECT * FROM categories ORDER BY name', (err, rows) => {
    if (err) {
      console.error(err);
      res.status(500).json({ error: 'Database error' });
    } else {
      res.json(rows);
    }
  });
});

// Get category by ID
router.get('/:id', (req, res) => {
  const { id } = req.params;
  db.get('SELECT * FROM categories WHERE id = ?', [id], (err, row) => {
    if (err) {
      console.error(err);
      res.status(500).json({ error: 'Database error' });
    } else if (!row) {
      res.status(404).json({ error: 'Category not found' });
    } else {
      res.json(row);
    }
  });
});

// Create new category
router.post('/', (req, res) => {
  const { name, description } = req.body;
  
  if (!name) {
    return res.status(400).json({ error: 'Name is required' });
  }

  db.run(
    'INSERT INTO categories (name, description) VALUES (?, ?)',
    [name, description],
    function(err) {
      if (err) {
        console.error(err);
        res.status(500).json({ error: 'Database error' });
      } else {
        res.status(201).json({ 
          id: this.lastID, 
          name, 
          description 
        });
      }
    }
  );
});

// Update category
router.put('/:id', (req, res) => {
  const { id } = req.params;
  const { name, description } = req.body;

  if (!name) {
    return res.status(400).json({ error: 'Name is required' });
  }

  db.run(
    'UPDATE categories SET name = ?, description = ? WHERE id = ?',
    [name, description, id],
    function(err) {
      if (err) {
        console.error(err);
        res.status(500).json({ error: 'Database error' });
      } else if (this.changes === 0) {
        res.status(404).json({ error: 'Category not found' });
      } else {
        res.json({ id: parseInt(id), name, description });
      }
    }
  );
});

// Delete category
router.delete('/:id', (req, res) => {
  const { id } = req.params;
  
  db.run('DELETE FROM categories WHERE id = ?', [id], function(err) {
    if (err) {
      console.error(err);
      res.status(500).json({ error: 'Database error' });
    } else if (this.changes === 0) {
      res.status(404).json({ error: 'Category not found' });
    } else {
      res.json({ message: 'Category deleted successfully' });
    }
  });
});

module.exports = router;