const express = require('express');
const router = express.Router();
const { query } = require('../config/db');

// GET /api/categories
router.get('/', async (_, res) => {
  try {
    const { rows } = await query('SELECT * FROM categories ORDER BY sort_order');
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// GET /api/categories/:slug/articles
router.get('/:slug/articles', async (req, res) => {
  try {
    const limit = Math.min(parseInt(req.query.limit) || 20, 100);
    const offset = parseInt(req.query.offset) || 0;
    const { rows } = await query(
      `SELECT id,slug,title,excerpt,cover_url,tags,category,author,reading_time,published_at
       FROM articles WHERE status='published' AND category=$1
       ORDER BY published_at DESC LIMIT $2 OFFSET $3`,
      [req.params.slug, limit, offset]
    );
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

module.exports = router;