import type { NextApiRequest, NextApiResponse } from 'next';
import mysql from 'mysql2/promise';

interface Category {
  id: number;
  name: string;
  slug: string;
  sort_order: number;
}

interface ErrorResponse {
  error: string;
}

const pool = mysql.createPool({
  host: process.env.DB_HOST || 'localhost',
  user: process.env.DB_USER || 'root',
  password: process.env.DB_PASSWORD || '',
  database: process.env.DB_NAME || 'perfume_shop',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
});

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse<Category[] | ErrorResponse>
) {
  if (req.method !== 'GET') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    const connection = await pool.getConnection();

    const query = `
      SELECT
        c.id,
        c.name,
        c.slug,
        c.sort_order
      FROM categories c
      WHERE c.active = 1
      ORDER BY c.sort_order ASC
    `;

    const [rows] = await connection.query(query);
    connection.release();

    res.status(200).json(rows as any[]);
  } catch (error) {
    res.status(500).json({ error: 'Failed to fetch categories' });
  }
}