const mysql = require('mysql2/promise');
require('dotenv').config();

const pool = mysql.createPool({
    host: process.env.DB_HOST || '127.0.0.1',
    port: Number(process.env.DB_PORT || 3306),
    user: process.env.DB_USER,
    password: process.env.DB_PASS,
    database: process.env.DB_NAME,
    waitForConnections: true,
    connectionLimit: 10,
    charset: 'utf8mb4_general_ci',
    dateStrings: true,
});

// Mehrere Zeilen
async function q(sql, params = []) {
    const [rows] = await pool.query(sql, params);
    return rows;
}

// Genau eine Zeile (oder null)
async function q1(sql, params = []) {
    const rows = await q(sql, params);
    return rows[0] || null;
}

// INSERT -> insertId
async function insert(sql, params = []) {
    const [res] = await pool.query(sql, params);
    return res.insertId;
}

// UPDATE/DELETE -> affectedRows
async function exec(sql, params = []) {
    const [res] = await pool.query(sql, params);
    return res.affectedRows;
}

module.exports = { pool, q, q1, insert, exec };