<?php 

namespace App\Core;

use PDO;

class Database {
    private static $instance = null;
    private $connection;

    private function __construct() {
        $config = require __DIR__ . '/../Config/database.php';

        $dsn = "mysql:host={$config['host']};dbname={$config['db']};charset=utf8mb4";
        $this->connection = new PDO($dsn, $config['user'], $config['pass'], [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
        ]);
    }

    public static function getInstance() {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance->connection;
    }
}

// Usage in a Model:
// $db = \App\Core\Database::getInstance();
// $stmt = $db->query("SELECT * FROM users");

 ?>