<?php
/**
 * Connexion à la base de données (Singleton)
 */

declare(strict_types=1);

class Database
{
    private static ?PDO $instance = null;

    public static function getInstance(): PDO
    {
        if (self::$instance === null) {
            try {
                self::$instance = new PDO(
                    sprintf('mysql:host=%s;dbname=%s;charset=utf8mb4', DB_HOST, DB_NAME),
                    DB_USER,
                    DB_PASS,
                    [
                        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                        PDO::ATTR_EMULATE_PREPARES => false,
                    ]
                );
            } catch (PDOException $e) {
                Response::error('Database connection failed', 500);
                exit;
            }
        }

        return self::$instance;
    }

    // Empêcher le clonage et la désérialisation
    private function __construct() {}
    private function __clone() {}
    public function __wakeup() {}
}