<?php
/**
 * Simple PDO Database Wrapper
 */

declare(strict_types=1);

namespace App\Core;

use PDO;
use PDOException;

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

    public static function getInstance(): PDO
    {
        if (self::$instance === null) {
            $config = require APP_PATH . '/config/database.php';
            
            $dsn = sprintf(
                "mysql:host=%s;port=%s;dbname=%s;charset=%s",
                $config['host'],
                $config['port'],
                $config['database'],
                $config['charset']
            );

            try {
                self::$instance = new PDO($dsn, $config['username'], $config['password'], [
                    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                    PDO::ATTR_EMULATE_PREPARES   => false,
                ]);
            } catch (PDOException $e) {
                http_response_code(500);
                header('Content-Type: application/json');
                echo json_encode(['success' => false, 'message' => 'Database connection failed']);
                exit;
            }
        }

        return self::$instance;
    }

    public static function generateUuid(): string
    {
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4));
    }
}