<?php

namespace App\Core;

use PDO;
use PDOException;

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

    public static function connection(): PDO
    {
        if (self::$connection === null) {
            $config = config('database');

            $dsn = sprintf(
                'mysql:host=%s;port=%s;dbname=%s;charset=utf8mb4',
                $config['host'],
                $config['port'],
                $config['database']
            );

            $options = [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ];

            try {
                self::$connection = new PDO(
                    $dsn,
                    $config['username'],
                    $config['password'],
                    $options
                );
            } catch (PDOException $exception) {
                throw new \RuntimeException('Database connection failed: ' . $exception->getMessage());
            }
        }

        return self::$connection;
    }
}