<?php

declare(strict_types=1);

namespace App;

use PDO;
use PDOException;

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

    public static function connection(): PDO
    {
        if (self::$pdo !== null) {
            return self::$pdo;
        }

        $dsn = sprintf(
            'mysql:host=%s;port=%s;dbname=%s;charset=%s',
            Config::get('db.host'),
            Config::get('db.port'),
            Config::get('db.name'),
            Config::get('db.charset', 'utf8mb4')
        );

        try {
            self::$pdo = new PDO($dsn, (string) Config::get('db.user'), (string) Config::get('db.pass'), [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ]);
        } catch (PDOException $e) {
            throw new \RuntimeException('Database connection failed.');
        }

        return self::$pdo;
    }
}