<?php
namespace App;

use PDO;
use PDOException;

class Db
{
    // Простая фабрика PDO по логину/паролю MariaDB из сессии
    public static function connectFromSession(): PDO
    {
        if (empty($_SESSION['db_user']) || empty($_SESSION['db_pass'])) {
            throw new \RuntimeException('Not authenticated');
        }

        $user = $_SESSION['db_user'];
        $pass = $_SESSION['db_pass'];

        // TODO: вынести host/port/charset в конфиг .env
        $dsn = 'mysql:host=localhost;port=3306;charset=utf8mb4';

        $pdo = new PDO($dsn, $user, $pass, [
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_EMULATE_PREPARES   => false, // важная настройка [web:28][web:25]
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        ]);

        return $pdo;
    }

    public static function testConnection(string $user, string $pass): void
    {
        $dsn = 'mysql:host=localhost;port=3306;charset=utf8mb4'; // MariaDB совместим [web:22][web:28]
        try {
            new PDO($dsn, $user, $pass, [
                PDO::ATTR_ERRMODE          => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_EMULATE_PREPARES => false,
            ]);
        } catch (PDOException $e) {
            throw new \RuntimeException('Connection failed: ' . $e->getMessage());
        }
    }
}