<?php
declare(strict_types=1);

namespace Core\Services;

use PDO;
use PDOException;

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

    public static function get(): ?PDO
    {
        if (self::$pdo instanceof PDO) {
            return self::$pdo;
        }

        $configPath = __DIR__ . '/../../storage/db.php';
        if (!is_file($configPath)) {
            return null;
        }

        $config = require $configPath;
        if (!is_array($config)) {
            return null;
        }

        $host = (string)($config['host'] ?? 'localhost');
        $db = (string)($config['database'] ?? '');
        $user = (string)($config['user'] ?? '');
        $pass = (string)($config['pass'] ?? '');
        $port = (int)($config['port'] ?? 3306);
        if ($db == '' || $user == '') {
            return null;
        }

        $dsn = "mysql:host={$host};dbname={$db};port={$port};charset=utf8mb4";
        try {
            self::$pdo = new PDO($dsn, $user, $pass, [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            ]);
        } catch (PDOException $e) {
            return null;
        }

        return self::$pdo;
    }
}