<?php
declare(strict_types=1);

session_start();
header('Content-Type: application/json; charset=utf-8');

$DB_HOST = '127.0.0.1';
$DB_NAME = 'space_odyssey';
$DB_USER = 'root';
$DB_PASS = '';

function json_out(int $status, array $data): void {
  http_response_code($status);
  echo json_encode($data, JSON_UNESCAPED_UNICODE);
  exit;
}

try {
  $dsn = "mysql:host={$DB_HOST};dbname={$DB_NAME};charset=utf8mb4";
  $pdo = new PDO($dsn, $DB_USER, $DB_PASS, [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
  ]);
} catch (Throwable $e) {
  json_out(500, ['ok' => false, 'error' => 'DB connection failed']);
}

function current_user(PDO $pdo): ?array {
  if (!isset($_SESSION['user_id'])) return null;
  $stmt = $pdo->prepare('SELECT id, username, email, created_at FROM users WHERE id = ? LIMIT 1');
  $stmt->execute([(int)$_SESSION['user_id']]);
  $u = $stmt->fetch();
  return $u ?: null;
}