<?php
require_once __DIR__ . "/config.php";

$pdo = connectDatabase($dsn, $pdoOptions);

/** Function tries to connect to database using PDO
 * @param string $dsn
 * @param array $pdoOptions
 * @return PDO
 */
function connectDatabase(string $dsn, array $pdoOptions): PDO
{

    try {
        $pdo = new PDO($dsn, PARAMS['USER'], PARAMS['PASSWORD'], $pdoOptions);
    } catch (\PDOException $e) {
        var_dump($e->getCode());
        throw new \PDOException($e->getMessage());
    }

    return $pdo;
}

function parseCategories(string $cat_string)
{
    $cat_string = trim($cat_string);
    $cats = explode(" ", $cat_string);

    $filtered_cats = array_filter($cats, function($cat) {
        if(mb_strlen($cat) <= 4)
            return false;

        return(ctype_alnum($cat));
    });

    return $filtered_cats;
}

function insertCategories(array $cats) {
    global $pdo;

    try {
        $pdo->beginTransaction();

        $stmt = $pdo->prepare("INSERT INTO categories (name, code) VALUES (:name, :code)");
        foreach ($cats as $cat_code => $cat_name) {
            $stmt->execute([
                ':name' => $cat_name,
                ':code' => $cat_code
            ]);
        }

        $pdo->commit();
    }
    catch (Exception $e) {
        $pdo->rollBack();
        throw $e;
    }
}

class User {
    function createUser() {

    }
    function createUserStmt() {

    }
    function createUsers() {
        
    }
}