coding-challenge-online-shop/src/core/Core.php

<?php
namespace core;

use entity\user\UserInterface;

/**
 *
 * @author kevinfrantz
 *        
 */
final class Core implements CoreInterface
{

    const DATABASE_USERNAME = 'devuser';

    const DATABASE_PASSWORD = 'devpass';

    const DATABASE_NAME = 'test_db';

    const DATABASE_PORT = '3306';

    const DATABASE_HOST = 'codingchallengeonlineshop_db_1';

    /**
     *
     * @var \Twig_Environment
     */
    private $twig;

    /**
     *
     * @var UserInterface
     */
    private $user;

    /**
     *
     * @var \PDO
     */
    private $database;

    public function __construct()
    {
        $this->initTwig();
        $this->initDatabase();
        $this->initUser();
    }

    /**
     * Loads user by session
     */
    private function initUser(): void
    {
        if($_SESSION['user']){
            $this->user = $_SESSION['user'];
        }
    }

    private function initTwig(): void
    {
        $loader = new \Twig_Loader_Filesystem(__DIR__ . '/../template');
        $this->twig = new \Twig_Environment($loader);
    }

    private function initDatabase(): void
    {
        $this->database = new \PDO('mysql:host=' . self::DATABASE_HOST . ';dbname=' . self::DATABASE_NAME . ';port=' . self::DATABASE_PORT, self::DATABASE_USERNAME, self::DATABASE_PASSWORD);
    }

    public function getDatabase(): \PDO
    {
        return $this->database;
    }

    public function getTwig(): \Twig_Environment
    {
        return $this->twig;
    }

    public function getUser(): ?UserInterface
    {
        return $this->user;
    }

    public function setUser(?UserInterface $user = null): void
    {
        $_SESSION['user'] = $this->user = $user;
    }
}