NoteCat/src/Dependencies.php

<?php
declare(strict_types=1);

namespace NoteCat;

use DI\Container;
use Psr\Container\ContainerInterface;
use Slim\Views\Twig;

class Dependencies
{
    private const TWIG = 'view';
    private const TWIG_TEMPLATE_DIR = __DIR__ . '/../templates';

    public static function createContainer(): Container
    {
        $container = new Container();

        // App settings
        $container->set(Settings::class, function (): Settings {
            return new Settings();
        });

        // Twig template engine
        $container->set(self::TWIG, function (ContainerInterface $c) {
            /** @var Settings $settings */
            $settings = $c->get(Settings::class);

            return Twig::create(self::TWIG_TEMPLATE_DIR, $settings->getTwigSettings());
        });

        // Controllers
        $container->set(HelloWorldController::class, function (ContainerInterface $c) {
            return new HelloWorldController(
                $c->get(self::TWIG),
                $c->get(HelloWorld::class)
            );
        });

        // Services
        $container->set(HelloWorld::class, function () {
            return new HelloWorld();
        });

        return $container;
    }
}