<?php

namespace KupShop\ContentBundle\Util;

use KupShop\ContentBundle\Exception\UnknownPageTypeException;
use KupShop\ContentBundle\Page\PageInterface;
use Symfony\Component\DependencyInjection\ServiceLocator;

class PageLocator
{
    private $locator;
    private $pages;

    public function __construct(ServiceLocator $locator, array $pages)
    {
        $this->locator = $locator;
        $this->pages = $pages;
    }

    public function getTypes()
    {
        return array_keys($this->pages);
    }

    /**
     * @return PageInterface
     *
     * @throws UnknownPageTypeException
     */
    public function getPageService(string $type)
    {
        if (isset($this->pages[$type])) {
            $class = $this->pages[$type]['class'];
            if ($this->locator->has($class)) {
                return $this->locator->get($class);
            }
        }

        throw new UnknownPageTypeException($type);
    }
}