<?php
namespace CakeDC\Users\View\Helper;

use CakeDC\Users\Controller\Component\UsersAuthComponent;
use Cake\Event\Event;
use Cake\Utility\Hash;
use Cake\View\Helper;
use Cake\View\Helper\HtmlHelper;

/**
 * AuthLink helper
 */
class AuthLinkHelper extends HtmlHelper
{

    /**
     * Generate a link if the target url is authorized for the logged in user
     *
     * @param string $title link's title.
     * @param string|array|null $url url that the user is making request.
     * @param array $options Array with option data.
     * @return string
     */
    public function link($title, $url = null, array $options = [])
    {
        if ($this->isAuthorized($url)) {
            $linkOptions = $options;
            unset($linkOptions['before'], $linkOptions['after']);

            return Hash::get($options, 'before') . parent::link($title, $url, $linkOptions) . Hash::get($options, 'after');
        }

        return false;
    }

    /**
     * Returns true if the target url is authorized for the logged in user
     *
     * @param string|array|null $url url that the user is making request.
     * @return bool
     */
    public function isAuthorized($url = null)
    {
        $event = new Event(UsersAuthComponent::EVENT_IS_AUTHORIZED, $this, ['url' => $url]);
        $result = $this->_View->eventManager()->dispatch($event);

        return $result->result;
    }
}