<?php

namespace sidebarsingle;

use Craft;
use craft\events\RegisterCpNavItemsEvent;
use craft\models\Section;
use yii\base\Event;
use craft\elements\Entry;

class Module extends \yii\base\Module
{
    public function __construct($id, $parent = null, array $config = [])
    {
        parent::__construct($id, $parent, $config);

        // Attach the event handler when the module is initialized
        Craft::$app->onInit(function () {
            $this->registerEventHandlers();
        });
    }

    private function registerEventHandlers()
    {
        // Listen for the CP navigation item registration event
        Event::on(
            \craft\web\twig\variables\Cp::class,
            \craft\web\twig\variables\Cp::EVENT_REGISTER_CP_NAV_ITEMS,
            function (RegisterCpNavItemsEvent $event) {
                // Fetch all singles for the current site
                $singles = $this->getCurrentSiteSingles();

                // Add a navigation item for each single
                foreach ($singles as $single) {
                    array_unshift($event->navItems, [
                        'url' => 'entries/' . $single->section->handle . '/' . $single->id . '-' . $single->slug, // URL for the single
                        'label' => 'Landing Page',
                        'icon' => '@appicons/house.svg', // Optional icon
                    ]);
                };

            }
        );
    }

    /**
     * Fetch all singles for the current site
     *
     * @return array The singles for the current site
     */
    private function getCurrentSiteSingles()
    {
        // Get the currently active site
        $currentSiteHandle = Craft::$app->getRequest()->getParam('site', Craft::$app->getSites()->getCurrentSite());
        $currentSite = Craft::$app->getSites()->getSiteByHandle($currentSiteHandle);

        if ($currentSite) {
            // Get the current site's ID
            $currentSiteId = $currentSite->id;

            // Fetch all singles
            $singles = Craft::$app->entries->getSectionsByType(Section::TYPE_SINGLE);

            // Find the single for the current site and return it
            $singlesForCurrentSite = array_filter($singles, function ($single) use ($currentSiteId) {
                return in_array($currentSiteId, $single->getSiteIds());
            });

            // Fetch the associated entries to get the slugs
            $entries = [];
            foreach ($singlesForCurrentSite as $single) {
                $entry = Entry::find()
                    ->sectionId($single->id) // Filter by the section ID
                    ->siteId($currentSiteId) // Ensure it's for the current site
                    ->one();

                if ($entry) {
                    $entries[] = $entry;
                }
            }

            return $entries;

        } else {
            echo 'Error: Active site not found.';
            return [];
        }
    }
}