<?php

declare(strict_types=1);

namespace ProCalendarWP\Seo;

use ProCalendarWP\Contracts\Module;

final class CalendarSeo implements Module
{
    public function register(): void
    {
        add_filter('wp_robots', [$this, 'robots']);
        add_filter('wpseo_robots_array', [$this, 'pluginRobots']);
        add_filter('rank_math/frontend/robots', [$this, 'pluginRobots']);
        add_filter('wpseo_canonical', [$this, 'canonical']);
        add_filter('rank_math/frontend/canonical', [$this, 'canonical']);
        add_action('template_redirect', [$this, 'emptyFuture']);
    }

    private function navigated(): bool
    {
        foreach (array_keys($_GET) as $key) {
            if (preg_match('/^pcwp_(?:[a-z0-9_-]+_)?(?:start|end|keyword|category|tag|venue|organizer|view|status|mode|series|weekday|time_from|time_to|min_price|max_price|latitude|longitude|radius|featured|page|tax_[a-z0-9_]+|custom_[a-z0-9_]+)$/D', (string) $key)) {
                $post = get_post();
                return is_post_type_archive('pcwp_event') || ($post instanceof \WP_Post && (bool) preg_match('~pro-calendar-wp/(?:month|week|day|list|photo|map)-calendar|\[pcwp_(?:calendar|event_list|upcoming_events)|"namespace"\s*:\s*"pro-calendar-wp/event-query"~', $post->post_content));
            }
        }
        return false;
    }

    /**
     * @param array<string,mixed> $robots
     * @return array<string,mixed>
     */
    public function robots(array $robots): array
    {
        if ($this->navigated()) {
            unset($robots['index']);
            $robots['noindex'] = true;
        }
        return $robots;
    }

    /**
     * @param array<string,mixed> $robots
     * @return array<string,mixed>
     */
    public function pluginRobots(array $robots): array
    {
        if ($this->navigated()) {
            $robots['index'] = 'noindex';
        }
        return $robots;
    }

    public function canonical(string $url): string
    {
        if (is_singular('pcwp_event')) {
            return (string) get_permalink(get_queried_object_id());
        }
        return $url;
    }

    public function emptyFuture(): void
    {
        $start = sanitize_text_field(wp_unslash($_GET['pcwp_start'] ?? ''));
        if (! is_post_type_archive('pcwp_event') || ! preg_match('/^\d{4}-\d{2}-\d{2}$/D', $start) || $start <= gmdate('Y-m-d', strtotime('+2 years'))) {
            return;
        }
        if (\ProCalendarWP\Plugin::instance()->events()->occurrences(['start' => $start, 'end' => $start . 'T23:59:59', 'limit' => 1]) === []) {
            global $wp_query;
            $wp_query->set_404();
            status_header(404);
            nocache_headers();
        }
    }
}