<?php
declare(strict_types=1);

namespace WPMultiCity;

final class Redirect
{
    public static function register(): void
    {
        \add_action('wp', [self::class, 'handle'], 9998);
    }

    public static function handle(): void
    {
        if (\is_admin()) {
            return;
        }
        if (\defined('DOING_AJAX') && \DOING_AJAX) {
            return;
        }
        $main = Helpers::main_town_slug();
        if ($main === null) {
            return;
        }
        global $post;
        if (!isset($post->ID)) {
            return;
        }
        $current_page_id = (int) $post->ID;
        if (!\function_exists('get_field')) {
            return;
        }
        $page_unic = \get_field('page_unic', 'option');
        if (!is_array($page_unic)) {
            return;
        }
        $request_uri = $_SERVER['REQUEST_URI'] ?? '/';
        foreach ($page_unic as $row) {
            if (!is_array($row)) {
                continue;
            }
            if ((int) ($row['page_new'] ?? 0) !== $current_page_id) {
                continue;
            }
            $town_term_id = (int) ($row['town'] ?? 0);
            if (!$town_term_id) {
                continue;
            }
            $term = \get_term_by('id', $town_term_id, 'town');
            if (!($term instanceof \WP_Term) || $term->slug === '' || $term->slug === $main) {
                continue;
            }
            $town_slug = $term->slug;
            if (preg_match('#^/' . preg_quote($town_slug, '#') . '(/|$)#', $request_uri)) {
                return;
            }
            $orig_id = (int) ($row['page_old'] ?? 0);
            if (!$orig_id) {
                return;
            }
            $orig_permalink = Helpers::without_url_filters(static fn () => \get_permalink($orig_id));
            if (!is_string($orig_permalink) || $orig_permalink === '') {
                return;
            }
            $path_only = Helpers::remove_domain_link($orig_permalink);
            $redirect_to = '/' . $town_slug . $path_only;
            \wp_safe_redirect($redirect_to, 301);
            exit;
        }
    }
}