wp-multi-city/includes/class-plugin.php

<?php
declare(strict_types=1);

namespace WPMultiCity;

final class Plugin
{
    private static ?Plugin $instance = null;
    private bool $booted = false;

    public static function instance(): Plugin
    {
        if (self::$instance === null) self::$instance = new self();
        return self::$instance;
    }

    public static function register_autoloader(): void
    {
        spl_autoload_register(static function (string $class): void {
            if (strpos($class, 'WPMultiCity\\') !== 0) return;
            $relative = substr($class, strlen('WPMultiCity\\'));
            $slug = strtolower(preg_replace('/([a-z0-9])([A-Z])/', '$1-$2', $relative));
            $slug = str_replace('_', '-', $slug);
            $candidates = [
                dirname(__DIR__) . '/includes/class-' . $slug . '.php',
                dirname(__DIR__) . '/includes/' . $slug . '.php',
                dirname(__DIR__) . '/admin/class-' . $slug . '.php',
            ];
            foreach ($candidates as $path) {
                if (is_file($path)) {
                    require_once $path;
                    return;
                }
            }
        });
    }

    public function boot(): void
    {
        if ($this->booted) {
            return;
        }
        $this->booted = true;

        if (!$this->dependencies_satisfied()) {
            add_action('admin_notices', [$this, 'render_dependency_notice']);
            return;
        }

        Taxonomy::register();
        PostType::register();
        FieldGroup::register();
    }

    private function dependencies_satisfied(): bool
    {
        return class_exists('ACF') || function_exists('acf_add_local_field_group');
    }

    public function render_dependency_notice(): void
    {
        if (!current_user_can('activate_plugins')) return;
        echo '<div class="notice notice-error"><p><strong>WP Multi City:</strong> требуется активный плагин Advanced Custom Fields Pro.</p></div>';
    }
}