on-motorrad-buchungs-plugin/includes/class-on-service-manager.php

<?php
if (!defined('ABSPATH')) {
    exit;
}

class ON_Service_Manager
{
    public function __construct()
    {
        add_action('init', array($this, 'register_service_post_type'));
        register_activation_hook(ON_BOOKING_PATH . 'on-motorrad-buchung.php', array($this, 'create_default_services'));
    }

    public function register_service_post_type()
    {
        $labels = array(
            'name' => 'Services',
            'singular_name' => 'Service',
            'menu_name' => 'Services',
            'add_new' => 'Neuer Service',
            'add_new_item' => 'Neuen Service hinzufügen',
            'edit_item' => 'Service bearbeiten',
            'all_items' => 'Alle Services',
        );

        $args = array(
            'labels' => $labels,
            'public' => false,
            'show_ui' => false, // We'll create custom admin page
            'show_in_menu' => false,
            'capability_type' => 'post',
            'supports' => array('title'),
            'has_archive' => false,
        );

        register_post_type('on_service', $args);
    }

    public function create_default_services()
    {
        // Check if services already exist
        $existing = get_posts(array(
            'post_type' => 'on_service',
            'posts_per_page' => 1,
            'post_status' => 'publish'
        ));

        if (!empty($existing)) {
            return; // Services already created
        }

        $default_services = array(
            array('name' => 'Reifenwechsel', 'duration' => 30),
            array('name' => 'Reifenwechsel vorne und hinten', 'duration' => 60),
            array('name' => 'Jahresinspektion', 'duration' => 90),
            array('name' => 'Ölwechsel', 'duration' => 30),
            array('name' => 'Kettensatzwechsel', 'duration' => 90),
            array('name' => 'Gabelservice', 'duration' => 90),
            array('name' => 'Bremsbeläge wechseln', 'duration' => 30),
            array('name' => 'Bremsscheiben und Beläge', 'duration' => 60),
        );

        foreach ($default_services as $index => $service) {
            $post_id = wp_insert_post(array(
                'post_type' => 'on_service',
                'post_title' => $service['name'],
                'post_status' => 'publish',
            ));

            if ($post_id) {
                update_post_meta($post_id, 'service_duration', $service['duration']);
                update_post_meta($post_id, 'service_active', 1);
                update_post_meta($post_id, 'service_order', $index);
            }
        }
    }

    /**
     * Get all active services
     */
    public static function get_active_services()
    {
        $services = get_posts(array(
            'post_type' => 'on_service',
            'posts_per_page' => -1,
            'post_status' => 'publish',
            'orderby' => 'meta_value_num',
            'meta_key' => 'service_order',
            'order' => 'ASC'
        ));

        $result = array();
        foreach ($services as $service) {
            $active = get_post_meta($service->ID, 'service_active', true);
            if ($active == 1) {
                $result[] = array(
                    'id' => $service->ID,
                    'name' => $service->post_title,
                    'duration' => (int) get_post_meta($service->ID, 'service_duration', true),
                );
            }
        }

        return $result;
    }

    /**
     * Get all services (including inactive)
     */
    public static function get_all_services()
    {
        $services = get_posts(array(
            'post_type' => 'on_service',
            'posts_per_page' => -1,
            'post_status' => 'publish',
            'orderby' => 'meta_value_num',
            'meta_key' => 'service_order',
            'order' => 'ASC'
        ));

        $result = array();
        foreach ($services as $service) {
            $result[] = array(
                'id' => $service->ID,
                'name' => $service->post_title,
                'duration' => (int) get_post_meta($service->ID, 'service_duration', true),
                'active' => (int) get_post_meta($service->ID, 'service_active', true),
            );
        }

        return $result;
    }

    /**
     * Get service by ID
     */
    public static function get_service($service_id)
    {
        $service = get_post($service_id);
        if (!$service || $service->post_type !== 'on_service') {
            return null;
        }

        return array(
            'id' => $service->ID,
            'name' => $service->post_title,
            'duration' => (int) get_post_meta($service->ID, 'service_duration', true),
            'active' => (int) get_post_meta($service->ID, 'service_active', true),
        );
    }
}

new ON_Service_Manager();