Reservair/reservair.php

<?php
/**
 * Plugin Name:       Reservair
 * Description:       A reservation and booking system for WordPress. Site visitors browse available time slots and submit reservation requests via a Gutenberg block; administrators manage timetables, services, forms, and reservations from the WordPress admin panel.
 * Version:           0.1.0
 * Requires at least: 6.7
 * Requires PHP:      7.4
 * Author:            Martin Slachta
 * License:           GPL-2.0-or-later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       reservair
 *
 * @package           reservair
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

require_once __DIR__ . '/vendor/autoload.php';

require_once __DIR__ . '/admin.php';

register_activation_hook( __FILE__, [ 'RsvInstaller', 'install' ] );

/**
 * Wires up the plugin's runtime services on `plugins_loaded` instead of at
 * file-include time, so that nothing is instantiated until WordPress (and any
 * plugins we might interact with) is fully loaded.
 */
function rsv_bootstrap(): void {
	global $rsv_form_registry;

	// Re-grant the custom capability after a plugin *update* (the activation hook
	// only runs on activate). No-op once the stored version matches.
	RsvCapabilities::ensure();

	RsvEventDispatcher::init( new RsvWordPressEventBus() );

	RsvGoogleCalendarListener::register();
	RsvEmailListener::register();

	// Shared element registry — consumed via `global $rsv_form_registry` by the
	// form processor, HTML renderer, and the form-admin pages.
	$rsv_form_registry = new RsvFormElementRegistry();
	$rsv_form_registry->register( 'input-text',                 new RsvTextFieldElementHandler() );
	$rsv_form_registry->register( 'button',                     new RsvButtonElementHandler() );
	$rsv_form_registry->register( 'reservation',                new RsvFormReservationElementHandler() );
	$rsv_form_registry->register( 'output-reservation-summary', new RsvReservationSummaryElementHandler() );
}

add_action( 'plugins_loaded', 'rsv_bootstrap' );

add_action( 'admin_menu',           'rsv_admin_menu_definition' );
add_action( 'init',                 'rsv_register_block' );
add_action( 'enqueue_block_assets', 'rsv_enqueue_assets' );
add_action( 'admin_enqueue_scripts', 'rsv_enqueue_admin_assets' );
add_action( 'wp_dashboard_setup',   'rsv_add_dashboard_widget' );
add_action( 'rest_api_init',        'rsv_define_rest_api' );

/**
 * Registers the block using the metadata loaded from the `block.json` file.
 * Behind the scenes, it registers also all assets so they can be enqueued
 * through the block editor in the corresponding context.
 *
 * @see https://developer.wordpress.org/reference/functions/register_block_type/
 */
function rsv_register_block() {
	register_block_type( __DIR__ . '/build' );
}

function rsv_add_dashboard_widget() {
    wp_add_dashboard_widget(
        'rsv_pending_reservations_widget',
        'Pending Reservation Requests',
        'rsv_pending_reservations_widget_render'
    );
}

/**
 * Renders the "Pending Reservation Requests" dashboard widget.
 */
function rsv_pending_reservations_widget_render(): void {
    $url = admin_url( 'admin.php?page=reservations-settings' );
    echo '<p>' . esc_html__( 'Manage and review reservation requests from the Reservations admin page.', 'reservair' ) . '</p>';
    echo '<p><a href="' . esc_url( $url ) . '" class="button button-primary">'
        . esc_html__( 'Open Reservations', 'reservair' ) . '</a></p>';
}

function rsv_google_oauth_callback($request) {
    $code = sanitize_text_field($request->get_param('code'));

    if (!$code) {
        return new WP_REST_Response(['error' => 'No code received'], 400);
    }

    $service = new RsvGoogleCalendarService();
    if ($service->exchange_code($code)) {
        $service->register_webhook();
        wp_redirect(admin_url('admin.php?page=rsv-google-calendar&connected=1'));
        exit;
    }

    return new WP_REST_Response(['error' => 'Token exchange failed'], 500);
}

function rsv_google_calendar_webhook(WP_REST_Request $request): WP_REST_Response {
    $headers = $request->get_headers();

    $channel_id     = $headers['x_goog_channel_id'][0]    ?? '';
    $resource_state = $headers['x_goog_resource_state'][0] ?? '';

    if ($channel_id !== get_option('rsv_google_webhook_channel_id')) {
        return new WP_REST_Response(['error' => 'Invalid channel'], 400);
    }

    // Google sends a 'sync' notification when the webhook is first registered.
    if ($resource_state === 'sync') {
        return new WP_REST_Response(['status' => 'ok'], 200);
    }

    $gcal    = new RsvGoogleCalendarService();
    $actions = $gcal->process_changes();
    $service = new RsvTimetableReservationService();

    foreach ($actions as $action) {
        try {
            if ($action['action'] === 'accept') {
                $service->accept_by_reservation_id($action['reservation_id']);
            } else {
                $service->refuse_by_reservation_id($action['reservation_id']);
            }
        } catch (\Throwable $e) {
            error_log('Google Calendar sync [' . $action['action'] . ' #' . $action['reservation_id'] . ']: ' . $e->getMessage());
        }
    }

    return new WP_REST_Response(['status' => 'ok'], 200);
}