old-new-wiaas/backend/app/plugins/wiaas/includes/admin/delivery-process/class-wiaas-admin-delivery-process-flow.php

<?php

class Wiaas_Admin_Order_Process_Flow {

	public static function init() {

		add_action( 'admin_menu', array(__CLASS__, 'add_delivery_process_page') );

		add_action( 'gravityflow_entry_detail', array( __CLASS__, 'display_process_steps_details' ), 10, 3 );
	}

	public static function add_delivery_process_page() {
		add_submenu_page(
			'edit.php?post_type=shop_order',
			__( 'Order Delivery', 'wiaas' ),
			null,
			'read',
			'wiaas-order-delivery',
			array(__CLASS__, 'output_delivery_process')
		);
    }

    public static function output_delivery_process() {
	    $order_id = absint( $_GET['id'] );

	    $has_access = Wiaas_Access_Management::can_current_user_read_order($order_id);

	    if (! $has_access) {

		    echo "<h2>You don't have permission to view this order.</h2>";

		    return;
	    }

	    $order = wc_get_order($order_id);

	    if ( !$order ) {
	        return;
        }

	    $delivery_process = Wiaas_Delivery_Process::get_order_delivery_process_entry($order->get_id());

	    if ($delivery_process &&
            wp_verify_nonce($_POST['wiaas_delivery_process_navigation_nonce'], 'wiaas_delivery_process_navigation') &&
            GFAPI::current_user_can_any( 'manage_wiaas_order_delivery_process' )) {

	        self::_maybe_process_admin_step_change_action($delivery_process);

	        // refresh order
            $order = wc_get_order($order_id);
        }

        require 'views/html-admin-delivery-process-page.php';
    }

	private static function _maybe_process_admin_step_change_action($entry) {

		$admin_action = rgpost( 'wiaas_delivery_process_navigation_action' );

		if ($admin_action === 'complete') {

			$api = new Gravity_Flow_API( $entry['form_id'] );

			$current_step = $api->get_current_step($entry);

			if ( $current_step ) {
				$current_step->purge_assignees();
				$current_step->update_step_status( 'complete' );
			}

			$api->process_workflow($entry['id']);
        }

		list( $base_admin_action, $action_id ) = rgexplode( '|', $admin_action, 2 );

		if ( $base_admin_action == 'send_to_step' ) {
			$step_id = $action_id;
			$api = new Gravity_Flow_API( $entry['form_id'] );
			$api->send_to_step( $entry, $step_id );
		}
	}

}

Wiaas_Admin_Order_Process_Flow::init();