Convert Woocommerce Guest to Customer

/**
 * Plugin Name: WooCommerce Convert Guest to Customer
 * Description: Adds a button to convert guest orders to customer accounts on the WooCommerce order details page.
 * Version: 1.0
 * Author: Your Name
 */

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

/**
 * Add "Convert to Customer" button for guest orders
 */
function add_convert_to_customer_button($order) {
    // Check if the order is by a guest user
    if ($order->get_user_id() === 0) {
        $nonce = wp_create_nonce('convert_guest_to_customer');
        $order_id = $order->get_id();
        echo '<button class="button" id="convert-to-customer" data-order-id="' . esc_attr($order_id) . '" data-nonce="' . esc_attr($nonce) . '">Convert to Customer</button>';
    }
}
add_action('woocommerce_admin_order_data_after_billing_address', 'add_convert_to_customer_button', 10, 1);

/**
 * Enqueue JavaScript for AJAX functionality
 */
function enqueue_convert_to_customer_script() {
    wp_enqueue_script('convert-to-customer', plugins_url('convert-to-customer.js', __FILE__), array('jquery'), '1.0', true);
    wp_localize_script('convert-to-customer', 'convert_to_customer_vars', array(
        'ajax_url' => admin_url('admin-ajax.php')
    ));
}
add_action('admin_enqueue_scripts', 'enqueue_convert_to_customer_script');

/**
 * AJAX handler to convert guest to customer
 */
function convert_guest_to_customer() {
    check_ajax_referer('convert_guest_to_customer', 'nonce');

    $order_id = isset($_POST['order_id']) ? intval($_POST['order_id']) : 0;
    $order = wc_get_order($order_id);

    if (!$order) {
        wp_send_json_error('Invalid order ID');
        return;
    }

    $email = $order->get_billing_email();
    $first_name = $order->get_billing_first_name();
    $last_name = $order->get_billing_last_name();

    // Check if user already exists
    $user = get_user_by('email', $email);
    if ($user) {
        wp_send_json_error('User already exists');
        return;
    }

    // Create new user
    $username = sanitize_user(current(explode('@', $email)), true);
    $counter = 1;
    $new_username = $username;
    while (username_exists($new_username)) {
        $new_username = $username . $counter;
        $counter++;
    }

    $password = wp_generate_password();
    $user_id = wp_create_user($new_username, $password, $email);

    if (is_wp_error($user_id)) {
        wp_send_json_error($user_id->get_error_message());
        return;
    }

    // Update user meta
    update_user_meta($user_id, 'first_name', $first_name);
    update_user_meta($user_id, 'last_name', $last_name);

    // Update order with new user ID
    $order->set_customer_id($user_id);
    $order->save();

    // Send email to the new user
    wp_new_user_notification($user_id, null, 'user');

    wp_send_json_success('User created successfully');
}
add_action('wp_ajax_convert_guest_to_customer', 'convert_guest_to_customer');
add_action('wp_ajax_nopriv_convert_guest_to_customer', 'convert_guest_to_customer');

/**
 * Add inline JavaScript
 */
function add_convert_to_customer_inline_script() {
    ?>
    <script type="text/javascript">
    jQuery(document).ready(function($) {
        $('#convert-to-customer').on('click', function(e) {
            e.preventDefault();
            var button = $(this);
            var order_id = button.data('order-id');
            var nonce = button.data('nonce');

            $.ajax({
                url: convert_to_customer_vars.ajax_url,
                type: 'POST',
                data: {
                    action: 'convert_guest_to_customer',
                    order_id: order_id,
                    nonce: nonce
                },
                beforeSend: function() {
                    button.prop('disabled', true).text('Converting...');
                },
                success: function(response) {
                    if (response.success) {
                        alert('Guest converted to customer successfully!');
                        button.remove();
                    } else {
                        alert('Error: ' + response.data);
                    }
                },
                error: function() {
                    alert('An error occurred. Please try again.');
                },
                complete: function() {
                    button.prop('disabled', false).text('Convert to Customer');
                }
            });
        });
    });
    </script>
    <?php
}
add_action('admin_footer', 'add_convert_to_customer_inline_script');

/**
 * @snippet       Register Guest Users @ WooCommerce Checkout
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @testedwith    WooCommerce 8
 * @community     https://businessbloomer.com/club/
 */
 
add_action( 'woocommerce_thankyou', 'bbloomer_register_guests', 9999 );
 
function bbloomer_register_guests( $order_id ) {
   $order = wc_get_order( $order_id );
   $email = $order->get_billing_email();
   if ( ! email_exists( $email ) && ! username_exists( $email ) ) {
      $customer_id = wc_create_new_customer( $email, '', '', array(
         'first_name' => $order->get_billing_first_name(),
         'last_name'  => $order->get_billing_last_name(),
      ));
      if ( is_wp_error( $customer_id ) ) {
         throw new Exception( $customer_id->get_error_message() );
      }
      wc_update_new_customer_past_orders( $customer_id );
      wc_set_customer_auth_cookie( $customer_id );
   } else {
      $user = get_user_by( 'email', $email );
      wc_update_new_customer_past_orders( $user->ID );
   }
}