better messageing when limits exceeded

reservation.inc

@@ -8,6 +8,7 @@ use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Link;
 use Drupal\Core\Url;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
 
 function reserve_form_reserve_reservation_form_alter(array &$form, FormStateInterface $form_state) {
   // params either passed in on url -  CREATE
@@ -79,33 +80,15 @@ function reserve_form_reserve_reservation_form_alter(array &$form, FormStateInte
     $d = $yyyymmdd . ' 00:00:00';
 
     if (reserve_daily_max_exceeded($yyyymmdd) && !$book_extended) {
-      $form = array();
-      $form['message'] = [
-        '#type' => 'markup',
-        '#weight' => -25,
-        '#markup' => '
-      <div class="messages__wrapper layout-container">
-      <div role="contentinfo" aria-label="Warning message" class="messages messages--warning">' .
-        t('You have exceeded the max number of daily bookings.  Unable to add reservation.') .
-        '</div></div>',
-      ];
-      return;
+      $daily_exceeded_message = t('You have exceeded the max number of daily bookings.  Unable to add reservation.');
+      reserve_set_modal_message($form, $daily_exceeded_message);
     }
     $config = \Drupal::config('reserve.settings');
     $max_per_user = $config->get('reservations_per_user');
     if (count(reserve_user_reservations()) > $max_per_user
       && !$book_extended) {
-      $form = array();
-      $form['message'] = [
-        '#type' => 'markup',
-        '#weight' => -25,
-        '#markup' => '
-      <div class="messages__wrapper layout-container">
-      <div role="contentinfo" aria-label="Warning message" class="messages messages--warning">' .
-        t('You have exceeded your max number of open bookings.  Unable to add reservation.') .
-        '</div></div>',
-      ];
-      return;
+      $max_reservations_exceeded_message =  t('You have exceeded your max number of open bookings.  Unable to add reservation.');
+      reserve_set_modal_message($form,  $max_reservations_exceeded_message);
     }
   }
   $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($eid);
@@ -296,6 +279,21 @@ function reserve_return_to_home_page($form, FormStateInterface $form_state) {
   $form_state->setRedirectUrl($url);
 }
 
+function reserve_set_modal_message(&$form, $message) {
+  $form['message'] = [
+    '#type' => 'markup',
+    '#weight' => -25,
+    '#markup' => '
+      <div class="messages__wrapper layout-container">
+      <div role="contentinfo" aria-label="Warning message" class="messages messages--warning">' .
+      $message .
+      '</div></div>',
+  ];
+  $form['message']['#errors'] = TRUE;
+  $form['actions']['submit']['#attributes']['disabled']  = 'disabled';
+  $form['actions']['submit']['#access'] = FALSE;
+}
+
 /**
  * Custom submit handler for login form.
  */