(#3) - templating

includes/Services/Forms/RsvFormHtmlRenderer.php

@@ -1,5 +1,6 @@
 <?php
 
+use Reservair\Templating\RsvTemplateEngine;
 
 class RsvFormHtmlRenderer {
     public function draw(RsvFormDefinition $form): bool {
@@ -20,12 +21,37 @@ class RsvFormHtmlRenderer {
         <?php endforeach; ?>
 
         </form>
+        <?php $this->draw_success_template($form); ?>
         </div>
         <?php
 
         return true;
     }
 
+    /**
+     * Emits the admin-configured success message as an inert <template> that the
+     * client clones once the form is submitted. A <reservation-summary> element
+     * expands to a placeholder div that RsvFormSender fills with the visitor's
+     * selected slots.
+     */
+    private function draw_success_template(RsvFormDefinition $form): void {
+        $message = trim($form->getSuccessMessage());
+        if ($message === '') {
+            return;
+        }
+
+        global $rsv_template_registry;
+        $engine = new RsvTemplateEngine(registry: $rsv_template_registry);
+
+        // Sanitize admin HTML before rendering, allowing the registered template
+        // custom elements through so the engine can expand them.
+        $allowed = $rsv_template_registry->kses_allowed(wp_kses_allowed_html('post'));
+        $html    = $engine->render(wp_kses($message, $allowed));
+        ?>
+        <template class="rsv-form-success"><?= $html ?></template>
+        <?php
+    }
+
     public function draw_element(RsvFormElementDefinition $data): void {
         global $rsv_form_registry;