Add message handling for public view creation

Introduce `PostPublicViewMessage` and `PostPublicViewMessageHandler` to handle external user views on public links by applying workflow transitions. Integrate with `WorkflowViewSendPublicController` and add relevant tests.

src/Bundle/ChillMainBundle/Workflow/Messenger/PostPublicViewMessage.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Workflow\Messenger;
+
+/**
+ * Message sent after a EntityWorkflowSendView was created, which means that
+ * an external user has seen a link for a public view.
+ */
+class PostPublicViewMessage
+{
+    public function __construct(
+        public int $entityWorkflowSendViewId,
+    ) {}
+}

src/Bundle/ChillMainBundle/Workflow/Messenger/PostPublicViewMessageHandler.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Workflow\Messenger;
+
+use Chill\MainBundle\Repository\EntityWorkflowSendViewRepository;
+use Chill\MainBundle\Workflow\WorkflowTransitionContextDTO;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Messenger\Handler\MessageHandlerInterface;
+use Symfony\Component\Workflow\Registry;
+
+/**
+ * Handle the behaviour after a EntityWorkflowSentView was created.
+ *
+ * This handler apply a transition if the workflow's configuration defines one.
+ */
+final readonly class PostPublicViewMessageHandler implements MessageHandlerInterface
+{
+    private const LOG_PREFIX = '[PostPublicViewMessageHandler] ';
+
+    private const TRANSITION_ON_VIEW = 'onExternalView';
+
+    public function __construct(
+        private EntityWorkflowSendViewRepository $sendViewRepository,
+        private Registry $registry,
+        private LoggerInterface $logger,
+    ) {}
+
+    public function __invoke(PostPublicViewMessage $message): void
+    {
+        $view = $this->sendViewRepository->find($message->entityWorkflowSendViewId);
+
+        if (null === $view) {
+            throw new \RuntimeException("EntityworkflowSendViewId {$message->entityWorkflowSendViewId} not found");
+        }
+
+        $step = $view->getSend()->getEntityWorkflowStep();
+        $entityWorkflow = $step->getEntityWorkflow();
+
+        if ($step !== $entityWorkflow->getCurrentStep()) {
+            $this->logger->info(self::LOG_PREFIX."Do not handle view, as the current's step for the associated EntityWorkflow has already moved", [
+                'id' => $message->entityWorkflowSendViewId,
+                'entityWorkflow' => $entityWorkflow->getId(),
+            ]);
+
+            return;
+        }
+
+        $workflow = $this->registry->get($entityWorkflow, $entityWorkflow->getWorkflowName());
+        $metadata = $workflow->getMetadataStore();
+
+        foreach ($workflow->getMarking($entityWorkflow)->getPlaces() as $place => $key) {
+            $placeMetadata = $metadata->getPlaceMetadata($place);
+            if (array_key_exists(self::TRANSITION_ON_VIEW, $placeMetadata)) {
+                if ($workflow->can($entityWorkflow, $placeMetadata[self::TRANSITION_ON_VIEW])) {
+                    $dto = new WorkflowTransitionContextDTO($entityWorkflow);
+                    $dto->transition = $workflow->getEnabledTransition($entityWorkflow, $placeMetadata[self::TRANSITION_ON_VIEW]);
+
+                    $workflow->apply($entityWorkflow, $placeMetadata[self::TRANSITION_ON_VIEW], [
+                        'context' => $dto,
+                        'transitionAt' => $view->getViewAt(),
+                        'transition' => $placeMetadata[self::TRANSITION_ON_VIEW],
+                    ]);
+
+                    return;
+                }
+                $this->logger->info(self::LOG_PREFIX.'Not able to apply this transition', ['transition' => $placeMetadata[self::TRANSITION_ON_VIEW],
+                    'entityWorkflowId' => $entityWorkflow->getId(), 'viewId' => $view->getId()]);
+
+            }
+        }
+    }
+}