Extract new Flarum\Discussion namespace

src/Discussion/DiscussionMetadataUpdater.php

@@ -0,0 +1,104 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Discussion;
+
+use Flarum\Post\Post;
+use Flarum\Post\Event\Deleted;
+use Flarum\Post\Event\Hidden;
+use Flarum\Post\Event\Posted;
+use Flarum\Post\Event\Restored;
+use Illuminate\Contracts\Events\Dispatcher;
+
+class DiscussionMetadataUpdater
+{
+    /**
+     * @param Dispatcher $events
+     */
+    public function subscribe(Dispatcher $events)
+    {
+        $events->listen(Posted::class, [$this, 'whenPostWasPosted']);
+        $events->listen(Deleted::class, [$this, 'whenPostWasDeleted']);
+        $events->listen(Hidden::class, [$this, 'whenPostWasHidden']);
+        $events->listen(Restored::class, [$this, 'whenPostWasRestored']);
+    }
+
+    /**
+     * @param Posted $event
+     */
+    public function whenPostWasPosted(Posted $event)
+    {
+        $discussion = $event->post->discussion;
+
+        if ($discussion && $discussion->exists) {
+            $discussion->refreshCommentsCount();
+            $discussion->refreshLastPost();
+            $discussion->refreshParticipantsCount();
+            $discussion->save();
+        }
+    }
+
+    /**
+     * @param \Flarum\Post\Event\Deleted $event
+     */
+    public function whenPostWasDeleted(Deleted $event)
+    {
+        $this->removePost($event->post);
+
+        $discussion = $event->post->discussion;
+
+        if ($discussion && $discussion->posts()->count() === 0) {
+            $discussion->delete();
+        }
+    }
+
+    /**
+     * @param \Flarum\Post\Event\Hidden $event
+     */
+    public function whenPostWasHidden(Hidden $event)
+    {
+        $this->removePost($event->post);
+    }
+
+    /**
+     * @param Restored $event
+     */
+    public function whenPostWasRestored(Restored $event)
+    {
+        $discussion = $event->post->discussion;
+
+        if ($discussion && $discussion->exists) {
+            $discussion->refreshCommentsCount();
+            $discussion->refreshParticipantsCount();
+            $discussion->refreshLastPost();
+            $discussion->save();
+        }
+    }
+
+    /**
+     * @param Post $post
+     */
+    protected function removePost(Post $post)
+    {
+        $discussion = $post->discussion;
+
+        if ($discussion && $discussion->exists) {
+            $discussion->refreshCommentsCount();
+            $discussion->refreshParticipantsCount();
+
+            if ($discussion->last_post_id == $post->id) {
+                $discussion->refreshLastPost();
+            }
+
+            $discussion->save();
+        }
+    }
+}