From ca7e54670de5d631fef6ba2ecbb1b82080351782 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Ca=C5=82ka?=
 <25438601+rafaucau@users.noreply.github.com>
Date: Mon, 18 Nov 2024 13:51:15 +0100
Subject: [PATCH] feat: add support for fof/merge-discussions

---
 composer.json                                 | 14 ++++---
 extend.php                                    |  4 ++
 .../FoF/MergeDiscussionsEventSubscriber.php   | 38 +++++++++++++++++++
 3 files changed, 51 insertions(+), 5 deletions(-)
 create mode 100644 src/Compatibility/FoF/MergeDiscussionsEventSubscriber.php

diff --git a/composer.json b/composer.json
index c670720..ff85384 100644
--- a/composer.json
+++ b/composer.json
@@ -25,14 +25,15 @@
         "php": ">=8.1"
     },
     "require-dev": {
-        "flarum/phpstan": "^1.8",
-        "flarum/tags": "^1.8",
-        "v17development/flarum-blog": "^0.7.7",
+        "clarkwinkelmann/flarum-ext-author-change": "^1.0",
         "flarum/approval": "^1.8",
         "flarum/likes": "^1.8",
+        "flarum/phpstan": "^1.8",
+        "flarum/tags": "^1.8",
         "fof/masquerade": "^2.1",
-        "clarkwinkelmann/flarum-ext-author-change": "^1.0",
-        "sycho/flarum-move-posts": "^0.1.7"
+        "fof/merge-discussions": "^1.4",
+        "sycho/flarum-move-posts": "^0.1.7",
+        "v17development/flarum-blog": "^v0.8.0"
     },
     "suggest": {
         "blomstra/flarum-redis": "This library allows using Redis as cache, session and for the queue. https://github.com/blomstra/flarum-redis#set-up"
@@ -94,5 +95,8 @@
     },
     "scripts-descriptions": {
         "analyse:phpstan": "Run static analysis"
+    },
+    "config": {
+        "sort-packages": true
     }
 }
diff --git a/extend.php b/extend.php
index c99f59c..00c08ea 100644
--- a/extend.php
+++ b/extend.php
@@ -18,6 +18,7 @@
     Flarum\LikesEventSubscriber,
     Flarum\TagsEventSubscriber,
     FoF\MasqueradePurgeCacheMiddleware,
+    FoF\MergeDiscussionsEventSubscriber,
     SychO\MovePostsSubscriber,
     v17development\FlarumBlogEventSubscriber
 };
@@ -97,6 +98,9 @@
         ->whenExtensionEnabled('fof-masquerade', [
             (new Extend\Middleware('api'))->add(MasqueradePurgeCacheMiddleware::class),
         ])
+        ->whenExtensionEnabled('fof-merge-discussions', [
+            (new Extend\Event)->subscribe(MergeDiscussionsEventSubscriber::class),
+        ])
         ->whenExtensionEnabled('v17development-blog', [
             (new Extend\Event)->subscribe(FlarumBlogEventSubscriber::class),
         ])
diff --git a/src/Compatibility/FoF/MergeDiscussionsEventSubscriber.php b/src/Compatibility/FoF/MergeDiscussionsEventSubscriber.php
new file mode 100644
index 0000000..a01e0ad
--- /dev/null
+++ b/src/Compatibility/FoF/MergeDiscussionsEventSubscriber.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace ACPL\FlarumLSCache\Compatibility\FoF;
+
+use ACPL\FlarumLSCache\Listener\{
+    AbstractCachePurgeSubscriber,
+    DiscussionCachePurgeTrait
+};
+use Flarum\Discussion\Discussion;
+use Flarum\Post\Post;
+use FoF\MergeDiscussions\Events\DiscussionWasMerged;
+use Illuminate\Contracts\Events\Dispatcher;
+
+class MergeDiscussionsEventSubscriber extends AbstractCachePurgeSubscriber
+{
+    use DiscussionCachePurgeTrait;
+
+    public function subscribe(Dispatcher $events): void
+    {
+        $this->addPurgeListener($events, DiscussionWasMerged::class, [$this, 'handleDiscussionWasMerged']);
+    }
+
+    protected function handleDiscussionWasMerged(DiscussionWasMerged $event): void
+    {
+        $this->handleDiscussionRelatedPurge();
+
+        $discussions = $event->mergedDiscussions;
+        $discussions->each(fn (Discussion $discussion) => $this->purger->addPurgeTag("discussion_$discussion->id"));
+
+        $event->posts->each(function (Post $post) {
+            $this->purger->addPurgeTags([
+                "post_$post->id",
+                "user_$post->user_id",
+                "user_{$post->user->username}",
+            ]);
+        });
+    }
+}