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.deploy/artwork-evolution-release/app/Services/Messaging/ConversationStateService.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Services\Messaging;
+
+use App\Models\Conversation;
+use App\Models\ConversationParticipant;
+use Illuminate\Support\Facades\Cache;
+
+class ConversationStateService
+{
+    public function activeParticipantIds(Conversation|int $conversation): array
+    {
+        $conversationId = $conversation instanceof Conversation ? $conversation->id : $conversation;
+
+        return ConversationParticipant::query()
+            ->where('conversation_id', $conversationId)
+            ->whereNull('left_at')
+            ->pluck('user_id')
+            ->map(fn ($id) => (int) $id)
+            ->all();
+    }
+
+    public function touchConversationCachesForUsers(array $userIds): void
+    {
+        foreach (array_unique($userIds) as $userId) {
+            if (! $userId) {
+                continue;
+            }
+
+            $versionKey = "messages:conversations:version:{$userId}";
+            Cache::add($versionKey, 1, now()->addDay());
+            Cache::increment($versionKey);
+        }
+    }
+}