Batch-load comment reaction counts on artwork comments.

Avoid per-comment reaction queries on the deferred comments API by aggregating counts in one service call.

app/Http/Controllers/Api/ArtworkCommentController.php

@@ -11,6 +11,7 @@ use App\Models\UserMention;
 use App\Notifications\ArtworkCommentedNotification;
 use App\Notifications\ArtworkMentionedNotification;
 use App\Services\ContentSanitizer;
+use App\Services\CommentReactionService;
 use App\Support\AvatarUrl;
 use Carbon\Carbon;
 use Illuminate\Http\JsonResponse;
@@ -30,6 +31,8 @@ class ArtworkCommentController extends Controller
 {
     private const MAX_LENGTH = 10_000;
 
+    public function __construct(private readonly CommentReactionService $commentReactions) {}
+
     // ─────────────────────────────────────────────────────────────────────────
     // List
     // ─────────────────────────────────────────────────────────────────────────
@@ -53,7 +56,9 @@ class ArtworkCommentController extends Controller
             ->paginate($perPage, ['*'], 'page', $page);
 
         $userId = $request->user()?->id;
-        $items  = $comments->getCollection()->map(fn ($c) => $this->formatComment($c, $userId, true));
+        $commentIds = $this->commentIds($comments->getCollection());
+        $reactionTotals = $this->commentReactions->forComments($commentIds, $userId);
+        $items  = $comments->getCollection()->map(fn ($c) => $this->formatComment($c, $userId, true, $reactionTotals));
 
         return response()->json([
             'data' => $items,
@@ -138,7 +143,9 @@ class ArtworkCommentController extends Controller
             );
         } catch (\Throwable) {}
 
-        return response()->json(['data' => $this->formatComment($comment, $request->user()->id, false)], 201);
+        $reactionTotals = $this->commentReactions->forComments([$comment->id], $request->user()->id);
+
+        return response()->json(['data' => $this->formatComment($comment, $request->user()->id, false, $reactionTotals)], 201);
     }
 
     // ─────────────────────────────────────────────────────────────────────────
@@ -197,7 +204,7 @@ class ArtworkCommentController extends Controller
     // Helpers
     // ─────────────────────────────────────────────────────────────────────────
 
-    private function formatComment(ArtworkComment $c, ?int $currentUserId, bool $includeReplies = false): array
+    private function formatComment(ArtworkComment $c, ?int $currentUserId, bool $includeReplies = false, array $reactionTotals = []): array
     {
         $user     = $c->user;
         $userId   = (int) ($c->user_id ?? 0);
@@ -221,12 +228,13 @@ class ArtworkCommentController extends Controller
                 'level'       => (int) ($user?->level ?? 1),
                 'rank'        => (string) ($user?->rank ?? 'Newbie'),
             ],
+            'reactions' => $reactionTotals[(int) $c->id] ?? [],
         ];
 
         if ($includeReplies && $c->relationLoaded('approvedReplies')) {
-            $data['replies'] = $c->approvedReplies->map(fn ($r) => $this->formatComment($r, $currentUserId, true))->values()->toArray();
+            $data['replies'] = $c->approvedReplies->map(fn ($r) => $this->formatComment($r, $currentUserId, true, $reactionTotals))->values()->toArray();
         } elseif ($includeReplies && $c->relationLoaded('replies')) {
-            $data['replies'] = $c->replies->map(fn ($r) => $this->formatComment($r, $currentUserId, true))->values()->toArray();
+            $data['replies'] = $c->replies->map(fn ($r) => $this->formatComment($r, $currentUserId, true, $reactionTotals))->values()->toArray();
         } else {
             $data['replies'] = [];
         }
@@ -234,6 +242,24 @@ class ArtworkCommentController extends Controller
         return $data;
     }
 
+    /** @param iterable<int, ArtworkComment> $comments */
+    private function commentIds(iterable $comments): array
+    {
+        $ids = [];
+        $walk = function (iterable $items) use (&$walk, &$ids): void {
+            foreach ($items as $comment) {
+                $ids[] = (int) $comment->id;
+                if ($comment->relationLoaded('approvedReplies')) {
+                    $walk($comment->approvedReplies);
+                }
+            }
+        };
+
+        $walk($comments);
+
+        return array_values(array_unique($ids));
+    }
+
     private function renderCommentContent(ArtworkComment $comment): string
     {
         $rawContent = (string) ($comment->raw_content ?? $comment->content ?? '');

app/Services/CommentReactionService.php

@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Enums\ReactionType;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Bulk reaction read model for artwork comment trees.
+ *
+ * The returned value intentionally matches ReactionController's `totals`
+ * contract so SSR and API comment payloads can hydrate ReactionBar directly.
+ */
+final class CommentReactionService
+{
+    /**
+     * @param  iterable<int|string>  $commentIds
+     * @return array<int, array<string, array{emoji:string, label:string, count:int, mine:bool}>>
+     */
+    public function forComments(iterable $commentIds, ?int $userId = null): array
+    {
+        $ids = collect($commentIds)
+            ->map(static fn ($id): int => (int) $id)
+            ->filter(static fn (int $id): bool => $id > 0)
+            ->unique()
+            ->values()
+            ->all();
+
+        if ($ids === []) {
+            return [];
+        }
+
+        $counts = DB::table('comment_reactions')
+            ->whereIn('comment_id', $ids)
+            ->selectRaw('comment_id, reaction, COUNT(*) as total')
+            ->groupBy('comment_id', 'reaction')
+            ->get()
+            ->groupBy('comment_id');
+
+        $mine = collect();
+        if ($userId !== null) {
+            $mine = DB::table('comment_reactions')
+                ->whereIn('comment_id', $ids)
+                ->where('user_id', $userId)
+                ->get(['comment_id', 'reaction'])
+                ->groupBy('comment_id');
+        }
+
+        $result = [];
+        foreach ($ids as $commentId) {
+            $commentCounts = $counts->get($commentId, collect())->keyBy('reaction');
+            $commentMine = $mine->get($commentId, collect())->pluck('reaction')->flip();
+
+            $totals = [];
+            foreach (ReactionType::cases() as $type) {
+                $slug = $type->value;
+                $totals[$slug] = [
+                    'emoji' => $type->emoji(),
+                    'label' => $type->label(),
+                    'count' => (int) ($commentCounts->get($slug)->total ?? 0),
+                    'mine' => $commentMine->has($slug),
+                ];
+            }
+
+            $result[$commentId] = $totals;
+        }
+
+        return $result;
+    }
+}