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app/Http/Controllers/RSS/DiscoverFeedController.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\RSS;
+
+use App\Http\Controllers\Controller;
+use App\Models\Artwork;
+use App\Services\RSS\RSSFeedBuilder;
+use Illuminate\Http\Response;
+use Illuminate\Support\Facades\Cache;
+
+/**
+ * DiscoverFeedController
+ *
+ * Powers the /rss/discover/* feeds (spec §3.2).
+ *
+ * GET /rss/discover            → fresh/latest (default)
+ * GET /rss/discover/trending   → trending by trending_score_7d
+ * GET /rss/discover/fresh      → latest published
+ * GET /rss/discover/rising     → rising by heat_score
+ */
+final class DiscoverFeedController extends Controller
+{
+    public function __construct(private readonly RSSFeedBuilder $builder) {}
+
+    /** /rss/discover → redirect to fresh */
+    public function index(): Response
+    {
+        return $this->fresh();
+    }
+
+    /** /rss/discover/trending */
+    public function trending(): Response
+    {
+        $feedUrl  = url('/rss/discover/trending');
+        $artworks = Cache::remember('rss:discover:trending', 600, fn () =>
+            Artwork::public()->published()
+                ->with(['user:id,username', 'categories:id,name,slug,content_type_id'])
+                ->leftJoin('artwork_stats', 'artwork_stats.artwork_id', '=', 'artworks.id')
+                ->orderByDesc('artwork_stats.trending_score_7d')
+                ->orderByDesc('artworks.published_at')
+                ->select('artworks.*')
+                ->limit(RSSFeedBuilder::FEED_LIMIT)
+                ->get()
+        );
+
+        return $this->builder->buildFromArtworks(
+            'Trending Artworks',
+            'The most-viewed and trending artworks on Skinbase over the past 7 days.',
+            $feedUrl,
+            $artworks,
+        );
+    }
+
+    /** /rss/discover/fresh */
+    public function fresh(): Response
+    {
+        $feedUrl  = url('/rss/discover/fresh');
+        $artworks = Cache::remember('rss:discover:fresh', 300, fn () =>
+            Artwork::public()->published()
+                ->with(['user:id,username', 'categories:id,name,slug,content_type_id'])
+                ->latest('published_at')
+                ->limit(RSSFeedBuilder::FEED_LIMIT)
+                ->get()
+        );
+
+        return $this->builder->buildFromArtworks(
+            'Fresh Uploads',
+            'The latest artworks just published on Skinbase.',
+            $feedUrl,
+            $artworks,
+        );
+    }
+
+    /** /rss/discover/rising */
+    public function rising(): Response
+    {
+        $feedUrl  = url('/rss/discover/rising');
+        $artworks = Cache::remember('rss:discover:rising', 600, fn () =>
+            Artwork::public()->published()
+                ->with(['user:id,username', 'categories:id,name,slug,content_type_id'])
+                ->leftJoin('artwork_stats', 'artwork_stats.artwork_id', '=', 'artworks.id')
+                ->orderByDesc('artwork_stats.heat_score')
+                ->orderByDesc('artworks.published_at')
+                ->select('artworks.*')
+                ->limit(RSSFeedBuilder::FEED_LIMIT)
+                ->get()
+        );
+
+        return $this->builder->buildFromArtworks(
+            'Rising Artworks',
+            'Fastest-growing artworks gaining momentum on Skinbase right now.',
+            $feedUrl,
+            $artworks,
+        );
+    }
+}