its 7am i havent slept i have no idea

src/Service/SpotifyClient.php

@@ -119,6 +119,7 @@ class SpotifyClient
         $limit = 50;
         $offset = 0;
         do {
+            // Spotify returns tracks in pages of 50, so iterate until there are no further pages.
             $page = $this->requestAlbumTracksPage($albumId, $accessToken, $limit, $offset);
             if ($page === null) {
                 break;
@@ -156,6 +157,31 @@ class SpotifyClient
         }
     }
 
+    /**
+     * Fetch multiple artists to gather genre information.
+     *
+     * @param list<string> $artistIds
+     * @return array<mixed>|null
+     */
+    public function getArtists(array $artistIds): ?array
+    {
+        if ($artistIds === []) { return []; }
+        $accessToken = $this->getAccessToken();
+        if ($accessToken === null) { return null; }
+
+        $url = 'https://api.spotify.com/v1/artists';
+        $options = [
+            'headers' => [ 'Authorization' => 'Bearer ' . $accessToken ],
+            'query' => [ 'ids' => implode(',', $artistIds) ],
+        ];
+
+        try {
+            return $this->sendRequest('GET', $url, $options, 1800);
+        } catch (\Throwable) {
+            return null;
+        }
+    }
+
     /**
      * Centralized request helper with lightweight caching.
      *
@@ -164,31 +190,26 @@ class SpotifyClient
      */
     private function sendRequest(string $method, string $url, array $options, int $cacheTtlSeconds = 0): array
     {
-        $cacheKey = null;
-        if ($cacheTtlSeconds > 0 && strtoupper($method) === 'GET') {
+        $request = function () use ($method, $url, $options): array {
+            $response = $this->httpClient->request($method, $url, $options);
+            return $response->toArray(false);
+        };
+
+        $shouldCache = $cacheTtlSeconds > 0 && strtoupper($method) === 'GET';
+        if ($shouldCache) {
             $cacheKey = 'spotify_resp_' . sha1($url . '|' . json_encode($options['query'] ?? []));
-            $cached = $this->cache->get($cacheKey, function($item) use ($cacheTtlSeconds) {
-                // placeholder; we'll set item value explicitly below on miss
-                $item->expiresAfter(1);
-                return null;
+            return $this->cache->get($cacheKey, function (ItemInterface $item) use ($cacheTtlSeconds, $request) {
+                $item->expiresAfter($cacheTtlSeconds);
+                return $request();
             });
-            if (is_array($cached) && !empty($cached)) {
-                return $cached;
-            }
         }
 
-        $response = $this->httpClient->request($method, $url, $options);
-        $data = $response->toArray(false);
-        if ($cacheKey && $cacheTtlSeconds > 0 && is_array($data)) {
-            $this->cache->get($cacheKey, function($item) use ($data, $cacheTtlSeconds) {
-                $item->expiresAfter($cacheTtlSeconds);
-                return $data;
-            });
-        }
-        return $data;
+        return $request();
     }
 
     /**
+     * Requests one paginated track list page for an album using the provided OAuth token.
+     *
      * @return array<mixed>|null
      */
     private function requestAlbumTracksPage(string $albumId, string $accessToken, int $limit, int $offset): ?array