Fix sorting of photos with equal likes so they are properly randomized instead of grouped by ID

src/lib/sorting.ts

@@ -20,31 +20,36 @@ export function getShuffledItemIds(metadata: any[], seed: number) {
     return b.id - a.id; // Fallback to newest first
   });
 
-  // Sort normal items by likes DESC, then newest first
-  normalItems.sort((a, b) => {
-    const likesA = a._count?.likes || 0;
-    const likesB = b._count?.likes || 0;
-    if (likesA !== likesB) return likesB - likesA;
-    return b.id - a.id;
-  });
-
-  // Chunk normal items into 10% blocks
-  const chunkSize = Math.max(1, Math.ceil(normalItems.length * 0.1));
-  const chunks: any[][] = [];
-  for (let i = 0; i < normalItems.length; i += chunkSize) {
-    chunks.push(normalItems.slice(i, i + chunkSize));
+  // Group normal items by number of likes
+  const groupedByLikes = new Map<number, any[]>();
+  for (const item of normalItems) {
+    const likes = item._count?.likes || 0;
+    if (!groupedByLikes.has(likes)) {
+      groupedByLikes.set(likes, []);
+    }
+    groupedByLikes.get(likes)!.push(item);
   }
 
-  // Shuffle each chunk using the seed
+  // Sort the like counts descending
+  const sortedLikeCounts = Array.from(groupedByLikes.keys()).sort((a, b) => b - a);
+  
+  const shuffledNormalItems: any[] = [];
   const prng = mulberry32(seed);
-  chunks.forEach(chunk => {
-    for (let i = chunk.length - 1; i > 0; i--) {
+
+  // For each group of likes, shuffle the items and add to the final list
+  for (const likes of sortedLikeCounts) {
+    const group = groupedByLikes.get(likes)!;
+    
+    // Shuffle the group using the seed
+    for (let i = group.length - 1; i > 0; i--) {
       const j = Math.floor(prng() * (i + 1));
-      [chunk[i], chunk[j]] = [chunk[j], chunk[i]];
+      [group[i], group[j]] = [group[j], group[i]];
+    }
+    
+    shuffledNormalItems.push(...group);
   }
-  });
 
   // Combine and return IDs
-  const combined = [...fixedItems, ...chunks.flat()];
+  const combined = [...fixedItems, ...shuffledNormalItems];
   return combined.map(m => m.id);
 }