feat: Add batch genre assignment functionality to song uploads, including UI for selection and post-upload API calls.

app/admin/page.tsx

@@ -106,6 +106,9 @@ export default function AdminPage() {
     const [uploadGenreIds, setUploadGenreIds] = useState<number[]>([]);
     const [uploadExcludeFromGlobal, setUploadExcludeFromGlobal] = useState(false);
 
+    // Batch upload genre selection
+    const [batchUploadGenreIds, setBatchUploadGenreIds] = useState<number[]>([]);
+
     // AI Categorization state
     const [isCategorizing, setIsCategorizing] = useState(false);
     const [categorizationResults, setCategorizationResults] = useState<any>(null);
@@ -548,6 +551,28 @@ export default function AdminPage() {
         setUploadResults(results);
         setFiles([]);
         setIsUploading(false);
+
+        // Assign genres to successfully uploaded songs
+        if (batchUploadGenreIds.length > 0) {
+            const successfulUploads = results.filter(r => r.success && r.song);
+            for (const result of successfulUploads) {
+                try {
+                    await fetch('/api/songs', {
+                        method: 'PUT',
+                        headers: getAuthHeaders(),
+                        body: JSON.stringify({
+                            id: result.song.id,
+                            title: result.song.title,
+                            artist: result.song.artist,
+                            genreIds: batchUploadGenreIds
+                        }),
+                    });
+                } catch (error) {
+                    console.error(`Failed to assign genres to ${result.song.title}:`, error);
+                }
+            }
+        }
+
         fetchSongs();
         fetchGenres();
         fetchSpecials(); // Update special counts
@@ -564,6 +589,13 @@ export default function AdminPage() {
             if (failedCount > 0) {
                 msg += `\n❌ ${failedCount} failed`;
             }
+            if (batchUploadGenreIds.length > 0) {
+                const selectedGenreNames = genres
+                    .filter(g => batchUploadGenreIds.includes(g.id))
+                    .map(g => g.name)
+                    .join(', ');
+                msg += `\n🏷️ Assigned genres: ${selectedGenreNames}`;
+            }
             msg += '\n\n🤖 Starting auto-categorization...';
             setMessage(msg);
             // Small delay to let user see the message
@@ -1219,6 +1251,48 @@ export default function AdminPage() {
                         </div>
                     )}
 
+                    <div style={{ marginBottom: '1rem' }}>
+                        <label style={{ fontWeight: '500', display: 'block', marginBottom: '0.5rem' }}>
+                            Assign Genres (optional)
+                        </label>
+                        <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem' }}>
+                            {genres.map(genre => (
+                                <label
+                                    key={genre.id}
+                                    style={{
+                                        display: 'flex',
+                                        alignItems: 'center',
+                                        gap: '0.25rem',
+                                        padding: '0.25rem 0.5rem',
+                                        background: batchUploadGenreIds.includes(genre.id) ? '#dbeafe' : '#f3f4f6',
+                                        border: batchUploadGenreIds.includes(genre.id) ? '2px solid #3b82f6' : '2px solid transparent',
+                                        borderRadius: '0.25rem',
+                                        cursor: 'pointer',
+                                        fontSize: '0.875rem',
+                                        transition: 'all 0.2s'
+                                    }}
+                                >
+                                    <input
+                                        type="checkbox"
+                                        checked={batchUploadGenreIds.includes(genre.id)}
+                                        onChange={e => {
+                                            if (e.target.checked) {
+                                                setBatchUploadGenreIds([...batchUploadGenreIds, genre.id]);
+                                            } else {
+                                                setBatchUploadGenreIds(batchUploadGenreIds.filter(id => id !== genre.id));
+                                            }
+                                        }}
+                                        style={{ margin: 0 }}
+                                    />
+                                    {genre.name}
+                                </label>
+                            ))}
+                        </div>
+                        <p style={{ fontSize: '0.875rem', color: '#666', marginTop: '0.25rem' }}>
+                            Selected genres will be assigned to all uploaded songs.
+                        </p>
+                    </div>
+
                     <div style={{ marginBottom: '1rem' }}>
                         <label style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', cursor: 'pointer' }}>
                             <input