feat(admin): add MP3 validation with detailed audio info and cover detection

app/admin/page.tsx

@@ -84,7 +84,25 @@ export default function AdminPage() {
         });
 
         if (res.ok) {
-            setMessage('Song uploaded successfully!');
+            const data = await res.json();
+            const validation = data.validation;
+
+            let statusMessage = '✅ Song uploaded successfully!\n\n';
+            statusMessage += `📊 Audio Info:\n`;
+            statusMessage += `• Format: ${validation.codec || 'unknown'}\n`;
+            statusMessage += `• Bitrate: ${Math.round(validation.bitrate / 1000)} kbps\n`;
+            statusMessage += `• Sample Rate: ${validation.sampleRate} Hz\n`;
+            statusMessage += `• Duration: ${Math.round(validation.duration)} seconds\n`;
+            statusMessage += `• Cover Art: ${validation.hasCover ? '✅ Yes' : '❌ No'}\n`;
+
+            if (validation.warnings.length > 0) {
+                statusMessage += `\n⚠️ Warnings:\n`;
+                validation.warnings.forEach((warning: string) => {
+                    statusMessage += `• ${warning}\n`;
+                });
+            }
+
+            setMessage(statusMessage);
             setFile(null);
             fetchSongs();
         } else {
@@ -247,7 +265,20 @@ export default function AdminPage() {
                     <button type="submit" className="btn-primary">
                         Upload Song
                     </button>
-                    {message && <p style={{ textAlign: 'center', marginTop: '0.5rem' }}>{message}</p>}
+                    {message && (
+                        <div style={{
+                            marginTop: '1rem',
+                            padding: '1rem',
+                            background: message.includes('⚠️') ? '#fff3cd' : '#d4edda',
+                            border: `1px solid ${message.includes('⚠️') ? '#ffc107' : '#28a745'}`,
+                            borderRadius: '0.25rem',
+                            whiteSpace: 'pre-line',
+                            fontSize: '0.875rem',
+                            fontFamily: 'monospace'
+                        }}>
+                            {message}
+                        </div>
+                    )}
                 </form>
             </div>
 

app/api/songs/route.ts

@@ -41,17 +41,62 @@ export async function POST(request: Request) {
 
         const buffer = Buffer.from(await file.arrayBuffer());
 
-        // Extract metadata from file
+        // Validate and extract metadata from file
+        let metadata;
+        let validationInfo = {
+            isValid: true,
+            hasCover: false,
+            format: '',
+            bitrate: 0,
+            sampleRate: 0,
+            duration: 0,
+            codec: '',
+            warnings: [] as string[],
+        };
+
         try {
-            const metadata = await parseBuffer(buffer, file.type);
+            metadata = await parseBuffer(buffer, file.type);
+
+            // Extract basic metadata
             if (metadata.common.title) {
                 title = metadata.common.title;
             }
             if (metadata.common.artist) {
                 artist = metadata.common.artist;
             }
+
+            // Validation info
+            validationInfo.hasCover = !!metadata.common.picture?.[0];
+            validationInfo.format = metadata.format.container || 'unknown';
+            validationInfo.bitrate = metadata.format.bitrate || 0;
+            validationInfo.sampleRate = metadata.format.sampleRate || 0;
+            validationInfo.duration = metadata.format.duration || 0;
+            validationInfo.codec = metadata.format.codec || 'unknown';
+
+            // Validate format
+            if (metadata.format.container !== 'MPEG') {
+                validationInfo.warnings.push('File may not be a standard MP3 (MPEG container expected)');
+            }
+
+            // Check bitrate
+            if (validationInfo.bitrate && validationInfo.bitrate < 96000) {
+                validationInfo.warnings.push(`Low bitrate detected: ${Math.round(validationInfo.bitrate / 1000)} kbps`);
+            }
+
+            // Check sample rate
+            if (validationInfo.sampleRate && ![44100, 48000].includes(validationInfo.sampleRate)) {
+                validationInfo.warnings.push(`Non-standard sample rate: ${validationInfo.sampleRate} Hz (recommended: 44100 or 48000 Hz)`);
+            }
+
+            // Check duration
+            if (!validationInfo.duration || validationInfo.duration < 30) {
+                validationInfo.warnings.push('Audio file is very short (less than 30 seconds)');
+            }
+
         } catch (e) {
             console.error('Failed to parse metadata:', e);
+            validationInfo.isValid = false;
+            validationInfo.warnings.push('Failed to parse audio metadata - file may be corrupted');
         }
 
         // Fallback if still missing
@@ -66,8 +111,7 @@ export async function POST(request: Request) {
         // Handle cover image
         let coverImage = null;
         try {
-            const metadata = await parseBuffer(buffer, file.type);
-            const picture = metadata.common.picture?.[0];
+            const picture = metadata?.common.picture?.[0];
 
             if (picture) {
                 const extension = picture.format.split('/')[1] || 'jpg';
@@ -90,7 +134,10 @@ export async function POST(request: Request) {
             },
         });
 
-        return NextResponse.json(song);
+        return NextResponse.json({
+            song,
+            validation: validationInfo,
+        });
     } catch (error) {
         console.error('Error uploading song:', error);
         return NextResponse.json({ error: 'Internal Server Error' }, { status: 500 });