fix supabase storage

lib/core/widgets/image_viewer_widget.dart

@@ -1,22 +1,60 @@
+import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:supabase_flutter/supabase_flutter.dart'; // <--- AGGIUNGI QUESTO
 
 class ImageViewerWidget extends StatelessWidget {
-  final String url;
+  final String? storagePath; // ATTENZIONE: Ora contiene lo storagePath!
+  final Uint8List? bytes;
 
-  const ImageViewerWidget({super.key, required this.url});
+  const ImageViewerWidget({super.key, this.storagePath, this.bytes})
+    : assert(
+        (storagePath != null && storagePath != '') || bytes != null,
+        'Errore: Devi fornire un Path valido o i bytes del file!',
+      );
+
+  // Funzione che chiede le chiavi a Supabase
+  Future<String> _getSignedUrl() async {
+    return await Supabase.instance.client.storage
+        .from('documents')
+        .createSignedUrl(storagePath!, 60); // Link che si autodistrugge in 60s
+  }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
+        backgroundColor: Colors.transparent,
+        elevation: 0,
         leading: IconButton(
-          icon: const Icon(Icons.close),
+          icon: const Icon(Icons.close, color: Colors.black),
           onPressed: () => Navigator.pop(context),
         ),
       ),
       body: InteractiveViewer(
-        // InteractiveViewer dà lo zoom gratis alle immagini!
-        child: Center(child: Image.network(url)),
+        maxScale: 5.0,
+        child: Center(
+          // Se abbiamo i byte, mostriamo subito. Altrimenti usiamo il FutureBuilder!
+          child: bytes != null
+              ? Image.memory(bytes!)
+              : FutureBuilder<String>(
+                  future: _getSignedUrl(),
+                  builder: (context, snapshot) {
+                    if (snapshot.connectionState == ConnectionState.waiting) {
+                      return const CircularProgressIndicator();
+                    }
+                    if (snapshot.hasError) {
+                      return const Text(
+                        "Errore caricamento immagine (Permessi negati?)",
+                        style: TextStyle(color: Colors.red),
+                      );
+                    }
+                    if (snapshot.hasData) {
+                      return Image.network(snapshot.data!);
+                    }
+                    return const SizedBox.shrink();
+                  },
+                ),
+        ),
       ),
     );
   }