fix supabase storage

lib/core/widgets/pdf_viewer_widget.dart

@@ -1,11 +1,19 @@
+import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:get_it/get_it.dart';
 import 'package:pdfx/pdfx.dart';
-import 'package:internet_file/internet_file.dart'; // flutter pub add internet_file
+import 'package:internet_file/internet_file.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
 
 class PdfViewerWidget extends StatefulWidget {
-  final String url;
+  final String? storagePath;
+  final Uint8List? bytes;
 
-  const PdfViewerWidget({super.key, required this.url});
+  const PdfViewerWidget({super.key, this.storagePath, this.bytes})
+    : assert(
+        (storagePath != null && storagePath != '') || bytes != null,
+        'Errore: Devi fornire un URL valido o i bytes del file!',
+      );
 
   @override
   State<PdfViewerWidget> createState() => _PdfViewerWidgetState();
@@ -14,6 +22,7 @@ class PdfViewerWidget extends StatefulWidget {
 class _PdfViewerWidgetState extends State<PdfViewerWidget> {
   late PdfControllerPinch _pdfController;
   bool _isLoading = true;
+  String? _errorMessage;
 
   @override
   void initState() {
@@ -22,12 +31,37 @@ class _PdfViewerWidgetState extends State<PdfViewerWidget> {
   }
 
   Future<void> _initPdf() async {
-    // Scarica il file in memoria in modo fluido
-    final pdfData = await InternetFile.get(widget.url);
-    _pdfController = PdfControllerPinch(
-      document: PdfDocument.openData(pdfData),
-    );
-    if (mounted) setState(() => _isLoading = false);
+    try {
+      Uint8List pdfData;
+
+      if (widget.bytes != null) {
+        // SCENARIO 1: Pratica in bozza, file appena scelto (Locale)
+        pdfData = widget.bytes!;
+      } else if (widget.storagePath != null && widget.storagePath!.isNotEmpty) {
+        // SCENARIO 2: Pratica salvata, scarichiamo da Supabase (Remoto)
+        final signedUrl = await GetIt.I
+            .get<SupabaseClient>()
+            .storage
+            .from('documents')
+            .createSignedUrl(widget.storagePath!, 60);
+        pdfData = await InternetFile.get(signedUrl);
+      } else {
+        throw Exception("Nessun documento trovato");
+      }
+
+      _pdfController = PdfControllerPinch(
+        document: PdfDocument.openData(pdfData),
+      );
+
+      if (mounted) setState(() => _isLoading = false);
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _isLoading = false;
+          _errorMessage = e.toString();
+        });
+      }
+    }
   }
 
   @override
@@ -39,21 +73,25 @@ class _PdfViewerWidgetState extends State<PdfViewerWidget> {
   @override
   Widget build(BuildContext context) {
     if (_isLoading) {
-      return const Center(child: CircularProgressIndicator());
+      return const Scaffold(body: Center(child: CircularProgressIndicator()));
     }
+
+    if (_errorMessage != null) {
+      return Scaffold(
+        appBar: AppBar(leading: const CloseButton()),
+        body: Center(child: Text("Errore: $_errorMessage")),
+      );
+    }
+
     return Scaffold(
-      // Usiamo Scaffold dentro il Dialog per avere l'AppBar e poter chiudere
       appBar: AppBar(
-        title: const Text("Visualizzatore PDF"),
+        title: const Text("Anteprima PDF"),
         leading: IconButton(
           icon: const Icon(Icons.close),
           onPressed: () => Navigator.pop(context),
         ),
       ),
-      body: PdfViewPinch(
-        controller: _pdfController,
-        // pdfx gestisce nativamente il pinch to zoom!
-      ),
+      body: PdfViewPinch(controller: _pdfController),
     );
   }
 }