Completata gestione allegati e riepilogo commessa

salesbook.Maui/Core/Services/AttachedService.cs

@@ -57,9 +57,53 @@ public class AttachedService : IAttachedService
             Name = file.FileName,
             Path = file.FullPath,
             MimeType = file.ContentType,
-            DimensionBytes= ms.Length,
-            FileContent = ms.ToArray(),
+            DimensionBytes = ms.Length,
+            FileBytes = ms.ToArray(),
             Type = type
         };
     }
+
+    private static async Task<string?> SaveToTempStorage(Stream file, string fileName)
+    {
+        var cacheDirectory = FileSystem.CacheDirectory;
+        var targetDirectory = Path.Combine(cacheDirectory, "file");
+
+        if (!Directory.Exists(targetDirectory)) Directory.CreateDirectory(targetDirectory);
+
+        var tempFilePath = Path.Combine(targetDirectory, fileName + ".temp");
+        var filePath = Path.Combine(targetDirectory, fileName);
+
+        if (File.Exists(filePath)) return filePath;
+
+        try
+        {
+            await using var fileStream =
+                new FileStream(tempFilePath, FileMode.Create, FileAccess.Write, FileShare.None);
+            await file.CopyToAsync(fileStream);
+
+            File.Move(tempFilePath, filePath);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine($"Errore durante il salvataggio dello stream: {e.Message}");
+            return null;
+        }
+        finally
+        {
+            if (File.Exists(tempFilePath)) File.Delete(tempFilePath);
+        }
+
+        return filePath;
+    }
+
+    public async Task OpenFile(Stream file, string fileName)
+    {
+        var filePath = await SaveToTempStorage(file, fileName);
+        
+        if (filePath is null) return;
+        await Launcher.OpenAsync(new OpenFileRequest
+        {
+            File = new ReadOnlyFile(filePath)
+        });
+    }
 }