Add download notifications, improve cleanup

StabilityMatrix.Avalonia/ViewModels/ProgressManagerViewModel.cs

@@ -3,8 +3,10 @@ using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
 using Avalonia.Collections;
+using Avalonia.Controls.Notifications;
 using CommunityToolkit.Mvvm.ComponentModel;
 using FluentAvalonia.UI.Controls;
+using Polly;
 using StabilityMatrix.Avalonia.Models;
 using StabilityMatrix.Avalonia.Services;
 using StabilityMatrix.Avalonia.ViewModels.Base;
@@ -22,13 +24,19 @@ namespace StabilityMatrix.Avalonia.ViewModels;
 [View(typeof(ProgressManagerPage))]
 public partial class ProgressManagerViewModel : PageViewModelBase
 {
+    private readonly INotificationService notificationService;
+    
     public override string Title => "Download Manager";
     public override IconSource IconSource => new SymbolIconSource {Symbol = Symbol.ArrowCircleDown, IsFilled = true};
 
     public AvaloniaList<ProgressItemViewModelBase> ProgressItems { get; } = new();
 
-    public ProgressManagerViewModel(ITrackedDownloadService trackedDownloadService)
+    public ProgressManagerViewModel(
+        ITrackedDownloadService trackedDownloadService,
+        INotificationService notificationService)
     {
+        this.notificationService = notificationService;
+        
         // Attach to the event
         trackedDownloadService.DownloadAdded += TrackedDownloadService_OnDownloadAdded;
     }
@@ -36,6 +44,31 @@ public partial class ProgressManagerViewModel : PageViewModelBase
     private void TrackedDownloadService_OnDownloadAdded(object? sender, TrackedDownload e)
     {
         var vm = new DownloadProgressItemViewModel(e);
+        
+        // Attach notification handlers
+        e.ProgressStateChanged += (s, state) =>
+        {
+            var download = s as TrackedDownload;
+            
+            switch (state)
+            {
+                case ProgressState.Success:
+                    notificationService.Show("Download Completed", $"Download of {e.FileName} completed successfully.", NotificationType.Success);
+                    break;
+                case ProgressState.Failed:
+                    var msg = "";
+                    if (download?.Exception is { } exception)
+                    {
+                        msg = $"({exception.GetType().Name}) {exception.Message}";
+                    }
+                    notificationService.ShowPersistent("Download Failed", $"Download of {e.FileName} failed: {msg}", NotificationType.Error);
+                    break;
+                case ProgressState.Cancelled:
+                    notificationService.Show("Download Cancelled", $"Download of {e.FileName} was cancelled.", NotificationType.Warning);
+                    break;
+            }
+        };
+        
         ProgressItems.Add(vm);
     }
 
@@ -52,6 +85,11 @@ public partial class ProgressManagerViewModel : PageViewModelBase
         }
     }
     
+    private void ShowFailedNotification(string title, string message)
+    {
+        notificationService.ShowPersistent(title, message, NotificationType.Error);
+    }
+    
     public void StartEventListener()
     {
         EventManager.Instance.ProgressChanged += OnProgressChanged;

StabilityMatrix.Core/Models/TrackedDownload.cs

@@ -48,8 +48,11 @@ public class TrackedDownload
     
     public bool ValidateHash { get; init; }
 
+    [JsonConverter(typeof(JsonStringEnumConverter))]
     public ProgressState ProgressState { get; set; } = ProgressState.Inactive;
 
+    public List<string> ExtraCleanupFileNames { get; init; } = new();
+    
     // Used for restoring progress on load
     public long DownloadedBytes { get; set; }
     public long TotalBytes { get; set; }
@@ -207,17 +210,37 @@ public class TrackedDownload
         // Otherwise handle it manually
         else
         {
-            // Delete the temp file
+            DoCleanup();
+            
+            ProgressState = ProgressState.Cancelled;
+            OnProgressStateChanged(ProgressState);
+        }
+    }
+
+    /// <summary>
+    /// Deletes the temp file and any extra cleanup files
+    /// </summary>
+    private void DoCleanup()
+    {
         try
         {
             DownloadDirectory.JoinFile(TempFileName).Delete();
         }
         catch (IOException)
         {
+            Logger.Warn("Failed to delete temp file {TempFile}", TempFileName);
         }
         
-            ProgressState = ProgressState.Cancelled;
-            OnProgressStateChanged(ProgressState);
+        foreach (var extraFile in ExtraCleanupFileNames)
+        {
+            try
+            {
+                DownloadDirectory.JoinFile(extraFile).Delete();
+            }
+            catch (IOException)
+            {
+                Logger.Warn("Failed to delete extra cleanup file {ExtraFile}", extraFile);
+            }
         }
     }
     
@@ -258,17 +281,10 @@ public class TrackedDownload
             ProgressState = ProgressState.Success;
         }
 
-        // For failed or cancelled, delete the temp file
+        // For failed or cancelled, delete the temp files
         if (ProgressState is ProgressState.Failed or ProgressState.Cancelled)
         {
-            // Delete the temp file
-            try
-            {
-                DownloadDirectory.JoinFile(TempFileName).Delete();
-            }
-            catch (IOException)
-            {
-            }
+            DoCleanup();
         } 
         else if (ProgressState == ProgressState.Success)
         {