Update meeting summary agent UI

MeetingAssistant/Workflow/WorkflowRulesEditorChatViewModel.cs

@@ -1,9 +1,11 @@
 using System.Collections.ObjectModel;
+using System.Diagnostics;
 
 namespace MeetingAssistant.Workflow;
 
 public sealed class WorkflowRulesEditorChatViewModel
 {
+    private const string ThinkingPlaceholder = "Thinking...";
     private readonly IWorkflowRulesEditorChatPipeline pipeline;
 
     public WorkflowRulesEditorChatViewModel(IWorkflowRulesEditorChatPipeline pipeline)
@@ -11,13 +13,15 @@ public sealed class WorkflowRulesEditorChatViewModel
         this.pipeline = pipeline;
     }
 
-    public ObservableCollection<WorkflowRulesEditorChatMessage> Messages { get; } = [];
+    public ObservableCollection<WorkflowRulesEditorConversationItem> Messages { get; } = [];
+
+    public ObservableCollection<string> ActivityMessages { get; } = [];
 
     public string Draft { get; set; } = "";
 
     public bool IsThinking { get; private set; }
 
-    public string ActivityMessage { get; private set; } = "Thinking...";
+    public string ActivityMessage { get; private set; } = ThinkingPlaceholder;
 
     public event EventHandler? Changed;
 
@@ -30,10 +34,19 @@ public sealed class WorkflowRulesEditorChatViewModel
         }
 
         Draft = "";
-        var priorConversation = Messages.ToList();
-        Messages.Add(new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.User, prompt));
+        var startedAt = Stopwatch.GetTimestamp();
+        var activityLines = new List<string>();
+        var hasVisibleThinking = false;
+        var activityContext = SynchronizationContext.Current;
+        var priorConversation = Messages
+            .Select(item => item.Message)
+            .OfType<WorkflowRulesEditorChatMessage>()
+            .ToList();
+        Messages.Add(WorkflowRulesEditorConversationItem.ChatMessage(
+            new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.User, prompt)));
+        ActivityMessages.Clear();
         IsThinking = true;
-        ActivityMessage = "Thinking...";
+        ActivityMessage = ThinkingPlaceholder;
         OnChanged();
 
         try
@@ -42,36 +55,121 @@ public sealed class WorkflowRulesEditorChatViewModel
                 priorConversation,
                 prompt,
                 cancellationToken,
-                SetActivityMessage);
-            Messages.Clear();
-            foreach (var message in result.Conversation)
-            {
-                Messages.Add(message);
-            }
+                update => hasVisibleThinking |= ApplyActivityUpdate(activityContext, update, activityLines));
+            AddCompletedActivity(startedAt, activityLines, hasVisibleThinking);
+            Messages.Add(WorkflowRulesEditorConversationItem.ChatMessage(
+                new WorkflowRulesEditorChatMessage(
+                    WorkflowRulesEditorChatRole.Agent,
+                    string.IsNullOrWhiteSpace(result.Response)
+                        ? "(No response text returned.)"
+                        : result.Response.Trim())));
         }
         catch (Exception exception) when (exception is not OperationCanceledException || !cancellationToken.IsCancellationRequested)
         {
-            Messages.Add(new WorkflowRulesEditorChatMessage(
-                WorkflowRulesEditorChatRole.Agent,
-                $"Settings and logs failed: {exception.Message}"));
+            AddCompletedActivity(startedAt, activityLines, hasVisibleThinking);
+            Messages.Add(WorkflowRulesEditorConversationItem.ChatMessage(
+                new WorkflowRulesEditorChatMessage(
+                    WorkflowRulesEditorChatRole.Agent,
+                    $"Meeting Summary Agent failed: {exception.Message}")));
         }
         finally
         {
             IsThinking = false;
-            ActivityMessage = "Thinking...";
+            ActivityMessages.Clear();
+            ActivityMessage = ThinkingPlaceholder;
             OnChanged();
         }
     }
 
-    private void SetActivityMessage(string message)
+    private bool ApplyActivityUpdate(
+        SynchronizationContext? context,
+        WorkflowRulesEditorActivityUpdate update,
+        List<string> activityLines)
     {
-        if (!IsThinking || string.IsNullOrWhiteSpace(message))
+        if (context is null || SynchronizationContext.Current == context)
         {
-            return;
+            return ApplyActivityUpdate(update, activityLines);
+        }
+
+        var hasVisibleThinking = false;
+        Exception? exception = null;
+        context.Send(
+            _ =>
+            {
+                try
+                {
+                    hasVisibleThinking = ApplyActivityUpdate(update, activityLines);
+                }
+                catch (Exception caught)
+                {
+                    exception = caught;
+                }
+            },
+            null);
+
+        if (exception is not null)
+        {
+            throw exception;
+        }
+
+        return hasVisibleThinking;
+    }
+
+    private bool ApplyActivityUpdate(
+        WorkflowRulesEditorActivityUpdate update,
+        List<string> activityLines)
+    {
+        if (!IsThinking || string.IsNullOrWhiteSpace(update.Text))
+        {
+            return false;
+        }
+
+        var hasVisibleThinking = false;
+        if (update.Kind == WorkflowRulesEditorActivityKind.ToolCall)
+        {
+            var line = $"Called tool: {update.Text.Trim()}";
+            ActivityMessages.Add(line);
+            activityLines.Add(line);
+        }
+        else if (update.Kind == WorkflowRulesEditorActivityKind.Thinking)
+        {
+            var line = update.Text.Trim();
+            ActivityMessages.Add(line);
+            activityLines.Add(line);
+            hasVisibleThinking = true;
+        }
+        else
+        {
+            var line = update.Text.Trim();
+            ActivityMessage = line;
+            activityLines.Add(line);
         }
 
-        ActivityMessage = message;
         OnChanged();
+        return hasVisibleThinking;
+    }
+
+    private void AddCompletedActivity(
+        long startedAt,
+        IReadOnlyList<string> activityLines,
+        bool hasVisibleThinking)
+    {
+        var completedActivityLines = hasVisibleThinking
+            ? activityLines.ToArray()
+            : new[] { ThinkingPlaceholder }.Concat(activityLines).ToArray();
+        Messages.Add(WorkflowRulesEditorConversationItem.Activity(
+            $"Worked for {FormatDuration(Stopwatch.GetElapsedTime(startedAt))}",
+            completedActivityLines));
+    }
+
+    private static string FormatDuration(TimeSpan duration)
+    {
+        if (duration.TotalMinutes >= 1)
+        {
+            return $"{(int)duration.TotalMinutes}m {duration.Seconds}s";
+        }
+
+        return $"{Math.Max(0, (int)Math.Round(duration.TotalSeconds))}s";
     }
 
     private void OnChanged()