feat: implement AI-driven text streaming and dynamic knowledge graph generation in AiAssistantBubble

src/NexusReader.UI.Shared/Components/Molecules/AiAssistantBubble.razor

@@ -1,36 +1,126 @@
 @using NexusReader.UI.Shared.Services
+@using NexusReader.Application.DTOs.AI
 @inject IQuizStateService QuizState
+@inject KnowledgeCoordinator Coordinator
+@implements IDisposable
 
 <div class="ai-bubble-container">
     <div class="ai-bubble">
         <div class="ai-avatar">
             <div class="avatar-ring"></div>
-            <NexusIcon Name="robot" Size="48" Class="neon-pulse" />
+            <NexusIcon Name="robot" Size="48" Class="@(_isStreaming ? "neon-pulse" : "neon-glow")" />
             <div class="avatar-label">
                 <span class="name">E-Czytnik</span>
                 <span class="role">Asystent AI</span>
             </div>
         </div>
         <div class="ai-content">
-            <NexusTypography Variant="NexusTypography.TypographyVariant.UI">@Dialogue</NexusTypography>
-            
+            @if (_isLoading)
+            {
+                <div class="loading-state">
+                    <div class="shimmer">Analizuję fragment...</div>
+                </div>
+            }
+            else
+            {
+                <NexusTypography Variant="NexusTypography.TypographyVariant.UI">
+                    @_displayedText@(_isStreaming ? "▍" : "")
+                </NexusTypography>
+            }
+
             <div class="ai-actions">
                 <button class="action-btn ghost" @onclick='() => HandleActionClick("more")'>Pokaż więcej informacji</button>
-                <button class="action-btn neon-border" @onclick='() => HandleActionClick("quiz")'>Rozwiąż quiz</button>
+                <button class="action-btn neon-border" @onclick='() => HandleActionClick("quiz")' disabled="@(_isLoading)">Rozwiąż quiz</button>
             </div>
-
         </div>
         <div class="bubble-pointer"></div>
     </div>
 </div>
 
-
 @code {
     [Parameter] public string ContextBlockId { get; set; } = string.Empty;
+    /// <summary>Fallback static dialogue shown when no live AI content is available.</summary>
     [Parameter] public string Dialogue { get; set; } = string.Empty;
     [Parameter] public List<string> Actions { get; set; } = new();
     [Parameter] public EventCallback<string> OnActionTriggered { get; set; }
 
+    private string _displayedText = string.Empty;
+    private bool _isLoading = false;
+    private bool _isStreaming = false;
+    private string _lastFetchedBlockId = string.Empty;
+    private KnowledgePacket? _packet;
+    private CancellationTokenSource? _streamCts;
+
+    protected override async Task OnParametersSetAsync()
+    {
+        // Only re-fetch when the block context actually changes
+        if (string.IsNullOrEmpty(ContextBlockId) || ContextBlockId == _lastFetchedBlockId)
+            return;
+
+        _lastFetchedBlockId = ContextBlockId;
+        await FetchAndStreamAsync();
+    }
+
+    private async Task FetchAndStreamAsync()
+    {
+        // Cancel any in-progress stream
+        _streamCts?.Cancel();
+        _streamCts = new CancellationTokenSource();
+        var token = _streamCts.Token;
+
+        _isLoading = true;
+        _isStreaming = false;
+        _displayedText = string.Empty;
+        _packet = null;
+        StateHasChanged();
+
+        try
+        {
+            _packet = await Coordinator.RequestSummaryAndQuizAsync(
+                $"[ID: {ContextBlockId}]\n{Dialogue}");
+
+            var summary = _packet?.Summary;
+
+            if (string.IsNullOrWhiteSpace(summary))
+            {
+                // Fall back to the static Dialogue parameter
+                _displayedText = string.IsNullOrEmpty(Dialogue)
+                    ? "Brak danych do analizy."
+                    : Dialogue;
+                _isLoading = false;
+                StateHasChanged();
+                return;
+            }
+
+            _isLoading = false;
+            _isStreaming = true;
+
+            // Word-by-word reveal (streaming simulation)
+            var words = summary.Split(' ');
+            foreach (var word in words)
+            {
+                if (token.IsCancellationRequested) break;
+                _displayedText += (string.IsNullOrEmpty(_displayedText) ? "" : " ") + word;
+                StateHasChanged();
+                await Task.Delay(40, token); // ~25 words/sec
+            }
+        }
+        catch (OperationCanceledException)
+        {
+            // Superseded by a newer block — silently drop
+        }
+        catch (Exception ex)
+        {
+            _displayedText = string.IsNullOrEmpty(Dialogue) ? "Błąd analizy." : Dialogue;
+            Console.WriteLine($"[AiAssistantBubble] Error fetching summary: {ex.Message}");
+        }
+        finally
+        {
+            _isStreaming = false;
+            StateHasChanged();
+        }
+    }
+
     private async Task HandleActionClick(string action)
     {
         if (action.Contains("quiz", StringComparison.OrdinalIgnoreCase))
@@ -43,4 +133,10 @@
             await OnActionTriggered.InvokeAsync(action);
         }
     }
+
+    public void Dispose()
+    {
+        _streamCts?.Cancel();
+        _streamCts?.Dispose();
+    }
 }