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

src/NexusReader.Application/Queries/Graph/GetKnowledgeGraphQuery.cs

@@ -2,4 +2,6 @@ using NexusReader.Application.Abstractions.Messaging;
 
 namespace NexusReader.Application.Queries.Graph;
 
-public record GetKnowledgeGraphQuery : IQuery<GraphDataDto>;
+/// <param name="Text">Chapter or page content to extract the graph from.</param>
+public record GetKnowledgeGraphQuery(string Text) : IQuery<GraphDataDto>;
+

src/NexusReader.Application/Queries/Graph/GetKnowledgeGraphQueryHandler.cs

@@ -1,15 +1,42 @@
 using FluentResults;
 using NexusReader.Application.Abstractions.Messaging;
+using NexusReader.Application.Abstractions.Services;
 
 namespace NexusReader.Application.Queries.Graph;
 
 internal sealed class GetKnowledgeGraphQueryHandler : IQueryHandler<GetKnowledgeGraphQuery, GraphDataDto>
 {
-    public Task<Result<GraphDataDto>> Handle(GetKnowledgeGraphQuery request, CancellationToken cancellationToken)
-    {
-        var nodes = new List<GraphNodeDto>();
-        var links = new List<GraphLinkDto>();
+    private readonly IKnowledgeService _knowledgeService;
 
-        return Task.FromResult(Result.Ok(new GraphDataDto { Nodes = nodes, Links = links }));
+    public GetKnowledgeGraphQueryHandler(IKnowledgeService knowledgeService)
+    {
+        _knowledgeService = knowledgeService;
+    }
+
+    public async Task<Result<GraphDataDto>> Handle(GetKnowledgeGraphQuery request, CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(request.Text))
+            return Result.Ok(new GraphDataDto());
+
+        var result = await _knowledgeService.GetGraphDataAsync(request.Text, cancellationToken);
+
+        if (result.IsFailed)
+            return Result.Fail<GraphDataDto>(result.Errors);
+
+        var graph = result.Value.Graph;
+
+        if (graph is null)
+            return Result.Ok(new GraphDataDto());
+
+        var nodes = graph.Nodes
+            .Select(n => new GraphNodeDto(n.Id, n.Label, n.Group))
+            .ToList();
+
+        var links = graph.Links
+            .Select(l => new GraphLinkDto(l.Source, l.Target, l.Value))
+            .ToList();
+
+        return Result.Ok(new GraphDataDto { Nodes = nodes, Links = links });
     }
 }
+